摘要
选取2020—2022年地球定向参数(earth orientation parameters,EOP)数据,利用傅里叶变化和小波分析的方法对这3年的EOP进行时频分析,通过对比其和其他不同年份的数据的频谱,找出2020—2022年EOP周期项的变化特征:极移Xp减少两个60 d以下小周期项,周年项周期振幅增加0.008 02 as,增加比率为7.8%,极移Yp增加两个60 d以下小周期项,周年项振幅增加0.001 304 as,增加比率为14%,二者均缺失钱德勒项周期;章动X方向增加了7个30 d以下小周期项,减少了1个120 d周期项,减少了4个20~30 d周期项,章动Y增加了2个40 d左右周期和2个30 d以下小周期项;日长变化周期项虽然没有增减变化,但周年项振幅增加了0.053 547 mas,增加比率为13.74%;半年项振幅增加了0.021431mas,增加比率为6.5%;月项振幅增加了0.022 003 mas,增加比率为12.57%;半月项振幅增加了0.135006mas,增加比率为57.2%;9d项振幅增加了0.022 588 mas,增加比率为37.94%。
This article selects the EOP data from 2020 to 2022,and use the Fourier transform and wavelet analysis methods to analyze the time-frequency of EOP in these three years.By comparing the spectra of the data from 2020 to 2022 with those from other different years,the changing char-acteristics of EOP cycle terms from 2020 to 2022 are identi-fied:the pole shift Xp reduces two small cycle terms below 60 days,the annual term cycle amplitude increases by 0.00802 as,an increase rate of 7.8%;the pole shift Yp in-creases two small cycle terms below 60 days,and the annual term amplitude increases by 0.001304 as,an increase rate of 14%;both are missing Chandler term period;In the X direc-tion of nutation,7 small period items below 30 days were add-ed,one 120 days period item was reduced,and four 20~30 days period items were reduced.In the Y direction of nuta-tion,two small period items around 40 days and two small pe-riod items below 30 days were added;The period term of dai-ly variation does not show any increase or decrease,but the amplitude of the annual term increases by 0.05354 mas,with an increase rate of 13.74%;The amplitude of the half year term increased by 0.02143 mas,with an increase rate of 6.5%;The monthly amplitude increased by 0.022 mas,with an increase rate of 12.57%;The amplitude of the semi lunar term increased by 0.135 mas,with an increase rate of 57.2%;The amplitude of item 9 days increased by 0.02259 mas,with an increase rate of 37.94%.
作者
魏二虎
谢清扬
张云龙
李岩林
田晓静
刘经南
WEI Erhu;XIE Qingyang;ZHANG Yunlong;LI Yanlin;TIAN Xiaojing;LIU Jingnan(School of Geodesy and Geomatics,Wuhan University,Wuhan 430079,China;Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences,Harbin 150081,China;China Railway Design Corporation,Tianjin 300251,China;Geodetic Data Processing Center,Ministry of Natural Resources,Xi’an 710054,China;GNSS Research Center,Wuhan University,Wuhan 430079,China)
出处
《测绘地理信息》
2025年第4期15-21,共7页
Journal of Geomatics
基金
国家自然科学基金(42374015)
国家重点研发计划(2018YFC1503600)
天津市轨道交通导航定位及时空大数据技术重点实验室开放课题基金(TKL2024B04)
关键词
地球定向参数
最小二乘法
傅里叶变换
小波分析
频谱分析
earth orientation parameters
least squares meth-od
Fourier transform
wavelet analysis
spectral analysis
