一种基于SPECAN卷积的聚束式SAR宽场景高分辨成像算法  

Algorithm for Wide Swath and High Resolution Spotlight SAR Imaging Based on SPECAN Convolution

作　　者：张士明[1] 计科峰[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《现代电子技术》2010年第19期35-38,共4页Modern Electronics Technique

摘　　要：针对聚束式SAR成像,提出了一种基于谱分析(SPECAN)卷积的宽场景高分辨成像算法。该算法主要利用SPECAN卷积对回波方位实现了多普勒去模糊,推导二次相位补偿项,可实现信号支撑区相干性恢复。利用SPECAN卷积和相位补偿实现了信号二维频谱解模糊,同时保持了相位规律,所以可利用高精度的距离徙动算法(RMA)实现高分辨聚焦。区别于传统的聚束式SAR成像算法,基于SPECAN卷积的算法不引入近似,可应用于大场景高分辨聚束成像。仿真试验验证了该方法的有效性和优越性。A novel algorithm for wide swath high resolution spotlight SAR imaging based on spectral analysis algorithm （SPECAN） is proposed. Doppler ambiguity is removed by SPECAN convolution and a quadratic phase term is derived to recover the two dimensional data support without exactly. The range migration algorithm （RMA：） is applied to generate imagery. Due to no approximation involved in the procedure, the algorithm is suitable for obtaining spotlight SAR image with both wide swath and high resolution. The simulated experiment confirms the validity of the proposal.

关 键 词：聚束SAR 谱分析处理 宽场景高分辨成像 二次相位补偿 

分 类 号：TN95-34[电子电信—信号与信息处理]