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《Journal of Beijing Forestry University》 2004-02
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Effects of crown cover and hill country on RTD GPS positioning precision and corresponding reducing countermeasures

Nie Yuzao; Feng Zhongke; Deng Xiangrui; Wang Xiaokun. School of Resources and Environment, Beijing For. Univ., 100083, P. R. China.  
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.
【Fund】: 国家自然科学基金资助项目“林冠山地对实时差分GPS定位影响机理及消减对策研究”( 3 0 0 70 619)的部分内容
【CateGory Index】: S771
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