应用多收发孔径实现高分辨率宽测绘带的合成孔径雷达研究
doi: 10.3724/SP.J.1146.2006.00140
Study on High Resolution, Wide Swath Synthetic Aperture Radar Using Multiple Transmit-Receive Apertures
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摘要: 测绘带宽和分辨率是合成孔径雷达(SAR)系统的两个关键指标，但SAR的脉冲工作方式限制了分辨率和测绘带宽的同时提高。为了解决这一问题，该文采用多个发射机和接收机进一步展宽测绘带和提高分辨率，同时增加了平均发射功率，提高了信噪比。文中介绍该技术的实现方法，并通过实际参数仿真与常规SAR和采用单发射机的多波束SAR进行了对比，证明了进一步展开测绘带的可行性。Abstract: The most important specifications of space-borne Synthetic Aperture Radar (SAR) are resolution and swath width. But in conventional SAR, there is a well known trade-off between them because of the pulse mode. In this paper, a new method of multiple azimuth beams is proposed using multiple transmit-receive apertures to further improve the swath width and resolution in azimuth. In addition, it should be noticed that the radiation gain or the equivalent isotropic radiated power per unit area can be greatly increased and the Signal-Noise Rate (SNR) also becomes better. The implement of this method is introduced and comparison with STMAB method and conventional SAR is made with computer simulations, and the effectiveness of this method is illustrated.
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