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OTHR Impulsive Interference Suppression in Strong Clutter Background

机译:强杂波背景下的OTHR脉冲干扰抑制

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摘要

External interferences can severely degrade the performance of an Over-the-horizon radar (OTHR), so suppression of external interferences in strong clutter environment is the prerequisite for the target detection. The traditional suppression solutions usually began with clutter suppression in either time or frequency domain, followed by the interference detection and suppression. Based on this traditional solution, this paper proposes a method characterized by joint clutter suppression and interference detection: by analyzing eigenvalues in a short-time moving window centered at different time position, clutter is suppressed by discarding the maximum three eigenvalues at every time position and meanwhile detection is achieved by analyzing the remained eigenvalues at different position. Then, restoration is achieved by forward-backward linear prediction using interference-free data surrounding the interference position. In the numeric computation, the eigenvalue decomposition (EVD) is replaced by singular values decomposition (SVD) based on the equivalence of these two processing. Data processing and experimental results show its efficiency of noise floor falling down about 10-20 dB.
机译:外部干扰会严重降低超视距雷达(OTHR)的性能,因此在强杂波环境中抑制外部干扰是目标检测的先决条件。传统的抑制解决方案通常从时域或频域的杂波抑制开始,然后是干扰检测和抑制。在此传统解决方案的基础上,本文提出了一种联合杂波抑制和干扰检测的方法:通过分析以不同时间位置为中心的短时移动窗口中的特征值,通过在每个时间位置丢弃最大的三个特征值来抑制杂波。同时通过分析不同位置的剩余特征值来实现检测。然后,通过使用围绕干扰位置的无干扰数据进行向前-向后线性预测来实现恢复。在数值计算中,基于这两个处理的等效性,将特征值分解(EVD)替换为奇异值分解(SVD)。数据处理和实验结果表明,其本底噪声效率下降了约10-20 dB。

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