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Research of adaptive error correction for multi-channel SAR receiver

For the purpose of improving the range resolution of SAR system under the existing technical conditions, multi-channel synthesis is one of the main technical approaches. However, this method can bring the problems of amplitude-phase distortion and channel synchronization among different channels. In this paper the structure of multi-channel signal synthesis is built, the error characteristics of synthetic wideband signal and the errors’ influence on the synthesis are analyzed, and a mathematical model of channel errors is established. Then an adaptive channel error correction method, which is based on the improved internal calibration method, is proposed. By adjusting the input power of the exciting signal, the low-power transmitting signal is made to work in a stable saturation area, where the amplitude-frequency and phase-frequency characteristics of the signal are constant. By means of pre-distortion technology, the transmission characteristics of the channels can be obtained, and the phase-mplitude error in the multi-channel can be eliminated and corrected.The experimental results show that the method is reasonable and effective in the end.