A study on joint time-difference-of-arrival and angle-of-arrival localization in bistatic passive radar system using DVB-T signal

• Main Authors: Chia-chi Yao, 姚嘉祺
• Other Authors: Hsin-chin Liu
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/uf272u

碩士 === 國立臺灣科技大學 === 電機工程系 === 99 === Unlike an active radar system, a passive radar system only requires a dedicate receiver end to detect airborne targets. To locate the unknown targets, we jointly combine Angle-of-Arrival and Time-Different-of-Arrival information. In this work, we use Multiple Signal Classification algorithm to estimate angle of arrival information of targets, and use ambiguity function to detect targets ranges and Doppler shifts in a bistatic passive radar system. Combining these parameters, we can locate positions of targets. This thesis contains hardware implementation and software simulations. In hardware implementation, we use LYRTECH’s Software Defined Radio platform to implement Multiple Signal Classification algorithm, and use the least square method to compensate the phase and gain caused by RF front-end. In simulations, we first simulate an ambiguity function for digital video broadcasting terrestrial signal, which results in unwanted deterministic peaks due to the guard interval and the pilots in the digital video broadcasting terrestrial passive radar. In order to improve the accuracy of ambiguity function, we remove these unwanted peaks; in the meantime, we also apply a window function to further reduce the ambiguity function sidelobes. Second, we propose a method using beamforming technique and least square method to mapping angles, ranges, and Doppler shifts for multiple airborne targets. Simulation results shows that the proposed mapping scheme can effectively determine positions of multiple targets.