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Since 2012, major technology giants have invested in the indoor positioning market. Such as Google's indoor map, Baidu provides indoor positioning services for shopping malls, Apple introduced iBeacon technology for indoor positioning, humans have 90 time indoors, public places, special environments, offices, except at home, indoor precise positioning must Will change people's lives, social, shopping, entertainment and other ways.
However, most of the existing indoor positioning technologies use wireless signal strength estimation distances such as Bluetooth and WiFi to achieve positioning. However, they all have the following drawbacks: First, you need to purchase, install, and configure many signal access points separately (such as Baidu indoor positioning using WiFi signal access points, and Apple ibeacon uses Bluetooth signal access points), which undoubtedly increases indoors. The cost and complexity of positioning technology. Second, due to the instability of wireless signal propagation, its intensity is constantly changing at the same position. It is difficult to estimate the accurate distance and improve the positioning accuracy. At present, the accuracy of indoor positioning is generally less than ten meters, that is to say, positioning can not be accurate indoors to a counter or a shelf, which greatly limits the application of indoor positioning.
A LED light on the top of the head has become a breakthrough in the bottleneck of indoor positioning technology. This technology, also known as visible light communication technology, uses a high-speed light and dark flickering signal that is invisible to the naked eye, such as a light-emitting diode, to transmit information.
First, give each room a unique address, compile this address into a modulated signal, and attach this signal to the driving current of the LED fixture by pulse width modulation, so that each LED light sends this address through the light when the user When this address is accepted, it can be associated with the location of the fixture to achieve positioning. Light travels in a straight line in the air, and the intensity is uniformly attenuated with the transmission distance. If a person to be positioned can be illuminated by a beam on the top of the head, then he must be under the beam, so the positioning accuracy can be within 1 meter.
Moreover, light sources exist in large quantities indoors, especially in parking lots and large commercial buildings. The lights in these places are open 24 hours, which provides a large amount of existing infrastructure for indoor positioning based on visible light, which greatly reduces the cost of foundation laying. Once the light source is laid, it will not change in a short time, which greatly reduces the maintenance cost of this technology for indoor positioning.
Technical advantages of the UBeacon system Based on this technology, Huace Optical Communication Technology Co., Ltd. has developed the UBeacon system, which is the most practical system in the world.
The UBeacon system includes LED light source, user mobile phone and mobile phone positioning and navigation application software. It first solves the hardware adaptation problem. The UBeacon system directly uses the user's smartphone as the optical signal receiving end, and the user only needs to install an application software on the mobile phone without adding any hardware.
From the perspective of cost, the existing expenditure of the visible indoor positioning system in the new cost is mainly the investment of hardware facilities. Since the UBeacon system does not have too much hardware requirements, the only hardware cost is only a set of modulation modules installed in the LED lights, and there is no need for communication between the LED lamps, which can be laid according to ordinary lamps without increasing the installation cost.
Of course, compared with other existing indoor positioning technologies, the UBeacon system has the advantage of positioning accuracy of 1 meter, and is not affected by any environment, let alone it has the characteristics of fast positioning speed and good positioning effect.
At the purely technical level, the UBeacon system changes not only the lighting, but also the revolution in the history of indoor positioning technology.
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