一种Strobe相关器及其多径抑制性能研究

Study on Multipath Mitigation Performance of Strobe Correlator

多径效应是GPS系统的重要误差源之一,严重影响DGPS的性能。分析了多径信号相关器模型,从鉴相器的鉴相函数入手,详细推导了Strobe相关器技术的码相跟踪误差与多径信号参数的函数关系,理论分析与仿真表明,Strobe相关器可以显著抑制多径效应引起的误差,优于一般的窄相关技术。结果也表明改进GPS接收机的相关器和鉴相器结构是抑制多径误差的一个有效方法。

Multipath remains a major source of positioning error in high precision DGPS applications.In this paper the correlation model under multipath signal is analysed and then the mathematic relation between code phase error and multipath paramters of strobe correlator is derived detailedly based on the discrimination function.Simulation results and analysis show that strobe correlator could enhance multipath mitigation performance than usual narrow correlator.The results also show that receiver-internal correlat...