一种UKF与PF相结合的相位解缠算法  

A phase unwrapping algorithm combining unscented Kalman filter and particle filter

作　　者：李玉婷 谢先明[1] LI Yuting;XIE Xianming(School of Information and Communication,Guilin University of Electronic Technology,Guilin,Guangxi 541004,China)

机构地区：[1]桂林电子科技大学信息与通信学院

出　　处：《测绘科学》2019年第8期19-31,共13页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(41661092,61461011);广西自然科学基金重点项目(2016GXNSFDA380009);广西自然科学基金项目(2014GXNSFBA118273);广西无线宽带通信与信号处理重点实验室2014/2015年主任基金项目(GXKL061503);认知无线电教育部重点实验室主任基金项目;认知无线电与信息处理省部共建教育部重点实验室2017年度主任基金项目(CRKL170108);2017年桂林电子科技大学研究生科研创新项目(2017YJCX23)

摘　　要：针对干涉相位图解缠问题,该文提出一种基于掩膜图的无损卡尔曼滤波与粒子滤波相结合的相位解缠算法,并结合基于AMPM局部相位梯度估计技术快速和精确地从复干涉相位图中获取相位梯度等信息以及最大堆排序算法从高质量像元到低质量像元的路径快速地搜索最佳待解缠像元,减少在路径跟踪过程中所消耗的时间。该文算法不仅可以高效、精确地在相位解缠的同时进行干涉图滤波,降低前置预滤波器的难度与复杂度,甚至可以在解缠高信噪比干涉相位图时免去预滤波的过程,而且在一定程度上能将相位解缠误差限制在低质量像元区域,减少误差传递效应,提高相位解缠的精度,在实测数据和模拟数据实验结果中表明:比现有的传统算法如枝切法等InSAR干涉相位解缠算法有更高的精度和稳健性。Aiming at the problem of interference phase diagram unwrapping,this paper proposed a phase unwrapping algorithm based on mask map information for interferometric fringes,which combines unscented Kalman filter(UKF)and particle filter(PF)phase unwrapping algorithms.And this algorithm also integrated with the local phase gradient estimation algorithm and the maximum heap sort algorithm.Among them,the local phase gradient estimation algorithm based on the amended matrix pencil model(AMPM),which was applied to acquire phase gradient information from the complex interferogram quickly and accurately.And the maximum heap sort algorithm was used to guide the proposed method to efficiently unwrap wrapped pixels along the path from the high-reliance region to the low-reliance region in the wrapped interferogram,which is benefit to reduce the cost time at the path tracking.This algorithm not only could efficiently and accurately perform phase unwrapping while interferogram filtering,but also can reduce the difficulty and complexity of the pre-prefilter,and could even remove the pre-filtering procedure in the high signal-to-noise interferogram.And by the proposed method,the phase unwrapping error could be limited to the low-quality pixel region to a certain extent to reduce the error transfer effect and improve the accuracy of phase unwrapping.Meanwhile,the experimental results on the simulated and real data showed that the proposed algorithm had higher accuracy and robustness than some traditional algorithms such as branch cut algorithm.

关 键 词：相位解缠 掩膜图 最大堆排序 无味卡尔曼滤波器 粒子滤波器 相位梯度估计 

分 类 号：P237[天文地球—摄影测量与遥感]