摘要
本项目组于1993年7月至8月,对青藏高原的地壳运动进行第1期监测,并用广播星历进行解算.1994年秋,又使用经武汉测绘科技大学改进到微机上的美国麻省理工学院研制的GAMIT精密定位软件和NGS(NationalGeodeticSurvey)精密星历,重新进行解算.解算结果表明,在400多公里范围内,观测两个时段平均基线的重复性达到几毫米的高精度,相对精度优于3.10×10(-8),与广播星历解相比,基线重复精度提高了5~12倍.
The study on the Crust Movement and Deformation in QH-XZ plateau yis GPS observation' is a key subject supported by the Fund of National Natural Science. Its purposes are to establish a high-precision GPS network for the investigation of crust movement and deformation in QH-XZ plateau, and to incorporate it with geology and geophysics to study the crust movement and earth-dynamics. The GPS observation of the crust movement in QH-XZ plateau was carried out forthe first time last year. The software TOPAS and GPS broadcast ephemeris were utilized firstly to process the GPS raw data. The precise positioning software GAMIT, which was developed by Massachusettes College of Science and Engineering and improved by Wuhan Technical University of Surveying and Mapping, and NGS precise ephemeris were used to process the same set of data this year, and the results indicate that the accuracies for the repeatability of the baselines, which are up to 480 km. are olny a few millimeters and the relative precision of the baseline is better than 3. 1 × 10(-8).The accuracies obtained by using GPS precise ephemeris are about 5 to 13 times better than using GPS broadcast ephemeris.
出处
《陕西天文台台刊》
CSCD
1996年第1期75-83,共9页
Publications of The Shaanxi Astronomical Observatiory
基金
国家自然科学基金
"八五"重点项目
关键词
地壳运动
GPS
精密星历
地壳变形
Crust Movement and Deformation
GPS
Broadcast Ephemeris
Precise Ephemeris