基于回波数据的高分辨力机载SAR运动补偿
High Resolution Airborne SAR Motion Compensation Based on Echo Data
-
摘要: 该文详细地分析了基于距离压缩数据的运动补偿和基于复图像的运动补偿的机理，提出了基于 回波数据的高分辨力机载SAR运动补偿算法。该算法采用子孔径技术，利用修改的最大对比度法提取子孔径的多普勒调频斜率，作距离压缩数据的时域运动补偿，然后用PGA作复图像的频域运动补偿。实录数据的成像实验表明，该算法能有效地克服单一运动补偿算法的场景依赖性，获得比较满意的成像质量。
-
关键词:
- 运动补偿; 机载SAR; 成像; PGA
Abstract: This paper amply analyzes the airborne SAR motion compensation mechanism on the range compression data and complex image data, and proposes a motion compen-sation algorithm for the high resolution airborne SAR. This algorithm makes use of the sub-aperture technique to estimate the sub-apertures Doppler rate with the improved max-imum contrast method, and then performs time-domain motion compensation for range compressing data and executes the frequency-domain motion compensation for complex im-age with PGA method. The raw data imaging result shows that the algorithm can effectively overcome the disadvantage of the scene dependence of the singularity motion compensation algorithm, and improve the SAR image quality. -
Moreira A, Huang Yonghong. Airborne SAR processing of highly squinted data using a chirp scaling approach with integrated motion compensation . IEEE Trans. on GRS, 1994, 32(5):1029-1040[2]Moreira J R. A new method of aircraft motion error extract from radar raw data for real time motion compensation. IEEE Trans.on GRS, 1990, 28(4): 620-626.[3]Gallon A.[J].Impagnatiello F. Motion compensation in chirp scaling SAR processing using phase gradient autofocusing . IGARSS 98, Alenia, Aerospazio, Rome, Italy.1998,:-[4]Blacknell D, Freeman A, et al.. Geometric accuracy in airborne SAR images. IEEE Trans. on AES, 1989, 25(2): 241-255.[5]Wahl D E, Eichel P H, Ghiglia D C, et al.. Phase gradient autofocus-a robust tool for high resolution SAR phase correction. IEEE Trans. on AES, 1994, 30(3): 827-835.[6]Eichel P H, Wahl D E. Phase gradient algorithm as an optional estimator of the phase derivative[J].Optics letters.1989, 14(20):1101-1103 -
计量
- 文章访问数: 2230
- HTML全文浏览量: 81
- PDF下载量: 784
- 被引次数: 0
下载:
