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Alternative TitleA NewMethod for Doppler-Ambiguity-Number Estimationin Spaceborne SAR Imag ing
翟文帅; 张云华; 北京8701信箱
Source Publication测试技术学报
Keyword星载合成孔径雷达sar 多普勒模糊数 chirp scaling算法 图像熵 图像均方差
Abstract在分析CS(Chirp Scaling)成像算法的基础上,发现弯曲因子C,和等效调频率因子K对多普勒模糊数DAN(Doppler Ambiguity Number)的变化非常敏感,不正确的DAN,将使C,因子和E因子失效,最终导致SAR图像的清晰度下降和位置发生变化.据此提出估计星载SARDAN的新算法:将DAN的变化与描述图像清晰度的评价函数(熵或均方差)联系起来,通过观察所得图像的熵或均方差随DAN值的变化,找到最小熵或最大均方差时所对应的DAN,即为正确的值.用Radarsat的实际数据验证了算法的有效性.分析表明,基于图像均方差的DAN估计优于图像熵的DAN估计,前者在成像区域场景反差较大和较小时均适用,而后者在成像区域场景反差较小时表现不稳定.
Other AbstractIt is found that in the Ch irp Scaling algo rithm ,the cu rvatu re facto r Cs and the effect ive FM chirp rate K s are very sen sit ive to the change of Dopp ler2Amb igu ity2N umber (DAN ).When DAN is inaccu rate, Cs and Ks will be invalid and the definition of resu lted SAR image w ill degrade,i.e.the def in it ion2evaluat ion2funct ion of SAR image (en t ropy o r mean variance)varies w ith DAN. Based on the analysis, a new method was proposed for DAN estimation in spacebo rne SAR imaging by f inding the minimum of image en t ropy o r the max imum of image mean variance. The raw data of Radarsat were used to validate the method.The resu lt s indicate that the algo rithm based on mean variance is bet ter than the algo rithm based on en tropy.The former is app licab le no mat ter the con t rast of image area is high or low , but the latter is only suitable for high cont rast area
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
翟文帅,张云华,北京8701信箱. 一种估计星载SAR多普勒模糊数的新方法[J]. 测试技术学报,2008,22(3):250-255.
APA 翟文帅,张云华,&北京8701信箱.(2008).一种估计星载SAR多普勒模糊数的新方法.测试技术学报,22(3),250-255.
MLA 翟文帅,et al."一种估计星载SAR多普勒模糊数的新方法".测试技术学报 22.3(2008):250-255.
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