| 郑少雄1,2，王卫星1,2，胡浩民2，孙宝霞1,3，雷刚1，张雄1，洪炳星1.基于定向天线的稻田环境监测WSN
网关设计与组网试验研究[J].广东农业科学,2014,41(3):204-211 |
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基于定向天线的稻田环境监测WSN
网关设计与组网试验研究 |
| Study on basic agricultural information extractionof Combodia based on MODIS data |
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| DOI： |
| 中文关键词: 无线传感器网络 环境监测 网关 通信协议 稻田 |
| 英文关键词: Cambodia agriculture flood MODIS |
| 基金项目:广东省科技计划项目（2010B020315021，2011B0
20313019） |
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| 摘要点击次数: 1553 |
| 全文下载次数: 644 |
| 中文摘要: |
| 为了实现稻田环境信息的实时监测，设计了一种基于定向天线无线传感器网络的稻田环境信息监测系
统，并对其网关进行设计。网关节点设计以MSP430F149 为核心，外围以nRF905 射频芯片和节点通信，节点采用土
壤水分传感器TDR-3 和空气温湿度传感器DHT22 对稻田环境信息进行实时采集与处理，选用MC55 作为GPRS 通
信模块，实现了稻田环境信息的远程传输与监控等功能。在该硬件平台编写硬件驱动程序和通信协议、异常短信报
警程序和时间同步协议。测试了网关节点的通信距离、功耗、存储速率，对网关的实用性进行实地试验，网关节点通
信距离可达331.18 m，1 h工作周期下可持续工作32 d，数据存储速率达849.7 kbps，组网试验结果表明，内网平均丢
包率为0.686%，外网平均丢包率为0.712%，传感器节点采集数据稳定，能够满足稻田环境信息监测的需求。 |
| 英文摘要: |
| In recent years, under the framework of GMS, the cooperation between China and Cambodia is becoming
wider, agriculture is an important field. Accurate agricultural information is essential to enable two sides to make informed
decisions. Based on the agricultural knowledge, time series MODIS data and other data, the agricultural characteristics and
the relationship with the flood were extracted and analyzed. The result showed that one cropping system was commonly
employed in Cambodia. Double-cropping system was mainly distributed in the Mekong Delta. The starting date of growing
season, the ending date of growing season and date of maximum NDVI generally occurred from July to September, from
November to December and from May to June, respectively. Each year, the west -south monsoon occurring from May
generally caused serious flood in Cambodia which then exerted great influence on the cropping patterns. Therefore,
understanding the current status of flood inundation and its relationship with cropping practice in time and space was
important. It was found that from the early May to middle September, the flood begin, and about two months later about
84% of crops began to grow. From middle August to middle November, about 58% of flood began to subside. About one
month later, the peak of time series NDVI began to occur. From November to January of next year, about 76% of crop爷s
growing season began to end. |
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