高分辨率机载SAR多子带合成误差补偿方法

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，在军事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。针对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，提出了一种基于实测数据的子带合成误差补偿方法。利用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实测数据验证了方法的正确性和有效性。

A Compensation Method for High Resolution Airborne SAR Multiple Subbands Synthesis Error

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. High resolution SAR 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 echoes in the signal processing. For sub-band synthesis, the error within sub-band and the between sub-bands will seriously affect the final image quality. A sub-band synthesis error compensation method based on the measured data is proposed. The error within sub-band is compensated using the inner calibration data, and the error between sub-bands is compensated using the echo data. The error compensation of sub-band synthesis is achieved finally. The correctness and effectiveness of the proposed method is verified by the measured data of airborne SAR system.