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中文摘要：
提出一种中频信号的软件仿真方法,通过对GPS L1C/A码信号的研究,分析GPS中频信号的数学模型。设计实现GPS中频信号仿真器,并以多普勒频率仿真、多径干扰仿真和噪声仿真为例对GPS中频信号进行仿真实验,为GPS软件接收机的设计与验证提供高效平台。在介绍GPS软件接收机原理的基础上,研究信号捕获、信号跟踪及导航电文解算的实现过程。将设计的GPS接收机的定位解算结果与NovAtel接收机实际测量结果进行比较。结果表明：软件接收机各功能模块算法正确,可以满足使用要求,具有良好的灵活性和可扩展性。
英文摘要：
The simulation method was proposed for intermediate frequency （IF） signals. Through study on GPS L1 C/A code signals, the mathematical model of GPS IF signal was analyzed. The GPS IF signal simulator was designed and implemented, which provided a highly efficient platform for the design and verification of the GPS software receiver. By using this simulator, simulation experiments of GPS IF signals were carried out, taking simulations of the Doppler frequency, multipath interference and noise jamming as examples. Implementation procedures of signal acquisition, signal tracing and navigation message demodulation were studied on the princi- ple of the GPS software receiver. By comparing the positioning results of the GPS software receiver designed in this paper with the actual results measured by a real NovAtel receiver, the algorithms of the functional units of the software receiver were verified. The results indicate that the software receiver can meet the operation requirements and has good flexibility and scalability.
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