机载干涉SAR/ISAR对地面慢速目标成像研究
Studies of ground slow-moving target imaging by airborne interferometric sar/isar
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摘要: 该文研究用机载干涉SAR/ISAR技术对地面慢速目标成像，该技术利用SAR成像的距离和横向距离高分辨率，以及干涉仪的空域对消，实现杂波抑制，提高信杂比。动目标的真实方位由相位比较干涉仪测定。进而用ISAR处理得到慢速目标的高分辨图像。文中详细讨论了机载干涉SAR/ISAR系统框图和工作原理，并导出了该系统中SAR、干涉仪空域对消和测向以及ISAR处理的定量关系式。理论分析和初步计算机仿真证明了这项技术的正确性。Abstract: In this paper, ground slow-moving target imaging via airborne interferometric SAR/ISAR technique is investigated. Land clutter suppression and SCR improvement are achieved by range and cross-range two-dimensional high resolution of SAR. imaging and spatial domain cancellation of interferometer. True azimuth of moving target is determined using phase-comparison interferometer. Furthermore, high resolution image of the slow-moving target is obtained by IS AR processing. The block diagram and the operational principle of the airborne interferometric SAR./ISAR system are discussed in detail. Quantitative relations for SAR,, interferometer spatial domain cancellation, direction finding and ISAR processing are derived. Theoretical analysis and preliminary computer simulation reveal the validity of this technique.
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