CAJ | 학술논문

多径效应是卫星导航系统的主要误差源之一.在现有研究中,基于最大似然估计准则的方法被认为是最佳的径抑制技术,但是当存在多路信号且路径数量未知时,其计算尤为复杂.本文提出了一种基于FIR模型的多径抑制方法,用基准相关函数和最小均方误差准则对接收信号进行参数估计和多径信号对消.该方法具有实现简单,易于实时信号处理,计算量与多径路数无关等优点.仿真结果表明,其性能略优于基于最大似然估计准则的MEDLL(Multipath Estimating Delay Lock Loop)技术.
다경효응시위성도항계통적주요오차원지일.재현유연구중,기우최대사연고계준칙적방법피인위시최가적경억제기술,단시당존재다로신호차로경수량미지시,기계산우위복잡.본문제출료일충기우FIR모형적다경억제방법,용기준상관함수화최소균방오차준칙대접수신호진행삼수고계화다경신호대소.해방법구유실현간단,역우실시신호처리,계산량여다경로수무관등우점.방진결과표명,기성능략우우기우최대사연고계준칙적MEDLL(Multipath Estimating Delay Lock Loop)기술.
Multipath is one of main errors in GNSS. Among the existing research, the maximum-likelihood (ML) methods are regarded as the best to mitigate multipath but computationally complex, especially when there are many multipaths and the number of multipaths is unknown. A multipath mitigation technique based on FIR model is put forward. The reference correlation function and the minimum mean square error principle is used to estimate the parameters and eliminate the multipath of received signals. The method is provided with simple implementation and high real-time processing capability, and its computation complexity is independent of the amount of multipaths. Simulation results show that it is superior to the MEDLL (Multipath Estimating Delay Lock Loop) technique based on ML.