基于稀疏综合孔径天线的艇载成像雷达研究  

Airship Imaging Radar Based on Aperture Synthesis of Thinned Array

作　　者：侯颖妮[1,2] 李道京[1] 尹建凤[1,2] 洪文[1] 

机构地区：[1]中国科学院电子学研究所微波成像技术国家重点实验室,北京100190 [2]中国科学院研究生院,北京100190

出　　处：《电子学报》2008年第12期2377-2382,共6页Acta Electronica Sinica

基　　金：微波成像技术国家重点实验室基金(No.9140C1903050804);国家自然科学基金(No.60772103);中科院创新基金(No.CXJJ-158)

摘　　要：基于稀疏综合孔径天线概念,研究了平流层飞艇载对地观测成像雷达系统中的重要问题.提出了稀疏阵时分多相位中心孔径综合方法,该方法使得综合后的相位中心在数量上和分布情况上与满阵天线相同,从而避免了稀疏阵旁瓣较高的问题;利用模拟退火算法对阵列进行了优化,以使实际使用的阵元最少;为提高系统作用距离,采用多频正交信号形成多发多收的工作模式,通过频率拼接提高距离分辨率;由于综合孔径天线阵列长度远小于场景宽度,系统采用了子孔径成像方法,并将曲线拟合和自聚焦处理相结合,解决了存在阵列形变误差时的精确成像问题.仿真结果表明了本文方法的有效性.Based on the concept of aperture synthesis sparse antenna, the imaging radar on the stratosphere airship for the earth observation is investigated. The multiple phase centre aperture synthesis method in time division mode is proposed to eliminate the high side lobes of sparse array. Using simulated annealing algorithm to optimize the location of antennas, so as to minimize the number of antennas used. To guarantee the power of transmitter and enhance range resolution, the multiple frequency orthogonal sig- nals have been used to achieve multiple-input and multiple-output function.For the length of array is far less than the scene width, the sub-aperture imaging method is adopted. The curve fitting and PGA（ Phase Gradient Autofocus ）algofithin have been combined to compensate army error. The simulation results denote the validity of the method proposed in the paper.

关 键 词：稀疏综合孔径天线 雷达成像 多频正交信号 阵列误差 平流层飞艇 

分 类 号：TN957[电子电信—信号与信息处理]