相干频率分集阵雷达匹配滤波器设计

Design of matched filter for coherent FDA radar

相干波形频率分集阵(frequency diverse array,FDA)雷达通过引入阵元间的频率差异,在观测空间中形成距离-角度-时间依赖的发射方向图。针对相干FDA雷达体制回波接收处理的问题,提出了角度-时间二维匹配滤波器,同时实现了快时间波形匹配和等效发射波束形成,不同于传统匹配滤波器。并进一步考虑某些应用情况下,通过设计匹配时间窗,提出了分段匹配的二维匹配滤波接收处理方法。将雷达脉冲时间划分为多个子脉冲接收时间窗,并采用发射方向图调制的角度-时间二维匹配滤波函数对回波信号进行相干积累。仿真实验给出了所提接收处理方法的性能验证。

Frequency diverse array （FDA） radar transmitting coherent waveforms employs frequency increment between the array elements. It is capable of providing rangeangletimedependent transmit beampattern. Aiming at the receiving processing of such coherent FDA radar, a two dimensional angletime matched filter is proposed, which is capable of performing matched filtering in fasttime domain and realizing equivalent transmit beamforming. This is different from the traditional matched filtering process. Moreover, a partially matched filtering approach in angletime domain is devised by considering some particular applications. By dividing the whole pulse duration into several subpulses, the received echo is processed by the angletime matched filter modulated by the transmit beampattern. Simulation examples are provided to demonstrate the effectiveness of the proposed approaches for the coherent FDA radar.