国际地球参考框架ITRF2014评析  

Evaluatioii and analysis of the International Terrestrial Reference Frame 2014

作　　者：明锋 曾安敏[1,2] MING Feng;ZENG Anmin(Xi'an Research Institute of Surveying and Mapping, Xi'an 710054, China;State Key Laboratory of Geo-Information Engineering, Xi'an 710054, China)

机构地区：[1]西安测绘研究所,陕西西安710054 [2]地理信息工程国家重点实验室,陕西西安710054

出　　处：《测绘科学与工程》2019年第1期12-21,共10页Geomatics Science and Engineering

摘　　要：国际地球自转服务组织IERS于2016年1月22日发布了最新的国际地球参考框架ITRF2014。相对于ITRF2008,ITRF2014在测站坐标运动学模型中增加了两个非线性项,即季节项和震后形变。由于更加精确地描述了测站的位移,ITRF2014的精度要优于ITRF2008。然而,ITRF2014的函数模型增加了新的季节项参数,且季节项参数与转换参数线性相关。因此,框架实现时必须对新增加参数施加对应的约束条件。不同的约束方式会导致不同的ITRF实现。本文详细介绍了国际地球参考框架建立中的基本理论概念,回顾了建立框架时可能用到的各种约束方式,对ITRF2014所用的坐标运动模型进行了分析,并对其季节性信号存在的问题进行了评述。The latest International Terrestrial Reference System (ITRS),International Terrestrial Reference Frame 2014 (ITRF2014) has been released by the International Eartli Rotation Service on 22 Januaiy 2016.Compared with the ITRF2008,the ITRF2014 has incorporated two non-linear terms,seasonal signals and post-seismic deformation.Owing to the more accurate description of station movement,the precision of the ITRF2014 is better than that of the ITRF2008.However,since the ITRF2014 added the seasonal parameters which are linearly dependent on tlie transformation parameters,corresponding constraint conditions should be applied to the newly-added parameters.Different constraint conditions would lead to different realization of ITRS.In tliis papert the basic concept of the ITRF has been introduced in detail,and different constraint conditions that may be used to establish the ITRF have been reviewed.The coordinate kinematic model of the ITRF2014 is also analyzed,and the problems of seasonal signals are evaluated and analyzed.

关 键 词：国际地球参考框架 最小约束 内约束 坐标运动模型 ITRF2014 

分 类 号：P228[天文地球—大地测量学与测量工程]