摘要
讨论甚长基线干涉测量(VLBI)、卫星激光测距(SLR)和全球定位系统(GPS)3种空间观测技术在测定地壳运动中是否存在系统差。在考虑垂向变化率的情况下,用地心坐标速度解算并置站间基线长度变化率;然后对这3种技术的基线长度变化率进行两两线性拟合,并进行相关性分析。计算结果表明,3种观测技术测定的地壳运动是一致的:VLBI和GPS测定的基线长度变化率差异较小,比SLR的相应值系统性偏大约10%;GPS与SLR测定的基线长度变化率值有约3mm/a的常数差,而VLBI与SLR测定的基线长度变化率相应值有不到1mm/a的常数差。
It is dicussed whether the systematic errors exist or not in crustal movement monitoring by three space observation techniques i.e. VLBI, SLR and GPS. Taking account of vertical change rate, the baseline length changing rates of co-located sites are solved by use of velocity of geocentric coordinations, and these rates are fitted pair to pair, and then their correlativities are analyzed. The computed results show that the crustal movements measured by this three techniques are consistent with each others：the difference between the baseline length changing rates by VLBI and GPS is small, and about 10% larger than that by SLR,there is a constant difference of about 3 mm/a between those by GPS and SLR,but less than 1 mm/a between those by VLBI and SLR.
出处
《大地测量与地球动力学》
CSCD
北大核心
2008年第1期127-130,共4页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金项目(40474014)
