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

Limits analysis of effective carrier-to-noise ratio in evaluating bit error ratio of global navigation satellite system receiver

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/N_0（ 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/N_0 have been put forward. However,effective C/N_0 limits analysis hasn＇t been presented. Thus,effective C/N_0 limits were analyzed. The theory model of effective C/N_0 and BER（ bit error ratio） were derived in the presence of CWI（ continuous wave interference）,and results show that effective C/N_0 fails to evaluate data demodulation performance under specific condition. Then,the mechanism of effective C/N_0 malfunction was elaborated and the application condition of effective C/N_0 was presented. Finally,theory analysis is verified by simulations.