Front-side-looking SAR real-time imaging method based on multi-core DSP

The invention discloses a front-side-looking SAR real-time imaging method based on a multi-core DSP. The problems that an existing front-side-looking SAR imaging algorithm is limited when the angle of front side looking is processed, the calculated amount is large, and motion compensation is not carried out are mainly solved. The front-side-looking SAR real-time imaging method includes the steps of 1, dividing echo data into blocks according to orientations, and mapping the data in the blocks to DSP processing cores; 2, carrying out distance migration correction and distance pulse pressure on the data in the blocks; 3, estimating the distance non-space-variant motion error through the data obtained after the pulse pressure; 4, carrying out enveloping correction and error compensation on the echo data through the distance non-space-variant motion error; 5, estimating the distance space-variant motion error through the compensated data, and carrying out distance space-variant error compensation; 6, carrying out orientation focusing on the data obtained after the distance space-variant error compensation, and obtaining an SAR image. By means of the front-side-looking SAR real-time imaging method, the motion errors can be effectively estimated, and the resolution of the SAR image can be increased; in addition, the operation efficiency is high, and the front-side-looking SAR real-time imaging method can be used for ground-target detecting and identifying of airborne radars or missile-borne radars.