Influence of interference type upon adaptive GNSS antenna array performance

Abstract

The traditional view is that different types of interference (or the same type interference generated in different ways) have no effect on the anti-interference performance of GNSS adaptive antenna array. However, in the actual course of the study, it is found that the interference suppression performance of the adaptive array antenna differs for different types of interference. The difference is not obvious when the interference intensity is at low level, but become relatively significant when the interference power becomes larger. There are two types of typical wideband interference in GNSS system: matching spectrum wideband interference and White Gaussian Noise (WGN) wideband interference. In array receiver simulations, the array signal generation methods of these two kinds of interference are different, which was analyzed elaborately in this paper. Signal to aliasing noise ratio (SNRa) of the two types of typical wideband interference was analyzed. It was demonstrated in this paper that SNRa difference is the main reason that causes interference suppression performance difference of two kinds of interference in the same array receiver. Simulation of array transfer function of wideband model verified the theoretical analysis.