马申杨1，， 李雨谦2，
（ 1、 成都青铜科技,成都,611731； 2、 电子科技大学,成都,611731； ）
职称论文摘要： 在室内等弱信号环境里,多径效应是不可避免的。通常情况下,多径中的非直达信号被作为干扰消除。这会造成信号的损失。而利用多径效应,将不同路径上的信号做相移累积能够避免这种损失,而该方法被称为分集接收。为实现分集接收,需要对不同路径上的时间延迟进行估计。传统的估计方法基于二阶统计量,这对该统计量对高斯噪声敏感,因此在弱信号环境下性能较差。本文提出了一种基于循环谱的GPS信号时间延迟估计方法。循环谱对高斯噪声有很强的免疫力,因此能在弱信号环境下实现好的检测性能。同时为便于工程实现,本文提出的时延估计方法是基于最小方差准则迭代实现的。本文所进行的仿真验证了所提出方法的有效性。
关键词： 循环统计量,时延估计,室内GPS, 迭代运算
MA Shen-yang1,， LI Yu-qian2,
（ 1、 Chengdu Bronze Tech., Chengdu, 611731 ； 2、 Department of Computer, University of Noname, City 332211； ）
Abstract： Indoor GPS signal acquisition encounters multipath effect in most cases. Conventionally, the non-light of sight signal among the multiple paths is taken as the inference to be suppressed. The inference suppression strategy will cause damage to the signal to noise ratio at the receiver. To utilize the multipath effect, the signal at different paths can be added up which is called as time diversity reception of signal. To implement the diversity reception, we need to estimate the time delay of signal at each path. The conventional estimation method is based on the second order statistics which is sensitive to Gaussian noise. Thus, the performance of the conventional time delay estimation methods are not satisfying under severely multipath effect. In this paper, we propose a novel time delay estimation method which is based on cyclostatistics. Since Gaussian noise is not cyclostationary but the signal does, the novel method significantly outperforms the conventional ones. Furthermore, we design an iterative structure to implement the proposed estimation method. Simulation results illustrate effectiveness of this new method in this paper
Keywords： cyclostatistics, time delay estimation, indoor GPS,iterative computation
中国科技论文在线：马申杨，李雨谦. 基于循环统计量的卫星导航信号时延分集检测方法研究[EB/OL].北京：中国科技论文在线
