宽带雷达动目标的一种互相关系数累加检测器

Correlation-coefficient-summation detector for wideband radar moving targets

针对宽带雷达动目标检测问题,提出了一种在高斯噪声中的互相关系数累加检测器.宽带雷达动目标信号在距离频率域进行傅里叶变换取绝对值消除目标运动带来的相位项后,求互相关系数.利用相邻宽带雷达信号具有较大相关性这一特点,将多次相邻回波的互相关系数累加作为检测统计量.分析了高斯噪声互相关系数的概率分布,给出了检测门限设置方法.理论分析表明,互相关系数累加检测器具有恒虚警检测性能.计算机仿真试验表明,互相关系数累加检测器相比多普勒导向矢量已知的不依赖散射点分布密度的广义似然比检测器,在检测率为90%时有2dB的改善.

A correlation coefficient summation detector under the Gaussian noise for wideband radar moving targets are presented.Fourier transformation is carried out to take the absolute value for the signals of wideband radar moving targets in the range-frequency domain in order to remove the phase item caused by target moving,and then the correlation coefficient of conjoint signals are computed.By the property that the conjoint range spread target signals possess a high relativity,the summation of correlation coefficients is used for detect.After analyzing the probability of the echo signal without targets under the Gaussian noise, the detect threshold setting of the correlation coefficient summation detector is given and theoretical analysis shows that the detector possesses constant false alarm rate （CFAR） performance.Computer simulation shows that the correlation coefficient summation detector given in this paper can achieve 2 dB performance improvement than the non-scatterer density dependent generalized likelihood ratio test （NSDD-GLRT） detector with the known Doppler steering vector at the 90% detection.