卫星导航系统模拟电路故障注入方法研究

针对卫星导航系统电路故障中的模拟畸变TMB故障的机理进行了理论分析和仿真，着重研究伪码的相关函数和功率谱。基于现场可编程门阵列(FPGA)和调制方式的特性，提出了伪码先振荡后量化的设计方式，重点探讨了其在FPGA上的实现方法，并对关键的IIR滤波器的实现进行了分析。结合自研的卫星导航系统模拟器平台实现故障注入，对故障信号的相关函数和定位结果进行测试。结果表明，在该设计系统中随着振荡频率和衰减系数的增大，对系统的定位影响越小。

Research on Fault Injection Method for Analog Circuit of Satellite Navigation System

The mechanism of analog distortion TMB fault in the circuit fault of the satellite navigation system is theoretically analyzed and simulated. In addition, the correlation function and power spectrum of pseudo code are analyzed. Based on the characteristics of Field-Programmable Gate Array (FPGA) and modulation mode, the design method of quantization after oscillation of the pseudo code is proposed. The paper focuses on its implementation on FPGA and analyzes the key technology of IIR filter. Then the correlation function of the fault signal and its influence on the positioning result are tested through the fault injection which is realized based on the self-research satellite navigation system simulator platform. The test results show that the larger the oscillation frequency and attenuation coefficient in the design system, the smaller the impact on the positioning of the system.