Behavior of GPS Signal Interruption Probability under Tree Canopies in Different Forest Conditions
Behavior of GPS Signal Interruption Probability under Tree Canopies in Different Forest Conditions
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DOI：
10.5721/eujrs20134636
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发表时间：
2013-01-01
影响因子：
4
通讯作者：
Hasegawa, Hisashi
中科院分区：
文献类型：
--
作者：
Bastos, Alex Souza;Hasegawa, Hisashi
全球定位系统(GPS)在4种不同的森林环境中进行了一年多的调查，以观察信号中断概率(SIP)、林冠开放指数、观测周期、可用卫星数量和位置精度稀释(PDOP)之间的交互作用。在水平和垂直方向上，SiP与位置误差的相关性都高于冠层开放指数或PDOP，这与以往的一些研究形成了鲜明的对比。长达15分钟的观察期提供了与SIP相关的可接受的位置精度。通过像SIP这样的指标，树冠结构本身和信号行为可以更好地理解林业的准确性。
Global Positioning System (GPS) surveys were conducted over one year in four different forest environments in order to observe interactions between signal interruption probability (SIP), canopy opening index, observation period, number of available satellites and positional dilution of precision (PDOP). SIP showed larger correlation to positional errors than canopy opening index or PDOP, both horizontally and vertically, which contrast with some previous studies. An observation period of up to 15 minutes provided acceptable positional accuracy in correlation with SIP. Through indexes like SIP, canopy structure itself and signal behavior can provide a better understanding of accuracy in forestry.