接收机滤波器群时延对CAPS伪距测量影响的优化研究  

A Study of Pseudo-Range Errors Induced by Group Delays of Intermediate-Frequency Bandpass Filters in the CAPS

作　　者：余宜珂 杨剑青[1,3] 

机构地区：[1]中国科学院国家授时中心,陕西临潼710600 [2]中国科学院国家天文台,北京100012 [3]中国科学院大学,北京100049

出　　处：《天文研究与技术》2014年第4期356-361,共6页Astronomical Research & Technology

摘　　要：在中国区域定位系统(Chinese Area Positioning System,CAPS)中,带通滤波器是用户接收机的重要组成部分,对于宽频测距码来说,其群时延特性是测距的重要误差来源之一。分析了接收机码跟踪环路,给出相关函数估算测距偏差,对带通滤波器群时延开展仿真分析,并研究了改进接收机设计以优化群时延特性的方法。研究对GNSS接收机的射频和环路设计有一定借鉴意义。A Bandpass Filter （BPF） is an important component of the receiver in the Chinese Area Positioning System （CAPS）. Group delays, especially those of wide-frequency ranging codes, are among the major sources of pseudo-range measurement errors. In this paper we present certain analyses of the principle of tracking and processing code signals. We subsequently derive the theoretical formula of a pseudo-range error and describe simulations of effects of a BPF. Based on these we have studied an approach to optimize group delays to improve the design of the CAPS receiver. The results of our study can provide useful references for the design of the GNSS receiver.

关 键 词：中国区域定位系统(CAPS) 带通滤波器 接收机 群时延 测距 

分 类 号：TN96[电子电信—信号与信息处理]