摘要
中国国家Ａ级ＧＰＳ网共计２７点，均匀分布全国，平均边长约６５０ｋｍ，于９２年７月２５日至８月５日的９天（ＧＰＳ的２０８～２１７天）时间内，在全网同步持续进行ＧＰＳ双频观测。全网数据处理时，采用基准站技术，以国内外已有精密地心坐标和同步ＧＰＳ观测资料的ＧＰＳ基准站为加权控制数据，以ＩＴＲＦ９１为坐标框架，采用轨道松驰技术，利用ＧＡＭＩＴ软件进行数据处理，解算精度为单天解基线水平方向重复性是１０ｍｍ＋０．６×１０－８×Ｓ，垂直方向重复性优于４０ｍｍ＋０．５×１０－８×Ｓ，Ｓ为ＧＰＳ点间距离，以ｍｍ为单位。平差后基线水平方向相对精度约为１×１０－８，Ａ级网点在ＩＴＲＦ９１参考框架中的地心坐标精度优于０２ｍ。
China National A Order GPS Network is consisted by 27 stations, which is distributed evenly nationally and the average length of baselines is about 650km. During the period from July 25 to August 5 of 1992(i.e., from day 208 to day 217 of the year), All of GPS dual frequency receivers in the A Net sites were measured sumultaneously and continuously. Fiducial Point Technology and Relax Orbit Technology have been used for data processing of the A Order GPS Network. Some global tracking stations and the national tracking stations, which have accuracy ECEF coordinates and has observed data during the period, are constrained weightily to force the A Order GPS Network refer to ITRF91 Frame. GAMIT GPS analysis software was used for data processing. Results showed that for single day solutions, the repeatability of baseline horizontal components is 10mm+0.6×10 -8 × S , and the one of baseline vertical components is better than 40mm+0.5×10 -8 × S , where S is distace between GPS points with unit of mm. After network adjustment, the relative accuracy of baseline horizontal components is about 1×10 -8 . The ECEF coordinate accuracy of thd A Order points in ITRF91 Reference Frame is beter than 0.2m.
出处
《测绘学报》
EI
CSCD
北大核心
1996年第2期81-86,共6页
Acta Geodaetica et Cartographica Sinica
