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针对强杂波背景和有限训练样本数量条件下采用脉内编码压缩波形的MIMO阵列雷达目标检测问题,借鉴自适应波束形成技术中Capon最小功率估计器的相干源信号对消思想,提出了自适应脉冲压缩—Capon滤波器(简记为APC-Capon滤波器),并基于此滤波器的输出设计了一种CFAR检测器.理论分析和数值仿真均表明,该滤波器能够在执行非迭代自适应脉冲压缩并抑制各发射波形自相关距离旁瓣和互相关干扰的同时,实现杂波信号对消,即杂波抑制功能.检测性能仿真表明,尽管相同尺寸参数(包括发射阵元数、接收阵元数、脉冲编码位数、相参脉冲个数)条件下,所设计的基于APC-Capon滤波技术的CFAR检测器的性能不如训练样本数量充足时基于“匹配滤波+样本矩阵求逆(SMI)”技术的AMF检测器,但是随着尺寸参数的适当增大,前者的检测性能将逐渐超过后者在较小尺寸参数时的检测性能,且不显著增加计算复杂度和训练样本数量,而后者则因大尺寸参数时对计算复杂度和训练样本数量的需求过高而在实际中难以实现.仿真还表明,APC-Capon滤波器及其相应的CFAR检测器对发射波形的相关性(包括自相关性能和互相关性能)有一定的依赖性,但随着发射波形数量的增加,这种依赖性逐渐降低.
In order to solve the target detection problem of MIMO array radar using the compressed pulse with in-line coding under the conditions of strong clutter background and limited training samples, adaptive Adaptive Beamforming (CAPON) minimum power estimator is proposed to eliminate coherent source signals. Pulse compression -Capon filter (APC-Capon filter for short), and designs a CFAR detector based on the output of the filter.The theoretical analysis and numerical simulation show that the filter can perform non-iterative adaptive Pulse compression and suppression of the correlation between the sidelobes and cross-correlation of the emission waveforms from the autocorrelation distance, the clutter cancellation, that is, clutter suppression function.Experimental results show that although the same size parameters (including the number of transmitting elements, CFAP detector based on APC-Capon filtering technology is not as good as the training sample number based on “matching filter + sample matrix inversion (SMI) ) ”AMF detector, but as the size parameters increase properly, the former’s detection performance will gradually exceed the latter’s detection performance at smaller size parameters, and Which does not significantly increase the computational complexity and the number of training samples, while the latter is difficult to be implemented in practice due to the high computational complexity and the large number of training samples when large-size parameters are required.The simulation also shows that the APC-Capon filter and its corresponding The CFAR detector has some dependencies on the correlation of emission waveforms (including autocorrelation and cross-correlation), but this dependence decreases as the number of emission waveforms increases.