Bluetooth personnel positioning

weiyuliang2006

Bluetooth personnel positioning [Copy link]

 

Hello everyone, are there any friends who use Bluetooth chips such as CC2652R to develop applications such as positioning or item tracking?

chunyang

To get direct help, ask specific questions.

weiyuliang2006

chunyang posted on 2020-6-29 21:37 If you want direct help, your questions should be more specific.

Thank you chunyang . I am now planning to use CC2652R to develop an indoor personnel positioning system, which is divided into beacons, personnel cards, and gateways. I wonder if it is feasible?

huo_hu

How does Bluetooth positioning work? Do you have any idea about the principle?

chunyang

weiyuliang2006 Published on 2020-6-30 08:17 Thank you chunyang, I am now preparing to use CC2652R to develop a personnel indoor positioning system, which is divided into beacons, personnel cards, and gateways. I don’t know if it can be...

In theory, of course it is possible, but whether it is practical depends on the design.

chunyang

huo_hu posted on 2020-6-30 18:18 How does Bluetooth positioning work? Do you have any idea about the principle?

Simply put, it is to use field strength to do triangular positioning. For a specific positioning node, the signal strength sent by the positioning node received by the receiver, that is, the terminal to be positioned, is related to the distance, that is, the distance from the positioning node is roughly known. If there are at least two positioning nodes, the distance between the terminal and the two nodes is known respectively, and the position of the positioning node is known, so the position of the terminal can be calculated using trigonometric functions. Although there are two solutions in theory, as long as the terminal moves and performs at least two calculations, it may be possible to obtain a unique solution (with a high probability of being valid, only special trajectories are invalid). If there are three positioning nodes, then the solution is unique.

huo_hu

chunyang posted on 2020-7-1 16:26 Simply put, it is to use the field strength to do triangular positioning. For a specific positioning node, the receiver, that is, the terminal to be positioned, receives the signal sent by the positioning node...

Draw a circle with three points, but it won’t work if they are too close or too far.

chunyang

huo_hu posted on 2020-7-1 18:31 Draw a circle with three points, but it won’t work if they are too close or too far.

Distance is related to transmission power and receiving sensitivity. The transmission power of Bluetooth and other devices is very small. Considering the positioning accuracy, such solutions require the deployment of many positioning nodes. It is no problem if it is too close, but the signal saturation will increase the error. If it is too far, no signal will be received, and positioning is naturally impossible. Mobile communication base stations can also use this principle for positioning, but the distance is much longer. This positioning principle has been used for hundreds of years.

weiyuliang2006

chunyang posted on 2020-7-1 23:52 The distance is related to the transmission power and receiving sensitivity, and the transmission power of Bluetooth and the like is very small. Considering the positioning accuracy, this type of solution requires the deployment of a lot of positioning...

Thanks to chunyang , it is indeed a similar principle, plus the filtering algorithm, taking advantage of the low power consumption and short distance characteristics of Bluetooth

chunyang

weiyuliang2006 posted on 2020-7-7 17:31 Thanks to chunyang, it is indeed a similar principle, plus the filtering algorithm, taking advantage of the low power consumption and short distance characteristics of Bluetooth

This type of positioning is still difficult to implement in practice. Multipath transmission is a major factor affecting accuracy, and attention must also be paid to antenna design.

weiyuliang2006

chunyang posted on 2020-7-7 17:40 This type of positioning is still difficult to make practical. Transmission multipath is a major factor affecting accuracy. In addition, attention should be paid to antenna design.

Received, thank you, it is indeed the case, there is no problem in principle, but there are many factors affecting the actual test, so it is difficult to achieve stability and accuracy

星网云联

The StarNet Cloud Union Fusion Positioning System adopts the self-developed knowledge transfer algorithm to achieve high-precision positioning under the framework of multi-technology integration. It has UWB positioning/Bluetooth positioning/WiFi transmission and other technologies, taking into account the characteristics of high precision, low cost, and easy deployment. Based on high-precision positioning, it launches two-dimensional/three-dimensional vector maps and various IoT visualization interfaces, which can meet various location-based services and applications, and can also provide terminal users with diversified application functions, such as trajectory tracking/dynamic electronic fences/virtual patrols, etc.

At present, the integrated positioning system has been successfully applied in industries such as petrochemical, tunnel safety, electric power and energy, and mining safety. It has successfully achieved the system deployment and normal operation and maintenance of 3,000+ base stations and 20,000+ tags in a single project, and can provide users with reliable software and hardware positioning products and applications.