Application of GPS in airborne SAR image based disaster evaluation

In the process of airborne SAR image based disaster evaluation, the first step is to complete image rectification, so the image rectification time is the bottleneck of the whole disaster evaluation process. Dynamic GPS data recording instrument positioned on the airborne SAR airplane can record the precise parameters of the SAR such as the velocity, the latitude, the longitude, the elevation and so on. The parameters are the key parameters to determine the relationship between the pixels of the SAR image and the points on the ground in the F. Leberl formula that is the SAR imaging equation. Thus dynamic GPS data can directly transform coordinates of image pixels to geographical coordinates. With the geographical coordinates, we can rectify the airborne SAR image quickly to make preparation for other processing of disaster evaluation.