Based on Beidou satellite communication platform, sliding force remote monitoring and warning system was widely used in Lingbao Luoshan gold ore, which had achieved remarkable social and economical benefits. However, ...Based on Beidou satellite communication platform, sliding force remote monitoring and warning system was widely used in Lingbao Luoshan gold ore, which had achieved remarkable social and economical benefits. However, there is one monitoring point at every 1 000 m2, and their distribution is so discrete that it will no doubt increase construction and operation cost if every monitoring point was installed a Beidou subscriber machine. Therefore, based on Zigbee wireless sensor network technology, network structure and the nodes, embed wireless sensor node in remote monitoring and warning system, a base platform of local wireless sensor network is formed, and it can combine punctiform monitoring information with planar network and transmit concentrated information through Beidou satellite terminal machine; as a result, this largely expands the transmission distance of monitoring data展开更多
基金Guangzhou Science and Technology Program(1563000115)
文摘智能视觉传感器技术因其低成本和图像高效采集优势成为当今无线视觉传感器网络(wireless vision sensor network,WVSN)的研究热点。该文在之前基于ARM平台S3C6410设计的低成本高分辨率农业视觉传感器(agricultural high resolution vision sensor,HRAVS)设计基础上,进行了网络和远程控制扩展,设计了一种基于WCDMA和Wi-Fi的高分辨率视觉传感器远程传输控制方案(vision sensor remote transmission control schema for the HRAVS,VSRTC)。使新型HRAVS节点可以利用有线、Wi-Fi、3G和4G等支持WVSN和农业物联网的应用。该文详细设计了VSRTC的应用体系结构、传输控制协议、应用软件。利用扩展的网络化视觉感知传感器,在华南农业农业大学试验农场部署了10个图像采集节点构成的WVSN,并开展了25d的运行测试,测试了新型节点的稳定性、图像采集与编码的性能,采集图像的平均耗时,以及在不同分辨率下的视频帧速率等。结果表明,该节点能够有效地支持命令响应式、周期响应式、视频流3种采集模式;在重传方案支持下所有节点指令丢失率在1%以内;在非联网状态下节点本地工作模式下,节点在1.3、2.0和3.2 Mpixel下采集图像的最短节点平均耗时分别约为6.2、8.2和11.1 s,最大视频帧速率分别为58.7、34.6、16.4帧/s;在全网络环境中,节点在1.3、2.0和3.2 Mpixel下采集图像的最短节点平均耗时分别约为17.6、26.9和49.6 s,最大视频帧速率分别为20.2、16.1、9.3帧/s。该方案对实时性要求不太高的农业领域来说,基本能满足其高分辨率图像和视频传输的需要。
文摘随着微处理器成本逐渐下降、现场仪表智能化程度逐渐上升,全数字化的、双向多变量的通信协议替代原有的4~20 mA模拟信号已成为发展趋势。介绍了可寻址远程传感器高速通道(HART)通信技术的特点及不断创新的应用。自开放式通信协议于1986年推出以来,不断对技术进行创新,除了继续增强4~20 mA的数字通信能力,更发展了WirelessHART、HART-互联网协议(IP)、HART-IP over Ethernet-高级物理层(APL)等全数字通信技术。目前,HART设备在全球安装数量超过4000万台。HART通信协议已成为全球智能仪表普遍使用的工业标准。
基金Supported by the National Natural Science Foundation （41040027）
文摘Based on Beidou satellite communication platform, sliding force remote monitoring and warning system was widely used in Lingbao Luoshan gold ore, which had achieved remarkable social and economical benefits. However, there is one monitoring point at every 1 000 m2, and their distribution is so discrete that it will no doubt increase construction and operation cost if every monitoring point was installed a Beidou subscriber machine. Therefore, based on Zigbee wireless sensor network technology, network structure and the nodes, embed wireless sensor node in remote monitoring and warning system, a base platform of local wireless sensor network is formed, and it can combine punctiform monitoring information with planar network and transmit concentrated information through Beidou satellite terminal machine; as a result, this largely expands the transmission distance of monitoring data
