外文翻譯--采煤工作面無線傳感器網(wǎng)絡物理層設計uwb技術-展示頁
2024-08-26 12:27本頁面
【正文】 f the mining Coal face is shown in Figure 1. In this Figure, the sensor nodes send the information of acquistion through one or more jumps to the cluster node, the base station (sink node) is responsible for the collection of data, and transmit them to task management node through upslot network, task management Node is responsible for the integrated process the data and also issued instruction to sensor networks. The tunnel of coal face is a limited space. Bracket, shearer, transport and other large metal equipments are layout and coal, rocks and other media is a nonuniform restricted space, which all make the transmission channel more plex, fading and multipath phenomena more serious in the transmission of wireless sensor nodes signal. These are different from sensor networks on the ground. Therefore, the design of transceiver node of it is particularly important. At present, there are three main technologies of the physical layer in wireless sensor networks: narrowband modulation technology, spread spectrum technology and ultrawideband (UWB) technology. While UWB technology possesses some attractive advantages such as low power spectrum density, lowplexity system, Low sensitivity to the channel fading, better security and so on. Considering the advantages and the characteristics of coal face naturally, we have adopted Impulse radio ultrawide band (IRUWB) technology, and the reasons are followed: 1) UWB technology consumes lower power and has lower power spectrum. Low power consumption, lowcost and small size are the most important feature of wireless sensor network nodes. Narrowband modulation technology, spread spectrum modulation technology generally use sine carrier , IF and RF circuits exist in the systems, so consuming more power than the UWB technology with no carrier. Transmission medium in the coal face is nonuniform, which leading to more transmission loss than wireless munications systems on the ground. Therefore low power consumption bees particularly important. In the coal face, as WSN node presents zonal distribution, nodes just need to municate with neighbornodes. The WSN system based on UWB, consuming lower transmission power, can meet the requirements and avoid the interference with each other in the narrowband munications node. In addition, the low power consumption and high penetrating power help to design safe equipment and transmit disaster relief signal. 2) Strong antiinterference ability. In the coal face, electrical and mechanical equipment has narrow distribution. When equipment starts or stop, electrical sparkle may cause a lot of electromagnetic interference. So good antiinterference capability is strongly required in the wireless munication. 3) Good Antiinterference to multipath ability. Coal face has some inherent characters, such as narrow space, more types of media, a multipath intensive channel, while IRUWB can be applied to this plicated environment with its advantages: narrow Pulse width, small pulse duration ratio, high multipath resolution, strong antimultipath and fading Capacity. 4) Simple structure. The characters of IRUWB, such as no modulation and up/down conversing frequency, simple transmitter structure, lower power consumption, make it more acceptable. According to the plexity of the node and power consumption into considerations, IRUWB technology is very applicable to the design of the wireless sensor network physical layer. Therefore, pared to narrowband modulation technology, spread spectrum technology, the wireless munication system based on the UWB technology present a good performance on the energy consumption, robustness, antimultipath and antinoise, and so on.
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