Design and implementation of IF signal modulator for GNSS signal simulator
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摘要: GNSS(Global Navigation Satellite System)信号模拟器能够根据用户所设置的GNSS系统和信号形式、载体动态和环境参数,精确模拟出载体收到的卫星信号,这为GNSS系统级仿真试验和接收机的测试提供一种高效的工具.主要研究兼容多系统多频点的卫星信号模拟器中频信号发生器和数字信号处理技术,提出了数字合路与功率控制的方法和信号相位精确模拟的途径;在基于PCIE+DSP+FPGA+DAC架构的中频板卡上完成了与PC通信、波形控制参数计算和更新、基带信号调制以及模拟中频信号的产生;最后给出了与相应的GNSS接收机的对接结果,验证了所产生中频信号的正确性和信号质量.Abstract: Global navigation satellite system(GNSS) signal simulator can simulate satellite signals received by target receivers in high fidelity according to the signal structure, dynamics of the receiver and environmental parameters defined by users, which provides an effective way for both GNSS system-level simulation and receiver test. The research of GNSS IF signal generator and digital signal processing techniques of the simulator compatible with multi-systems and multiple carrier frequencies was mainly focused on. Approaches on digital signal synthesis, power control and accurate simulation of signal phase were proposed. Functions of communication with PC, calculation and updating of waveform controlling parameters, baseband signal modulation and generation of analog IF signal were implemented on the IF signal modulator based on the architecture of PCIE+DSP+FPGA+DAC. Test results from the corresponding GNSS receivers validate the accuracy and quality of signals generated by simulator.
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