一种多基线相位解缠频域快速算法

摘要

一切将相位由主值或相位差值恢复为真实值的过程统称为相位解缠，除了雷达干涉应用外，相位解缠在合成孔径声纳、自适应光学、核磁共振、地震处理等方面都有重要应用，多基线可提高相位解缠的性能。以多基线干涉合成孔径雷达（In—SAR）系统为应用背景，提出一种多基线InSAR干涉相位解缠频域快速算法。该算法的基本思想是使相位梯度估计值的频域函数与各基线相位梯度频域函数加权和之差的平方和最小。仿真及实测数据处理结果表明：频域算法效果与时域算法类似，由于避免了镜像操作，其效率大大提高。%Phase unwrapping is usually defined as the reconstruction of the real value of the phase from the principal value. In addition to the application of radar interferometry, phase unwrapping is also applied significantly in the synthetic aperture sonar, adaptive optics, nuclear magnetic resonance, seismic processing and so on. Multi-baseline can improve the performance of phase unwrapping. This paper, used the multi-baseline interferometric synthetic aperture radar （InSAR） system as the application background, proposes a rapid method for the multi-baseline InSAR interferometric phase unwrapping in frequency domain. The basic idea is to make the least square of the weighted difference between the frequency domain function of the phase gradient estimated value and of the baseline phase gradient. Both simulated and real data processing results show that the frequency domain method has similar effect as the time domain method, while its efficiency is greatly improved by avoiding the mirroring operations.