Satellite Interference Direct Geolocation using Long-Time Coherent Integration

The satellite interference geolocation for the signal with low signal-to-noise ratio (SNR) in the adjacent satellite channel is considered. Since the satellite motion is time-varying and cannot be ignored over a long observation time, the traditional geolocation techniques are difficult to deal with the weak signal. In this paper, we proposed a direct geolocation approach using long-time coherent integration. We divided the signal into short segments in two layers to enable coherent integration. Then we introduced a Delay-Doppler operator to compensate for the satellite motion. Finally, we determined the transmitter location from all the observed signals by using the maximum likelihood estimation. This approach can work well for weak signals and achieve high geolocation accuracy. The simulated results validate the effectiveness of the proposed approach.