| Zhang Yubin,Zhang Jie,Meng Junmin,Fan Chenqing. 2019. An improved frequency shift method for ATI-SAR flat earth phase removal. Acta Oceanologica Sinica, 38(8):94－100 |
| An improved frequency shift method for ATI-SAR flat earth phase removal |
| ATI-SAR平地相位去除的改进频移法 |
| Received:May 04, 2018 |
| DOI：10.1007/s13131-019-1426-2 |
| Key words:flat earth phase ATI-SAR frequency shift orbital parameter |
| 中文关键词: 平地相位 顺轨干涉SAR 频移 轨道参数 |
| 基金项目:The National Key Research and Development Program of China under contract No. 2016YFC1402703; the National Natural Science Foundation of China under contract Nos 61471136 and 61501130. |
| Author Name | Affiliation | E-mail | | Zhang Yubin | First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China
College of Information Science and Engineering, Ocean University of China, Qingdao 266100, China | | | Zhang Jie | First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Meng Junmin | First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | | | Fan Chenqing | First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China | fanchenqing@fio.org.cn |
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| Abstract: |
| An improved frequency shift method is proposed to remove the flat earth phase in ATI-SAR ocean surface motion detection in this study. First, two conventional flat earth effect removal methods (i.e., the frequency shift method and the orbital parameter method) are introduced and compared. Then, two improvements to frequency shift method are suggested. In the first improvement, the phase diagram is divided into several sub-blocks to calculate the phase fringe frequency. In the second improvement, a function between the phase of land regions and position is fitted to correct the residual flat earth phase based on the phase of the land regions that tend toward zero in an along-track interferogram. It is found that the improved frequency shift method is greatly improved; and it agrees well with the orbital parameter method, and achieves similar accuracy. |
| 中文摘要: |
| 本文提出了一种改进的频移方法以去除ATI-SAR海洋表面运动探测中的平地相位。首先，介绍和比较两种常规的平地效应去除方法（即，频移方法和轨道参数方法）。然后，对频移方法提出了两项改进措施。第一，干涉相位图被分成几个子块，分别计算相位条纹空间频率。第二，基于在顺轨干涉相位图中陆地区域的相位趋于零的特点，拟合陆地区域的相位与其位置之间的函数关系，进一步校正残余平地相位。结果表明，改进后的频移法去除平地效应的效果得到了很大改善。改进方法的结果与轨道参数法一致性更好，精度趋于轨道参数法的精度水平。 |
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