PFDA阵列点状波束形成及干扰抑制特性研究

Dot-shaped beamforming and interference suppression analysis based on the PFDA

频率分集阵列(frequency diverse array,FDA)通过波束指向自由度的增加,为雷达系统在空间、时间以及频率控制等方面的性能提升提供了可能。针对现有文献中较少研究的平面FDA(planar FDA,PFDA)展开分析。首先,分析了PFDA阵列的阵列结构及接收信号处理机制,推导了PFDA阵列的线性增量-时变频偏增量。之后,在采用非线性频控函数的同时,将PFDA阵列划分为基于单边子阵、对称子阵以及交叉子阵的阵列结构,从而将一维FDA阵列的方向图解耦技术扩展到二维面阵。此外,研究了基于PFDA阵列的稳健波束形成技术。最后,仿真验证了本文结论的正确性。

The frequency diverse array(FDA)is able to increase the freedom of beamforming.This feature provides improvements in performance of radar in space,time and frequency control.This paper analyses the planar FDA(PFDA),which is less studied in the existing literature.At first,the array structure and received signal processing architecture of the PFDA analyzed.Then the time-variant offset of the PFDA is derived.Then the PFDA is divided into single-side subarray-based PFDA,symmetric subarray-based PFDA and cross subarray-based PFDA.And the nonlinear frequency offset is introduced into the array element to realize the range-angle decoupling of the beampattern.In addition,a robust beamforming technique based on the PFDA is performed.Finally,comparative simulation results validate the effectiveness of the proposed method.