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目的在干涉合成孔径雷达的相位展开过程中,如果相位展开的展开路径穿过残差点就会产生相位展开的误差。在相位展开的时候,希望将相位展开的误差限制在局部区域,提高相位展开的精度。方法首先通过判断截断相位图的残差点,并以In SAR的干涉一致性图作为相位展开的可靠性度量,对截断相位图进行量化,将残差处的可靠度设为排序中的最低等级。在进行可靠度排序后进行干涉合成孔径雷达相位图的相位展开。结果使用该算法改进了经典可靠度导向相位展开算法中可靠度排序的缓慢问题。与经典菱形算法相比,展开精度高很多。与洪水算法相比,展开速度能快上百倍。通过可靠度排序的改进,对干涉合成孔径雷达相位展开后的结果进行分析,可以看到提高了相位展开的精度,有效的控制了相位展开过程中误差的传递。结论相位展开算法的改进提高了干涉合成孔径雷达相位展开的精度,在干涉合成孔径雷达的相位展开中可以广泛应用。
Aim To avoid the error of phase unwrapping during the phase unwrapping of SAR interferometer, if the phase unwrapping path crosses the residual point. When the phase is unfolded, it is desirable to limit the phase unwrapping error to a local area and improve the phase unwrapping accuracy. Firstly, the truncated phase diagram is quantified by judging the residual point of the truncated phase diagram and using the interference conformance graph of In SAR as the measure of phase unwrapping. The reliability of the residual is defined as the lowest rank in the sequence. The phase unwrapping of the synthetic aperture radar interferogram is performed after the reliability ranking. Results The algorithm is used to improve the slowness of reliability ranking in classical reliability-oriented phase unwrapping algorithm. Compared with the classic diamond algorithm, the deployment accuracy is much higher. Compared with the flood algorithm, unfolding speed can be hundreds of times faster. Through the improvement of the reliability ranking, the results of the phase unwrapping of the SAR interferometer are analyzed. It can be seen that the accuracy of the phase unwrapping is improved and the error propagation in the phase unwrapping is effectively controlled. Conclusion The improvement of the phase unwrapping algorithm improves the phase unwrapping accuracy of the interferometric synthetic aperture radar and can be widely used in the phase unwrapping of the interferometric synthetic aperture radar.