一种基于距离多普勒二维联合的群目标分辨方法

A Raid Cluster Resolution Scheme Based on Joint Range-Doppler Processing

编队飞机由于间距很小 ,常规低分辨雷达无法直接从距离和方位上分辨架次 .本文提出一种基于距离—多普勒二维联合处理的群目标分辨方法 .发射线性调频脉冲信号 ,将观测时间内的若干次回波在距离维和多普勒维分别转换为单频信号的叠加 ,再联合距离 -多普勒二维信息估计协方差矩阵 ,用超分辨信源数估计算法———新的改进盖氏圆盘法分辨目标架次 .这种方法可以直接地给出判决结果 ,适用于各种飞行状态、低信噪比环境或波束驻留时间较短的情况 ,而且和重频参差工作模式相兼容 ,尤其适合中。

It is difficult for common low-resolution radar to distinguish multiple planes flying in a raid cluster using traditional radar signal processing techniques.A raid cluster resolution scheme is proposed based on joint range-Doppler processing.The transmitled signal used is linear frequency modulation (LFM) signal and the received signal within observation time is represented by the summation of multiple sinusoid signals in both range and Doppler dimension.The time-delay and Doppler information are used jointly to estimate the sample covariance matrix,and the final resolution algorithm is a high-resolution source number estimation method-the new modified Gerschgorin disk estimation (NMGDE) method.The proposed scheme can give the target number automatically,and adapts to all kinds of flying states,low signal noise ratio (SNR) or short dwell time,especially middle or high repetition frequency,owing to being compatible with resolving range ambiguity by repetition frequency irregularity.