GPS accuracy in using antenna pole under tree canopies and usability of Signal Interruption Probability (SIP) for accuracy estimation

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  • 樹冠下におけるアンテナポールを用いた場合のGPS測位精度と精度評価におけるGPS信号の遮断確率(SIP)の有用性

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Abstract

Global Positioning System reception quality was observed under tree canopies using four different antenna heights in four different forest environments bimonthly in a mountain area in Kyoto, Japan. After post-processing, relationship among GPS reception quality, canopy opening index evaluated from hemispherical photographs, and Signal Interruption Probability (SIP), which indicates segmentation of GPS signal reception, were analyzed considering the horizontal error calculated by using code differential correction. The results show that because of high levels of interference from the canopy, mid-height antennae had the tendency to provide more reliable results as long as the antenna pole could be stabilized. GPS reception quality decreased in higher antennae due to antenna pole bending and wobbling. Although the canopy opening index expressed seasonal changes of canopy structure, especially at the deciduous point, SIP was a more significant factor related to GPS horizontal errors, which are affected mainly by stems or large branches. These results suggest that SIP has a better usability in estimating GPS accuracy than the canopy opening index, and furthermore, SIP may express the forest canopy structure, especially on stems and branches.

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