Subspace array processing for the suppression of FM jamming in GPS receivers

This paper applies the subspace projection array processing techniques for suppression of frequency modulated (FM) jammers in GPS receivers. The FM jammers are instantaneous narrowband and have clear time-frequency (t-f) signatures that are distinct from the GPS C/A spread spectrum code. In the proposed technique, the instantaneous frequency (IF) of the jammer is estimated and used to construct the jammer subspace. With a multi-sensor receiver, both spatial and time-frequency signatures of signal arrivals are used for effective interference suppression. This paper considers the deterministic nature of the GPS C/A code. We derive the receiver SINR, which shows improved performance in strong interference environments.