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基于稀疏阵列和码分正交信号,研究了机载雷达的空时自适应处理(STAP)技术,用于空中预警背景下的地面杂波抑制和运动目标探测。提出了稀疏阵列码分多相位中心孔径综合方法,采用正交编码信号实现多发多收,使综合后不同编码信号的相位中心在数量和分布情况上和满阵天线的相同,从而避免了稀疏阵列天线旁瓣较高的问题;在孔径综合的基础上,利用空时自适应处理方法完成杂波抑制,实现运动目标检测。仿真结果表明了本文方法的有效性。
Based on the sparse array and the orthogonal codes, the space-time adaptive processing (STAP) technology of airborne radar is studied, which is used to suppress ground clutter and detect moving targets in airborne warning background. A method of sparse array code-polyphase center-aperture synthesis is proposed. The orthogonal code signals are used to achieve multiple and multiple reception. After the synthesis, the phase centers of different coded signals are the same as the full-array antennas in terms of quantity and distribution, avoiding the sparse array Antenna sidelobes higher problems; based on the aperture synthesis, the use of space-time adaptive processing method to complete the clutter suppression, the realization of moving target detection. Simulation results show the effectiveness of the proposed method.