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针对低信噪比情况,建立了新的接收阵列误差模型,提出了一种改进单辅助源通道阵列幅相误差校正算法。该算法利用自相关矩阵对角线部分求解通道幅度误差,用最小二乘法对上三角部分求解通道相位误差。仿真结果表明:在低信噪比时,改进校正算法性能明显优于传统校正算法,在高信噪比时,2种算法残差均非常小。实验结果表明:利用改进的校正算法对综合孔径辐射计进行校正后所得的图像边界清晰、干扰较少,与实际亮温对应较好,明显优于采用传统校正算法进行校正后所得的图像。
Aiming at the low signal-to-noise ratio (SNR), a new receiver array error model was established and an improved amplitude and phase error correction algorithm for single auxiliary channel array was proposed. The algorithm uses the diagonal part of the autocorrelation matrix to calculate the channel amplitude error and uses the least square method to solve the channel phase error for the upper triangular part. The simulation results show that at low signal-to-noise ratio, the performance of the improved correction algorithm is significantly better than the traditional correction algorithm, the residuals of the two algorithms are very small at high signal-to-noise ratio. The experimental results show that the corrected aperture of the synthetic aperture radiometer with the improved calibration algorithm is clear, with less interference and corresponding to the actual brightness temperature, which is obviously better than that of the traditional correction algorithm.