1. What is Bluetooth communication technology?
Bluetooth technology can be seen everywhere around us. The Bluetooth speakers, mice, headsets, homes, door locks, mobile phones and PCs that we usually buy are all scientific and technological achievements brought by Bluetooth technology. Bluetooth can be said to be the same as ours. Daily work and life are closely related. And when we are enjoying the convenience brought by Bluetooth technology, it is inevitable that we will go back and delve into some questions, such as: Why invented Bluetooth communication technology? Why is it called "Bluetooth"?
Origin of
Bluetooth : The founder of Bluetooth is Ericsson of Sweden, and this company has been developing Bluetooth technology as early as 1994. By 1997, Ericsson had contacted other equipment manufacturers and aroused their strong interest in the technology. By February 1998, five multinational companies including Ericsson, Nokia, IBM, Toshiba and Intel formed a special interest group (SIG). Their common goal is to establish a global small-scale wireless communication technology, which is now Bluetooth technology .
The origin of the name of
Bluetooth : The name of Bluetooth comes from the 10th century Danish king Harald Blatand-English translated as Harold Bluetooth, this Danish king likes to eat blue plum, so his teeth are stained blue every day. At the beginning, Bluetooth technology was in the preparatory stage of the industry association, and a very expressive name was needed to name this high-tech. After a night of discussions about European history and future technology development, some people thought that it was used by the Danish King Blatand. The name couldn’t be more appropriate. Because King Blatand unified the present Norway, Sweden and Denmark; he is articulate and sociable, just like this upcoming technology, and this technology will be defined as allowing coordinated work between different industrial fields. Maintain good communication between various system areas . For example, the work between the computer, mobile phone and automobile industries, so the name is fixed.
Bluetooth technology has been updated many times since its birth in 1998, from audio transmission, image and text transmission, video transmission, to data transmission of the Internet of Things with low power consumption. On the one hand, the downward compatibility of Bluetooth devices is maintained, and on the other hand, Bluetooth is also being used in more and more IoT devices. With the emergence of Bluetooth 5 technology and the maturity of Bluetooth mesh technology, the barriers to long-distance and multi-device communication between devices have been greatly reduced, bringing greater imagination to the development of the Internet of Things in the future. The technology that came out a year ago will continue to glow with vigorous vitality in the future.
2. What is AOA? What impact can AOA positioning technology bring?
What is AOA positioning technology?
Before talking about AOA positioning technology, let’s briefly understand indoor positioning technology . Indoor positioning technology is a very hot black technology that has been fired up, and it is also a hot spot for capital pursuit in recent years. At present, the mainstream technical solutions for indoor positioning on the market include: UWB positioning, WiFi positioning, infrared positioning, visual positioning, lidar positioning, and Bluetooth RSSI positioning. In recent years, there have been many companies in the market claiming that they can achieve centimeter-level and sub-meter-level precision positioning, but the products of these companies often have many problems, or the cost is too high to achieve large-scale commercial use. Until January 2019, the Bluetooth Technology Alliance introduced a new technology in the Bluetooth 5.1 technical specification: Bluetooth AoA positioning technology.
The full English name of AOA technology is Angle Of Arrival , which translates to " Angle Of Arrival Technology". It is a two-base station positioning method that detects the direction of arrival of the transmitting node signal through some hardware devices such as antenna arrays, and calculates the location and perception The relative orientation or angle between the devices, and then use triangulation to calculate the position of the node .
As shown in the figure below, assume that the coordinates of the unknown node N are (x, y), and the coordinates of the two base stations A(x1,y1) and B(x2,y2) are known. At this time, if you know the connection between base station A and device N The angle α with the reference direction can be used to draw a ray; similarly, another ray can be drawn by knowing the angle β between the connection line between the base station B and the equipment and the reference direction. Then the intersection of the two rays is the position of device N. This is the basic principle of AOA positioning technology, which is also called triangulation .
The triangulation method is expressed in the following formula:
What impact can AOA positioning technology bring?
Compared with the well-known UWB technology at the time, Bluetooth AOA technology not only has the advantages of sub-meter high-precision positioning, but also has the technical characteristics of flexibility, high concurrency, low cost, low power consumption, and high compatibility. Effectively solve the high cost problem caused by large-scale positioning label applications such as people, vehicles, objects, and materials in the smart industry. At the same time, Bluetooth, as a standard configuration of smart terminals such as mobile phones, provides an excellent technical port for achieving rapid penetration of indoor high-precision positioning, and promotes large-scale indoor positioning applications in public service areas such as smart supermarkets, transportation hubs, museums, exhibition centers, and hospitals. Ecological formation.
At the same time, Bluetooth AOA, as a universal positioning service, coincides with the east wind of my country's new infrastructure construction, through "5G + Bluetooth AOA two networks in one", "Smart light pole + Bluetooth AOA location service", "Bluetooth AOA field Construction methods such as "internal location services" not only substantially amortize infrastructure construction costs, but also enable 5G technology applications. At the same time, accurate spatial information can be used to penetrate more scenes of smart cities such as tunnels, underground parking lots, and overpasses, so as to boost the development of smart parking and autonomous driving. In short, the new positioning technology of AOA may expand another strong landing scenario for Bluetooth, a wireless protocol with great commercial success in the future.
To learn more about the past and present of Bluetooth, please click on the link below:
Past and Present of Bluetooth Technology