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1. Project background
In the elderly living apartments with general market demand, in order to fully take into account the living characteristics of the elderly, barrier-free design is adopted. The indoor activity areas such as the elderly’s rooms and bathrooms are equipped with intelligent monitoring systems such as emergency calls and infrared monitors. However, because these devices are installed in a wired manner, it is very inconvenient for some elderly people with limited mobility to use, and when the elderly are outdoors, these traditional devices are completely powerless. It is impossible for the community to provide a service person for every elderly person. It is frequently seen that the elderly are not in a timely manner when they encounter dangerous situations. Therefore, the network-based wireless positioning technology can realize the real-time positioning and help-seeking function of the whole area in the elderly living apartment. The safety monitoring and rescue problems of the elderly during outdoor activities have been well resolved, and since each elderly person carries a mobile tag with him, he can press the help button in time when encountering danger, which is simple and convenient to use and reliable. high.
2. Project requirements
Because it is related to the life and health of the elderly, it is generally necessary to consider video surveillance of important venues in the elderly community, strict attendance of management personnel to prevent accidents due to human factors, real-time detection of the activity status of the elderly, and the emergence of dangerous situations as soon as possible Alarm, management personnel must realize barrier-free calls in the area. In addition, in order to facilitate the elderly to carry, the elderly have to rely on a card for dining, entry and exit, and consumption. With the development of home care equipment, medical staff can carry convenient nursing equipment to measure the health of the elderly on the spot, and can use a portable tablet The computer retrieves the historical indicators of the elderly through the wifi wireless network, and the newly measured indicators can also be wirelessly transmitted back to the system in real time to save new records. In short, the care for the elderly must be safe, reliable, real-time, and accurate.
3. Jumei Internet of Things Solution
In so many applications, a network with high bandwidth, long transmission distance, strong penetrating power, and convenient networking is required. Based on this, Jumei Internet of Things proposed a complete set of solutions based on WIFI wireless coverage.
3.1 Wireless positioning system
3.1.1 Composition of wireless positioning system
3.1.1 Principle of joymake wireless positioning system
The system mainly uses the method of field strength measurement, that is, the electronic tag will scan the wireless AP signals deployed in the area at a set interval, and the obtained field strength value will be forwarded to the positioning engine through the wireless AP, and the positioning engine will be based on the pre-established The mathematical model displays the calculated results on the EASYView management software
3.1.2 System function
Consumption: The IC card function is integrated in the electronic tag. When consumption is required, the card needs to be swiped close to the reader to complete the transaction record.
Door opening: Combining with the access control system, you can use a card to complete the door opening/closing function.
Positioning: You can know the location of the member’s area at any time.
Prevention of loss: when a mentally handicapped or special person approaches the nursing gate, it is recognized by the wireless access control system and a joint alarm device sends out a reminder.
Movement control: remind staff when members leave restricted areas or enter unauthorized areas.
Detention alert: The system reminds the staff to check in time to prevent accidental emergencies when members detained in a certain area for too long.
Bed leaving alarm: In the evening, when a member leaves the bed for a long time, the system will automatically prompt a certain bed in a certain room to leave the bed to remind the nursing staff.
Emergency call: The terminal product can expand the emergency call button, and members can initiate emergency calls with their portable terminals.
Information fusion: The system database can be integrated with basic member information and medical equipment sensor data.
3.1.3 System advantages
Comparison of JOYMAKE Wi-Fi RTLS technology and RFID technology
Comparison of Wi-Fi wireless positioning technology and active RFID technology
Network scalability: dedicated network without scalability, no international standard support, private protocol, independent and incompatible RFID networks of different manufacturers, easy to cause network duplication to build powerful extension functions, Wi-Fi network can easily realize voice , Video, positioning, wireless sensing and other functions. The network has strong compatibility, and can use the already laid Wi-Fi network to avoid repeated construction of the network.
Network popularity: the scope of application is small, and the popularity is not high. Wi-Fi network deployment requires professionals. Wi-Fi networks are widely used and cover more and more areas. The technical requirements for network deployment are not high, and there are mature international standards to ensure .
Network manageability: The network centralized management ability is weak and powerful equipment network management function.
Construction is difficult and easy: Ordinary RFID readers need to be interconnected through dedicated data lines. When precise positioning is achieved, each positioning point must be equipped with a reader, which causes wiring troubles and increases labor costs. There is no precedent for using RFID technology to achieve precise positioning. The positioning APs are interconnected wirelessly without wiring, which greatly reduces the cost of labor and wiring, and the construction is simple and convenient.
Network security: RFID does not have a unified international standard, and there is no unified standard security authentication mechanism, and there is no unified standard for security encryption of transmission data. In most cases, it is not encrypted. Even if it is encrypted, the format is determined by the manufacturer itself, and the reliability is poor. . The risk of being cracked is greater.
1. Support WEP, WPA, WPA2 and other international standard encryption methods. 2. When the wireless positioning system turns off the AP broadcast mode, laptops or other Wi-Fi terminals cannot search for the AP’s SSID, but the tag can still be located.
3. The label supports digital encryption technology.
4. The internal and external networks are isolated and interconnected through two servers. One of the two servers can be used for location information collection, and the other can be used for location monitoring report printing and analysis. The two servers are connected through a serial port to prevent the intrusion of the external network into the internal network.
Transmission rate: dozens of Kbps, fast transmission speed, up to 1Mbps～54Mbps.
Network coverage and cost: Achieving seamless coverage requires high costs to achieve seamless indoor and outdoor coverage at low cost.
Terminal types: In addition to RFID tags, other wireless terminals cannot be positioned. Except for Wi-Fi tags, it can be positioned on any terminal with Wi-Fi function (PDA, Wi-Fi mobile phone, etc.).
Label scalability: limited by bandwidth, the scalability of the label is not high, and it can be connected to video, voice, and sensors to achieve two-way data transmission.
Other functions: The use of terminal equipment to scan requires an external reader card. It can also support Wi-Fi terminals (PDAs, notebooks, Wi-Fi mobile phones, etc.) to scan and identify tags when there is no network.
Positioning accuracy: The accuracy depends entirely on the distribution of readers. To achieve high precision, readers must be densely distributed. In view of the cost of readers, the cost of precise positioning is also very high. Generally, only regional Wis with independent intellectual property rights can be located. -Fi positioning algorithm, the accuracy can reach 3M ~ 5M.
Software: General RFID systems do not have professional precise positioning algorithms and multiple management functions. Powerful software management functions based on precise positioning, support Chinese interface, label management, AP signal management, real-time positioning, area alarm, real-time alarm, historical track analysis And many functions such as playback, disappear alarm, etc., support remote WEB real-time monitoring.
3.1.4 Features of joymake positioning system
1. Using the advantage of high bandwidth, the system can be used in conjunction with various sensors to upload the collected information to the server
2. The joymake positioning system completely uses the TCP/IP protocol, which is equivalent to a laptop and can support any ordinary wireless router.
3. The joymake positioning system does not need to add wireless routers or trigger devices in the room to accurately locate and determine. This is because the joymake system does not locate tags near wireless routers like other systems, but relies on powerful engine algorithms to complete.
4. Since it is not located near the wireless router, JOYMAKE does not need to increase the number of wireless routers when higher positioning accuracy is required.
3.2 Video surveillance
Due to the deployment of the wireless network, we can save the trouble of wiring, just set up wireless cameras at monitoring points such as concentrated activity areas, entrances and exits, and financial offices.
3.3.Voice intercom
At present, more and more units on the market have used wifi as the intercom function. Because of its long transmission distance, the quality of the speech is clear, and the camera function can be used to quickly transmit the signal back to the control center. The staff use WIFI walkie-talkie to realize free internal communication, and can send back the captured video in time.
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