基于雷达回波的UWB SAR方向图校准  

Calibration of the antenna pattern of UWB SAR based on radar echo

作　　者：邹鲲[1] 康晓勇 梁甸农[1] 

机构地区：[1]国防科技大学电子科学与工程学院,湖南长沙410073 [2]湖北职业技术学院机电工程系,湖北黄冈438000

出　　处：《系统工程与电子技术》2005年第8期1329-1331,1335,共4页Systems Engineering and Electronics

基　　金："十五"国家部委基金资助课题(41307020203)

摘　　要：低频UWB SAR系统具有较大的方位向积累角,天线方向图非均匀性对系统性能的影响不能忽略。利用接收信号空间和场景空间的对应关系,结合成像模型定性地讨论了天线方向图对系统性能的影响。考虑了距离校正因子、杂波、噪声和目标散射特性等因素后,给出基于脉压回波的天线方向图估计和校正的方法,并用计算机仿真验证了该方法的有效性。The wide accumulating azimuth angle is one of the main characteristics of low frequency UWB SAR, so the effect of the antenna pattern on the system performance cannot be neglected. The relationship between the receiving signals and the scene backscattering coefficients is given, and the effect of the antenna pattern is discussed qualitatively with an appropriate imaging algorithm. Taking the range calibration factor, clutter, noise and target scattering characteristic into the consideration, the method of antenna pattern estimation and correction based on radar echo is proposed. The computer simulation is performed to prove the validity of this calibration method.

关 键 词：低频超宽带合成孔径雷达 天线方向图 校准 

分 类 号：TN958[电子电信—信号与信息处理]