相干频率分集阵雷达匹配滤波器设计

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。

Design of matched filter for coherent FDA radar

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.