Optimizing 915MHz WSN RF Signal Propagation based on In-field Tests
The objective of this study was to evaluate in-field radio frequency signal propagation at 868/915MHz band wireless sensor network (WSN) links. Commercial wireless sensor motes using this band as transmitter was wirelessly connected to its corresponding receiver and a hand-held spectrum analyzer. Indexed packets transmitted from the transmitter were captured by a spectrum analyzer to measure path-loss and synchronously received by a receiver using equal mote model to calculate packet delivery rate. Experiments were implemented in a research field of Oklahoma State University where wheat was planted. Impact factors considered were: plant canopy height, transmitter height, receiver height, carrier frequency, transmitter-to-receiver distance (T-R distance). Results indicated that RF signal was subject to plant canopy height Univariate ANOVA results indicated in-field RF signal patb-loss was subject to system configurations and plant height as well as their interactions. Estimated marginal means plots indicated that the best performance in general, if taking all plant canopy heights into consideration, might happen when the transmitter was installed at a height of 2 m and the receiver was mounted at the height of 3 m.
path-loss wireless sensor networks signal propagation precision agriculture
Zhen Li Tiansheng Hong XueJun Yue Ning Wang
College of Engineering South China Agricultural University Guangzhou,China,510642 Dept.of Biosystems and Agricultural Engineering Oklahoma State University Stillwater,OK,USA,74078
国际会议
太原
英文
167-171
2011-02-26（万方平台首次上网日期，不代表论文的发表时间）