Unmanned aerial vehicle airborne SAR surveying and mapping imaging method and system

The invention discloses an imaging method and system for unmanned aerial vehicle airborne SAR surveying and mapping. The imaging method comprises the following steps of obtaining original echo data; calculating a slant distance error caused by the unmanned aerial vehicle position error of the airborne SAR; according to a slope distance error, performing first motion compensation processing on the original echo data to obtain first compensation echo data; performing second motion compensation processing on the first compensation echo data to obtain second compensation echo data; and performing aggregation imaging on the second compensation echo data to obtain a focused SAR image. When echo data with errors are directly subjected to imaging processing through a traditional imaging algorithm, the imaging result azimuth focusing effect is poor, and when imaging processing is carried out after motion errors are compensated through the secondary motion compensation method, the obtained SAR image is good in focusing