一种利用无网格技术和局部频率估计的相位展开算法

A Phase Unwrapping Algorithm Adopts Local Frequency Estimation and Mesh-less Method

为了能提高干涉合成孔径雷达信号处理时相位的展开精度,作者在相位展开中利用高精度局部频率估计法代替相位差分法,这是因为局部频率估计法能够更加准确地反映实际地形的变化。同时为了抑制残差点处的错误传播至整个相位图,引入无网格法,通过在干涉图中划分局部支持域有效地限制了误差的扩散。通过仿真实验以及实测试数据验证了该方法能够有效地减少误差累积的影响,从而提高相位的展开精度。

To improve the processing precision of phase unwrapping in interferometric synthetic aperture radar （InSAR）, the phase difference was replaced by local frequency estimation. The local frequency estimation could reflect topographic change more accurately than phase difference. And to prevent the residues error spread all over the image, the mesh-less method was introduced to avoid error propagation effectively by dividing local support domain in interferogram. Both simulation and experimental results showed that the pro- posed method can reduce the influence of the error, and improves the precision of the phase unwrapping.