The Study, Based On Passive Radar Key Technologies Of The Digital Satellite Signal

The passive radar has many advantages on anti-stealth, anti-radiation missile, anti-extra-low flight, so it become the important direction of radar study. The passive radar based on local TV/FM signal has been practical oversea, at the same time, much attention have been paid to it in homeland. However, we can seldom contact some reports about the passive radar based on man-made satellite signal, just several papers mentioned the similar system based on the satellite-borne of analog TV or GPS satellites signal, furthermore, the results of these experiment are not good, this result from the difficulty of realization. Yet with the outstanding superiority of this system, such as the absolute security for the satellite, no blind-area of the target etc, all of this motivates us to research it and find new approaches of solution.From a new aspect, this dissertation conceive the simple system based on the satellite illuminator for the digital audio broadcast(DAB) purpose, and discuss the two problems------target location and signal detection, obtaining some theory fruit at last.On the basis of introduction about this satellite signal, the dissertation bring forwardthe location method------T1R3, that is to say, the system includes three independentreceivers, each of them has two antennas to receive direct signal from satellite and reflected signal from target, the TDOA have been measured through the comparison between this two signals, and the target will be orientated by a complex algorithm . The GDOP simulation show that the system location precision is satisfied. About the signal detection, the dissertation compares the correlation method with the cyclostationary method, and shows the advantages of the cyclostationary method. The simulation indicate that a long time integration may be used to achieve enough processing gain by correlation method, and the idea about multi-channel parallel processing were proposed to solve the contradiction from real-time processing. This dissertation mentions the system structure and the other key technology at the same time, the comparison between the passive radar based on local TV/FM signal and the passive radar based on DAB satellite signal were given.