Design of an Anti-saturation System for GNSS Receiver

Abstract

In order to solve the problem of interference in satellite navigation receiver, this paper proposes a two-stage cancellation anti-jamming implementation for GNSS system. Interference cancellation of the RF front-end can improve the saturation power point of the first-stage by more than 25dB, and two-stage cancellation can drop the interference signal power by 60dB. Practical tests shows that the anti-jamming performance of the receiver board increased by about 44dB. The system uses four-channel design and adopts power inversion (PI) and delayed least mean squares (DLMS) algorithms to calculate weights. The eventual system response time is proved in magnitude of us.