2009年4月
Effects of moisture in wood materials on the SNR of GPS signals
JOURNAL OF FOREST RESEARCH
- ,
- ,
- 巻
- 14
- 号
- 2
- 開始ページ
- 63
- 終了ページ
- 72
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1007/s10310-009-0112-1
- 出版者・発行元
- SPRINGER TOKYO
This study was performed to investigate the factors responsible for the reduction in the signal-to-noise ratio (SNR) of a global positioning system (GPS) when used in a forest. We investigated the relationship between the SNR values of GPS signals and the moisture in wood materials and clarified this relationship through experimentation and simulation. Although the wood material itself had a minimal effect on SNR reduction, moisture in the wood had an obvious effect. It is noteworthy that wood material with a moisture resistance quantity (Mw) of 2 g/cm(2) caused a reduction of more than similar to 10 dB in the SNR. This Mw value corresponds to Japanese cedar with a green stem thickness of similar to 7 cm. Under unobstructed sky conditions, SNR is less than similar to 20 dB, so a reduction of 10 dB has a marked effect on GPS reception. The reduced SNR under canopies resulted from moisture in stems and the canopy. Furthermore, a simulation performed in a Japanese cedar forest revealed that 77.8% of the SNR reduction was caused by stems, 8.1% by branches, and 14.1% by needles.
- リンク情報
- ID情報
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- DOI : 10.1007/s10310-009-0112-1
- ISSN : 1341-6979
- Web of Science ID : WOS:000264520900001