基于柱形抛物面天线的MIMO SAR研究

为了实现星载合成孔径雷达(SAR)的高分辨率宽测绘带成像，该文提出一种基于柱形抛物面天线的多发多收合成孔径雷达系统(MIMO SAR)。根据对系统结构和短偏移正交(STSO)发射波形的分析，该文给出该系统的具体处理方法。基于柱形抛物面天线易于在俯仰向形成高增益窄波束的优势，该系统能够利用数字波束形成技术对不同波形回波数据进行有效分离，从而获取更多的方位向等效相位中心。通过方位向多通道数据重构处理，成像场景回波数据可利用传统成像算法进行成像。仿真结果表明，该系统能够确保MIMO SAR的成像质量，并具有良好的成像性能。

Investigation on Parabolic Cylinder Reflector Based MIMO SAR

To realize the high-resolution wide-swath mapping capability of spaceborne SAR, this paper presents a parabolic cylinder reflector based MIMO SAR system. According to the analysis of system configuration and Short-Term Shift-Orthogonal (STSO) transmitting waveforms, the specific processing method are elaborated. Taking advantage of parabolic characteristics in elevation, the narrow beams with high gain can be easily realized by the parabolic cylinder reflector. This facilitates the efficient separation of STSO transmitting waveforms by using the digital beam-forming technique, therefore, more azimuth equivalent phase centers can be obtained. After the multichannel reconstruction processing in azimuth, the echo signals from illuminated scene can be imaged by conventional imaging algorithms. The simulation results show that, the proposed system has satisfactory performance for MIMO SAR imaging.