等效载噪比评估全球导航卫星系统接收机误码率的适应性分析

摘要

等效载噪比是全球导航卫星系统接收机捕获、数据解调和跟踪性能的重要指标.近年来,研究人员取得大量以等效载噪比为指标的干扰影响分析研究成果,但鲜有等效载噪比适应性分析.为此,展开等效载噪比适应性研究.在推导单频干扰下接收机等效载噪比和误码率模型基础上,得出特定条件下等效载噪比评估数据解调性能失效的结论.同时,深入分析等效载噪比失效的机理,给出等效载噪比指标的适用条件.仿真实验验证了理论分析的正确性.%Effective C/N0(carrier-to-noise ratio) is an important index of GNSS (global navigation satellite system) receiver data demodulation and tracking performance.During past years, analysis of interferences effects on effective C/N0 have been put forward.However, effective C/N0 limits analysis hasn't been presented.Thus, effective C/N0 limits were analyzed.The theory model of effective C/N0 and BER (bit error ratio) were derived in the presence of CWI(continuous wave interference), and results show that effective C/N0 fails to evaluate data demodulation performance under specific condition.Then, the mechanism of effective C/N0 malfunction was elaborated and the application condition of effective C/N0 was presented.Finally, theory analysis is verified by simulations.