Implementation of Bluetooth AOA fusion Bluetooth beacon positioning system
Based on the Bluetooth 5.1 arrival angle technology, so that the use of radio frequency Class Bluetooth for the first time can do the accuracy of tens of centimeters of positioning system, of course, this accuracy is the laboratory theoretical value, the actual use is often due to interference and multi-path effect can not achieve this effect, but the accuracy can still be maintained at about 1 meter, and a meter of accuracy of the indoor positioning system can be called a high-precision positioning system.
However, due to the limitation of the reach angle, the actual application of finger conditions is too much, such as the need to deploy a Bluetooth AOA positioning base station in a very short range, which will bring great challenges to the implementation and cost, but also make the user have great concerns about choosing this technology as a positioning system, based on this reason, Benlu positioning on the basis of bluetooth AOA positioning system, the integration of Bluetooth beacon positioning technology.
For beacons, many people first know that it was at Apple's conference, Apple once launched IBERACON, this technology is simply to use signal strength to vaguely calculate the location of the object from the beacon. Standard Bluetooth provides three states: far, middle, and near, corresponding to a distance of 1 meter, 5 meters, and 10 meters, respectively. However, because the signal strength is extremely susceptible to interference, the effect is still unsatisfactory despite only three states.
But Bluetooth beacon positioning can achieve an effect, that is, to know the positioning tag is about the location of the beacon. Therefore, we combine Bluetooth AOA high-precision positioning base stations to lay base stations in areas where high-precision positioning is required, and Bluetooth beacons are laid in areas where high-precision positioning is not required.
Of course, in order to achieve this function, we must expand the high-precision positioning base station, that is, the broadcast that can receive the positioning tag, but for this module, people who understand the Positioning Fuzzy Positioning and Area Positioning System should be very clear that we have done enough technical accumulation in this field, so the problem is not big.
In summary, we perfectly blended the two technologies of angle of arrival (AOA) and signal strength (RSSI) to truly achieve a balance between accuracy and cost.
Why do we insist on using Bluetooth as a technology for high-precision positioning systems? The biggest reason is that Bluetooth, as a standardized module, has been integrated into most intelligent equipment, including mobile phones, tablets, bracelets and so on. Therefore, we can do not use special positioning tags, but directly use these intelligent equipment for positioning; in addition, because these intelligent equipment is equipped with screens and voices, the navigation function after completing the positioning can be directly provided.