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There are several different features of satellites network compared to ground networks, such as long time delay, large bandwidth delay production (BDP), high error rate, intermittent and asymmetric links, etc. There are abundant research results indicated that it will reduce its performance and waste precious network resource if apply the traditional TCP in the satellites network directly. Transfer...
This paper gives a research of the cascaded digital decimation filter based on the 12.5kHz channel spacing standard of European ETSI's DMR which is designed to reduce the sampling rate with a large decimation. Because odd decimations can not be decomposed by 2, the application of HB filter is limited. The Anti-aliasing low-pass FIR decimation filter whose decimations are odd and high level can be...
It's the trend that sensor network become more standardized and unified as internet of things develops continuously. Aiming at resolving the problems arising from variety of sensors type and interface, this paper presents a design idea of a standardized sensor network node based on virtual instrument and IEEE 1451 standard, and expounds the realization of this sensor node. A concept of sensor node...
This paper presents a design method of three point temperature acquisition system based on Ethernet. and described the hardware and software design of system in detail. the hardware section mainly describes the principle and use of Ethernet controler DM9000A which is widely used in industry. The software part represents the structure and transplant of the open source TCP / IP protocol stack uIP 1...
The IEEE 1588 standard could synchronizes independent clocks running on separate nodes of a distributed measurement and control system to a high degree of accuracy and precision. But the standard did not present the method to implement the protocol in detail. An implementation of the IEEE 1588 based on an FPGA is presented in this paper. And the result of the experiment shows this method could achieve...
Zigbee wireless communication technology is a kind of newly arisen wireless network technology; the characteristic is short distance communication, low speed, low power dissipation, and low cost. It, application of Zigbee wireless communication technology, makes that inconvenient wire repeat can be avoided in the area of home, factory, hospital, etc. With the rapid development of IT industry and the...
According to the power industry DL/T645 protocol and the characteristics of the meter data transmission, a wireless sensor network of automatic meter reading communications network is proposed. According to statistical feature of DL/T645 protocol and requirement of meter data transmission quality, an IEEE802.15.4 QoS (quality of service) communication network, is presented in this paper.
According to the IM system's functional requirements, completed the overall design of IM system server, which has good function of communication and plug-in management. Propose the user login server optimized design, build a complete user login process, and design custom protocol packet structure. As well as design and implement the optimization methods of login server by using software. Finally,...
The rapid development of the grid and communication technology for raising the level of power management automation provides a strong condition. Traditional data replication system in rural power network has not keep up with the pace of modernization, the change the traditional and inefficient data replication system has become the goal of power enterprises. Aiming at the deficiency of FC-SAN technology...
The digital baseband part is the core of UHF RFID reader, its functions and features make direct impact on the reader's performance. So this paper presents the design and FPGA Verification of digital baseband system for UHF RFID reader based on ISO 18000–6b protocol. The digital baseband system consists of two parts: transmitter and receiver, which including frame header processing module, Manchester...
This paper introduces a distributed electronic monitoring system for the machine which is drilling the Sample of Deep-sea Core in deep ocean. The system composes of two components: monitoring and control computer on deck and underwater measurement and control system. Monitoring and control computer monitors and controls the underwater devices how to operator. Underwater measurement and control system...
Enhance Data Rate (EDR) in Bluetooth 2.0 specifications provide condition for Bluetooth multi-point communication. Aiming at application requirements of Bluetooth technique in wireless communication, Embedded Bluetooth Information Broadcast System (EBIBS) based on ARM9 microprocessor S3C2440 was designed and implemented. The system runs on ARM-Linux operation system and achieves single point transmission,...
GPS technique is widely adopted in many fields, it is particularly important to receive and handle GPS data rapidly and accurately using computer. In this paper, the GPS is introduced firstly; then the data format and the information components of GPS message are analyzed; finally, source codes in VB 6.0 language to process GPS data are given.
This paper implements a remote control method based on B/S model. That is to create a Web server — Boa in the ARM's hardware platform and to develop a CGI form processing program based on the Boa. Finally we achieve dynamic Web interactive function between the PC and the target Board.
With the development of embedded technology, embedded system in industrial control applications more and more widely, and the embedded Ethernet technology is particularly important, LwIP protocol stack, Ethernet in low-end embedded system applications may be provided, STM32 interconnected ARM processor and its official software for Embedded Ethernet application development offerred convenience condition...
As the growing popularity of wireless terminals remote access, the security of wireless remote access is getting increasing attention. It is an effective solution to establish a virtual private channel on the public Internet with the use of Secure Sockets Layer (SSL) to protect data security. The background is that we will establish and maintain a secure and trusted private SSL VPN tunnel based on...
Measuring and control system of coal mine rescue robot based on multi-sensor was studied. According to the special requirements of production in coal mine, distributed and modularized thought is used, and the system is divided into sensing and signal processing layer, decision control layer and execution control layer of movement. Each sensor is joined into the system as a separate module. The system...
SIP protocol is an important protocol for IP telephony in recent years. DoS (Denial of Service attack) is a common and difficult-defended attack. For the characteristics of SIP protocol, a variety of DOS-attack manners are introduced in this Paper, then specific prevention mechanisms are given to enhance the security of SIP network.
Object tracking is one of the most important applications of WSNs, especially for military usage. Sensor nodes should collect information about intruders and sound alarms to military in good time. Previous protocols suffer from flooding based method or focus on tree-based approaches. We proposed a quorum based protocol that is suitable for multi-sink and multi-object tracking applications. Simulation...
A novel network layer management protocol for the low-voltage power line communication (PLC) network is proposed, focusing on the dynamic network address assignment mechanism of the PLC network with a multi-master topology. The remarkable feature of the presented protocol is that it enables the equipments to claim, configure and maintain their network addresses autonomously within the PLC network...
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