机载MIMO雷达3-CAP杂波抑制方法

3-CAP Clutter Suppression Method Research for Airborne Radar

针对机载雷达面临的杂波抑制问题,在考虑阵元误差、通道误差和杂波起伏等误差因素对杂波特性影响的基础上,建立了机载MIMO雷达杂波数学模型,提出了一种基于MIMO雷达体制下的空时自适应新方法——M3-CAP方法。对接收信号进行时域滤波,选取被检测通道与其2个相邻通道为一组,进行自适应处理。该方法通过MIMO技术与3-CAP方法的有效结合,将波形分集的优势扩展到3-CAP方法中,显著提高了雷达系统自由度和杂波协方差矩阵估计精度。通过对不同雷达体制以及不同误差条件下杂波抑制性能的分析比较,结果表明:提出的M3-CAP方法的杂波抑制性能明显优于JDL-GMB、改进的JDL、3-CAP等方法。

To solve the problem of clutter suppression faced by airborned MIMO radar,after considering the element error,channel uncertainty as well as clutter fluctuation,,the clutter model for airborne MIMO radar under different error conditions is established,a new space-time adaptive processing method based on MIMO systems-M3-CAP method is proposed.Firstly,temporal filtering is performed on the space-time received data,and then the output data of three Doppler channels which are the detected Doppler channel and two of its adj acent channels,is adaptively filtered .By combining MIMO systems and 3-CAP method effectively,the advantage of waveform diversity is extended into 3-CAP method,this new method improves the degree of freedom and clutter estimation accuracy.By analyzing and comparing the clutter suppression performance under different radar systems and different error conditions,the result turns out：the clutter suppression performance of M3-CAP method is superior to JDL-GMB、Modified JDL、3-CAP methods.