弹载雷达自聚焦单脉冲前视成像

Autofocus Monopulse Forward-looking Imaging of Missile Borne Radar

摘要:

针对合成孔径雷达与多普勒波束锐化技术无法实现弹载雷达平台前视区域成像的问题，提出了一种单脉冲前视成像方法，介绍了其信号处理流程。该方法在成像过程中引入了单脉冲技术，实现了前视区域二维高分辨成像；在此基础上，针对实际鉴角曲线与理论曲线存在误差导致成像结果出现方位向“散焦”的问题，提出了一种采用回波数据作为样本估计鉴角曲线的自聚焦算法；最后设计了暗室实验验证系统,完成了自聚焦单脉冲前视成像实验。仿真和实验结果表明，所提的自聚焦单脉冲前视成像方法能够有效缩小目标成像的方位向宽度，目标的方位向成像剖面宽度约可缩小至波束宽度的1/9。

Abstract:

A monopulse forward-looking imaging method was proposed to address the issue of the inability of synthetic aperture radar (SAR) and Doppler sharpening technology to achieve the imaging on the front of missile borne radar, and its signal processing flow was introduced. The method introduced the monompulse technology in the imaging process to achieve two-dimensional high-resolution imaging in the forward-looking area. Based on this, to address the problem of azimuth defocusing in imaging results caused by errors between the actual and theoretical angle detective curves, an autofocus algorithm was proposed that used echo data as samples to estimate the angle detective curve. Finally, the darkroom experiment system was designed to complete the autofocus monopulse forward-looking imaging processing. Simulation and experiment results show that the proposed mothed of autofocus monopulse forward-looking imaging can effectively reduce the azimuth width of the target image, and the azimuth image profile width of the target can be reduced to about 1/9 of the beam width.