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.
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We thank German Aerospace Center (DLR) for providing the TanDEM-X formation ATI data.
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Foundation item: 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.
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Zhang, Y., Zhang, J., Meng, J. et al. An improved frequency shift method for ATI-SAR flat earth phase removal. Acta Oceanol. Sin. 38, 94–100 (2019). https://doi.org/10.1007/s13131-019-1426-2
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DOI: https://doi.org/10.1007/s13131-019-1426-2