【作者】 陈程； 谷宝民； 朱岱寅；

【Author】 CHEN Cheng;GU Baomin;ZHU Daiyin;Nanjing University of Aeronautics and Astronautics;

【机构】 南京航空航天大学；

【摘要】 未来战争节奏加快、战场环境复杂多变,对海面运动目标(如巡洋舰、护卫舰、驱逐舰和航母等)动态信息的获取具有至关重要的意义。合成孔径雷达(Synthetic Aperture Radar, SAR)能够全天时、全天候、远距离地对目标进行高分辨率成像,对目标具有成像和识别的能力。而合成孔径雷达对运动目标的高精度成像算法通常复杂且运算量大,无法满足实时性要求。本文提出基于Keystone变换的SAR/ISAR混合成像算法,并采用单片多核DSP TMS320C6678实现实时成像处理架构。处理步骤包括基于Keystone变换的SAR成像、运动目标检测、基于距离对准和相位梯度自聚焦的ISAR成像。最后,对海实测数据的成像结果验证了单片多核DSP并行处理的有效性。更多还原

【Abstract】 In the future, the rhythm of war will be accelerated and the battlefield environment will be complex and changeable. It is of great significance to obtain dynamic information of sea surface moving targets( such as cruisers, frigates, destroyers and aircraft carriers). Synthetic Aperture Radar( SAR) can image the target with high resolution all day, all weather and long distance, and has the ability to image and recognize the target. The high-precision imaging algorithm of Synthetic Aperture Radar for moving targets is usually complex and computationally intensive, which cannot meet the real-time requirements. In this paper, a SAR/ISAR hybrid imaging algorithm based on Keystone transform is proposed, and a single-chip multi-core DSP TMS320C6678 is used to realize real-time imaging processing architecture. The processing steps include SAR imaging based on Keystone transform, moving target detection, ISAR imaging based on range alignment and phase gradient autofocus. Finally, the imaging results of sea measured data verify the effectiveness of parallel processing of single-chip multi-core DSP.更多还原