林冠与山地对GPS定位精度的影响及消减对策

为解决林冠与山地对RTDGPS定位精度影响的难题 ,作者在不同地类、不同地形、不同测程、不同林冠下进行RTDGPS复测实验 ,并获得数据 .通过数据统计分析 ,得出RTDGPS定位精度随上述因素变化的具体规律 .提出了应用高增益天线法、砍树剥枝法、升高天线高于树冠法、伪卫星法、GLONASS法、差分GPS +气压计法、延长观测时间法、插转台法等多种对策 ,在测区内高处设置插转台进行观测、选取适当的觇标高、选用适当的历元数等手段 ,通过增强GPS接收卫星的信号 ,提高定位精度 ,消减林冠、地形、测程等因素对RTDGPS定位效果的影响

Effects of crown cover and hill country on RTD GPS positioning precision and corresponding reducing countermeasures

In order to reduce the effects of crown cover and hill country on RTD GPS positioning precision, this paper, based on the statistical analyses with the data of RTD GPS resurveying test on different land types, topographies, ranges and crowns, puts forward the rule that RTD GPS positioning precision changes with those factors. Then the authors bring forward several corresponding reducing countermeasures, such as high gain antenna, cutting trees and shelling branches, lifting antenna to above crown, pseudo satellite, GLONNASS, DGPS and barometer, prolonging observation time and setting turning stations. In these ways, the signal got from the satellites can be increased, positioning precision of GPS can be improved and the effects of crown cover, hill country and survey range on RTD GPS positioning precision would be reduced.