subject:(geosynchronous orbit)

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)

Subjects/Keywords: active debris removal; geostationary orbit; geosynchronous orbit; orbital debris; Aerospace Engineering

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APA (6^th 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 (16^th Edition):

Anderson, Paul V. “Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime.” 2010. Doctoral Dissertation, University of Colorado. Accessed January 19, 2021. https://scholar.colorado.edu/asen_gradetds/14.

MLA Handbook (7^th Edition):

Anderson, Paul V. “Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime.” 2010. Web. 19 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 19]. 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 · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th 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 (16^th Edition):

Anderson, Paul Vincent. “Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime.” 2015. Doctoral Dissertation, University of Colorado. Accessed January 19, 2021. https://scholar.colorado.edu/asen_gradetds/91.

MLA Handbook (7^th Edition):

Anderson, Paul Vincent. “Characterizing Longitude-Dependent Orbital Debris Congestion in the Geosynchronous Orbit Regime.” 2015. Web. 19 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 19]. 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

Utah State University

3. Andrews, Blythe A. Analysis of Angles-Only Hybrid Space-Based/Ground-Based Approach for Geosynchronous Orbit Catalog Maintenance.

Degree: PhD, Mechanical and Aerospace Engineering, 2017, Utah State University

URL: https://digitalcommons.usu.edu/etd/6550

► Geosynchronous Equatorial Orbit (GEO) is critical to Earth communications, weather monitoring, and national defense. Orbit estimation of GEO objects is difficult due to physical… (more)

Subjects/Keywords: Angles-Only; Geosynchronous; Orbit; Aerospace Engineering; Mechanical Engineering

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APA (6^th Edition):

Andrews, B. A. (2017). Analysis of Angles-Only Hybrid Space-Based/Ground-Based Approach for Geosynchronous Orbit Catalog Maintenance. (Doctoral Dissertation). Utah State University. Retrieved from https://digitalcommons.usu.edu/etd/6550

Chicago Manual of Style (16^th Edition):

Andrews, Blythe A. “Analysis of Angles-Only Hybrid Space-Based/Ground-Based Approach for Geosynchronous Orbit Catalog Maintenance.” 2017. Doctoral Dissertation, Utah State University. Accessed January 19, 2021. https://digitalcommons.usu.edu/etd/6550.

MLA Handbook (7^th Edition):

Andrews, Blythe A. “Analysis of Angles-Only Hybrid Space-Based/Ground-Based Approach for Geosynchronous Orbit Catalog Maintenance.” 2017. Web. 19 Jan 2021.

Vancouver:

Andrews BA. Analysis of Angles-Only Hybrid Space-Based/Ground-Based Approach for Geosynchronous Orbit Catalog Maintenance. [Internet] [Doctoral dissertation]. Utah State University; 2017. [cited 2021 Jan 19]. Available from: https://digitalcommons.usu.edu/etd/6550.

Council of Science Editors:

Andrews BA. Analysis of Angles-Only Hybrid Space-Based/Ground-Based Approach for Geosynchronous Orbit Catalog Maintenance. [Doctoral Dissertation]. Utah State University; 2017. Available from: https://digitalcommons.usu.edu/etd/6550

University of Colorado

4. Tombasco, Jill. Orbit Estimation of Geosynchronous Objects Via Ground-Based and Space-Based Optical Tracking.

Degree: PhD, Aerospace Engineering Sciences, 2011, University of Colorado

URL: https://scholar.colorado.edu/asen_gradetds/31

► Angles-only orbit estimation of geosynchronous objects is a unique challenge due to the dense population of clustered geosynchronous objects, the singularities of and perturbations… (more)

▼ Angles-only orbit estimation of geosynchronous objects is a unique challenge due to the dense population of clustered geosynchronous objects, the singularities of and perturbations to geosynchronous motion, and the error inherent to experimental observations of geosynchronous objects. Passive optical tracking of geosynchronous space objects has traditionally been performed by ground-based sensors, and the capability has advanced significantly through the introduction of space-based angles-only tracking. This research addresses three key facets of geosynchronous orbit estimation accuracy: improvement to the accuracy via appropriate coordinate modeling, empirical characterization of achievable ground-based angles-only estimation accuracy, and analytic modeling of the space-based angles-only estimated uncertainty. This research develops and analyzes improvements to geosynchronous orbit estimation based on high-fidelity dynamic modeling with a specialized set of coordinates designed specifically to address the geosynchronous orbit conditions. The use of an appropriate representation, the GEO elements, enhances the orbit estimation accuracy compared to the more traditional inertial Cartesian state space representation of geosynchronous motion. Simulation and experimental studies demonstrate that GEO element estimation better recovers the in-track motion than inertial position and velocity state estimation. The short-term estimation accuracy given ground-based tracking is characterized empirically using the Wide Area Augmentation System satellite reference ephemerides. The results show that 10 meter accuracy is possible given short sampling intervals (10 to 30 seconds) and long nightly track lengths (3 or more hours). Several tracking scenarios are found to meet accuracy requirements on the order of 100 meters. The observability of relative states using space-based angles-only tracking of geosynchronous objects by a geosynchronous sensor is analyzed, and first-order analytic expressions for the predicted uncertainty of the along-track separation and intersatellite range are developed assuming space-based passive tracking. The uncertainty models are validated via Monte Carlo analysis. The results demonstrate that 1 hour of continuous space-based passive tracking can estimate the range to the order of tens of meters, and 12 hours produces range uncertainty on the order of meters. The outcome of this research is a set of methods to improve the performance of geosynchronous orbit estimation, and an enhanced understanding of the accuracy possibilities of angles-only ground-based and space-based geosynchronous orbit estimation. Advisors/Committee Members: Penina Axelrad, George Born, Hanspeter Schaub.

Subjects/Keywords: angles-only; geosynchronous; orbit dynamics; orbit estimation; space-based optical tracking; Aerospace Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tombasco, J. (2011). Orbit Estimation of Geosynchronous Objects Via Ground-Based and Space-Based Optical Tracking. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/asen_gradetds/31

Chicago Manual of Style (16^th Edition):

Tombasco, Jill. “Orbit Estimation of Geosynchronous Objects Via Ground-Based and Space-Based Optical Tracking.” 2011. Doctoral Dissertation, University of Colorado. Accessed January 19, 2021. https://scholar.colorado.edu/asen_gradetds/31.

MLA Handbook (7^th Edition):

Tombasco, Jill. “Orbit Estimation of Geosynchronous Objects Via Ground-Based and Space-Based Optical Tracking.” 2011. Web. 19 Jan 2021.

Vancouver:

Tombasco J. Orbit Estimation of Geosynchronous Objects Via Ground-Based and Space-Based Optical Tracking. [Internet] [Doctoral dissertation]. University of Colorado; 2011. [cited 2021 Jan 19]. Available from: https://scholar.colorado.edu/asen_gradetds/31.

Council of Science Editors:

Tombasco J. Orbit Estimation of Geosynchronous Objects Via Ground-Based and Space-Based Optical Tracking. [Doctoral Dissertation]. University of Colorado; 2011. Available from: https://scholar.colorado.edu/asen_gradetds/31

University of Colorado

5. Gehly, Steven. Estimation of Geosynchronous Space Objects Using Finite Set Statistics Filtering Methods.

Degree: PhD, Aerospace Engineering Sciences, 2016, University of Colorado

URL: https://scholar.colorado.edu/asen_gradetds/148

► The use of near Earth space has increased dramatically in the past few decades, and operational satellites are an integral part of modern society. The… (more)

▼ The use of near Earth space has increased dramatically in the past few decades, and operational satellites are an integral part of modern society. The increased presence in space has led to an increase in the amount of orbital debris, which poses a growing threat to current and future space missions. Characterization of the debris environment is crucial to our continued use of high value orbit regimes such as the geosynchronous (GEO) belt. Objects in GEO pose unique challenges, by virtue of being densely spaced and tracked by a limited number of sensors in short observation windows. This research examines the use of a new class of multitarget filters to approach the problem of orbit determination for the large number of objects present. The filters make use of a recently developed mathematical toolbox derived from point process theory known as Finite Set Statistics (FISST). Details of implementing FISST-derived filters are discussed, and a qualitative and quantitative comparison between FISST and traditional multitarget estimators demonstrates the suitability of the new methods for space object estimation. Specific challenges in the areas of sensor allocation and initial orbit determination are addressed in the framework. The sensor allocation scheme makes use of information gain functionals as formulated for FISST to efficiently collect measurements on the full multitarget system. Results from a simulated network of three ground stations tracking a large catalog of geosynchronous objects demonstrate improved performance as compared to simpler, non-information theoretic tasking schemes. Further studies incorporate an initial orbit determination technique to initiate new tracks in the multitarget filter. Together with a sensor allocation scheme designed to search for new targets and maintain knowledge of the existing catalog, the method comprises a solution to the search-detect-track problem. Simulation results for a single sensor case show that the problem can be solved for multiple objects with no a priori information, even in the presence of missed detections and false measurements. Collectively, this research seeks to advance the capabilities of FISST-derived filters for use in the estimation of geosynchronous space objects; additional directions for future research are presented in the conclusion. Advisors/Committee Members: Penina Axelrad, Brandon Jones, Jay McMahon, Nisar Ahmed, Gregory Beylkin.

Subjects/Keywords: Geosynchronous Orbit; Information Gain; Initial Orbit Determination; Multitarget Filtering; Random Finite Sets; Sensor Allocation; Aerospace Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gehly, S. (2016). Estimation of Geosynchronous Space Objects Using Finite Set Statistics Filtering Methods. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/asen_gradetds/148

Chicago Manual of Style (16^th Edition):

Gehly, Steven. “Estimation of Geosynchronous Space Objects Using Finite Set Statistics Filtering Methods.” 2016. Doctoral Dissertation, University of Colorado. Accessed January 19, 2021. https://scholar.colorado.edu/asen_gradetds/148.

MLA Handbook (7^th Edition):

Gehly, Steven. “Estimation of Geosynchronous Space Objects Using Finite Set Statistics Filtering Methods.” 2016. Web. 19 Jan 2021.

Vancouver:

Gehly S. Estimation of Geosynchronous Space Objects Using Finite Set Statistics Filtering Methods. [Internet] [Doctoral dissertation]. University of Colorado; 2016. [cited 2021 Jan 19]. Available from: https://scholar.colorado.edu/asen_gradetds/148.

Council of Science Editors:

Gehly S. Estimation of Geosynchronous Space Objects Using Finite Set Statistics Filtering Methods. [Doctoral Dissertation]. University of Colorado; 2016. Available from: https://scholar.colorado.edu/asen_gradetds/148

Texas A&M University

6. 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)

Subjects/Keywords: orbit; surveillance; orbital; dynamics; mechanics; geo; geostationary; geosynchronous; rock around; rock-around

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APA (6^th 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 (16^th Edition):

Bourgeois, Scott K. “Rock-Around Orbits.” 2010. Masters Thesis, Texas A&M University. Accessed January 19, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2009-12-7473.

MLA Handbook (7^th Edition):

Bourgeois, Scott K. “Rock-Around Orbits.” 2010. Web. 19 Jan 2021.

Vancouver:

Bourgeois SK. Rock-Around Orbits. [Internet] [Masters thesis]. Texas A&M University; 2010. [cited 2021 Jan 19]. 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 Michigan

7. Cai, Xia. Investigation of global periodic sawtooth oscillations observed in energetic particle flux at geosynchronous orbit.

Degree: PhD, Earth Sciences, 2007, University of Michigan

URL: http://hdl.handle.net/2027.42/126633

► Sawtooth events are defined as quasi-periodic, large-amplitude particle flux oscillations with a periodicity about 2-4 hours observed by geosynchronous Los Alamos National Laboratory satellites. In… (more)

Subjects/Keywords: Energetic Particle Flux; Geosynchronous Orbit; Global; Investigation; Magnetospheric Substorms; Observed; Periodic; Sawtooth Oscillations; Solar Winds

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Cai, X. (2007). Investigation of global periodic sawtooth oscillations observed in energetic particle flux at geosynchronous orbit. (Doctoral Dissertation). University of Michigan. Retrieved from http://hdl.handle.net/2027.42/126633

Chicago Manual of Style (16^th Edition):

Cai, Xia. “Investigation of global periodic sawtooth oscillations observed in energetic particle flux at geosynchronous orbit.” 2007. Doctoral Dissertation, University of Michigan. Accessed January 19, 2021. http://hdl.handle.net/2027.42/126633.

MLA Handbook (7^th Edition):

Cai, Xia. “Investigation of global periodic sawtooth oscillations observed in energetic particle flux at geosynchronous orbit.” 2007. Web. 19 Jan 2021.

Vancouver:

Cai X. Investigation of global periodic sawtooth oscillations observed in energetic particle flux at geosynchronous orbit. [Internet] [Doctoral dissertation]. University of Michigan; 2007. [cited 2021 Jan 19]. Available from: http://hdl.handle.net/2027.42/126633.

Council of Science Editors:

Cai X. Investigation of global periodic sawtooth oscillations observed in energetic particle flux at geosynchronous orbit. [Doctoral Dissertation]. University of Michigan; 2007. Available from: http://hdl.handle.net/2027.42/126633

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