Research on Near-far Effect and anti-impact noise interference pseudo-code sequence blind estimation algorithm in Pseudo Satellite System

This article focuses on the problem of near-far effects in pseudo-satellite ground-based navigation enhancement systems. First, the article analyzes the near-far effects from the perspective of signal power and from the perspective of correlation values, and briefly introduces several methods to suppress the near-far effects and their applicability. Then introduced the pseudo-code blind estimation algorithm against impact noise. In this paper, fractional low-order statistics combined with M-estimation enhanced projection approximation subspace tracking pseudocode sequence blind estimation algorithm is used to blindly estimate the pseudo-code sequence and simulate the anti-noise effect. The estimation results show that the impact component is basically eliminated and the estimation effect of the pseudo code sequence is very good, which shows that the algorithm has anti-impact noise characteristics and is suitable for high-performance pseudo code information estimation under the condition of low signal-to-noise ratio.