摘要
卫星成像的基线、视角、基线倾斜角、斜距、卫星距离地面径向距离以及地面分辨率等因素严重影响着合成孔径雷达差分干涉测量监测地面形变的能力和形变监测结果的精度。本文在分析四轨法D-InSAR基本原理和数据处理流程基础上,详细给出了相位测量误差对形变测量精度影响的定量关系式;分析讨论了基线长度误差、基线倾斜角误差、斜距误差、卫星高度误差和地形因素误差对形变测量精度的影响。从而在定量分析方面得出了这些误差对四轨法D-InSAR形变测量精度影响的结论。
Differential interferometry synthetic aperture radar（D-InSAR） is further development of InSAR,and four-pass D-InSAR is one type of data processing by this method.Because many uncertain factors affect the accuracy of data processing of four-pass D-InSAR,it is not applied widely in the monitoring of land deformation.However,four-pass D-InSAR does not require an external digital elevation model and has the advantage of a possible guarantee of the accuracy of monitoring deformation.The baseline,visual angle,baseline tilt angle,slope range,satellite orbit height,ground resolution,and other satellite imaging factors significantly affect the capability and accuracy of D-InSAR measurement in monitoring land subsidence;satellite orbit error is the main factor affecting the accuracy of deformation measurement when using four-pass D-InSAR.The difference in satellite orbit and radar frequency is generated by various sensors of satellites acquiring radar images,which could also significantly affect deformation measurement with this method.The system and speckle noise,loss of pixel registration,visual number,and temporal and baseline decorrelation are the main sources of phase measurement error and significantly affect each pixel of images from the coherent radar,for which the phase error affecting the accuracy of deformation measurement when using four-pass D-InSAR is created.The baseline is generated by two different satellite orbits,which causes the baseline error to be systematic;hence,the baseline length error is also systematic.The baseline tilt angle affecting high altitude onboard the satellite is created by various uncertainties of the satellite and changes in baseline length.Consequently,the baseline tilt angle error has an effect on four-pass D-InSAR.The uncertainty of slant range is determined by the delay of the troposphere and ionosphere to the space-borne SAR satellite radio transmission,sampling clock jitter,and uncertainties of timing system of the SAR satellite,for which the interference phase of the InSA
出处
《地震工程学报》
CSCD
北大核心
2013年第2期296-301,共6页
China Earthquake Engineering Journal
基金
国家自然科学基金项目(41274007)
山东省自然科学基金项目(ZR2012DM001)
山东科技大学科研创新团队支持计划(2011KYTD103)
