外辐射源雷达模糊函数副峰抑制算法研究

外辐射源雷达模糊函数副峰可能会导致检测虚警及弱小目标遮蔽.为抑制模糊函数副峰,提出了一种基于广义旁瓣对消结构的接收机滤波器设计方法,得到了广义旁瓣对消滤波器的闭式解,定量分析了该方法的信噪比损失,指出了副峰高度等因素与信噪比损失的关系.为避开滤波器设计中的高维矩阵求逆运算,提出了快速实现方法.理论分析及基于实测数据的数值计算结果表明,算法能将模糊函数副峰抑制到任意高度,且具有最小的信噪比损失.

Ambiguity Function Side Peaks Suppression for Passive Radar

The side peaks of the ambiguity function of the passive radar will lead to false alarms in detection and the mask of weak targets.We proposed a method to suppress the side peaks of the ambiguity function based on generalized sidelobe canceller(GSC)and derived the closed form expression of the GSC-based filter.Moreover, we analyzed the signal to noise ratio(SNR)loss of the proposed filter as well as the relationship between the heights of the side peaks and the SNR loss.In order to avoid the inversion of high dimensional matrices, we also proposed a fast implementation of the proposed filter design.Both theoretical and numerical results based on real data show that, the proposed method can suppress the side peaks to arbitrary level with minimum SNR loss.