摘要: |
合成孔径雷达(SAR)能够实现高分辨率成像,在遥感领域发挥着不可替代的作用,在军用和民用方面都有着广泛的应用。高分辨率SAR需要宽带收发系统,为了缓解大带宽对信号接收和采集设备的压力,对发射的宽带信号采用子带分割方法,在信号处理中通过对子带回波进行合成获得高分辨率图像。在子带合成时,子带内和子带间误差会严重影响最终的图像质量。本文主要研究子带合成误差补偿,利用内定标数据补偿子带内误差,利用回波数据补偿子带间误差。最终实现了多子带误差补偿,并利用机载SAR系统实测数据验证方法的正确性和有效性。 |
关键词: 合成孔径雷达 高分辨率 子带合成 误差补偿 |
DOI: |
分类号:TN959 |
基金项目:国家973计划项目资助课题 |
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Compensation of High Resolution AirborneSAR Multiple Subbands Error |
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Abstract: |
Synthetic aperture radar (SAR) can achieve high resolution imaging, and play an irreplaceable role in remote sensing field. It is widely used in military and civilian areas. Synthetic aperture radar with high resolution requires a wideband transceiver system. In order to alleviate the pressure of large bandwidth for signal receiving and collecting device, a sub-band splitting method is adopted for the transmitted wideband signal, and a high resolution image is obtained by synthesizing the sub-band echo in the signal processing. In the sub-band synthesis, the error in the sub-band and between sub-bands will seriously affect the final image quality. In this paper, the sub-band synthesis error compensation is studied, the sub-band error is compensated using the inner calibration data, and the echo data is used to compensate the error between sub-bands and the error compensation of sub-band synthesis is achieved finally and the correctness and effectiveness of the method is verified by the measured data of airborne SAR system. |
Key words: Synthetic aperture radar(SAR) High resolution Sub-band synthesis Error compensation |