舰载无源综合脉冲孔径雷达干扰抑制

Interference Suppression for Ship-Based Passive Synthetic Impulse and Aperture Radar

该文对舰载无源综合脉冲孔径雷达工作中的射频与非平稳多径干扰性质进行了分析。在此基础上,根据射频干扰相关性质,使用拉伸处理后部分正距离单元和所有负距离单元内的回波数据,利用距离余弦加权估算待检单元内射频干扰统计特性,然后根据干扰功率强于雷达回波的先验信息,对待检单元回波进行特征分解后滤除干扰成分。同时,针对多径传播产生的非平稳干扰,在保持海杂波主成分统计特性不变条件下,通过构造空域与快时间域的二维滤波器对非平稳干扰进行抑制。最后,实测数据结果表明了分析与方法的正确有效性。

Interference statistic characteristics are analyzed in ship-based passive synthetic Impulse and Aperture Radar （SIAR）. After estimating covariance matrix at range bin interested using data from some positive and all negative frequency bins with cosine weights, eigen-decomposition is applied to interested data for co-channel interference suppression provided that its power is stronger than target echoes. Meanwhile, improved suppression approach to nonstationary interference from multipath propagation is proposed by forming adaptive STAP in fast-time domain and maintaining slow-time statistical properties of the first order sea clutter output approximately unperturbed by filter fluctuation. Analysis and suppression approach are verified by real data.