Anti-jamming GPS receivers based on bilinear signal distributions

In this paper, we propose a nonstationary jammer suppression technique for GPS receivers. This technique is based on using the time-frequency distributions (TFDs) to define the jammer time-frequency (t-f) signature. A mask can be constructed and applied such that the masked t-f region captures the jammer energy, but leaves out most of the GPS signals. The jammer signals are synthesized from the masked TFDs and removed from the received signal by orthogonal projection. A method for determining an appropriate mask is discussed. We extend the proposed jammer excision method to multi-antenna GPS receivers.