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溫室青椒中2.4 GHz無(wú)線電波傳播特性研究
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科技型中小企業(yè)技術(shù)創(chuàng)新基金資助項(xiàng)目（11C26213204549）、江蘇省農(nóng)業(yè)科技支撐計(jì)劃資助項(xiàng)目（BE2010347）、江蘇省產(chǎn)學(xué)研聯(lián)合創(chuàng)新資金資助項(xiàng)目（BY2013065-07）和江蘇高校優(yōu)勢(shì)學(xué)科建設(shè)工程資助項(xiàng)目


Propagation Characteristics of 2.4 GHz Radio Wave in Greenhouse of Green Peppers
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    摘要:

    為解決溫室中無(wú)線傳感器網(wǎng)絡(luò)的規(guī)劃和部署問(wèn)題，探討作物對(duì)無(wú)線電波傳播特性的影響，研究了種植青椒的溫室中2.4 GHz無(wú)線信號(hào)在不同方向和高度下的傳播特性。通過(guò)試驗(yàn)實(shí)地測(cè)量了3個(gè)方向和2個(gè)高度下接收信號(hào)強(qiáng)度和丟包個(gè)數(shù)，并通過(guò)Matlab對(duì)試驗(yàn)數(shù)據(jù)進(jìn)行回歸分析。結(jié)果表明：不同方向和高度下，青椒中無(wú)線信道傳播特性符合對(duì)數(shù)路徑衰減模型，擬合相關(guān)系數(shù)在0.900 7和0.947 3之間；傳感器節(jié)點(diǎn)在青椒中的不同高度決定著青椒中2.4 GHz無(wú)線電波的傳播特性，對(duì)無(wú)線信道傳播特性的影響較為顯著，而傳播方向?qū)η嘟分袩o(wú)線信號(hào)的影響較弱。同時(shí)得到了青椒中傳感器節(jié)點(diǎn)最宜部署在青椒冠層及以上位置，為無(wú)線傳感器網(wǎng)絡(luò)在種植青椒的溫室中的節(jié)點(diǎn)部署提供了技術(shù)支持。

    Abstract:

    In order to configure wireless sensor networks system and node deployment in greenhouse, this paper researched propagation characteristics of 2.4 GHz wireless channel at different directions and heights in greenhouse of green peppers. Received signal strength and packet loss numbers were investigated by field testing measurements at three directions and two heights. Regression analysis results showed that the radio channel propagation characteristics in different directions and heights of green peppers accorded with logarithm distance path loss model, and the fitting correlation coefficients between computational values and measurement values were between 0.900 7 and 0.947 3. Different heights of sensor nodes in the green peppers determined the radio wave propagation characteristics. Besides, validation results showed that it was the best to deploy the sensor nodes antennas at the top of green peppers canopy or above of it in greenhouse. This research can provide technical support for WSN application in greenhouse.

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李萍萍,彭玉禮,王紀(jì)章.溫室青椒中2.4 GHz無(wú)線電波傳播特性研究[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2014,45(2):251-255. Li Pingping, Peng Yuli, Wang Jizhang. Propagation Characteristics of 2.4 GHz Radio Wave in Greenhouse of Green Peppers[J]. Transactions of the Chinese Society for Agricultural Machinery,2014,45(2):251-255.

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  • 收稿日期:2013-03-05
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  • 在線發(fā)布日期: 2014-02-10
  • 出版日期: 2014-02-10