艇载共形稀疏阵列天线雷达成像研究

基于平流层飞艇平台,研究了共形稀疏阵列天线雷达对静止目标成像及对运动目标探测的问题。针对三叶玫瑰线艇身模型,提出了共形稀疏阵列天线的布阵方式。雷达采用实孔径方式成像,各子阵同时发射多脉冲频分正交信号。利用各子阵多发多收的回波信号,采用后向投影(BP)算法完成各子带信号对静止目标的成像处理,再将子带信号成像结果相参累加以提高静止目标成像的距离向分辨率;将各子阵一发多收的多脉冲回波信号变换到距离-多普勒域,完成静止杂波抑制,对各子带信号采用压缩感知(CS)的方法在二维空间实现对运动目标图像的重建,再将子带信号重建结果非相参累加以提高运动目标探测的信噪比。仿真实验验证了本文方法的有效性。

Airship conformal sparse array radar imaging

Based on the stratospheric airship platform,the problems about stationary targets imaging and moving targets detection using conformal sparse array are investigated.A distribution scheme of the conformal sparse array is proposed for the airship with the trilobal roseline profile model.The real aperture imaging method is adopted by the radar.All the subarrays transmit multiple-pulse orthogonal frequency division signals simultaneously.The echo signals of multiple-input and multiple-output are used to achieve stationary targets imaging by the back projection(BP)algorithm for each sub band signal respectively.Then all these results are coherently accumulated to improve the range resolution.The multiple-pulse signals of single-input and multiple-output are transformed into the range-Doppler domain to achieve clutter suppression.The compressed sensing(CS)method is used to reconstruct the moving targets image in two-dimension for each sub band signal respectively.Similarly,all these results are incoherently accumulated to improve the SNR of moving targets detection.Simulation results demonstrate the validity of the method proposed in this article.