凝视数字多波束合成孔径雷达系统性能分析  

System performance analysis of staring digital multiple beam synthetic aperture radar

作　　者：江涛[1] 陈翼[1] 王盛利[1] 

机构地区：[1]南京电子技术研究所,江苏南京210039

出　　处：《系统工程与电子技术》2013年第4期745-752,共8页Systems Engineering and Electronics

基　　金：中国电子科技集团公司科技创新基金资助课题

摘　　要：针对传统合成孔径雷达(synthetic aperture radar,SAR)在实现远距离高分宽幅成像中存在的问题,提出了凝视数字多波束SAR的概念。凝视数字多波束SAR将成像区域在距离和方位向分割为多个子区域进行独立成像,避免传统SAR在高分宽幅成像中的限制;利用完整天线口径和数字波束形成(digital beam-forming,DBF)技术,形成方位向和俯仰向多个高增益的接收窄波束,并控制接收波束对每个子区域进行凝视观测,延长成像时间,提升分辨率。根据上述基本原理,通过对凝视数字多波束SAR的建模,完成对成像系统的性能分析。数值仿真表明,凝视数字多波束SAR系统不仅可以实现高分宽幅成像,具有良好的成像性能,而且可以通过增加天线增益,降低系统发射功率,扩展了SAR的应用领域。An innovative concept of staring digital mutttpie oeam by^lLL,~ ~＂ ted for overcoming the shortcoming of traditional SAR in long-range high-resolution wide-swath imaging. The new imaging concept can avoid the restriction in the traditional one by dividing the imaging area into several subpatches to image independently. In addition, the digital beam-forming （DBF） technology and the whole elements of aperture are employed to form and control multiple receiver beams in elevation and azimuth. The receiver ones are used to achieve the staring observation of each subpatch, which can extend the time of imaging and improve the resolution. The system model is built to analyze the performance of imaging. The simulation shows that the staring digital multi-beam SAR can not only achieve the high-resolution wide-swath imaging with great performance, but also reduce the transmitter power by enlarging the aperture of antenna, which can extend the application of SAR.

关 键 词：高分宽幅 合成孔径雷达 数字波束形成 凝视观测 

分 类 号：TN959.73[电子电信—信号与信息处理]