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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Azimuth-Variant Phase Error Calibration Technique for Multichannel SAR Systems
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Azimuth-Variant Phase Error Calibration Technique for Multichannel SAR Systems

机译：多通道SAR系统的方位角-相位误差校准技术

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摘要

Multiple azimuth channels are usually employed to overcome the inherent limitation between high resolution and wide swath in synthetic aperture radar systems. However, unavoidable channel phase errors will significantly degrade the performance of ambiguity suppression. Conventional calibration methods usually regard these phase errors as constants during the whole observation time and ignore the azimuth-variant phase errors, which may not totally suppress azimuth ambiguities especially for very strong targets. This letter presents an azimuth-variant phase error calibration technique. The proposed technique first selects a strong point-like target as the calibration source. Then, the azimuth-variant phase errors can be estimated by comparing the phase of the calibration source and the corresponding steering vector in the range-compressed signals. Besides, a preprocessing method is presented to improve the calibration accuracy when the selected calibration source is affected by noise or interferences. Theoretical analysis and experiments demonstrate the feasibility of the proposed technique.
机译：在合成孔径雷达系统中，通常使用多个方位通道来克服高分辨率和宽幅之间的固有限制。但是，不可避免的信道相位误差将大大降低歧义抑制的性能。传统的校准方法通常将这些相位误差视为整个观测时间内的常数，而忽略了方位角变化的相位误差，这可能无法完全抑制方位角模糊性，尤其是对于非常强的目标。这封信介绍了一种方位角相位误差校准技术。所提出的技术首先选择强点状目标作为校准源。然后，可以通过比较校准源的相位和距离压缩信号中相应的转向矢量来估计方位角相位误差。此外，提出了一种预处理方法，可以在所选校准源受到噪声或干扰影响时提高校准精度。理论分析和实验证明了该技术的可行性。

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