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You searched for subject:(Phase coded radar). Showing records 1 – 3 of 3 total matches.

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Delft University of Technology

1. Overdevest, Jeroen (author). Interference in 79 GHz Phase-Coded Automotive Radar.

Degree: 2018, Delft University of Technology

Automotive radars play a crucial role in the reduction of traffic casualties and the realization of autonomous driving due to its robustness and adverse weather tolerance. However, as the penetration rate of automotive radars increases, concerns arise regarding the mutual interference. In contrast to the predominant Frequency-Modulated Continuous Wave (FMCW) radars, Phase-Modulated Continuous Wave (PMCW) radars might provide solutions for the interference problem by coding the waveforms, which brings an additional degree of freedom. In this thesis, a system level overview of the phase-coded radar is presented. Regarding the popular code families, particular attention was given to the Gold, Almost Perfect Autocorrelation Sequences (APAS), and Zero-Correlation Zone (ZCZ) sequences. This thesis has proposed three distinct designs for 16-TX-element MIMO Phase-Coded radar that drives the requirements of a Medium Range Radar (MRR). The conclusion can be drawn that APAS and ZCZ sequences have shown to provide a (sub)optimal design that is emphasized by their perfect correlation characteristics within the designated distance of interest. Furthermore, in full-transmit capacity MIMO, the proposed designs use semi-orthogonal waveforms to provide excellent performance in synchronous PMCW radars. However, performance degrades in case Doppler-shifted reflections are received, whereas sidelobes arise in range due to non-orthogonality. This thesis concludes that the APAS-coded waveforms are most tolerant to Doppler shift; besides, its Time Division Multiplexing (TDM) MIMO Transmission scheme is computationally more efficient than the Code Division Multiplexing (CDM) scheme used in Gold and ZCZ coded waveforms. Finally, the radar-to-radar interference investigation has proven that for uncorrelated PMCW- to-PMCW interference, the noise floor undergoes a consistent increase, which is according to the interference-plus-noise power level calculated from the link budget analysis. This thesis emphasizes these results, as the interference effect in FMCW-to-FMCW (provided by NXP Semiconductors) have seen similar phenomena. Therefore, results in this thesis support the conclusion that coded waveforms do not remove or suppress the energy levels of the interference. For correlated interference, ghost targets might be formed, but this depends on the starting time as well as the starting coded bit of the interferer, as the correlation peak can be formed outside the distance of interest.

Microwave Sensing, Signals and Systems

Advisors/Committee Members: Uysal, Faruk (mentor), Jansen, Feike (mentor), Yarovyi, Alexander (graduation committee), Leus, Geert (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: Automotive radar; PMCW; Phase-coded radar; Interference

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

APA (6th Edition):

Overdevest, J. (. (2018). Interference in 79 GHz Phase-Coded Automotive Radar. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:a22d5686-0d83-402b-94cc-4b49c2a63853

Chicago Manual of Style (16th Edition):

Overdevest, Jeroen (author). “Interference in 79 GHz Phase-Coded Automotive Radar.” 2018. Masters Thesis, Delft University of Technology. Accessed October 22, 2020. http://resolver.tudelft.nl/uuid:a22d5686-0d83-402b-94cc-4b49c2a63853.

MLA Handbook (7th Edition):

Overdevest, Jeroen (author). “Interference in 79 GHz Phase-Coded Automotive Radar.” 2018. Web. 22 Oct 2020.

Vancouver:

Overdevest J(. Interference in 79 GHz Phase-Coded Automotive Radar. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2020 Oct 22]. Available from: http://resolver.tudelft.nl/uuid:a22d5686-0d83-402b-94cc-4b49c2a63853.

Council of Science Editors:

Overdevest J(. Interference in 79 GHz Phase-Coded Automotive Radar. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:a22d5686-0d83-402b-94cc-4b49c2a63853

2. Huyghebaert, Devin 1988-. The Ionospheric Continuous-wave E-region Bistatic Experimental Auroral Radar (ICEBEAR).

Degree: 2019, University of Saskatchewan

The Sun drives many atmospheric processes on Earth through solar electromagnetic radiation, the solar wind, and the solar magnetic field. These solar phenomena interact with a region around the Earth where plasma can be formed, the ionosphere. This region is located 60–1000 km above the surface of the Earth, and is of interest to many scientists and engineers due to the interaction between radio waves and plasma. Variations in the ionospheric plasma density can cause disruptions to GPS signals and radio communications. Attempts have been made to measure the ionospheric plasma properties through the use of rockets, satellites, and remote sensing instrumentation. One of the issues with measuring the ionosphere, specifically the lower altitudes of the ionosphere, is that it is expensive to do in situ. Rockets are required for in situ measurements at altitudes of 90–150 km (the E-region of the ionosphere). Rocket launches are expensive, so more efficient remote methods of measuring the E-region are typically used. This includes radars utilizing radio waves to scatter from the ionospheric plasma. From the scattered signal, plasma properties can be derived to provide insight into the physical processes occurring. The Ionospheric Continuous-wave E-region Bistatic Experimental Auroral Radar (ICEBEAR) was developed to probe the E-region of the ionosphere using this mechanism. Through the use of modern radar hardware and techniques, it was possible to obtain simultaneously high temporal (down to 0.1 s) and spatial (≈ 1.5 km) resolution images of ionospheric plasma density perturbations over a 600 km × 600 km field of view. The radar operates at 49.5 MHz and transmits a continuous-wave, pseudo random noise, phase modulated code to obtain these images. The radar is bistatic, with both transmitter and receiver being located in Saskatchewan, Canada, and operated by the University of Saskatchewan. The radar was designed with future improvements in mind, where each transmitter and receiver antenna are individually controlled/sampled. This Ph.D. dissertation describes the dynamics of the ionosphere, the design and construction of ICEBEAR, and presents some preliminary results, exhibiting the exciting modern capabilities of the system. Advisors/Committee Members: Hussey, Glenn, Bourassa, Adam, Klymyshyn, David, Bradley, Michael, Xiao, Chijin.

Subjects/Keywords: Ionospheric E-region Coherent Scatter radar; Coded phase modulated radar system

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APA (6th Edition):

Huyghebaert, D. 1. (2019). The Ionospheric Continuous-wave E-region Bistatic Experimental Auroral Radar (ICEBEAR). (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12190

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):

Huyghebaert, Devin 1988-. “The Ionospheric Continuous-wave E-region Bistatic Experimental Auroral Radar (ICEBEAR).” 2019. Thesis, University of Saskatchewan. Accessed October 22, 2020. http://hdl.handle.net/10388/12190.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Huyghebaert, Devin 1988-. “The Ionospheric Continuous-wave E-region Bistatic Experimental Auroral Radar (ICEBEAR).” 2019. Web. 22 Oct 2020.

Vancouver:

Huyghebaert D1. The Ionospheric Continuous-wave E-region Bistatic Experimental Auroral Radar (ICEBEAR). [Internet] [Thesis]. University of Saskatchewan; 2019. [cited 2020 Oct 22]. Available from: http://hdl.handle.net/10388/12190.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Huyghebaert D1. The Ionospheric Continuous-wave E-region Bistatic Experimental Auroral Radar (ICEBEAR). [Thesis]. University of Saskatchewan; 2019. Available from: http://hdl.handle.net/10388/12190

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

3. Saleh, Mahdi. Contributions to High Range Resolution Radar Waveforms : Design of Complete Processing Chains of Various Intra-Pulse Modulated Stepped-Frequency Waveforms : Contributions à la mise en œuvre de chaînes de traitement radar fondées sur des formes d'onde à bande synthétique : Conception de chaînes de traitement complètes de diverses formes d'onde à fréquence échelonnée modulées par impulsions.

Degree: Docteur es, Automatique, Productique, Signal et Image, Ingénierie cognitique, 2020, Bordeaux

Dans divers systèmes radar, un grand intérêt a été porté à la sélection d’une forme d’onde et à la conception d’une chaîne de traitement complète, de l’émetteur au récepteur, afin d’obtenir un profil distance haute résolution (HRRP, acronyme de High Range Resolution Profile en anglais). Au cours des dernières décennies, les concepteurs d’algorithmes de traitement du signal radar ont concentré leur attention sur différentes formes d’onde telles que les techniques de compression d’impulsion et les systèmes à bande synthétique (SF acronyme de stepped frequency, en anglais).D’une part, trois types de formes d’onde de compression d’impulsions large bande ont été proposés dans la littérature : la forme d’onde modulée linéairement en fréquence (Linear Frequency Modulation), celle à codes de phase (Phase Coded) et la forme d’onde modulé non linéairement en fréquence (Non Linear Frequency Modulation). Ces approches sont très populaires, mais elles requièrent une fréquence d’échantillonnage généralement élevée au niveau du récepteur, et par voie de conséquence un convertisseur analogique-numérique coûteux. De plus, les formes d’onde PC et NLFM peuvent être préférables dans certaines applications à haute résolution, car elles conduisent à de meilleurs PSLR et ISLR que ceux obtenus avec la forme d’onde LFM.D’autre part, lorsqu’il s’agit de schémas SF, une fréquence d’échantillonnage moins élevée peut être envisagée, ce qui permet d’utiliser un CAN meilleur marché.Ces deux approches peuvent être combinées pour tirer avantage des deux familles. Bien que la combinaison standard mène à l’exploitation d’un CAN bon marché, les performances en termes de PSLR et ISLR ne sont pas nécessairement adaptées. Comme le PSLR et l’ISLR ont une grande influence sur la probabilité de détection et la probabilité de fausse alarme, notre objectif est de trouver des solutions alternatives. Ainsi, notre contribution dans ce mémoire de thèse consiste à proposer deux nouvelles chaînes de traitement, de l’émetteur au récepteur :1) Dans la première approche, le spectre de la forme d’onde à large bande est décomposé en un nombre prédéterminé de portions. Puis, les versions temporelles de ces dernières sont successivement transmises. Le signal reçu est alors traité soit en utilisant un algorithme FD (pour Frequency domain en anglais) modifié, soit un algorithme de reconstruction de forme d’onde réalisé directement dans le domaine temporel (TWR pour time wave reconstruction). Dans cette thèse, les formes d’ondes PC et NLFM ont été sélectionnées. Une étude comparative est alors menée entre les différentes chaînes de traitement, de l’émetteur au récepteur, que l’on peut constituer. Nos simulations montrent que les performances obtenues à partir de l’algorithme TWR sont le plus souvent meilleures que celles de l’algorithme FD modifié. La contre-partie est une augmentation du coût calculatoire. De plus, que ce soit avec une forme d’onde PC ou NLFM, l’approche présentée fournit de meilleurs résultats en termes de PSLR et ISLR que les formes d’onde SF classiques.2)… Advisors/Committee Members: Grivel, Éric (thesis director), Omar, Samir Mohamad (thesis director).

Subjects/Keywords: Forme d'onde radar; HRRP; Système à bande synthétique; Forme d’onde NLFM; Optimisation de formes d’onde; Forme d’onde PC; Radar waveform; HRRP; Stepped frequency; NLFM waveform; Waveform optimization; Phase coded waveform

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

APA (6th Edition):

Saleh, M. (2020). Contributions to High Range Resolution Radar Waveforms : Design of Complete Processing Chains of Various Intra-Pulse Modulated Stepped-Frequency Waveforms : Contributions à la mise en œuvre de chaînes de traitement radar fondées sur des formes d'onde à bande synthétique : Conception de chaînes de traitement complètes de diverses formes d'onde à fréquence échelonnée modulées par impulsions. (Doctoral Dissertation). Bordeaux. Retrieved from http://www.theses.fr/2020BORD0024

Chicago Manual of Style (16th Edition):

Saleh, Mahdi. “Contributions to High Range Resolution Radar Waveforms : Design of Complete Processing Chains of Various Intra-Pulse Modulated Stepped-Frequency Waveforms : Contributions à la mise en œuvre de chaînes de traitement radar fondées sur des formes d'onde à bande synthétique : Conception de chaînes de traitement complètes de diverses formes d'onde à fréquence échelonnée modulées par impulsions.” 2020. Doctoral Dissertation, Bordeaux. Accessed October 22, 2020. http://www.theses.fr/2020BORD0024.

MLA Handbook (7th Edition):

Saleh, Mahdi. “Contributions to High Range Resolution Radar Waveforms : Design of Complete Processing Chains of Various Intra-Pulse Modulated Stepped-Frequency Waveforms : Contributions à la mise en œuvre de chaînes de traitement radar fondées sur des formes d'onde à bande synthétique : Conception de chaînes de traitement complètes de diverses formes d'onde à fréquence échelonnée modulées par impulsions.” 2020. Web. 22 Oct 2020.

Vancouver:

Saleh M. Contributions to High Range Resolution Radar Waveforms : Design of Complete Processing Chains of Various Intra-Pulse Modulated Stepped-Frequency Waveforms : Contributions à la mise en œuvre de chaînes de traitement radar fondées sur des formes d'onde à bande synthétique : Conception de chaînes de traitement complètes de diverses formes d'onde à fréquence échelonnée modulées par impulsions. [Internet] [Doctoral dissertation]. Bordeaux; 2020. [cited 2020 Oct 22]. Available from: http://www.theses.fr/2020BORD0024.

Council of Science Editors:

Saleh M. Contributions to High Range Resolution Radar Waveforms : Design of Complete Processing Chains of Various Intra-Pulse Modulated Stepped-Frequency Waveforms : Contributions à la mise en œuvre de chaînes de traitement radar fondées sur des formes d'onde à bande synthétique : Conception de chaînes de traitement complètes de diverses formes d'onde à fréquence échelonnée modulées par impulsions. [Doctoral Dissertation]. Bordeaux; 2020. Available from: http://www.theses.fr/2020BORD0024

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