Research On Interference Localization For Satellite Based On TDOA Parameters Measurement

The system of satellite interference location involves many fields. This dissertation has studied key technology for interference location for satellite with double or three satellites, especially the time difference of arrival estimation algorithms based on three satellites system.This dissertation has introduced some basic theories for the work and summarized the basic method and principles of satellite interference location technique. For the moment, there are two kinds of systems of satellite interference location-double or three satellites systems. The theory of double satellites location systems is found on time delay of arrival (TDOA) and frequency delay of arrival (FDOA) parameter estimation, and the position of interference can be ascertained by virtue of the two parameters. The theory of three satellites location systems is based on the parameter of time delay of arrival. We need two TDOA parameters to ascertain the position of interference. The point of this dissertation is algorithms of TDOA, it has studied the time delay estimation methods of GCC algorithm and Cross-Bispectrum algorithm; then it has studied adaptive time delay estimation based on LMSTDE, ETDE and ETDGE. Various simulation results are presented for different noise. At last it has studied the algorithm of FOC-LMSTDE, which can give the perfect TDOA estimation while the difference of SNR of the two channels is 30dB.Finally, an overview of the work and the prospect of technique of satellite interference location are presented.