基于多特显点的干涉ISAR横向定标技术  

Interferometric ISAR scale method based on dominant scatterers

作　　者：李丽亚[1] 刘宏伟[1] 纠博[1] 吴顺君[1] 

机构地区：[1]西安电子科技大学雷达信号处理国家重点实验室,陕西西安710071

出　　处：《系统工程与电子技术》2008年第9期1653-1656,共4页Systems Engineering and Electronics

基　　金：教育部长江学者和创新团队支持计划(IRT0645);国家自然科学基金(60772140);国防预研项目;国防预研基金资助课题

摘　　要：针对干涉式逆合成孔径雷达(InISAR)成像时低信噪比和干涉相位缠绕带来的问题,利用ISAR图像强像素点处信噪比较强的这一特性,提出了一种新的基于多特显点的InISAR成像方法。该方法利用ISAR图像中若干特显点的解缠绕后的真实相位差,解得特显点的横距;然后根据特显点的多普勒频率和横距的关系,对整幅ISAR像进行横向定标。仿真结果表明,该方法对噪声有较强的稳健性,其能正确成像时的信噪比水平与传统方法相比有10-15 dB的降低。To deal with the low signal-to-noise ratio and phase wrapping in interferometric ISAR imaging, a novel method of interferometric ISAR imaging based on the dominant scatterers is proposed, where the characteristic of the higher SNR at stronger pixels is used. By using the unwrapped interferometric phase of the dominant scatterers in ISAR image, the cross range of the dominant scatterers is gained. Then, the whole ISAR image can he scaled by the Doppler frequency and the cross range of the dominant scatterers. The simulation results show that the proposed method is robust to noise. Compared with the conventional method, the signal-to- noise ratio is decreased by 10--15 dB when the vivid image is obtained.

关 键 词：逆合成孔径雷达 干涉 相位缠绕 特显点 

分 类 号：TN958[电子电信—信号与信息处理]