Research On The GNSS High-Precision Receiver Anti-Multipath Technology

Multipath signal is a major error source that significantly affects the measurement of GNSS(Global Navigation Satellite System) high-precision receiver, and multipath rejection has always been the bottleneck and the research focus in the study of satellite navigation. Taking a pre-research subject of “the Eleventh Five-Year Plan” and “the Twelfth Five-Year Plan” as its background, the thesis focuses on the GNSS(Global Navigation Satellite System) receiver anti-multipath technology.Firstly, the thesis makes an exploration of the characteristics of multipath signals and its effects upon the ranging performance of the receiver. By establishing the receiving signal model under multipath environment, the autocorrelation function and the delay lock loop are analyzed. Secondly, the anti-multipath antenna technology is studied. By analyzing the impact of the performance of the antenna on multipath signals, the design principles of the antenna radiator and the choke ring are proposed.The performance of the anti-multipath antenna is also validated through testing.Thirdly, it elaborates the anti-multipath algorithms. Through the analysis of the currently used multipath mitigation technology, the delay lock loop compensation technology based on the sequence correlator as multipath mitigation algorithm is selected, and the validity of the algorithm is verified by using laboratory testing and actual receiving satellites testing. Finally, the anti-multipath performance testing and evaluation methods are analyzed. They are described and validated from the aspect of the construction of multipath environment software simulation system and the construction of anti- multipath laboratory simulation testing environment.The research provides guidance and reference for the research on GNSS high-precision receiver anti-multipath technology.