快速精密星历替代精密星历定位的初步研究
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摘要
由于GPS精密定位所需的IGS精密星历要在两周以后才能得到,因而利用两天后即可得到的快速精密星历、12小时后得到的超快速精密星历代替精密星历是GPS应用于地震短临预测的一个重要条件。本文利用北京市全球定位综合应用服务系统中五个GPS连续观测站一年半的数据,分别用三种星历进行精密定位计算,得到了小规模网中快速精密星历一般可以代替精密星历进行精密定位计算的结果。
As the IGS precise ephemeris which is used in GPS precise positioning(for example,in GAMIT software) can only be available in two weeks later,it is an important condition for using GPS data in the earthquake short-term prediction that taking the IGS rapid ephemeris which can arrives in two days and the IGS ultrarapid ephemeris which can be obtained in 12 hours,both with as nearly same preciseness as the precise ephemeris with,to replace the IGS precise ephemeris.In this paper,based on the observation data of 5 GPS continuous stations in the global positioning integrated application and services system in Beijing in one and half year,the precise located calculation is done by using three IGS satellite ephemeredes.The conclusion is that IGS rapid ephemeris can commonly replace the IGS precise ephemeris in calculation for small network.
As the IGS precise ephemeris which is used in GPS precise positioning(for example,in GAMIT software) can only be available in two weeks later,it is an important condition for using GPS data in the earthquake short-term prediction that taking the IGS rapid ephemeris which can arrives in two days and the IGS ultrarapid ephemeris which can be obtained in 12 hours,both with as nearly same preciseness as the precise ephemeris with,to replace the IGS precise ephemeris.In this paper,based on the observation data of 5 GPS continuous stations in the global positioning integrated application and services system in Beijing in one and half year,the precise located calculation is done by using three IGS satellite ephemeredes.The conclusion is that IGS rapid ephemeris can commonly replace the IGS precise ephemeris in calculation for small network.
引文
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[11]Darby D J,M eertens C M.Terrestrial and GPS m easurem ents ofdeformation across the Taupo back arc and H ikurangi forearc re-gion in New Zealand[J].J.G.R.,1996,23(22):3103-3106.
[2]甘卫军,沈正康,张培震,等.青藏高原地壳水平差异运动的GPS观测研究[J].大地测量与地球动力学,2004,24(1):29-35.
[3]王琪,牛之俊,石俊成.中国地壳运动观测网络基本站观测精度研究[J].大地测量与地球动力学,2003,23(3):9-13.
[4]顾国华,孙惠娟,孙汉荣.GPS形变检测网起算点坐标对水平形变的影响[J].地壳形变与地震,1999,19(1):43-48.
[5]顾国华,张晶.中国地壳运动观测网络基准站GPS观测的位移时间序列结果[J].大地测量与地球动力学,2002,22(2):61-67.
[6]陈智梁,张选阳,沈凤,等.中国西南地区地壳运动的GPS监测[J].科学通报,1999,44:32-35.
[7]孟国杰,赵承坤,顾国华,等.中国地壳运动观测网络首期观测数据处理[J].地震,2001,21(1):63-68.
[8]Shen Z K,Jackson D D,Ge B X.C rustal deformation across andbeyond the Los Angeles basin from geodetic m easurem ents[J].J.G.R.,1996,101(B12):27957-27979.
[9]Burchfiel B C,Chen Z,L iu Y,et al..Tectioics of the Longm enShan and ad jacent regions,central Ch ina[J].Intern.GelolgicalReview,1997,37(8):661-735.
[10]W essel P,Bercovici D.Interpolation w ith spline in tension:aG reen's Function approach[J].Mathermatical Geology,1998,30(1):77-93.
[11]Darby D J,M eertens C M.Terrestrial and GPS m easurem ents ofdeformation across the Taupo back arc and H ikurangi forearc re-gion in New Zealand[J].J.G.R.,1996,23(22):3103-3106.
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