A geometric distortion correction method of SAR image based on FPGA

The invention discloses a geometrical distortion correction method of an SAR image based on an FPGA, which comprises the following steps: (1) according to imaging scene parameters, calculating parameters required for geometrical distortion correction and laying correction point mesh; (2) calculating the coordinates of a column of correction points in the SAR image to obtain the corresponding addresses stored in the DDR, and temporarily storing the addresses in an address FIFO; (3) reading the address of a correction point grid from the address FIFO at a time, performing a read operation, reading the data corresponding to the address, and temporarily storing the data in another FIFO; 4) repeating the step 3) until the reading of the data correspond to the column correction points is completed, and then writing the data back into the DDR; (5) repeating steps (2)-(4) until all the correction point grids are processed. The invention realizes the geometrical distortion correction method ofthe SAR image based on th