Amplitude and Phase Errors Correction Method for FMCW Array SAR System Using Single Prominent Point Echo
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摘要: 调频连续波(Frequency Modulated Continuous Wave, FMCW)阵列合成孔径雷达系统(SAR)将FMCW体制与阵列SAR技术相结合，在军事和民用领域都有着广泛的应用前景。但是，实际调频连续波阵列SAR系统中不可避免地存在调频率非线性误差和多通道幅相误差问题，如不校正会造成雷达图像质量降级。该文建立考虑上述误差的信号模型，并针对该模型提出一种基于单特显点回波数据的误差校正方案和成像处理流程，最后通过仿真和实际数据处理验证了所提方法的有效性。Abstract: Frequency Modulated Continuous Wave (FMCW) array antenna SAR system combines the FMCW and array antenna imaging technology, which is of abroad interest in both civil and military applications. While in practical FMCW array SAR, the presents of unavoidable sweep rate non-linearity error in the frequency modulation and the multi-channel amplitude/phase errors severely degrade the reconstruction image quality. The signal model with sweep rate non-linearity error and multi-channel amplitude/phase errors is proposed in this paper. An error calibration scheme and data processing flow chart based on single prominent point echo are presented. Extensive simulations and real data processing are performed to validate the effectiveness of the proposed calibration scheme.
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