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以色列发射的第1颗SAR(合成孔径雷达)侦察卫星TECSAR中成功应用了一种新的工作模式———Mosa-ic模式,该模式兼具高分辨率和大成像测绘带的优势。给出了该模式可行的成像方案,并提出了一种解多普勒模糊的方位变调频算法,结合ECS(扩展线频调变标)算法对该模式进行成像,降低了系统对PRF(脉冲重复频率)的要求,在系统所能达到的有限PRF条件下,最大程度地增加了马赛克单元的方位无模糊成像宽度。仿真结果验证了算法的有效性。
Israel’s first SAR (Synthetic Aperture Radar) reconnaissance satellite, TECSAR, successfully implemented a new operating mode called the Mosa-ic mode, which combines the advantages of a high-resolution and large imaging swath. A feasible imaging scheme is given and an azimuth frequency-varying algorithm for solving Doppler ambiguity is proposed. The imaging algorithm is combined with ECS (Extended Line Frequency Modulation) algorithm to reduce the influence of the system on PRF Repetition rate) requirements, maximizing the azimuth-free fuzzy imaging width of the mosaic cell under the limited PRF conditions that the system can achieve. Simulation results verify the effectiveness of the algorithm.