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A Method for Extracting Dem Based on Sub-Aperture Image Correlation in CSAR Mode

Since the circular track synthetic aperture radar (CSAR) could observe the target scene in all directions, it can perform three-dimensional imaging of the target area. When using the sub-aperture sequence to extract the digital elevation model (DEM) of the target scene, in order to be able to reasonably use the correlation between the sub-apertures in the arc to improve DEM extraction accuracy, this paper proposes a method to extract DEM information using the correlation between sub-apertures. By using the feature of stronger correlation between adjacent sub-apertures, the accuracy of DEM extraction is effectively improved. Finally, it was verified by quoting the measured data to verify the feasibility and accuracy of the algorithm.