Numerical Error Envelope Results of Correlator-Based Multipath Mitigation Method for Band-Limited Receivers

Pseudolite systems can solve the positioning problem in the limited scene of the satellite navigation system, but its environment is complicated, and the multipath effect is noticeable. The existing correlator-based multipath mitigation method is mainly an ideal situation under the condition of unlimited bandwidth. Under limited front-end bandwidth, the autocorrelation function (ACF) of the spreading code will be distorted, thereby affecting the code loop tracking performance. This article uses numerical calculation methods to discuss the relationship between code rate, limited front-end bandwidth, and the early-late correlator spacing. It also gives the results of the numerical calculation. For different multipath environments, when designing pseudolite systems and processing signals, the front-end bandwidth, spreading code rate, and the correlator spacing need to be considered comprehensively.