GB-InSAR图像误差特征分析与改正模型研究

项目名称： GB-InSAR图像误差特征分析与改正模型研究

项目编号： No.41474004

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 天文学、地球科学

项目作者： 郭际明

作者单位： 武汉大学

项目金额： 85万元

中文摘要： 地基合成孔径干涉雷达（GB-InSAR）是获取高精度工程建筑物动态变化参数及微小形变的一种主动雷达成像遥感测量新技术。GB-InSAR观测测站可设置在监测目标附近的地面位置，观测时间和周期可根据实际需要来确定，与空基合成孔径雷达(AB-InSAR)相比，虽然GB-InSAR图像易受地表大气环境变化影响，但精度和时空分辨率都比AB-InSAR显著提高，其图像误差具有特殊性。本项目从GB-InSAR信号特征和工作环境出发，对目前GB-InSAR干涉测量中系统观测平台不稳定引起的误差、时间和空间失相关引起的误差、相位解缠误差以及地表大气效应影响误差等问题进行深入的研究，并对相关误差特征进行分析，建立适合于GB-InSAR的误差改正模型，利用GNSS技术进行交互验证，提出GB-InSAR的质量评价方法，以期提高GB-InSAR测量数据处理效率和精度，促进GB-InSAR在精密工程测量领域中的应用。

中文关键词： GB-InSAR；误差特征；形变监测；大气效应；影像配准

英文摘要： Ground-based synthetic aperture radar interferometry (GB-InSAR) is a new active radar image remote sensing technique to obtain high precision dynamic parameters and tiny deformation on engineering structures. Owing to the observation station for GB-InSAR is set up near the ground and close to the object, the observing time and period can be determined by the actual requirement. Compared with AB-InSAR, the accuracy and temporal-spatial resolution of GB-InSAR image are significantly improved although it is afected more by the ground atmosphere varyation. GB-InSAR has special properties for its image error.Based on signal characteristics and working environment of GB-InSAR, we research deeply into system errors of GB-InSAR interferometry caused by observation platform instability, time and spatial decorrelation, phase unwrapping and surface atmospheric effects etc, and analyse the characteristics of the errors, establish error correction model of GB-InSAR InSAR system, verify the accuracy of GB-InSAR result with GNSS technique, finally put forward the quality evaluation method of GB-InSAR. The research will improve the efficiency and precision of GB-InSAR data processing, and promote application of GB-InSAR interferometry in the field of precision engineering surveying.

英文关键词： GB-InSAR;error characteristics;deformation monitor;atmospheric effect;image coregistration