| 张连宽，肖德琴，李就好.基于无线传感器的作物图像传输方法[J].广东农业科学,2013,40(15):176-179 |
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基于无线传感器的作物图像传输方法 |
| Crop image transmission in wireless image sensor networks |
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| DOI： |
| 中文关键词: 无线图像传感器 作物图像 纠错码 图像传输 |
| 英文关键词: wireless image sensor networks crop image error correction code image transmission |
| 基金项目: |
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| 摘要点击次数: 1288 |
| 全文下载次数: 692 |
| 中文摘要: |
| 采用无线图像传感器网络采集作物图像可以充分应用其大范围、实时的特点获得丰富的作物状态信息，并为科学决策提供依据。然而由于大田环境下易受到各种因素的干扰，无线图像传感器网络不能稳定地传输图像。通过试验发现，数据在大田环境下的无线信道传输过程中由于受到干扰而出现不同程度的错误特点，在此基础上提出了基于纠错码和重传机制的无线图像传输方法FEC-ARQ。FEC-ARQ 先根据无线传输模块的数据包长度限制和无线传感器节点运算能力设定纠错码的码长，再根据传输过程中检测的传输错误率，设定纠错码。在传输的过程中，由于错误率并不稳定而出现纠错码无法纠正数据包错误数据的情况，在检测到纠错码不能纠错时，采取重传机制。仿真结果表明：采用的纠错码和重传机制达到了比较理想的图像传输效果，能够满足大田环境下传输作物图像的质量要求。 |
| 英文摘要: |
| Crop image capturing and analyzing based of wireless image sensor networks can make full use of the characteristics of real-time and large-scale to obtain the status of crop and to improve the agriculture management. However, due to various interference factors, image usually can not been transmitted stably in the field environment. From the empirical observation, we know that packet errors are influenced by environment condition, FEC-ARQ mechanism is designed to transmit crop images in wireless image sensor networks. FEC-ARQ mechanism appropriate error-correction code according to the status of wireless channel. Sender node encodes message into codeword and sends codeword to receiver through wireless channel. Due to various interference factors, some packets cannot be corrected because there are more error bits in the packets and the error-correction code is not strong enough to correct the damaged packets. In order to ensure the crop image quality, FEC- ARQ mechanism will retransmit the packets when it cannot correct the damaged packets. Simulation shows that FEC- ARQ mechanism can efficiently transmit crop images in the field environment and ensure crop images. |
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