Effects of narrowband and pulse interference on the carrier-to-noise ratio of satellite navigation signals
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摘要: 现代电磁环境日趋复杂，导航接收机受到各式各样干扰的风险越来越高，窄带干扰和脉冲干扰就是对卫星导航信号常见的压制干扰手段. 不同的干扰信号具有不同的时频域特征，对卫星导航信号造成的影响也有很大差异，这种影响主要体现在信号的载噪比和误码率等方面. 针对目前国内脉冲干扰的性能研究不足的现状，通过对比窄带干扰性能评估方法提出了适应于脉冲干扰的抗干扰品质因数计算公式. 推导了脉冲干扰下在时域计算信号等效载噪比的方法，并对推导结果做了仿真验证，结果表明：不同占空比的脉冲干扰下，等效载噪比计算误差小于0.5 dB，结果较为准确.Abstract: With the increasing complexity of modern electromagnetic environment, navigation receiver is at higher risk of various interference. Narrowband interference and pulse interference are common means of suppressing interference on satellite navigation signals. Different interference signals have different time-frequency domain characteristics, and their influence on satellite navigation signals is also very different, which is mainly reflected in the carrier-to-noise ratio and bit error rate. In view of the lack of research on pulse interference performance in China, a formula of anti-interference quality factor suitable for pulse interference is proposed by comparing narrowband interference performance evaluation method. This paper deduces the method of calculating the equivalent carrier-to-noise ratio in time domain under pulse interference, and verifies the result through simulation. The result shows that the calculation error of equivalent carrier-to-noise ratio under pulse interference with different duty ratio is less than 0.5 dB, and the result is quite accurate.
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表 1 等效载噪比理论结果与仿真结果对比表
占空比/% BPSK(1)理论值/（dB·Hz） BPSK(1)仿真值/（dB·Hz） BPSK(10)理论值/（dB·Hz） BPSK(10)仿真值/（dB·Hz） 10 40.08 40.53 43.77 44.07 15 37.84 38.06 42.82 43.00 20 36.08 35.71 41.88 42.27 
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