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Computationally Efficient Narrowband RFI Mitigation for Pulse Compression Radar

机译：脉冲压缩雷达的高效计算窄带RFI缓解

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摘要

Mitigating in-band, continuous-wave (CW) radio frequency interference (RFI) is a common problem for radar systems which themselves may employ continuous-wave waveforms. The source of this RFI can be intentional or unintentional spectral artifacts of near-by narrowband communications systems. Radar signal modulations of just a few megahertz are frequently quite broad compared to the modulation bandwidths of the interferers. So, characterization of RFI by a simple tone can be sufficient to assess its impact. When the RFI sources are unanticipated or of uncertain characteristics, there is motivation to mitigate them in a responsive manner in receive processing. A computationally efficient RFI cancellation method for receive is described here. Salient properties of this method are the recovery of radar sensitivity in the presence of narrowband RFI and the preservation of pulse compression time sidelobe levels. In fact, the technique described here overcomes the disadvantages of isolating and removing an RFI source that is completely immersed in the radar waveform in both time and frequency. While removing each of possibly multiple RFI sources with surgical IIR filters, little secondary influences on pulse compression responses arise because the IIR filter is suitably designed with finite word influences and impulse-response time sidelobes in mind.
机译：对于本身可能采用连续波波形的雷达系统，减轻带内连续波（CW）射频干扰（RFI）是一个普遍的问题。该RFI的来源可能是窄带通信系统附近的有意或无意的频谱伪像。与干扰源的调制带宽相比，仅有几兆赫兹的雷达信号调制通常相当宽泛。因此，用简单的音调表征RFI足以评估其影响。当RFI源意外或特性不确定时，就有动机在接收处理中以响应方式缓解它们。这里描述了一种用于接收的计算有效的RFI消除方法。该方法的显着特性是在存在窄带RFI的情况下恢复雷达灵敏度，并保留脉冲压缩时间旁瓣电平。实际上，这里描述的技术克服了在时间和频率上隔离和去除完全浸入雷达波形的RFI源的缺点。在用外科手术IIR滤波器去除可能的多个RFI源中的每一个时，由于IIR滤波器的设计适当考虑了有限的字影响和脉冲响应时间旁瓣，因此对脉冲压缩响应的影响几乎没有增加。

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