Research on narrow-band interference suppression in BDS signal for reducing useful signal loss
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摘要: 窄带干扰抑制的关键在于抑制干扰的同时尽可能地减少有用信号的损耗,论文基于时频域结合的干扰抑制方法,在完成频域干扰参数检测的基础上,重点针对影响干扰抑制效果和有用信号损耗的关键环节——无线冲激响应（IIR）陷波器的设计展开研究,根据零极点配置原理,通过理论研究和详细的推导分析,提出通过增加一对零极点,并结合理论计算确定极角与极径,在保证通带增益可控且过渡带对称的前提下,使陷波器得到更为陡峭的带阻特性,理论上可减少有用信号的损耗、提高抑制干信比. 与目前主流的时域最小均方算法（LMS）算法、基于快速傅里叶变换（FFT）的频域抑制算法和传统型时频域结合算法的仿真结果对比证明,提出的方法捕获峰噪比分别提升了53.47％、8.369％和5.907％,平均输出载噪比分别提升了5.1472 dB、2.0037 dB和0.5086 dB,在有效抑制干扰的同时,保留了更多的导航信号.Abstract: The key to narrow-band interference suppression is to suppress the interference while minimizing the loss of useful signals. Based on the time-frequency domain combined interference suppression method, and the completion of frequency domain interference parameter detection, this paper focuses on the key part of the interference suppression effect and useful signal loss-the design of the IIR notch filter. Based on the principle of zero-pole configuration, through theoretical research and detailed derivation analysis, it is proposed that by adding a pair of zero-poles and combining theoretical calculation to determine the polar angle and radius, the notch filter can obtain steeper band-stop characteristics on the premise of controllable pass-band gain and symmetrical transition band, which can theoretically reduce its usefulness. Compared with the current mainstream time-domain LMS algorithm, FFT-based frequency-domain-suppression algorithm and traditional time-frequency domain combination algorithm, simulation results show that the proposed method increases the peak-to-noise ratio by 53.47%, 8.369% and 5.907%, and the average output carrier-to-noise ratio by 5.147 2 dB and 2.003 7, and 0.508 6 dB respectively. More navigation signals are retained while effectively suppressing interference.
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