论文部分内容阅读
多径干扰是影响GNSS定位精度的主要误差源之一,从多径信号特征入手,分析了多径干扰对载波环和码环的影响,并研究了矢量跟踪环路(VTL)对多径的抑制性能。通过对比分析VTL和标量跟踪环路(STL)的环路结构,建立了线性化的系统模型,推导了码相位测量误差对VTL的影响。在VTL中,未受多径影响的通道辅助受干扰的通道,削弱多径带来的定位误差。通过仿真对比分析了一个和多个通道受多径干扰时,多径对VTL和STL的影响,结果表明,受多径干扰的通道数越少,VTL相对于STL抑制多径性能越好,当所有通道都受多径干扰时,VTL定位精度不差于STL。
Multi-path interference is one of the main error sources that affects the positioning accuracy of GNSS. Based on the characteristics of multipath signals, the influence of multipath interference on carrier and code rings is analyzed. The effects of vector tracking loops (VTL) on multipath Inhibit performance. By comparing and analyzing the loop structure of VTL and scalar tracking loop (STL), a linearized system model is established and the influence of code phase measurement error on VTL is deduced. In a VTL, a channel that is not affected by multipath assists in the corrupted channel, weakening the positioning error caused by multipath. The effects of multipath on VTL and STL when one or more channels are affected by multipath interference are analyzed by simulation. The results show that the fewer channels are affected by multipath, the better the multipath performance of VTL relative to STL is. When When all channels suffer multipath interference, the VTL positioning accuracy is not worse than STL.