导航卫星仿真信号控制精度测试与评定

Accuracy Control Test and Assessment for Signal Simulation of Navigation Satellites

对于高性能的全球导航卫星系统(GNSS)信号仿真器,必须保证卫星导航仿真器产生信号的准确性,否则将无法将其作为标准信号源来对卫星导航终端进行PVT(位置、速度、钟差)精度标定等定量测试和评估。但目前该领域内还没有一个统一的或让人信服的测试方法。针对此问题,通过分析卫星信号仿真器的几个重要指标(伪距各阶变化率、闭环延时)的特征,试图从理论和工程角度给出相关的测试方法,获取准确的仿真器指标,为用户提供一个可信、可控的指标依据。实验结果表明该方法有效。

For high-performance GNSS signal simulators,the accuracy of the generated signal must be guaranteed firstly,otherwise the simulator can not be used as a standard signal source to test and evaluate accuracy calibration of PVT of satellite navigation termi- nal. However,up to now in this field,there isn＇t a uniform and convincing test method. To solve this problem, this paper analyzes the characteristics of several important indexes of satellite signal simulators （ the pseudo-range change rate at different orders,the closed- loop delay） , and puts forward, from the theoretical and engineering perspective, relevant test methods to obtain accurate simulator inde- xes so as to provide users a trust-worthy and controllable index reference. The experiment results have proved the validity of the test methods.