相控阵MIMO随机多相码雷达高速目标探测

High-speed Target Detection Using Phased-array MIMO Random Polyphase Codes Radar

为解决传统单输入单输出雷达对高速目标不能进行长时间有效相参积累检测的问题,提出一种基于相控阵多入多出(MIMO)随机多相码雷达的高速目标探测方法。通过多路回波数据短时间相参并行处理,保证相参处理间隔内目标运动不超过半个距离单元,避免了目标距离走动引起的检测性能恶化。将发射阵列分成多个重叠的子阵,子阵内的相参处理提高了发射处理增益,子阵间的波形分集提高了角度分辨率,实现了对低信噪比高速目标距离和角度的无模糊估计。仿真结果证明了该方法的有效性。

To solve the problem that the traditional single-input single-output（SISO）radar is ineffective when detecting the high-speed targets using the long time coherent integration approach,a method based on the phased-array multi-input multi-output（MIMO）random polyphase codes radar is presented.By coherently processing multi-channel echoes in parallel within a short duration,the target motion can be controlled within half range units,and the detection performance degradation caused by the target range migration can be avoided.The transmitted array is divided into multi-overlapped subarrays.The transmitted processing gain is increased by coherent processing in each subarray.The angular resolution is improved by the waveform diversity between different subarrays.The range and angle of a high-speed target can be unambiguously estimated in the low signal-to-noise ratio.Simulation results varify the effectiveness of the proposed method.