关于布设GPS大地-水准网的建议

A PROPOSAL CONCERNING ESTABLISHING A GPSGEODETIC-LEVELLING NETWORK

本文建议在我国布设一个有数百点组成的GPS大地-水准网，以加强天文大地网，控制天文重力水准网和精化大地水准面。建议的GPS大地-水准网分两级布设，一级网精度指标为0 1ppm，二级网精度指标为1ppm，GPS点布设在一等三角锁交叉处，锁环中央，一二等导线节点处和导线环内部。模拟计算表明，这个网的水平位置误差平均为0 21米，分辨率大约为156公里的高程异常误差平均也为0 21米，在GPS大地-水准网的控制下，天文大地网内任意点的位置精度将好于0 3米，在天文重力水准路线上高程异常精度可能好于0 6米。

: It is proposed in the paper that a GPS geodetic-levelling network(GPSGLN) consisting of hundreds of points on a national scale be established to strengthen the astroge-odetic network, control the astrogravimetric levelling network and refine the geoid. The proposed GPSGLN should be laid out in two tiers, with the primary net measured at a 0.lppm level and the secondary with a Ippm precision. GPS points should be deployed at the junctures of first-order triangulation chains, in the central area of triangulation loops, at the nodal points of first and second order traverses and within traverse loops. Simulation study shows that in the GPSGLN the error in horizontal po sition would be on the average 0.21m and the error in height anomaly 0.21m as well with a 156km resolution. Under the control of the GPSGLN the positional precision for anyv points in the astrogeodetic network would be better than 0.3m, and the precision of height anomaly on the astrogravimetric levelling route might be better than 0.6m.