高频地波SIAR射频干扰距离域抑制方法

Study of suppressing RF interference by range processing in the coast-ship HF surface wave SIAR

针对多载频发射、单天线接收的岸-舰双基地高频地波综合脉冲孔径雷达,研究基于特征值分解的射频干扰抑制方法.在分析射频干扰特点的基础上,提出了快距离域的干扰抑制方法.该方法根据干扰快距离采样间的相关性,以干扰相关矩阵特征分解得到的特征向量为权系数来估计干扰,从而实现干扰对消.根据干扰慢距离采样特征即多普勒特点,提出了分别利用单个和全部通道采样估计干扰协方差矩阵的两种新方法,可以在保证训练样本数的同时降低对存储空间的要求.实验结果表明:快距离域处理和估计干扰协方差矩阵的两种新方法是可行和有效的,可以将干扰功率降至噪声水平.

To suppress the RF interference in the coast-ship bistatic HF surface wave SIAR,new techniques by eigenvalue decomposition（EVD） in the range domain are developed.Ascribed to the operation mode of multiple carrier frequencies and a single reception antenna,the interference in the radar is different from the conventional ones.Based on the correlation between the fast-range samples in a sweep number,a fast-range processing technique is proposed,which estimates the interference with the eigenvector of the interference correlation matrix as the weighting coefficient and takes the interference from the raw data.Furthermore,two new methods for estimating the covariance matrix are presented as well according to the Doppler feature of the interference.The techniques can reduce the requirement of memory capacity while providing enough training samples.Experimental results show the validity of the proposed techniques by the fast-range and slow-range processing.