Abstract: This paper introduces the basic structure of Global Navigation Satellite System(GNSS) software receiver, summarizes its advantages and realizes the whole system regarding GPS software receiver. Except it implements the intermediate frequent signal sampling module for the hardware part, the system is all carried out in software way, including intermediate frequency signal processing module, the signal acquiring and tracking module, ephemeris storage and conversion module, and single-point static positioning module aiming at pseudorange. The errors concerned in the system mainly contain satellite clock error, troposphere error, ionosphere error and the error caused by earth rotation. The result precision can reach 15 meters (95%), even 10 meters with good Geometric Dilution of Precision(GDoP) values. The entire system possesses friendly interface with fine flexibility and extensibility.

Key words: software receiver, cyclic correlation, pseudorange, ephemeris

摘要： 介绍全球导航卫星系统软件接收机的基本结构和优点，系统地实现了GPS软件接收机。该结构的硬件部分实现中频信号采样模块，软件部分实现可设置12通道的中频信号处理模块、信号捕获和跟踪、导航电文存储及转换，并针对伪距定位算法部分实现了单点静态定位，考虑的误差源主要包括卫星钟误差、对流层误差、电离层误差和地球自转引起的偏差。定位数据水平精度基本达到15 m(95%)，几何精度因子(GDOP)值较好的数据可达10 m。

关键词: 软件接收机, 循环相关, 伪距, 导航电文

CLC Number: 

• TP311.52