Wireless sensor technology-paper代写

留学生paper代写精选范文：“Wireless sensor technology”，这篇论文讨论了无线传感技术。随着互联网技术的发展，如今人们的日常生活已经离不开网络了。而无线传感技术作为一种新的网络手段，在生活中的各个领域都有应用。和以前的网络模式不同，无线传感网络能较好地融合处理信息、网络通讯等技术，这也是目前信息科学领域当中新的探索方向。

With the deepening and development of technical research on wireless sensor networks in recent years, we can see that wireless sensor network technology can be divided into two different stages in terms of phased development: The first stage is faithful to the use of microelectronics technology to form a relatively small node equipment to be designed; the second phase is mainly for the sensor network itself, some of the problems and future development may be some of the issues to be concerned about and research.

In terms of the development of each stage, in view of the wireless sensor network system itself, the researchers must start from three angles to analyze, with a more comprehensive and adequate network management and network-related agreements and other technologies to understand the process to a comprehensive understanding of the network system. At the same time, with the current situation of the discovery of the sensor network and experts and scholars for the network support technology research situation, the main research points are mostly focused and time to keep pace, positioning two technical points. In addition, in the actual production and life, the wireless sensor network system for the practical application of the process of the situation, as a staff member, must complete the work is to correctly handle and properly manage the sensor equipment to collect information and data At the same time, in terms of storage and information data collation, because the wireless sensor network is a distributed database, so it is the form of data management and database management is basically the same.

In terms of practical application, the monitoring node needs to have the function of listening channel setting, listening data packet and forwarding data packet.

For example, the Telosb node IEEE802.15.4 protocol in the 2.4GHz band which will be set every 5Hz a channel, a total of 16 different channels, the use of 11 to 26 on behalf of the finger. To make the RF module work in channel K, set the node register FSCTRL.FREQ to FSCTRL.FREQ = 357 + 5 (k-11). Detection workers need to channel the value of the serial packet structure to be encapsulated, and then sent to the monitoring node. The monitoring node decapsulates the packet after receiving the packet, takes the channel value, and sets the channel at the same time.

CC2420 RF chip is in the default mode, only to receive the destination address for the current node (or broadcast) of the packet, and the need to set the receiving mode mixed mode. TinyOS 2.x provides the option to set the option CC2420-NO-ACKNOWLEDG EMENT in the Makefile configuration file so that the CC2420 can successfully accept the packets that it can accept. At the same time, set the option CC2420-NO-ADDRESS-RECOGNITION, the response packet is not sent; The TOSH-DATA-LENGTH option uses the setting for the maximum length of the received packet.

The packets captured by the monitoring node are encapsulated in the serial data packet. The packets received by the monitoring station will be extracted and analyzed according to the structure of the serial data packet. TinyOS 2.x serial communication using the active message mode, and serial data packets and HDLC are basically similar to the encoding, 0x7E for the delimiter, 0x7D for the escape character.

Most of the monitoring workstation software is developed using Visual C + +, in order to support the expansion of the agreement, the use of XML Schema standard protocol packet structure to define. For a new protocol or a user self-protocol, the user only needs to modify the part of the structure definition file to modify it effectively. The following is the ZigBee2007 protocol definition file among the Mac layer of a packet, as shown in Figure 1.

In the whole protocol, by the series layer, which each layer is composed of field field, the field length can be used to express the expression or numerical description. For example, the length of the DestPANID in the protocol file is determined by the value of the DestAddres sin gMode field in the current packet. The field reference uses @ as the beginning and is represented by the start hierarchy path string of the underlying layer. In the XML where the upperLayer node is the switch between the upper and lower layers, combined with the switchBegin and switchLength attribute values to the upper data area bit prefetch, and then combine the value of the upper XML node jump, continue to be resolved.

Because the actual environment which need to simultaneously send and receive data to monitor multi-node, so the resolution of the user experience has become an important factor in the impact. XML file resolution is relatively low, and the agreement file which contains a lot of formula, which contains the path in the path of the string reflected in the process, also in the process of parsing, there are often in accordance with the field level path string to get the specific value of the field Steps, if each time a data packet to be retrieved in accordance with the XML definition of each field to be resolved, will cause a great delay.

In order to effectively improve the efficiency of the resolution, the system can be pre-installed when the protocol file loading, the specific can be divided into the following two stages, namely, XML file analysis and preprocessing.

The XML file in each node (Layer, Field) are loaded into memory, and then transform the memory object, and then follow the XML definition to build the object hierarchy.

Allocate a protocol field number for each field, and a hash map between the field paths. For the same specific packet, the same path field value occurs only once, and there will be no ambiguity.

In the analysis of the data need to establish the agreement field number and packet field number mapping.

In the formula, the parameters are replaced with the corresponding fields using the corresponding field protocol, and are compiled into the inverse Polish type for the field attribute.

In general, wireless sensor as a new modern network technology means that it will win in the future of a wide range of practical application of space, but also can be deep into the human social life, to provide people with convenience. This trend has made a lot of relevant research institutions and universities have launched a targeted research and analysis. In the light of the current situation, there is no significant difference between our country and the developed countries. Therefore, this technology has very significant practical significance for national development.

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