Along with the development of satellite navigation receiver, the software-defined receiver is becoming the trend of the next generation receiver for its agility. This article investigates the structure of software-defined receiver based on GPS and uses parallel-code method ground on Fast Fourier Transform to acquire satellite signal. Contemporarily, one code tracking-loop and carrier wave tracking-loop which are used in the receiver are designed based on analyzing the theory of basic phase-locked loop. An effective RAIM ( Receiver Autonomous Integrity Monitoring ) algorithm is designed under the requirement of autonomous FDI in GPS . By experiment, the receiver designed can preferably acquire and track the satellite signal even if it has some Doppler frequency. Besides, it can accurately demodulate the navigation data in signal and detect its integrality.%随着卫星导航接收机的发展,软件定义的接收机因其设计的灵活性成为下一代导航接收机的发展趋势.研究了基于GPS软件接收机结构方案；采用基于FFT的并行码相位搜索算法处理卫星信号的捕获问题；分析基本锁相环的原理,并设计可用于软件接收机的码跟踪环和载波跟踪环；根据GPS完好性的要求,设计GPS自主监测算法.实验表明,所设计的软件接收机能较好地对卫星信号进行捕获,可准确跟踪含有多普勒频移的载波,并能正确解调出导航数据,同时可对接收机的完好性进行监测.
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