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空时自适应处理(STAP)是机载预警雷达抑制杂波和干扰的一项关键技术,而多普勒三通道联合自适应处理(3DT)是适合工程实现的降维(RD)STAP方法。STAP目标检测后还需进一步估计目标的角度参数,因此将自适应单脉冲(AM)技术引入3DT,提出了一种高精度联合估计目标速度与方位空间角的空时自适应单脉冲算法。理论分析与仿真实验结果表明,当目标多普勒频率偏离检测多普勒单元中心频率时,该算法能同时减少目标多普勒跨越损失和空时导引矢量失配损失,进而提高输出信杂噪比(SCNR),改善目标测角精度。
Space-time Adaptive Processing (STAP) is one of the key technologies to suppress clutter and jamming of airborne early warning radars. Doppler three-channel joint adaptive processing (3DT) is a dimensionally reduced (RD) STAP method that is suitable for engineering implementation. After the STAP target detection, the target angle parameters need to be further estimated. Therefore, adaptive single pulse (AM) technology is introduced into 3DT, and a space-time adaptive single-pulse algorithm for joint estimation of target velocity and azimuth space angle is proposed. Theoretical analysis and simulation results show that when the target Doppler frequency deviates from the center frequency of Doppler detection, this algorithm can reduce the target Doppler cross-over loss and space-time steering vector mismatch loss, and then improve the output signal miscellaneous Noise Ratio (SCNR) to improve the accuracy of the target angle measurement.