【摘要】 近20年累积的全球IGS基准站位置时间序列呈现显著的非线性变化,尤其是高程方向的季节性变化。随着各研究领域对大地测量成果所要求的精度越来越高,大地点位的非线性时变越来越受到关注。本文详细阐述了造成基准站非线性变化的成因,包括与GPS相关的技术类系统误差、地球物理效应、接收机及天线变化、地震引起的突变、噪声影响等,研究了消除或减弱各种非线性变化的方法及途径。更多还原

【Abstract】 The global IGS base station practice sequence accumulated over the past 20 years showed a significant nonlinear changes,especially seasonal changes in elevation direction. With the precision of geodetic results in research fields is getting higher and higher,people pay more attention on the earth point nonlinear time- varying. This paper elaborates the causes of nonlinear changes of the base station,including technical system error associated with GPS,geophysical effects,mutations caused by receiver and antenna changes and earthquakes,noise effect,etc.,studying the methods and ways to eliminate or weaken the nonlinear changes.更多还原