多径信号对卫星接收机的影响及时域抑制算法研究

Influence of multipath signal on satellite receiver and research on time domain suppression algorithm

针对卫星导航系统多径误差问题,建立了多径效应模型,采用二象限反正切鉴相函数和EML鉴相器,在多径环境下分析了载波跟踪环和伪码跟踪环受到的影响。在抑制多径算法方面采用MEDLL和WRELAX算法抑制多径信号并进行仿真,并就两种算法对多径信号抑制的性能进行对比分析。实验表明,不同的多径信号对接收机的影响不同,对接收机解算真实信号造成的影响程度不同。在抑制多径方面,WRELAX算法要比MEDLL算法的抑制多径信号效果更好,估计误差更小。

Aiming at the multipath error problem of satellite navigation system,a multipath effect model is established,and the influence of carrier tracking loop and pseudo-random code tracking loop in multipath environment is analyzed by using two quadrant arctangent phase discriminator and EML phase discriminator.In the aspect of multipath suppression algorithm,MEDLL and WRELAX algorithm are used to suppress multipath signals and simulated,and the performance of the two algorithms for multipath signal suppression is compared and analyzed.The experiment shows that different multipath signals have different effects on the receiver and have different degrees of influence on the receiver to solve the real signal.In terms of multipath suppression,WRELAX algorithm is better than MEDLL algorithm in suppressing multipath signals,and the estimation error is smaller.