High-precision deformation monitoring algorithm for GBSAR system: rail determination phase error compensation  

作　　者：Cheng HU Mao ZHU Tao ZENG Weiming TIAN Cong MAO 

机构地区：[1]Beijing Key Laboratory of Embedded Real-time Information Processing Technology, Beijing Institute of Technology, Beijing 100081, China

出　　处：《Science China(Information Sciences)》2016年第8期200-215,共16页中国科学（信息科学）（英文版）

基　　金：supported by National Natural Science Foundation of China (Grant Nos. 61120106004, 61225005, 61471038 and 61427802);Chang Jiang Scholars Program (Grant No. T2012122);111 Project of China (Grant No. B14010)

摘　　要：In recent years, the repeat-pass GBSAR （ground based synthetic aperture radar） system has demon- strated its capacity to acquire deformation. Nevertheless, in a variety of applications, it needs to measure the deformation with the precision up to 0.1 mm, which could not be reached by utilizing the traditional PS （permanent scatterer） algorithm in most cases. Generally, one of the main reasons could be summarized into the phase error caused by the rail determination error, because the precision of rail determination might degrade during long working hours. However, the traditional PS algorithm could not compensate for the phase error caused by the rail determination error. In order to solve the problems, we modify the conventional PS algorithm. Firstly, we deduced the transformation relationship between the rail determination error and its correspond- ing interferometrie phase error. Then, the phase errors caused by the atmosphere and the rail determination error were jointly compensated. The experimental data, which were obtained in Fangshan District in Beijing （China）, were used to test and verify the performance of the new algorithm. After the comparison between the results processed by the new algorithm and those processed by the traditional algorithm, the proposed method demonstrated its ability to obtain high-precision deformation.In recent years, the repeat-pass GBSAR （ground based synthetic aperture radar） system has demon- strated its capacity to acquire deformation. Nevertheless, in a variety of applications, it needs to measure the deformation with the precision up to 0.1 mm, which could not be reached by utilizing the traditional PS （permanent scatterer） algorithm in most cases. Generally, one of the main reasons could be summarized into the phase error caused by the rail determination error, because the precision of rail determination might degrade during long working hours. However, the traditional PS algorithm could not compensate for the phase error caused by the rail determination error. In order to solve the problems, we modify the conventional PS algorithm. Firstly, we deduced the transformation relationship between the rail determination error and its correspond- ing interferometrie phase error. Then, the phase errors caused by the atmosphere and the rail determination error were jointly compensated. The experimental data, which were obtained in Fangshan District in Beijing （China）, were used to test and verify the performance of the new algorithm. After the comparison between the results processed by the new algorithm and those processed by the traditional algorithm, the proposed method demonstrated its ability to obtain high-precision deformation.

关 键 词：permanent scatterer （PS） synthetic aperture radar （SAR） ground-based SAR deformation mon-itoring RADAR 

分 类 号：P225.1[天文地球—大地测量学与测量工程]