用无线传感器网防动物偷吃庄稼，还能自动发短信提醒农民。
Safe Farming: Development of a Prevention System to Mitigate Vertebrates Crop Raiding
- 部署无线传感器网络监测农田动物活动。
- 触发超声波驱赶装置，人听不到但动物害怕。
- 低成本低功耗，适合发展中国家使用。
农民在作物种植及收获前后常面临动物和鸟类侵扰的问题。为此，本文提出一种安全耕作模式，通过基于无线传感器网络的预防系统保护作物。田间布置多个传感器节点，检测动物或鸟类存在并生成信号信息，通过短距离无线技术ZigBee传输至现场安装的驱赶与通知系统（RNS）。RNS接收到信息后，发出人类无法察觉但对动物和鸟类极为不适的超声波，使其逃离农田。同时，系统具备通知功能，通过SMS自动向农民发送入侵警报，无需人工干预。该系统具有低成本、低功耗优势，特别适用于对成本和电力供应敏感的发展中国家。
原文摘要 · Abstract (English)
One of the main problems for farmers is the protection of their crops, before and after harvesting, from animals and birds. To overcome this problem, this paper proposes a model of safe farming in which the crops will be protected from vertebrates attack through a prevention system that is based on Wirelesses Sensors Networks. Different sensor nodes are placed around the field that detect animals or birds existence and generate required signals and information. This information is passed to the Repelling and Notifying System (RNS) that is installed at the field through a short range wireless technology, ZigBee. As RNS receives the information, it generates ultrasonic sounds that are unbearable for animals and birds, which causes them to run away from the field. These ultrasonic sounds are generated in a frequency range that only animals and birds can hear, while humans cannot notice the sound. The paper also proposes a notifying system. It will inform the farmer about animals or birds intrusion in the field through SMS, but doesn't need any action from the farmer. The low cost and power efficiency of the proposed system is a key advantage for developing countries where cost and power are major players in any system feasibility.
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