In recent years, ground-based micro-deformation monitoring radar has attracted much attention due to its excel-lent monitoring capability. By controlling the repeated cam-paigns of the radar antenna on a fixed track, ground-based micro-deformation monitoring radar can accomplish repeat-pass interferometry without a space baseline and thus obtain high-precisiondeformationdataofalargesceneatonetime.However,itis difficult to guarantee absolute stable installation position in every campaign. If the installation position is unstable, the stability of the radar track will be affected randomly, resulting in time-varying baseline error. In this study, a correction method for this error is developed by analyzing the error distribution law while the spa-tial baseline is unknown. In practice, the error data are first iden-tified by frequency components, then the data of each one-di-mensional array (in azimuth direction or range direction) are grou-ped based on numerical distribution period, and finally the error is corrected by the nonlinear model established with each group. This method is verified with measured data from a slope in sou-thern China, and the results show that the method can effective-ly correct the time-varying baseline error caused by rail instability and effectively improve the monitoring data accuracy of ground-based micro-deformation radar in short term and long term.

LEI Tianjie;WANG Jiabao;HUANG Pingping;TAN Weixian;QI Yaolong;XU Wei;ZHAO Chun

China Institute of Water Resources and Hydropower Research,Beijing 100038,China;Institute of Environment and Sustain-able Development in Agriculture,Chinese Academy of Agricultural Sciences,Beijing 100083,China;College ofGeoscience and Surveying Engineering,China University of Mining and Technology,Beijing 100098,China;College of Information Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;Inner Mongolia Key Laboratory of Radar Technology and Application,Hohhot 010051,China

系统工程与电子技术（英文版）

[1]LEI Tianjie;WANG Jiabao;HUANG Pingping;TAN Weixian;QI Yaolong;XU Wei;ZHAO Chun-.Time-varying baseline error correction method for ground-based micro-deformation monitoring radar)[J].系统工程与电子技术（英文版）,2022(04):938-950

paigns,precisiondeformationdataofalargesceneatonetime,grou,sou,thern

Time,varying,baseline,error,correction,method,ground,micro,monitoring,radar,In,recent,years,has,attracted,much,attention,due,its,excel,lent,capability,By,controlling,repeated,antenna,fixed,track,can,accomplish,pass,interferometry,without,space,thus,obtain,high,However,itis,difficult,guarantee,absolute,installation,position,every,campaign,If,unstable,will,be,affected,randomly,resulting,this,study,developed,by,analyzing,distribution,law,while,tial,unknown,practice,are,first,iden,tified,frequency,components,then,each,mensional,array,azimuth,direction,range,numerical,period,finally,corrected,nonlinear,model,established,group,This,verified,measured,from,slope,China,results,show,that,caused,rail,instability,effectively,improve,accuracy,short,term,long

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