基于MVDR波束形成的FDA平台外干扰抑制

针对频控阵(frequency diverse array, FDA)在对与目标位置相近的平台外干扰进行抑制时, 传统FDA与非线性频偏结合不能实现距离-角度去耦合、对数递增FDA主瓣展宽较大和汉明窗加权FDA距离维旁瓣过高的问题, 在充分研究汉明窗加权的线性FDA(Hamming linear FDA, HL-FDA)方案的基础上, 对4种频偏方案的性能进行了分析, 提出采用FDA多输入多输出结构代替传统的一维均匀线性FDA结构, 通过结合最小方差无失真响应(minimum variance distortion free respinse, MVDR)准则, 将HL-FDA应用到MVDR自适应波束形成层面, 对平台外干扰进行抑制。仿真验证了HL-FDA在结合MVDR自适应波束形成算法后能有效地对抗距离-角度二维平台外干扰。

FDA platform external interference suppression based on MVDR beamforming

For the frequency diverse array (FDA) to suppress the interference near the target position outside the platform, the combination of traditional FDA and nonlinear frequency offset cannot achieve range-angle decoupling, logarithmic increasing FDA main lobe broadening and Hamming window weighted FDA range dimension sidelobe too high. Based on the full study of the Hamming window weighted linear FDA (HL-FDA) scheme, the performance of four frequency offset schemes is analyzed, and the frequency diverse array multiple-input multiplt-output structure is proposed to replace the traditional one-dimensional uniform linear FDA structure. By combining the minimum variance distortion free response (MVDR) criterion, the HL-FDA is applied to the MVDR adaptive beamforming level to suppress the platform external interference. The simulation results show that the HL-FDA can effectively counter the range-angle two-dimensional platform external interference combined with the MVDR adaptive beamforming algorithm.