For the 3C products sold in many shopping malls on the market (such as mobile phones, tablets, computers, etc.), merchants will show prototypes to customers. In order to prevent loss, an electronic anti-theft cord will be pasted on the back of the prototype because the cable length is limited and the range of movement is limited. , There is no way to demonstrate the functionality of the mobile phone in many ways, resulting in a bad user experience in purchasing the phone, and a false alarm occurred for a long time.
In order to optimize the user experience, based on customer needs, we launched a wireless 3C store display anti-lost alarm solution based on UWB technology and UWB ranging module, bid farewell to the limitation of the anti-theft line's range of activities, more space, and more angle improvements User purchase experience.
The 3C store display machine anti-lost alarm solution is mainly composed of the following hardware:
As shown in the figure below, there is a UWB module on the product side (such as a mobile phone) and the base side, and the host device on the base side is fixedly installed, and its UWB module is bound to the UWB module inside the label on the mobile phone one-to-one, and set Good early warning distance and alarm distance, if the distance exceeds the set distance, it will alarm. The background server will record data in real time. When the alarm mechanism is accidentally touched, the alarm state can be released by the remote control.
This solution is essentially an application of high-precision UWB ranging, and the TWR ranging algorithm adopted is shown in the following figure:
Ranging formula: distance between UWB modules = TOF (signal time of flight) * speed of light.
Through the UWB signal flying time between the two UWB modules, the TWR ranging algorithm is used to calculate the distance between the product and the base. If it exceeds the set distance, an early warning and alarm message will be generated. Since the TWR algorithm uses UWB signal flight time to calculate the distance, the accuracy can reach less than 0.5 meters. Compared with Bluetooth technology, the accuracy of calculating the distance (3-5 meters) through RSSI (received signal strength) technology is greatly improved.
In addition, the Bluetooth module on the base side can send the calculated distance to the back-end server, and the back-end server can judge the number of times the product has been picked up based on the distance between the product and the base, and the time of each product experience to analyze the customer The degree of interest in different products.
Hardware aspect: The size of the label device on the product side is only 162714 (mm), sticking to the mobile phone will not affect the experience, and the host device on the base side can be customized according to the actual needs of customers;
Software: The data communication format, protocol and sound and light control with the back-end server can be defined according to customer needs.
UWB modules can be used in small-range, high-resolution radar and imaging systems capable of penetrating walls, ground, and bodies. Such as military, public security, fire, medical, rescue, surveying, exploration and scientific research and other fields, used for precise ranging and positioning.
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