实时动态精密单点定位中的多路径效应削弱方法

基于削弱实时动态精密单点定位多路径效应的目的,首先分析了多路径误差的产生原理,利用信噪比与高度角的关系判断多路径产生的来源,利用TEQC软件量化多路径误差的大小.其次分析了一般导航定位中的设置截止高度角法减少多路径效应在实时动态精密单点定位中的作用,试验表明这种方法并不适用于精密单点定位.基于Estimate SETC模型和Iono-Free LC对多路径效应对电离层改正的影响进行了研究,发现当多路径效应显著时,双频电离层改正会带来更大的误差,不利于精密单点定位的高精度解算.最后根据实际数据解算结果,在多路径效应显著的情况下,建议选用精确的模型改正消除电离层误差,而不使用双频消除电离层延迟法.

Mitigation of multipath effects in real-time kinematic precise point positioning

This paper investigates mitigating the multi path effect in real time dynamic PPP(Precise Point Positioning). First,the generation principle of mu lti path errors is analyzed,the source of multi path generation is determined by using the relationship between elevation angle and SNR(Signal to Noise Radi o), the size of multi path error is quantified by using TEQC software. Second, the role of setting cut off angle method to reduce multi path effects in real time dynamic PPP is discussed,test shows that this method is not applicable for PPP. By studying th e impact of the multi path effects on the ionosphere correction based on the Es timate SETC model and Iono Free LC, it is found that in s ignificant multi path effects condition, the dual frequency ionosphere correct ion will lead to greater error, which is not conducive to a high PPP precision solver. Fin ally,according actual data solver, in the significant multi path effect cases,the use of precise model correction is suggested to eliminate the io nosphere error,instead of using the dual frequency.