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85°大前斜视SAR成像具有合成孔径时间长、成像复杂的特点,很难用传统SAR成像算法进行成像。后向投影算法虽能精确成像,但满足不了高动态运动平台大前斜视SAR成像对实时性和高帧频的需求。针对上述问题,提出一种滑窗子孔径后向投影并行处理算法。算法利用后向投影算法实现大前斜视成像,通过调整滑窗宽度和速度满足分辨率和帧频的要求,并配合多内核并行处理DSP芯片实现实时成像。仿真结果验证了成像算法的精确性和高效性。
With the characteristics of long synthetic aperture and complex imaging, the 85 ° large anterior oblique SAR imaging is difficult to image with the traditional SAR imaging algorithm. Although the backward projection algorithm can accurately imaging, but can not meet the high dynamic motion platform large strabismus SAR imaging of real-time and high frame rate needs. Aiming at the above problems, this paper proposes a sliding window aperture back projection parallel processing algorithm. The algorithm uses back-projection algorithm to achieve large frontal strabismus imaging, and adjusts the sliding window width and speed to meet the requirements of resolution and frame rate, and realizes real-time imaging with multi-core parallel processing DSP chip. The simulation results verify the accuracy and efficiency of the imaging algorithm.