Design of Wireless Security System Based on ZigBee Communication Network

The traditional security system collects corresponding information in the terminal and uploads it to the monitoring center mode by wired communication, which may lead to limitations such as cumbersome wiring, inability to achieve full coverage of the terminal device, and inability to share information. In this paper, a wireless security platform based on ZigBee communication network is designed. The platform builds a stable communication network in the monitoring area through ZigBee, enabling each subsystem to collect corresponding data information in the network environment and upload it to the monitoring center through the ZigBee wireless communication network, achieving information sharing. Intelligent and efficient.
With the advancement of technology, people have put forward new requirements for security systems, such as intelligence, cost-effective and information sharing. The security systems currently in use are usually characterized by strong targeting, but this status quo leads to the inability to share information between systems and to maximize performance. Based on this situation, the paper proposes to establish a powerful wireless communication network system based on ZigBee in the monitoring area. The system integrates a variety of security measures to achieve information sharing between systems to meet specific security requirements.
1 ZigBee technology overview The limitations of wired networks in the communication process have spawned the idea of ​​wireless network communication systems. After decades of development, wireless network communication technology has been relatively complete. Wireless networks are mainly divided into WWAN (Wireless Wide Area Network), WLAN (Wireless Local Area Network) and WPAN (Wireless Personal Area Network). ZigBee is based on the IEEE 802.15.4 standard, which has the advantages of low power consumption, low cost and close proximity. It is mainly used in the fields of intelligent home systems, industrial control, medical places and agricultural automation involving automatic control and remote control. Low-Rate Wireless Perosonal Area Network (LR-WPAN).
2 System overall design scheme The wireless security system researched and designed in this paper combines a variety of advanced wireless technologies, including not only ZigBee wireless technology, but also GPS positioning technology and ANT wireless technology to form a wireless network system platform. In this paper, the functions of the three subsystems in the system are taken as an example, that is, the three objectives of personnel positioning, item management and vehicle tracking are realized.
As shown in FIG. 1, the system mainly includes terminal information collection, data processing module, wireless communication module, and user terminal. The information collected by the terminal device is uploaded to the data processing module through the wireless communication module, that is, the ZigBee wireless communication network; the data processing module analyzes and processes the data from the ZigBee wireless network and stores the data in the database; the user terminal can log in to the location server to request the interested The data processing module provides the query software to display the data requested by the user terminal. The operator monitors each terminal according to the monitoring software display data and handles the emergency.

2.1 System hardware design Through the research and analysis of the above system composition framework, the underlying hardware platform of the system is designed. It can be seen from the above analysis that the terminal device is responsible for uploading the collected related information to the nearest routing node in the ZigBee communication network, and the node is responsible for transmitting the data to the ZigBee coordinator via the communication network, and the coordinator uploads the data to the data processing module. . Therefore, the high-performance networking and communication of the ZigBee wireless network is the key to the design of the system. Considering that the ZigBee communication part is basically used in all parts of the system, the ZigBee communication part is modularized, which is beneficial to simplify the construction process of the subsystem platform. Figure 2 shows the block diagram of the ZigBee communication module.

As can be seen from FIG. 2, the ZigBee communication module mainly includes six sub-modules. The microprocessor adopts 16-bit high-performance single-chip microcomputer. Considering that the communication module must install the ZigBee protocol stack, the microprocessor should have its own programmable flash memory. In the system design process, TI's MSP430F2112 is selected as the core MCU. Modules are common devices. The ZigBee communication module mainly includes two parts: a ZigBee routing node and a ZigBee coordinator. At present, mainstream wireless communication network solutions usually have two methods: RF+MCU and single-chip integrated SOC. The RF+MCU model mainly includes the CC2420 and MSP430, which is the first RF IC to meet the requirements of 2.4 GHz ZigBee products introduced by TI. It is mainly used to develop low-power wireless networks such as smart home systems, building automation systems, and industrial Monitoring system and wireless sensor network, etc.; and MC1319x and GT60 combination is a wireless networking module based on IEEE802.15.4 protocol in the 2.4 GHz band, which is developed by Freescale. Its advantages are short distance and low power consumption; The integrated SOC solution mainly includes TI's CC2530 and Freesclae's MC1321x. Using TI's single-chip integrated SOC solution, the chip CC2530 is used as the main chip of the ZigBee communication module of this system. The CC2530 uses a standard 8051 processor. The specially designed processor core not only has low power consumption, high speed, low noise, but also does not affect the high frequency communication due to the high speed operation of the 8051 core. At the same time, it can also directly transplant TI's Z-Stack protocol stack to save costs and shorten the development cycle for users; the most important point is that CC2530 can also increase the transmission intensity and distance of data by plugging a power amplifier chip CC2591. It is suitable for occasions where there are many obstacles and the communication environment is complicated.

2.2 Software Design All data transmission in the system is realized through the ZigBee communication network. Therefore, it is an important task to design a stable and reliable ZigBee communication network. Considering the complexity of some software designs, the ZigBee scheme of CC2530 is selected. The manufacturer of CC2530, TI, provides a complete ZigBee protocol stack Z-STACK, which can be considered as a software package, which integrates the routing algorithm of ZigBee networking, data forwarding mode and functional package of each core chip. It is an open version, and developers can modify the corresponding feature package according to actual needs. This not only saves developers time, reduces development difficulty and intensity, but also has an efficient ZigBee self-organizing network capability, enabling routing and data forwarding to be completed automatically, enabling high-quality ZigBee communication to be guaranteed. The formation of the ZigBee mesh network is done by a ZigBee coordinator, so the first step in networking is the establishment of the ZigBee coordinator. Since any full-featured node can assume the role of a coordinator, after each node is powered on, it will determine its own coordinator according to the routing algorithm, and the coordinator will determine a network ID through search filtering, and then use this network. The ID establishes the network, but this automatic networking method has a large randomness, especially the choice of the coordinator will be uncertain. In practical applications, the coordinator may also have some special functions. For example, in this design, in addition to being responsible for establishing the network, the coordinator is responsible for collecting all the data and packaging the data to the data processing module through the network port; Some instructions issued by the location server are also sent to the functional nodes through the location coordinator, so the hardware design of the coordinator will be different from other routing nodes. Therefore, in this design, the coordinator is manually designated and assigned a network ID, and the coordinator constructs a ZigBee mesh network by using the network ID, and the forming process is as shown in FIG. 4 .

3 System testing According to the above-mentioned wireless security system organization structure, technical implementation means and the design of the underlying circuit and software. From the perspective of the application layer, combined with the example of the wireless security system, the paper mainly tests the application value of the system from the aspect of item management.
Item management is mainly for the management of some valuable or dangerous goods. The system will automatically assign a safe area to these items. If you don't apply, these items can't leave this area casually, or the system will receive an alarm. During the test, when the item is moved, the vibration sensor will give a start signal, communicate with the data processing module through the ZigBee network, and compare with the set safety displacement. If the moving position is within the safe displacement, The alarm signal is not sent, and the comparison process will continue; when it is detected that the moving distance of the item exceeds the preset safety displacement, the alarm signal is transmitted to the data processing center through the wireless network, and the monitoring personnel display according to the user terminal management system. Relevant alarm information for emergency handling and operation.
FIG. 5 is an alarm message when the user terminal simulates that a valuable item is illegally moved under the item management subsystem interface. Click on the "Article Management" button to enter the subsystem interface.

4 Conclusion Through the analysis of the current status of security field, this paper identifies the application of wireless communication technology in the security field. The application of wireless communication technology can greatly reduce the engineering wiring of traditional security systems and reduce the construction cost. At the same time, the wireless security system can improve the intelligence and digitization of the system, improve work efficiency and security performance, and reduce security corners. Do real security protection. Since the security system's service target is usually a specific group, the security system belonging to a specific object can be created according to the distribution characteristics of the group members themselves, which will be beneficial to the further development of the wireless security system.

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