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University of Colorado
1.
Anderson, Paul V.
Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime.
Degree: PhD, Aerospace Engineering Sciences, 2010, University of Colorado
URL: https://scholar.colorado.edu/asen_gradetds/14 
► The geosynchronous orbit (GEO) is a unique commodity of the satellite industry that is becoming increasingly contaminated with orbital debris, but is heavily populated…
(more)
▼ The geosynchronous
orbit (GEO) is a unique commodity of the satellite industry that is becoming increasingly contaminated with orbital debris, but is heavily populated with high-value assets from the civil, commercial, and defense sectors. The GEO arena is home to hundreds of communications, data transmission, and intelligence satellites collectively insured for an estimated 18.3 billion USD. As the lack of natural cleansing mechanisms at the GEO altitude renders the lifetimes of GEO debris essentially infinite, conjunction and risk assessment must be performed to safeguard operational assets from debris collisions.
In this thesis, longitude-dependent debris congestion is characterized by predicting the number of near-miss events per day for every longitude slot at GEO, using custom debris propagation tools and a torus intersection metric. Near-miss events with the presentday debris population are assigned risk levels based on GEO-relative position and speed, and this risk information is used to prioritize the population for debris removal target selection. Long-term projections of debris growth under nominal launch traffic, mitigation practices, and fragmentation events are also discussed, and latitudinal synchronization of theGEOdebris population is explained via node variations arising from luni-solar gravity.
In addition to characterizing localized debris congestion in the GEO ring, this thesis further investigates the conjunction risk to operational satellites or debris removal systems applying low-thrust propulsion to raise
orbit altitude at end-of-life to a super-synchronous disposal
orbit. Conjunction risks as a function of thrust level, miss distance, longitude, and semi-major axis are evaluated, and a guidance method for evading conjuncting debris with continuous thrust by means of a thrust heading change via single-shooting is developed.
Advisors/Committee Members: Hanspeter Schaub, Brandon Jones, Jeffrey Parker.
Subjects/Keywords: active debris removal; geostationary orbit; geosynchronous orbit; orbital debris; Aerospace Engineering
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APA (6th Edition):
Anderson, P. V. (2010). Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/asen_gradetds/14
Chicago Manual of Style (16th Edition):
Anderson, Paul V. “Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime.” 2010. Doctoral Dissertation, University of Colorado. Accessed January 18, 2021.
https://scholar.colorado.edu/asen_gradetds/14.
MLA Handbook (7th Edition):
Anderson, Paul V. “Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime.” 2010. Web. 18 Jan 2021.
Vancouver:
Anderson PV. Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime. [Internet] [Doctoral dissertation]. University of Colorado; 2010. [cited 2021 Jan 18].
Available from: https://scholar.colorado.edu/asen_gradetds/14.
Council of Science Editors:
Anderson PV. Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime. [Doctoral Dissertation]. University of Colorado; 2010. Available from: https://scholar.colorado.edu/asen_gradetds/14
University of Colorado
2.
Anderson, Paul Vincent.
Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime.
Degree: PhD, Aerospace Engineering Sciences, 2015, University of Colorado
URL: https://scholar.colorado.edu/asen_gradetds/91
► The geosynchronous orbit (GEO) is a unique commodity of the satellite industry that is becoming increasingly contaminated with orbital debris, but is heavily populated…
(more)
▼ The geosynchronous
orbit (GEO) is a unique commodity of the satellite industry that is becoming increasingly contaminated with orbital debris, but is heavily populated with high-value assets from the civil, commercial, and defense sectors. The GEO arena is home to hundreds of communications, data transmission, and intelligence satellites collectively insured for an estimated 18.3 billion USD. As the lack of natural cleansing mechanisms at the GEO altitude renders the lifetimes of GEO debris essentially infinite, conjunction and risk assessment must be performed to safeguard operational assets from debris collisions. In this thesis, longitude-dependent debris congestion is characterized by predicting the number of near-miss events per day for every longitude slot at GEO, using custom debris propagation tools and a torus intersection metric. Near-miss events with the present-day debris population are assigned risk levels based on GEO-relative position and speed, and this risk information is used to prioritize the population for debris removal target selection. Long-term projections of debris growth under nominal launch traffic, mitigation practices, and fragmentation events are also discussed, and latitudinal synchronization of the GEO debris population is explained via node variations arising from luni-solar gravity. In addition to characterizing localized debris congestion in the GEO ring, this thesis further investigates the conjunction risk to operational satellites or debris removal systems applying low-thrust propulsion to raise
orbit altitude at end-of-life to a super-synchronous disposal
orbit. Conjunction risks as a function of thrust level, miss distance, longitude, and semi-major axis are evaluated, and a guidance method for evading conjuncting debris with continuous thrust by means of a thrust heading change via single-shooting is developed.
Advisors/Committee Members: Hanspeter Schaub, Brandon Jones, Jeffrey Parker, Juan Restrepo, Darren McKnight.
Subjects/Keywords: active debris removal; geostationary orbit; geosynchronous orbit; orbital debris; Aerospace Engineering
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APA (6th Edition):
Anderson, P. V. (2015). Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/asen_gradetds/91
Chicago Manual of Style (16th Edition):
Anderson, Paul Vincent. “Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime.” 2015. Doctoral Dissertation, University of Colorado. Accessed January 18, 2021.
https://scholar.colorado.edu/asen_gradetds/91.
MLA Handbook (7th Edition):
Anderson, Paul Vincent. “Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime.” 2015. Web. 18 Jan 2021.
Vancouver:
Anderson PV. Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime. [Internet] [Doctoral dissertation]. University of Colorado; 2015. [cited 2021 Jan 18].
Available from: https://scholar.colorado.edu/asen_gradetds/91.
Council of Science Editors:
Anderson PV. Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime. [Doctoral Dissertation]. University of Colorado; 2015. Available from: https://scholar.colorado.edu/asen_gradetds/91
University of Illinois – Urbana-Champaign
3.
Sears, Patrick.
Impact evaluation of in-space additive manufacturing and recycling technologies for on-orbit servicing.
Degree: MS, Aerospace Engineering, 2018, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/101237
► This thesis proposes an integrated simulation tool to evaluate the impact of future in-space additive manufacturing (ISAM) and recycling technologies on the responsiveness of an…
(more)
▼ This thesis proposes an integrated simulation tool to evaluate the impact of future in-space additive manufacturing (ISAM) and recycling technologies on the responsiveness of an on-
orbit servicing (OOS) infrastructure to random failures of satellites distributed over an
orbit. The considered OOS infrastructure is composed of a mothership and a servicer (i.e., daughtership); the mothership serves as a depot for spares, whereas the servicer travels with the spares to randomly failed satellites and provides a service. All satellites are assumed to be modularized, and thus the service type considered within the infrastructure is the replacement of a failed module with a new spare one. Additionally, an ISAM facility can be added to the mothership, which can scavenge material that makes up the failed module. This obtained feedstock from failed modules, along with raw material supplied from Earth, could be used to manufacture a new spare. The key parameters in this analysis include the technology level of ISAM, in terms of the types of material it can manufacture, and the scavenge rate, defined as the percent of material mass able to be recycled from the failed module to the new module. The two metrics for evaluation are the required resupply launch mass to the mothership and the average waiting time of the satellites before it is serviced. Simulations results showed that the ISAM and recycling technology provides a large impact in terms of both reduction in resupply launch mass and responsiveness of its service to the randomly failed satellites.
Advisors/Committee Members: Ho, Koki (advisor).
Subjects/Keywords: On-Orbit Servicing; Additive Manufacturing; Space Systems; Modularized Satellite; 3D Printing; Simulation; Geostationary orbit
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APA (6th Edition):
Sears, P. (2018). Impact evaluation of in-space additive manufacturing and recycling technologies for on-orbit servicing. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/101237
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sears, Patrick. “Impact evaluation of in-space additive manufacturing and recycling technologies for on-orbit servicing.” 2018. Thesis, University of Illinois – Urbana-Champaign. Accessed January 18, 2021.
http://hdl.handle.net/2142/101237.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sears, Patrick. “Impact evaluation of in-space additive manufacturing and recycling technologies for on-orbit servicing.” 2018. Web. 18 Jan 2021.
Vancouver:
Sears P. Impact evaluation of in-space additive manufacturing and recycling technologies for on-orbit servicing. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2018. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/2142/101237.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sears P. Impact evaluation of in-space additive manufacturing and recycling technologies for on-orbit servicing. [Thesis]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/101237
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Colorado
4.
Jones, Stephanie Leigh.
Negating the Yearly Eccentricity Magnitude Variation of Super-synchronous Disposal Orbits due to Solar Radiation Pressure.
Degree: MS, Aerospace Engineering Sciences, 2013, University of Colorado
URL: https://scholar.colorado.edu/asen_gradetds/60
► Solar radiation pressure alters satellites' eccentricity by accelerating and decelerating them during each orbit. The accumulated perturbation cancels yearly for geostationary satellites, but meanwhile…
(more)
▼ Solar radiation pressure alters satellites' eccentricity by accelerating and decelerating them during each
orbit. The accumulated perturbation cancels yearly for
geostationary satellites, but meanwhile the perigee radius changes. Disposed satellites must be reorbited higher to compensate, using more fuel. The examined disposal
orbit points toward the Sun and uses the satellite's natural eccentricity. This causes the eccentricity vector to only change direction, keeping the perigee radius constant. This thesis verifies this behavior over one year with an analytical derivation and MATLAB simulation, gaining useful insights into its cause. The traditional and proposed disposal orbits are then modeled using NASA's GMAT for more realistic simulations. The proposed
orbit's sensitivity to satellite and initialization errors is also examined. Relationships are developed to show these errors' effect on the perigee radius. In conclusion, while this
orbit can be used in the short term, margins are necessary to guarantee protection of the
geostationary belt.
Advisors/Committee Members: Hanspeter Schaub, Penina Axelrad, Jeffrey Parker.
Subjects/Keywords: disposal orbit; eccentricity; geostationary; orbit perturbation; satellite; solar radiation pressure; Aerospace Engineering; Engineering
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APA (6th Edition):
Jones, S. L. (2013). Negating the Yearly Eccentricity Magnitude Variation of Super-synchronous Disposal Orbits due to Solar Radiation Pressure. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/asen_gradetds/60
Chicago Manual of Style (16th Edition):
Jones, Stephanie Leigh. “Negating the Yearly Eccentricity Magnitude Variation of Super-synchronous Disposal Orbits due to Solar Radiation Pressure.” 2013. Masters Thesis, University of Colorado. Accessed January 18, 2021.
https://scholar.colorado.edu/asen_gradetds/60.
MLA Handbook (7th Edition):
Jones, Stephanie Leigh. “Negating the Yearly Eccentricity Magnitude Variation of Super-synchronous Disposal Orbits due to Solar Radiation Pressure.” 2013. Web. 18 Jan 2021.
Vancouver:
Jones SL. Negating the Yearly Eccentricity Magnitude Variation of Super-synchronous Disposal Orbits due to Solar Radiation Pressure. [Internet] [Masters thesis]. University of Colorado; 2013. [cited 2021 Jan 18].
Available from: https://scholar.colorado.edu/asen_gradetds/60.
Council of Science Editors:
Jones SL. Negating the Yearly Eccentricity Magnitude Variation of Super-synchronous Disposal Orbits due to Solar Radiation Pressure. [Masters Thesis]. University of Colorado; 2013. Available from: https://scholar.colorado.edu/asen_gradetds/60
Virginia Tech
5.
Desai, Karan.
Low-cost Wireless Internet System for Rural India using Geosynchronous Satellite in an Inclined Orbit.
Degree: MS, Electrical and Computer Engineering, 2011, Virginia Tech
URL: http://hdl.handle.net/10919/42495
► Providing affordable Internet access to rural populations in large developing countries to aid economic and social progress, using various non-conventional techniques has been a topic…
(more)
▼ Providing affordable Internet access to rural populations in large developing countries to aid economic and social progress, using various non-conventional techniques has been a topic of active research recently. The main obstacle in providing fiber-optic based terrestrial Internet links to remote villages is the cost involved in laying the cable network and disproportionately low rate of return on investment due to low density of paid users. The conventional alternative to this is providing Internet access using
geostationary satellite links, which can prove commercially infeasible in predominantly cost-driven rural markets in developing economies like India or China due to high access cost per user.
A low-cost derivative of the conventional satellite-based Internet access system can be developed by utilizing an aging
geostationary satellite nearing the end of its active life, allowing it to enter an inclined geosynchronous
orbit by limiting station keeping to only east-west maneuvers to save fuel. Eliminating the need for individual satellite receiver modules by using one centrally located earth station per village and providing last mile connectivity using Wi-Fi can further reduce the access cost per user. A Ku band system design for rural India based on this concept, using an Intelsat 906 satellite is proposed in this thesis. The path of the satellite and the tracking requirements at village stations are determined. Components required for various blocks of the system are defined. Modulation schemes, FEC, data rates, number of customers to be served, link availability and outage statistics are presented. Quantitative analysis using link budgets and ITU rain models are provided. An optimized system design and a commercial deployment model are suggested which show the system is economically feasible.
Advisors/Committee Members: Pratt, Timothy J. (committeechair), Reed, Jeffrey Hugh (committee member), Ruohoniemi, J. Michael (committee member).
Subjects/Keywords: Geostationary Satellite; Wireless; Rural Communication; Inclined Orbit; Low-cost; Internet
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APA (6th Edition):
Desai, K. (2011). Low-cost Wireless Internet System for Rural India using Geosynchronous Satellite in an Inclined Orbit. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/42495
Chicago Manual of Style (16th Edition):
Desai, Karan. “Low-cost Wireless Internet System for Rural India using Geosynchronous Satellite in an Inclined Orbit.” 2011. Masters Thesis, Virginia Tech. Accessed January 18, 2021.
http://hdl.handle.net/10919/42495.
MLA Handbook (7th Edition):
Desai, Karan. “Low-cost Wireless Internet System for Rural India using Geosynchronous Satellite in an Inclined Orbit.” 2011. Web. 18 Jan 2021.
Vancouver:
Desai K. Low-cost Wireless Internet System for Rural India using Geosynchronous Satellite in an Inclined Orbit. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/10919/42495.
Council of Science Editors:
Desai K. Low-cost Wireless Internet System for Rural India using Geosynchronous Satellite in an Inclined Orbit. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/42495
Utah State University
6.
Nafi, Akhter Mahmud.
Practical Optical Survey Strategies for Near Geostationary Orbital Debris.
Degree: PhD, Mechanical and Aerospace Engineering, 2020, Utah State University
URL: https://digitalcommons.usu.edu/etd/7787
► Uncontrolled space objects, more commonly known as space debris, consist of dead satellites, satellite deployment packages, and lost elements of these systems such as…
(more)
▼ Uncontrolled space objects, more commonly known as space debris, consist of dead satellites, satellite deployment packages, and lost elements of these systems such as insulation blankets. These uncontrolled objects represent hazards to our nation’s most valuable space assets which include communication satellites, weather satellites, Earth monitoring systems, and military assets. To help mitigate this problem, this research proposes using the known astrodynamics of the near geosynchronous
orbit (GEO) along with the known concentration of the uncontrolled GEO objects and observation constraints to design ground-based optical surveys that will detect uncatalogued debris. Furthermore, a scoring metric is developed to evaluate the information gain from each survey.
Advisors/Committee Members: David Geller, Kohei Fujimoto, Stephen Whitmore, ;.
Subjects/Keywords: Space situational awareness (SSA); Space debris; Geostationary Orbit; Survey design; State information; Aerospace Engineering
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APA (6th Edition):
Nafi, A. M. (2020). Practical Optical Survey Strategies for Near Geostationary Orbital Debris. (Doctoral Dissertation). Utah State University. Retrieved from https://digitalcommons.usu.edu/etd/7787
Chicago Manual of Style (16th Edition):
Nafi, Akhter Mahmud. “Practical Optical Survey Strategies for Near Geostationary Orbital Debris.” 2020. Doctoral Dissertation, Utah State University. Accessed January 18, 2021.
https://digitalcommons.usu.edu/etd/7787.
MLA Handbook (7th Edition):
Nafi, Akhter Mahmud. “Practical Optical Survey Strategies for Near Geostationary Orbital Debris.” 2020. Web. 18 Jan 2021.
Vancouver:
Nafi AM. Practical Optical Survey Strategies for Near Geostationary Orbital Debris. [Internet] [Doctoral dissertation]. Utah State University; 2020. [cited 2021 Jan 18].
Available from: https://digitalcommons.usu.edu/etd/7787.
Council of Science Editors:
Nafi AM. Practical Optical Survey Strategies for Near Geostationary Orbital Debris. [Doctoral Dissertation]. Utah State University; 2020. Available from: https://digitalcommons.usu.edu/etd/7787
Texas A&M University
7.
Bourgeois, Scott K.
Rock-Around Orbits.
Degree: MS, Aerospace Engineering, 2010, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7473
► The ability to observe resident space objects (RSOs) is a necessary requirement for space situational awareness. While objects in a Low-Earth Orbit are easily ob-…
(more)
▼ The ability to observe resident space objects (RSOs) is a necessary requirement
for space situational awareness. While objects in a Low-Earth
Orbit are easily ob-
servable by ground-based sensors, diffculties arise when trying to monitor objects
with larger orbits far above the Earth's surface, e.g. a
Geostationary Orbit. Camera
systems mounted on satellites can provide an eff ective way to observe these objects.
Using a satellite with a speci c
orbit relative to the RSO's
orbit, one can passively
observe all the objects that share the RSO's
orbit over a given time without active
maneuvering.
An
orbit can be defi ned by ve parameters: semi-major axis, eccentricity, right
ascension of ascending node, inclination, and argument of perigee (a; e;
; i; !). Using
these parameters, one can create an
orbit that will surround the target
orbit allowing
the satellite in the Rock-Around
Orbit (RAO)
orbit to have a 360 degree view of
RSOs in the target
orbit. The RAO
orbit can be applied to any circular or elliptical
target
orbit; and for any target
orbit, there are many possible RAO orbits. Therefore,
diff erent methods are required to narrow down the selection of RAO orbits. These
methods use distance limitations, time requirements,
orbit perturbations, and other
factors to limit the
orbit selections.
The first step is to determine the range of RAO semi-major axes for any given
target
orbit by ensuring the RAO
orbit does not exceed a prescribed maximum al-
lowable distance, dmax from the target
orbit. It is then necessary to determine the
eccentricity range for each possible RAO semi-major axis. This is done by ensuring the RAO still does not exceed dmax but also ensuring that the RAO
orbit travels
inside and outside of the target
orbit. This comprises one half of the rock-around
motion. The final step is to determine the inclination of the RAO
orbit. Only a
small inclination different from that of the target
orbit is required to complete the
rock-around motion while the maximum inclination is found by making sure the RAO
orbit does not exceed dmax.
It is then important to consider
orbit perturbations, since they can destroy the
synchronization between the RAO and target
orbit. By examining the e ffects of the
linear J2 perturbations on the right ascension of ascending node and argument of
perigee, the correct semi-major axis, eccentricity, and inclination can be chosen to
minimize the amount of fuel required for station keeping. The optimal values can be
found by finding the Delta v needed for di fferent combinations of the variables and then
choosing the values that provide the minimum Delta v.
For any target
orbit, there are multiple RAO
orbit possibilities that can provide
360 degree coverage of a target
orbit. Even after eliminating some of them based
on the methods already described, there are still many possibilities. The rest of the
elimination process would then be based on the mission requirements which could be
the range of an on-board sensor, the thruster or reaction wheel controls, or any other
number of…
Advisors/Committee Members: Mortari, Daniele (advisor), Hyland, David (committee member), Pollock, Tom (committee member), Rojas, Maurice (committee member).
Subjects/Keywords: orbit; surveillance; orbital; dynamics; mechanics; geo; geostationary; geosynchronous; rock around; rock-around
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APA (6th Edition):
Bourgeois, S. K. (2010). Rock-Around Orbits. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7473
Chicago Manual of Style (16th Edition):
Bourgeois, Scott K. “Rock-Around Orbits.” 2010. Masters Thesis, Texas A&M University. Accessed January 18, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7473.
MLA Handbook (7th Edition):
Bourgeois, Scott K. “Rock-Around Orbits.” 2010. Web. 18 Jan 2021.
Vancouver:
Bourgeois SK. Rock-Around Orbits. [Internet] [Masters thesis]. Texas A&M University; 2010. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7473.
Council of Science Editors:
Bourgeois SK. Rock-Around Orbits. [Masters Thesis]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7473
University of Bradford
8.
Fenech, Hector Tony.
Satellite multiple access protocols for land mobile terminals : a study of the multiple access environment for land mobile satellite terminals, including the design analysis and simulation of a suitable protocol and the evaluation of its performance in a U.K. system.
Degree: PhD, 1987, University of Bradford
URL: http://hdl.handle.net/10454/5028
► This thesis is a study of multiple access schemes for satellite land mobile systems that provide a domestic or regional service to a large number…
(more)
▼ This thesis is a study of multiple access schemes for satellite land mobile systems that provide a domestic or regional service to a large number of small terminals. Three orbit options are studied, namely the geostationary, elliptical (Molniya) and inclined circular orbits. These are investigated for various mobile applications and the choice of the Molniya orbit is justified for a U. K. system. Frequency, Time and Code Division Multiple Access (FDMA, TDMA and CDMA) are studied and their relative merits in the mobile environment are highlighted. A hybrid TDMA/FDMA structure is suggested for a large system. Reservation ALOHA schemes are appraised in a TDMA environment and an adaptive reservation multiple access protocol is proposed and analysed for a wide range of mobile communication traffic profiles. The system can cope with short and long data messages as well as voice calls. Various protocol options are presented and a target system having 100,000 users is considered. Analyses are presented for the steady state of protocols employing pure and slotted ALOHA and for the stabilty of the slotted variant, while simulation techniques were employed to validate the steady state analysis of the slotted ALOHA protocol and to analyse the stability problem of the pure ALOHA version. An innovative technique is put forward to integrate the reservation and the acquisition processes. It employs the geographical spread of the users to form part of the random delay in P-ALOHA. Finally an economic feasibility study is performed for the spacesegment. For costs of capital (r) less than 23 % the discounted payback period is less than the project's lifetime (10 years). At r- 8% the payback period is about 5.6 years, while the internal-rate-of-return is 22.2 %. The net present value at the end of the projects lifetime is £M 70 at r-8%.
Subjects/Keywords: 621.382; Satellite multiple access protocols; Land mobile terminals; Multiple access environment; Design and analysis; Simulation; Performance evaluation; United Kingdom (UK); Geostationary orbit; Elliptical orbit; Inclined circular orbit
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APA (6th Edition):
Fenech, H. T. (1987). Satellite multiple access protocols for land mobile terminals : a study of the multiple access environment for land mobile satellite terminals, including the design analysis and simulation of a suitable protocol and the evaluation of its performance in a U.K. system. (Doctoral Dissertation). University of Bradford. Retrieved from http://hdl.handle.net/10454/5028
Chicago Manual of Style (16th Edition):
Fenech, Hector Tony. “Satellite multiple access protocols for land mobile terminals : a study of the multiple access environment for land mobile satellite terminals, including the design analysis and simulation of a suitable protocol and the evaluation of its performance in a U.K. system.” 1987. Doctoral Dissertation, University of Bradford. Accessed January 18, 2021.
http://hdl.handle.net/10454/5028.
MLA Handbook (7th Edition):
Fenech, Hector Tony. “Satellite multiple access protocols for land mobile terminals : a study of the multiple access environment for land mobile satellite terminals, including the design analysis and simulation of a suitable protocol and the evaluation of its performance in a U.K. system.” 1987. Web. 18 Jan 2021.
Vancouver:
Fenech HT. Satellite multiple access protocols for land mobile terminals : a study of the multiple access environment for land mobile satellite terminals, including the design analysis and simulation of a suitable protocol and the evaluation of its performance in a U.K. system. [Internet] [Doctoral dissertation]. University of Bradford; 1987. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/10454/5028.
Council of Science Editors:
Fenech HT. Satellite multiple access protocols for land mobile terminals : a study of the multiple access environment for land mobile satellite terminals, including the design analysis and simulation of a suitable protocol and the evaluation of its performance in a U.K. system. [Doctoral Dissertation]. University of Bradford; 1987. Available from: http://hdl.handle.net/10454/5028
Brno University of Technology
9.
Koziel, David.
Návrh vesmírné mise: Space mission design.
Degree: 2020, Brno University of Technology
URL: http://hdl.handle.net/11012/192566
► In this work, there are basic laws and knowledge relating to space flights into an orbit around the Earth. Also, there are instructions for beginners,…
(more)
▼ In this work, there are basic laws and knowledge relating to space flights into an
orbit around the Earth. Also, there are instructions for beginners, who want to work with the GMAT program (General Mission Analysis Tool), which is the program used for designing space missions. In the final part of the work, there is also a use of the program demonstrated on a specific mission of a satellite (CubeSat) into the
Geostationary Earth
Orbit. In this section, there is a described method of work, individual relevant functions of the program and possibilities, and a way of work in it. Finally, graphical and data outputs of the simulation are evaluated. Therefore, the output of the work is complex characteristics of the basics of problems of space mission design and a brief GMAT software guide, which could be used in the future to teach.
Advisors/Committee Members: Zikmund, Pavel (advisor), Navrátil, Jan (referee).
Subjects/Keywords: Manuál GMAT R2018a; General Mission Analysis Tool; geostacionární oběžná dráha; návrh vesmírné mise; návod pro GMAT; základy vesmírného letu; orbitální mechanika; výpočtová simulace; geostacionární družice; Manual GMAT R2018a; General Mission Analysis Tool; geostationary orbit; space mission design; GMAT instructions; basics of spaceflight; orbital mechanics; computational simulation; geostationary satellite
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APA (6th Edition):
Koziel, D. (2020). Návrh vesmírné mise: Space mission design. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/192566
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Koziel, David. “Návrh vesmírné mise: Space mission design.” 2020. Thesis, Brno University of Technology. Accessed January 18, 2021.
http://hdl.handle.net/11012/192566.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Koziel, David. “Návrh vesmírné mise: Space mission design.” 2020. Web. 18 Jan 2021.
Vancouver:
Koziel D. Návrh vesmírné mise: Space mission design. [Internet] [Thesis]. Brno University of Technology; 2020. [cited 2021 Jan 18].
Available from: http://hdl.handle.net/11012/192566.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Koziel D. Návrh vesmírné mise: Space mission design. [Thesis]. Brno University of Technology; 2020. Available from: http://hdl.handle.net/11012/192566
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
10.
Cambazard, Victor.
Ordre juridique spatial et marchandisation des fréquences : Spatial legal order and commercialization of frequencies.
Degree: Docteur es, Droit public, 2017, Lyon
URL: http://www.theses.fr/2017LYSE3009
► La thèse a pour objet la démonstration de l’évolution et de l’adaptation du système international de répartition et de distribution des ressources de l’espace extra-atmosphérique…
(more)
▼ La thèse a pour objet la démonstration de l’évolution et de l’adaptation du système international de répartition et de distribution des ressources de l’espace extra-atmosphérique à la nature même de ces ressources dans un premier temps et à l’évolution des utilisations qui en ont été faites dans un second. Ces modifications factuelles se traduisent par des adaptations institutionnelles, juridiques. Elles s’expliquent certes par les évolutions des moyens de communication, par le besoin grandissant des acteurs en charge de missions de service public d’abord, puis des sociétés de droit privées ensuite, de fournir de nouveaux services au plus grand nombre. Au sein des ressources de l’espace extra-atmosphérique, figure en premier lieu le spectre hertzien, à savoir les bandes hertziennes sur lesquelles il sera possible de transmettre un signal et de mettre en place un service particulier. Ce « spectre », à l’instar du spectre lumineux, est fini et présente diverses caractéristiques, fonction de la partie de ce dernier dont il s’agit. Les services d’astronomie, de géolocalisation, de radio transmission ou encore de météorologie verront leur efficacité accrue sur certaines fréquences hertziennes, et ne pourront fonctionner proprement sur d’autres. La disponibilité de ces fréquences est donc limitée, et celles-ci entrent en conséquence dans la définition des ressources rares. Entrent également dans la catégorie des ressources qualifiées de rares, les orbites terrestres sur lesquelles il est possible de placer des satellites de communication à rendement optimum. Celles-ci sont naturellement limitées par une restriction physique matérielle, à savoir la place qu’il leur sera attribué, à la différence des ressources hertziennes, quantifiées via un spectre immatériel. Leur caractéristique de ressource naturelle rare / limitée a contraint les acteurs internationaux, premiers utilisateurs, à définir des principes pour le partage, la répartition et l’utilisation desdites ressources. Cependant, et si les principes développés initialement sont toujours d’actualité, le mode de répartition préconisé à l’origine, à savoir « premier arrivé, premier servi » a été le vecteur de nombreuses distorsions, voire non-respect flagrant, des principes précités. En effet, la privatisation des activités spatiales, notamment des activités de télécommunications, ainsi que des organisations internationales initialement chargées de la bonne coordination de l’utilisation de ces ressources, telle qu’étudiée ici, fût suscitée par le potentiel lucratif desdites activités, accompagnée par leur libéralisation parfois normative, et par des besoins croissants pour des types de technologies sans cesse renouvelés. Elle a toutefois dû s’effectuer en coordination avec les instances internationales chargées de la répartition et de la régulation des ressources hertziennes au niveau mondial, et plus précisément de l’Union internationale des télécommunications. C’est cette organisation qui constitue le centre de gravité de notre étude. Elle est un objet à part,…
Advisors/Committee Members: Couston, Mireille (thesis director).
Subjects/Keywords: Espace; Extra-Atmosphérique; Fictif; Fréquences; Géostationnaire; Hertzien; International; Juridique; Marchandisation; Orbite; Radiocommunications; Ressource rare; Revente; Satellite; Spatial; Spectre; Télécommunications; Uit; Virtuel; Fictitious; Frequencies; Geostationary; International; Itu; Legal; Merchandising; Orbit; Outer space; Radiocommunications; Radio; Rare resource; Resale; Satellite; Space; Spectrum; Telecommunications; Virtual; 340
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Cambazard, V. (2017). Ordre juridique spatial et marchandisation des fréquences : Spatial legal order and commercialization of frequencies. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2017LYSE3009
Chicago Manual of Style (16th Edition):
Cambazard, Victor. “Ordre juridique spatial et marchandisation des fréquences : Spatial legal order and commercialization of frequencies.” 2017. Doctoral Dissertation, Lyon. Accessed January 18, 2021.
http://www.theses.fr/2017LYSE3009.
MLA Handbook (7th Edition):
Cambazard, Victor. “Ordre juridique spatial et marchandisation des fréquences : Spatial legal order and commercialization of frequencies.” 2017. Web. 18 Jan 2021.
Vancouver:
Cambazard V. Ordre juridique spatial et marchandisation des fréquences : Spatial legal order and commercialization of frequencies. [Internet] [Doctoral dissertation]. Lyon; 2017. [cited 2021 Jan 18].
Available from: http://www.theses.fr/2017LYSE3009.
Council of Science Editors:
Cambazard V. Ordre juridique spatial et marchandisation des fréquences : Spatial legal order and commercialization of frequencies. [Doctoral Dissertation]. Lyon; 2017. Available from: http://www.theses.fr/2017LYSE3009
11.
Ngo, Phuong Linh.
Detection of in-plane orbital manoeuvres from a catalogue of geostationary objects.
Degree: Space Technology, 2020, Luleå University of Technology
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-81475
► The number of man-made space objects is dramatically growing nowadays. The continuous monitoring and studying of these objects are necessary to keep their number…
(more)
▼ The number of man-made space objects is dramatically growing nowadays. The continuous monitoring and studying of these objects are necessary to keep their number under control and ensure safe space operations. With respect thereto, international guidelines recommend decongesting the most populated space regions from satellites arriving at the end of their operational lifetime by performing post-mission disposal strategies. In general, a satellite is considered to be functional if it is still performing periodic manoeuvres to stay within the orbital operation configuration. This study presents a promising method to detect historical in-plane manoeuvrers of satellites on a geostationary orbit (GEO). Since a manoeuvrer changes the orbital state of the spacecraft, its effect can be detected by comparing the observed data to a reference evolution. In this case, the model is represented by the dynamical model STELA based on a semi-analytical theory. The observed data is provided by the public American space object catalogue. The Two-line element (TLE) database contains the orbital state of each tracked object, however, not all six orbital parameters are interesting to study in terms of in- plane manoeuvrers. The evolution of the longitude and of the eccentricity vector is immediately affected by a manoeuvre that changes the shape or the size of an orbit. Within the longitude analysis, the manoeuvre epoch is estimated by focusing on the manoeuvre strategy. An operational spacecraft usually performs a manoeuvre as soon as the longitude motion threatens to violate the operational deadband. Consequently, the longitude evolution follows a parabolic motion. Two polynomial curves of second degree are laid over the observation: the first curve is derived from a simplified dynamical model and the second curve is directly obtained through a Least Squares (LS) fitting method. The discrepancy between the LS and physical fitted parabolas gives an indication on the quality of the input data, that is to say, of the TLEs. The detected manoeuvre epoch must be companioned by a confidential parameter that denotes the time range around the estimated epoch in which the manoeuvre is expected to have happened. The manoeuvre interval is then forwarded to the eccentricity analysis where the manoeuvrer epoch is estimated more precisely by studying the divergence between the observed and expected eccentricity vector evolution. The latter is propagated with STELA after having estimated the area-to-mass ratio that is needed in order to model the perturbation effects accurately upon which the performance of the dynamical reference model strongly depends. As soon as the observed eccentricity vector deviates significantly from the expected evolution, the epoch and the velocity ΔV of the manoeuvre can be recovered, too.
Subjects/Keywords: manoeuvre detection; geostationary orbit; perturbations; filters; Two-line elements; station keeping; Other Earth and Related Environmental Sciences; Annan geovetenskap och miljövetenskap; Other Engineering and Technologies not elsewhere specified; Övrig annan teknik; Computer Sciences; Datavetenskap (datalogi); Other Physics Topics; Annan fysik
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APA ·
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APA (6th Edition):
Ngo, P. L. (2020). Detection of in-plane orbital manoeuvres from a catalogue of geostationary objects. (Thesis). Luleå University of Technology. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-81475
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ngo, Phuong Linh. “Detection of in-plane orbital manoeuvres from a catalogue of geostationary objects.” 2020. Thesis, Luleå University of Technology. Accessed January 18, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-81475.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ngo, Phuong Linh. “Detection of in-plane orbital manoeuvres from a catalogue of geostationary objects.” 2020. Web. 18 Jan 2021.
Vancouver:
Ngo PL. Detection of in-plane orbital manoeuvres from a catalogue of geostationary objects. [Internet] [Thesis]. Luleå University of Technology; 2020. [cited 2021 Jan 18].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-81475.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ngo PL. Detection of in-plane orbital manoeuvres from a catalogue of geostationary objects. [Thesis]. Luleå University of Technology; 2020. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-81475
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
12.
VICTORIA VELASCO, FERNANDO JOSÉ.
HISTORIA, EVOLUCIÓN Y UTILIZACIÓN DE LOS SATÉLITES DE TELECOMUNICACIONES Y SU REGULACIÓN NORMATIVA INTERNACIONAL
.
Degree: 2013, Universidad de los Andes
URL: https://documentodegrado.uniandes.edu.co/documentos/9331.pdf
► Este trabajo pretende hacer un análisis sobre la utilización de los satélites de telecomunicaciones a través de la historia, y de la normatividad internacional que…
(more)
▼ Este trabajo pretende hacer un análisis sobre la utilización de los satélites de telecomunicaciones a través de la historia, y de la normatividad internacional que ha surgido en esta materia. El objetivo del mismo es lograr hacer un resumen de la evolución de la tecnología satelital, y a su vez hacer una compilación de la normatividad y regulación de la materia. Para así poder hacer un análisis de la evolución normativa, y su avance en relación con los desarrollos de la tecnología satelital. Igualmente se darán a conocer elementos que permitan saber si la normativa internacional se encuentra vigente con respecto a la tecnología existente en la actualidad. Este es un tema importante, principalmente debido al desarrollo de las actividades tecnológicas, las cuales requieren de la utilización de satélites ubicados en el Espacio. Entre estas actividades se destacan algunas como lo son la telefonía, el internet y la televisión. Justamente ante esta realidad, es necesario tener un conocimiento de las regulaciones de derecho, lo cual permita ampliar el conocimiento para el manejo de estas actividades. Es importante mencionar que esta es una actividad relativamente nueva, y como ha sucedido a lo largo de la historia, la normatividad jurídica suele ser una respuesta a los hechos, por lo cual es posterior a los mismos. Ante el vertiginoso avance que ha tenido la tecnología en los últimos años, es importante que la normatividad vaya a la misma velocidad. Igualmente, este es un campo el cual no se ha desarrollado de manera amplia en Colombia, por lo cual también es apropiado que se tenga un marco normativo aplicable en el país, a partir del conocimiento de las regulaciones internacionales. Por lo tanto, lo que se plantea es una investigación que permita conocer y entender cuáles son las normativas y regulaciones internacionales actuales aplicables para la utilización de los satélites de telecomunicaciones.
Advisors/Committee Members: Rey Cordoba Jesus Alfredo (advisor).
Subjects/Keywords: -Satélite/ Satellite -Satélite de Telecomunicación/ Telecommunication Satellite -Telecomunicaciones/ Telecommunications -Órbita/ Orbit -Órbita Geoestacionaria/ Geostationary Orbit -Órbita de los Satélites Geoestacionarios/ Geostationary - Satellite Orbit -Soft Law/ Soft Law -Consenso/ Consensus -Cooperación/ Cooperation -Confianza/ Trust -Unión Internacional de Telecomunicaciones (UIT) / International Telecommunications Union (ITU) -Organización de las Naciones Unidas (ONU) / United Nations (UN)
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APA ·
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APA (6th Edition):
VICTORIA VELASCO, F. J. (2013). HISTORIA, EVOLUCIÓN Y UTILIZACIÓN DE LOS SATÉLITES DE TELECOMUNICACIONES Y SU REGULACIÓN NORMATIVA INTERNACIONAL
. (Thesis). Universidad de los Andes. Retrieved from https://documentodegrado.uniandes.edu.co/documentos/9331.pdf
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
VICTORIA VELASCO, FERNANDO JOSÉ. “HISTORIA, EVOLUCIÓN Y UTILIZACIÓN DE LOS SATÉLITES DE TELECOMUNICACIONES Y SU REGULACIÓN NORMATIVA INTERNACIONAL
.” 2013. Thesis, Universidad de los Andes. Accessed January 18, 2021.
https://documentodegrado.uniandes.edu.co/documentos/9331.pdf.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
VICTORIA VELASCO, FERNANDO JOSÉ. “HISTORIA, EVOLUCIÓN Y UTILIZACIÓN DE LOS SATÉLITES DE TELECOMUNICACIONES Y SU REGULACIÓN NORMATIVA INTERNACIONAL
.” 2013. Web. 18 Jan 2021.
Vancouver:
VICTORIA VELASCO FJ. HISTORIA, EVOLUCIÓN Y UTILIZACIÓN DE LOS SATÉLITES DE TELECOMUNICACIONES Y SU REGULACIÓN NORMATIVA INTERNACIONAL
. [Internet] [Thesis]. Universidad de los Andes; 2013. [cited 2021 Jan 18].
Available from: https://documentodegrado.uniandes.edu.co/documentos/9331.pdf.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
VICTORIA VELASCO FJ. HISTORIA, EVOLUCIÓN Y UTILIZACIÓN DE LOS SATÉLITES DE TELECOMUNICACIONES Y SU REGULACIÓN NORMATIVA INTERNACIONAL
. [Thesis]. Universidad de los Andes; 2013. Available from: https://documentodegrado.uniandes.edu.co/documentos/9331.pdf
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Luleå University of Technology
13.
Neokleous, Kleanthis.
Modeling and control of a satellite’s geostationary orbit.
Degree: 2007, Luleå University of Technology
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-46737
► In this Thesis a complete model of the dynamics describing the orbit of a geostationary satellite has been developed by using the Euler-Hill equations…
(more)
▼ In this Thesis a complete model of the dynamics describing the orbit of a geostationary satellite has been developed by using the Euler-Hill equations of relative motion. Following that, a system has been developed to control the satellite’s motion, which was the main objective of this work. Typically, this is classic problem in formation flight when the objective is to follow a “leader” or an analogous formation. On a similar basis, the idea developed and applied in this Thesis, was to control the satellite in order to minimize the distance from the satellite to the “leader” which in this case, is considered as a point orbiting in an ideal trajectory, irrespective of external or internal influences or disturbances. Real satellites are influenced by disturbances. Consequently, models causing those disturbances were developed. Finally, the satellite’s trajectory has been controlled using optimum and robust control design methods such as an LQ regulator and an H-infinity optimal control synthesis approach.
Validerat; 20101217 (root)
Subjects/Keywords: Physics Chemistry Maths; Geostationary orbit; optimum control; Extended Kalman Filter; H-infinity control synthesis; Linear Quadratic Regulator; sun-moon disturbances; Fysik; Kemi; Matematik
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APA ·
Chicago ·
MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Neokleous, K. (2007). Modeling and control of a satellite’s geostationary orbit. (Thesis). Luleå University of Technology. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-46737
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Neokleous, Kleanthis. “Modeling and control of a satellite’s geostationary orbit.” 2007. Thesis, Luleå University of Technology. Accessed January 18, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-46737.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Neokleous, Kleanthis. “Modeling and control of a satellite’s geostationary orbit.” 2007. Web. 18 Jan 2021.
Vancouver:
Neokleous K. Modeling and control of a satellite’s geostationary orbit. [Internet] [Thesis]. Luleå University of Technology; 2007. [cited 2021 Jan 18].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-46737.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Neokleous K. Modeling and control of a satellite’s geostationary orbit. [Thesis]. Luleå University of Technology; 2007. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-46737
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
. 
Open Access Theses and Dissertations