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当前位置: 首页 > 文章 > 手持GPS在不同林分下的定位精度研究 北京林业大学学报 2008 (1) 163-167
Position: Home > Articles > Positioning precision with handset GPS receiver in different stands. Journal of Beijing Forestry University 2008 (1) 163-167

手持GPS在不同林分下的定位精度研究

作  者：
谭伟;王开琳;罗旭;王志杰
单  位：
贵州省紫云县林业局;中国科学院水利部水土保持研究所;贵州大学林学院;中国计量科学研究院
关键词：
手持GPS;郁闭度等级;测量时段;气候条件;定位精度
摘  要：
该文针对手持GPS(Magellan315/320)在不同林分条件,包括不同郁闭度等级(高、中、低)、不同测量时段(早、中、晚)和不同气候条件(晴、阴、多云、雾)下的定位精度进行研究。结果表明,在林下手持GPS定位精度与林分郁闭度、测量气候等因素关系密切,而与测量时段关系不大;在不同郁闭度下,定位精度与郁闭度等级呈反比关系;在不同天气条件下,晴天定位的精度好,误差变化幅度较其他天气条件平稳;测量时段与定位精度无关,仅是与开机时间有关系,其精度在5～15 min内为最佳测量时段。
译  名：
Positioning precision with handset GPS receiver in different stands.
作  者：
TAN Wei~1 WANG Kai-lin~(1,2) LUO Xu~3 WANG Zhi-jie~1 1 Forestiy College,Guizhou University,Guiyang,550025,P.R.China;2 Ziyun Forestry Burearu of Guizhou,Ziyun,550800,P.R.China;3 Length Division,China National Institute of Metrology,Beijing,100013,P.R.China.
关键词：
handset GPS receiver;;crown density;;surveying period;;weather condition;;positioning precision
摘  要：
Using handset GPS receiver,Maggellan315 /320,the positioning precision was studied in different stand conditions,including different canopy densities,weather conditions and measuring periods.The canopy was divided into lower (0.1-0.4).middle (0.5-0.7) and high (0.8-1.0) densities.The weather conditions were sunny,overcast,cloudy and foggy.The GPS signal was received for 30 minutes in the morning,noon and afternoon of a day,respectively.The results show that the precision was closely related to the surveying conditions,such as forest canopy and weather,but irrelevant with the measuring period.The value of error expanded with the increase of crown density.The error amplitude under sunny weather remained more stable than that in other weather conditions.The first 5-15 minutes after the startup of GPS receiver was the optimum time for measuring.

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