一种改进的自适应恒虚警检测器

为了解决传统自适应恒虚警检测器在多目标环境下检测性能下降的问题，对传统基于指数变换的恒虚警检测器 (Variability Index CFAR，VI-CFAR)的选择策略进行改进，提出了一种改进的自适应恒虚警检测器-VIHCES-CFAR。在杂波边缘环境下和多目标干扰环境下分别选择非均匀杂波估计恒虚警检测器 (Heterogeneous Clutter Estimating CFAR，HCE-CFAR)和交互式恒虚警检测器 (Switching CFAR，S-CFAR)进行处理，提高了多目标环境下的目标检测能力，有效避免了目标遮蔽的问题。实验结果表明，在检测概率为0.5的条件下VIHCES-CFAR的信噪比相对于SVI-CFAR低0.05dB，在多目标环境下检测概率为99.78%，在杂波边缘环境下检测概率控制在10-4左右，具有稳定的抗干扰能力和良好的虚警控制能力。并通过实测数据验证了VIHCES-CFAR检测器在解决目标遮蔽问题上的有效性。

An improved adaptive CFAR detector

In order to solve the problem of decreasing detection performance of traditional adaptive constant false alarm detector (CFAR) in multi-target environment, the selection strategy of traditional exponential transform-based CFAR (VI-CFAR) is improved. An improved adaptive constant false alarm detector VIHCES-CFAR is proposed. Heterogeneous Clutter Estimating CFAR (HCE-CFAR) and Switching CFAR (S-CFAR) are selected in Clutter edge environment and multi-object interference environment respectively, which improves the ability of target detection in multi-target environment and effectively avoids the problem of target masking. Experimental results show that the SNR of VIHCES-CFAR is 0.05dB lower than that of SVI-CFAR at the detection probability of 0.5, and the detection probability of VIHCES-CFAR is 99.78% in the multi-target environment, and the detection probability of VIHCES-CFAR is about 10-4 in the clutter edge environment. It has stable anti- interference ability and good false alarm control ability. The effectiveness of VIHCES-CFAR detector in solving the problem of target masking is verified by the measured data.