一种高分辨率雷达海上目标自适应检测器

针对海上目标因波浪起伏和转向等导致的姿态变化引起的散射点起伏问题,在未知协方差矩阵的复高斯噪声背景下,研究了高距离分辨率雷达的距离扩展目标自适应检测问题.利用与待检测单元具有相同协方差矩阵结构的辅助教据估计未知噪声协方差矩阵,基于两步法检测策略获得了自适应检测器.恒虚警率特性分析表明,该检测器对不同噪声背景均具有很好的自适应特性.检测性能分析表明,该检测器对不同的目标模型具有很好的鲁棒性,且能有效避免“坍塌损失”.另外,通过增加传感器个数,可有效提高检测器性能.

A Marine Target Adaptive Detector for High Resolution Radar

In the high resolution radar scenarios,the variations of attitude angle of marine target result in the fluctuations of scatterers in different range cells.The adaptive detection of range-spread target in complex G aussian clutter with unknown covariance matrix is investigated.The adaptive detector is obtained based on two-step detection strategy.The unknown covariance matrix is replaced by the appropriate estimate from the secondary data,which possess the same covariance matrix structure as the range cells under test.The analyses of constant false alarm rate property show that this detector is totally adaptive to various noise backgrounds.The detection performance assessment shows that this detector performs robustly for different target scattering models and can avoid the collapsing loss effectively.In addition,the detection performance can be improved by increasing the number of sensors.