研究目的
To obtain a new and effective method for estimating and compensating the interchannel phase error of the Chinese GF-3 Synthetic aperture radar (SAR).
研究成果
The proposed method effectively suppresses the azimuth ambiguities caused by the interchannel phase error and provides a higher quality SAR image. It is more practical and efficient in practical applications due to its operation in the image domain and the need to image the data only once.
研究不足
The method requires the number of channels to be equal to the Doppler ambiguities number, which may limit its application in systems with different configurations.
1：Experimental Design and Method Selection:
The methodology involves a two-step correction process for channel phase error, including coarse correction using the correlation function method and fine correction using a heuristic search algorithm to estimate the residual phase by searching the extremum of the quality function.
2：Sample Selection and Data Sources:
The measured data of high-resolution GF-3 dual-channel ultrafine imaging mode is used to verify the validity of the method.
3：List of Experimental Equipment and Materials:
The Chinese GF-3 SAR system is utilized, which is a C-band, multipolarized, high-resolution, remote-sensing satellite.
4：Experimental Procedures and Operational Workflow:
The process includes coarse correction of phase error, insertion of zeros for each channel, imaging with CSA, and precise correction of the channel phase error using a heuristic search algorithm.
5：Data Analysis Methods:
The joint quality function is defined to evaluate the degree of azimuth ambiguities of the image for the precious phase correction.
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