机载单通道雷达实波束扫描的前视探测  

Forward-looking Detection for Airborne Single-channel Radar with Beam Scanning

作　　者：杨志伟[1] 贺顺[1,2] 廖桂生[1] 

机构地区：[1]西安电子科技大学雷达信号处理国防科技重点实验室,陕西西安710071 [2]西安科技大学通信学院,陕西西安710054

出　　处：《航空学报》2012年第12期2240-2245,共6页Acta Aeronautica et Astronautica Sinica

基　　金：国家自然科学基金(60901066);国防预研基金(914xxx001);教育部博士点新教师基金(20090203120006);长江学者和创新团队发展计划(IRT-0954)联合资助~~

摘　　要：针对机载单通道雷达采用合成孔径雷达(SAR)技术、多普勒波束锐化(DBS)技术等途径难以实现载机飞行路线正前方高分辨率成像问题,研究了一种利用方位实波束重叠扫描的新型机载单通道雷达前视探测方法,讨论了提高方位分辨率的可行性和适用条件。该方法根据目标回波强度受到波束扫描增益调制的特点,通过计算修正的Capon空间谱来实现方位超分辨。模拟实验表明,所提方法能够实现机载单通道雷达的前视成像,可以显著提高波束主瓣区域内强弱临近目标的分辨能力。Traditional side-looking synthetic aperture radar （SAR） and Doppler beam-sharpening （DBS） technologies cannot generate images of the areas in flight direction with high azimuth resolution. To alleviate this problem, an innovative ap- proach based on real-beam scanning is presented. Moreover, both the feasibility and the applicable conditions of azimuth su- per-resolution are discussed. According to the model of echoes in which receiver power is modulated by beam gain, a modi- fied Capon algorithm is employed to calculate the spatial spectrum. Numerical simulation indicates that it can achieve for- ward-looking imaging for an airborne single-channel radar, and its performance is better than that of Capon when strong sig- nals and weak signals are in co-existence.

关 键 词：合成孔径雷达 多普勒波束锐化 前视成像 波束扫描 超分辨 

分 类 号：V243.2[航空宇航科学与技术—飞行器设计] TN911.2[电子电信—通信与信息系统]