以基线长度变化率为约束估算VLBI站的垂直形变率  

ESTIMATIONS OF VERTICAL DEFORMATION RATES OF VLBI STATIONS BY CONSTRAINTS OF RATES OF BASELINE LENGTH CHANGE

作　　者：杨志根[1,2,3] 朱耀仲[2] 

机构地区：[1]中国科学院上海天文台 [2]中国科学院测量与地球物理研究所,武汉430077 [3]上海伽利略导航有限公司,上海200233

出　　处：《中国科学院上海天文台年刊》2005年第1期7-13,共7页Annals Shanghai Astronomical Observatory Chinese Academy of Sciences

摘　　要：基于NNR-NUVEL-1A地球板块运动模型和ITRF2000地球参考架的三维VLBI站速度矢量,采用实测的VLBI基线长度变化率作为约束,重新估计了部分国际VLBI站的局部或区域性地壳的垂直形变,并与国际地球参考架ITRFs解和VLBI全球解GLB2003,VTRF2003和VTRF2005的结果进行了比较。结果表明,欧亚板块的URUMQI站和太平洋板块的KWAJAL26站,南极OHIGGINS站的垂直形变率、ITRFs解和VLBI全球解存在6-15mm/a的差异,北美YUMA站可能有15-31mm/a 的垂直形变率,而美国西部太平洋板块的San Francisco(PRESIDIO)站的垂直形变率还有待进一步的研究。此外,SC-VLBA,CRIMEA和EFLSBERG站的垂直形变率、ITRFs解和VLBI全球解的差约为1-6mm/a。用不同方法得到的VLBI站的水平形变率解有较好的一致性。International terrestrial reference frame （ITRF）solutions, such as ITRF2000, are combination solutions using different space geodetic techniques and could have potential ＂ inconsistencies＂ between various realizations. At present, the estimated average uncertainty on regularly observed baselines for change of the VLBI baseline length is better than 1.0 mm/a. Based on the 3-dimensional velocity vectors of VLBI stations in ITRF2000 and the earth＇ s plate motion model NNR-NUVEL-1 A, the local/regional deformation rates of eight VLBI stations are estimated using the observed rates of change of VLBI baseline lengths as parameter constraints. Comparisons of the results with those of the ITRFs solutions and GLB2003, VTRF2003, VTRF2005 solutions （Nothnagel, 2003, 2005 ） are completed. The observed baseline rates as constraints are adopted in this paper and the possible deformations at a local/regional spatial scale, for isolating the potential ＂inconsistencies＂ from the TRF solutions, are addressed for the accurately realization and maintenance of ITRF.

关 键 词：ITRF2000地球参考架 NNR-NUVEL-1A板块运动模型 VLBI基线长变化率 VLBI站的局部或区域性的地壳垂直形变 

分 类 号：P228.6[天文地球—大地测量学与测量工程]