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1. Requirements and analysis
1.1. Requirements description
Item safety is a problem that we often face in our daily work. From the manufacture of items, the transportation of items to the storage management of items, all involve safety issues. The scenarios and requirements are more complicated, and all-weather supervision must be done in time and space. Based on the above requirements, we use active RFID technology to achieve effective identification of a large number of tags within a medium and long distance range, so as to collect the status of supervised items in real time and achieve unified security management. According to the application experience of SUPERRFID, the typical requirements (Demand) are as follows:
*Item area safety management, regarded as safe in the control area, once it leaves the control area, an alarm will be issued;
*Illegal movement of items will be reported immediately;
*Safety supervision during the logistics of goods (refer to the safety technical plan of Xiupai logistics transportation, this plan does not explain).
1.2. Demand analysis
According to the above requirements, we need to face the following problems:
*Existence
Items are considered safe in the control area. This state needs to be maintained, and certain judgment methods need to be adopted to reflect the existence of items. This is the core of safety supervision.
*Mobility
The mobility mentioned here refers to the item being moved. There are two situations. One is that the item can move freely in the authorized area, but it must not be moved to the unauthorized area, otherwise the alarm will be reported. The other is that items must not be moved without authorization, even if they are within the supervision area, the alarm is triggered when they move.
2. Design principles
According to the core requirements, the entire program is designed and planned in accordance with the following principles:
2.1 Stability
In order to ensure system stability indicators, mature, stable, and advanced technologies are used in the entire program design to achieve requirements. Reliable innovation is carried out on the basis of mature technology, so that the entire system can operate reliably and has innovative features. The 2.45GHz radio frequency identification technology used in the system, directional antenna area control and distance control technology, data transmission technology, sound and light alarm, video linkage, etc. are relatively more widely used and relatively mature technologies.
2.2 Real-time
The rapid realization of signal recognition, acquisition, processing, and decision-making of the entire system is very important, which requires the design of software and hardware to fully consider these. It is necessary to make full use of the characteristics of 2.4G high speed, large range, large capacity, and good anti-collision performance for design.
2.3. Accuracy
The controlled area should be clearly demarcated to prevent misjudgment and false alarms.
2.4. Security
2.45GHz wireless radio frequency communication and data transmission process adopt safe encryption algorithm to ensure data security. At the same time, the system has a high real-time alarm response speed, which ensures timely warning and safety prompts. It is also necessary to consider implementability and safety in the design of system operation specifications.
2.5. Economy
The entire system structure must have a higher cost performance, try to share resources, and lower maintenance costs.
3. Technical solution
3.1 System goals
The technical solution needs to achieve the following goals:
*2.4G signal coverage is stable in the article supervision area;
* The definition of the authorized area within the article supervision area;
* Reliable identification;
*The system early warning speed is fast.
4. System architecture diagram
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