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为满足对GPS软件接收机和深组合导航研究的需要,开展了基于FPGA的实时GPS中频数字信号模拟器的研制。通过对GPS中频信号模拟器系统架构的分析,提出由计算机完成信号处理、FPGA完成数字调制、以太网完成调制信号输出的系统实现方案。使用SignalTapII和Matlab对系统的关键环节进行了测试和分析。GPS软件接收机对系统的测试结果表明,GPS信号模拟器工作稳定,满足GPS软件接收机测试的需要。
In order to meet the need of GPS software receiver and deep integrated navigation research, a real-time GPS intermediate frequency digital signal simulator based on FPGA was developed. Based on the analysis of GPS intermediate frequency signal simulator system architecture, this paper proposes a system implementation scheme that computer completes signal processing, FPGA completes digital modulation, and Ethernet completes modulation signal output. The use of SignalTapII and Matlab on the key aspects of the system were tested and analyzed. GPS software receiver test results of the system show that the GPS signal simulator is stable and meets the needs of GPS software receiver test.