毕业论文外文翻译--无线网络的灌溉控制和传感.docx

W IR ELES S NETW OR K FOR IR R IGATIONCONTR OL AND S ENS INGVariations in plant water and nutrient demand and environmental regulations to protect water quality provide significant justification for site‐specific irrigation and fertigation systems. We have developed wireless valve controllers that self‐assemble into a mesh network. Mesh networking means that controllers pass messages to extend the effective communication range without using high‐power radios. Solar energy is collected with a 200mW panel to operate each controller node without yearly battery replacement. Nine nodes were tested in a mesh network, and each properly responded to commands. Measurements of battery voltage, solar panel voltage, enclosure temperature, and external sensors were transmitted every 10 min. Irrigation schedules were stored locally on each node and executed automatically. Schedules for each node were unique, based on the needs of the particular area being irrigated. Internal clock drift was an average 6.3s per day. Clock offset was removed using daily time stamps. One‐hop transmission range using 916MHz radios varied from 20.9 m with a whip antenna at ground level to 241.1m with a dipole antenna at 3m. Node commands were acknowledged after an average of 2.7s per hop. Charge consumption was approximately 7.03mA·h per day for the node circuit and 1 mA·h per day for battery self‐discharge. The solar panel produced 26.0 to 81.3 mA·h in direct sunlight and 6.5 to 13.7mA·h in shade. Node operation is expected to be continuous with occasional sunlight exposure. Soil moisture, pressure, temperature, and other environmental sensors will be used for feedback control and detection of problems. Such a network of intelligent valve controllers will allow growers in orchards, vineyards, nurseries, greenhouses, and landscapes to develop management practices that improve water‐ and fertilizer‐use efficiency.Conventional irrigation management provides water and nutrients