AMTD系统频域双参数恒虚警性能分析

Performance analysis of frequency domain BP-CFAR in AMTD systems

在机载雷达动目标检测系统中 ,用于目标检测的Doppler通道中的杂波剩余严重影响着系统检测性能。为在一定的虚警概率下提高系统的检测概率 ,针对抑制杂波后目标检测 Doppler通道存在 Rice分布干扰的情况 ,提出一种频域双参数恒虚警 (bi- parameter constant false alarm rate,BP- CFAR)处理方法。BP- CFAR处理方法分别在频域与距离域估计干扰的均方差与均值 ,取其线性组合作为各通道的检测判决门限。在频域存在杂波剩余的情况下 ,BP- CFAR与干扰的双参数分布相匹配 ,是统计意义下的最优检测器 ;与传统的单参数恒虚警处理方法相比 ,明显改善了系统的适应性和检测性能。

Clutter residue severely impacts the performance of airborne radar moving target detection (AMTD) systems. A Bi parameter constant false alarm rate (BP CFAR) method is proposed to improve detection while maintaining a low false alarm rate by analyzing clutter residue in Doppler channels. The disturbance in each Doppler channel is assumed to have a Rice distribution. The mean value is estimated by averaging in adjacent range cells and the mean square value is calculated by sorting and averaging in the frequency domain. The threshold is defined as the linear combination of the mean value and the mean square value. The distribution assumed by the BP CFAR method coincides well with the real disturbance distribution, so the method is statistically optimized. The system achieves high performance in AMTD systems with clutter residue.