天宝Trimble 5800单点定位在林业测量中的应用探析

Application of single point positioning with Trimble 5800 in forest measurement

检测了全球定位系统(GPS)接收机天宝Trimble 5800在复杂地形中的定位精度和在林业测量中应用的可行性。研究表明:天宝Trimble 5800GPS接收机在不同地形中单点定位时,WGS-84坐标的内符合精度为0～2m占65%,2～5m占30%,最大偏差<8m;经坐标转换后,各历元观测平均值的BJ-54坐标外符合精度都<5m,在0～5m分布均匀,因此,在同一作业时间段,以在已知点上获得观测值与已知值的偏差值作为其他观测点观测值的改正参数,将有效提高定位精度;在距离和面积测量中,以全站仪测量数据为参考值,天宝Trimble 5800单点定位的相对误差分别优于1/300和1%,比手持GPS定位精度高。

The positioning precision of the high-performance GPS （global positioning system） receiver-Trim- ble 5800 and its feasibility measuring in the complex forest terrain was tested. The results show that when Trimble 5800 GPS receiver dose single point positioning in difference terrain, the 65% inner precision of WGS-84 coordinates is 0 - 2 m and 30% of it is 2 - 5 m, its maximum deviation is less than 8 m. The outer precision of the average observations is less than 5 m, and evenly distributes in 0 - 5 m after coordi- nate transformation. As a result, if it takes the deviation between known coordinate and observations on a known point as the correct parameter of other points＇ observations measured in the same timerange, this will effectively improve the positioning precision. In the distance and area measurement, the relative error of single point positioning with Trimble 5800 is less than 1/300 and 1% when the datum measured by Total Staions were taken as reference value, so Trimble 5800 receiver＇ precision is better than the precision of handy GPS. [Ch, 1 fig. 8 tab. 8 ref. ]