Bluetooth BLE greatest feature is the reduction in cost and power consumption, and is suitable for real-time high demand areas. In addition to the slower transfer rates, but also supports one to many broadcast through Mesh technologies-many still do;
Four innovative applications on Bluetooth history : audio transmission, low-power data transmission, positioning, network equipment.
Bluetooth 4.2: There was a certain location function
Bluetooth 5.0: positioning accuracy of less than 1 m, accuracy is higher than V4.2; rate * 2; distance of 300 m; lower power consumption
Bluetooth 5.1: Improvement Generic Attribute Profile (GATT) cache, faster, more energy is connected through a multi-antenna reception RSSI measured intensity and direction , accuracy centimeter level, but in the case of co-channel interference is 2.4G to achieve unknown; while increasing the complexity and hardware costs of the base station of Bluetooth. Scenario: find the (direction finding) function "with Bluetooth proximity (proximity) technology available close to the perception of Technology (vocal point) , so that the device can be detected more easily found (missing back) / monitor was monitored object mobile / alarm trigger restricted access area / library books was interested in pointing / parking guidance and other vehicles too.
Bluetooth positioning principle:
RSSI-based principle, divided into a terminal positioned (relative) :( fat such as smart phones come RSSI signal by identifying the different Bluetooth devices (at least 3:00)); network side positioning (entering Bluetooth gateway terminal (refer to point positioning) broadcast within the range information, Bluetooth gateway receives (n, RSSI) and will have to coordinate their own background and then transmitted to the server, the server backstage and get targeted based on each RSSI location algorithm). Application: Fire trapped positioning system (integrated in the floor of each aisle each smoke obtained above as a reference point in the Bluetooth function, the art as the target node, a gateway for each corridor, the reference point information sent fire personnel hand Bluetooth was on return to their state of health after the bracelet was received, information was received at the reference point but also by everyone get information (n, RSSI) and related that she has coordinates (x, y) sent back through the gateway command center , the command center can be a dielectric and the respective reference points of each row have been RSSI specific location.
Module manufacturers: the cloud was launched in a series of Bluetooth 5.0 indoor positioning products, including Bluetooth 5.0 module MS50SFB, Bluetooth 5.0 Bluetooth Beacon, Bluetooth 5.0 and Bluetooth 5.0 gateway card work
Dialog has a strong technical strength too (Apple Special) in the field of power management, SmartBond ™ DA1469x Bluetooth low energy SoC ( based on ARM Cortex-M33 (96 MHz) core + ARM Cortex-M0 + core ) series has Bluetooth orientation function ( ie, reached the angle (angle of Arrival, AoA) and departure angle (angle of departure, AoD) features support ), can detect the signal direction within 5 degrees, the antenna design are very important.
AOA its working process: angle of arrival (AOA) measurements, the transmitter is transmitting through a single antenna special data packet, the receiver receives through the multiple antennas, each antenna due to the different distance from the transmitter, phase difference occurs. Calculate the angular relationship between each other by a distance between the antennas and the phase difference, direction finding using trilateration.
The main application scenario: the RTLS (Real Time Location System), object tracking and landmark information , (installed asset battery powered low power Bluetooth transmitter (tag), sends an asset current position and received signal strength of the Bluetooth receive a fixed position the device, precise positioning; indoor localization system (IPS) solution: improved navigation experience ( to be AOA mounting angle of arrival measurement Beacon (Bluetooth transmitter) facility in a fixed position, through mobile positioning Beacon and from various known applications. position received signal strength to calculate its current position by trilateration)
AoD method mainly for indoor localization system (Indoor Location System, IPS), and it is to the opposite angle method, a multi-antenna transmitter, the receiver is a single antenna. When the transmitter between the active antenna array in a switching arrangement, to send a special data packet, the receiver receives signals through a single antenna IQ samples and to obtain, calculate the relative phase of the final signal. Now, with the introduction of a new direction finding, Bluetooth proximity class solutions will be able to add a function associated with the device orientation. For example, item tracking solution that will not only inform the user that has the label position near the property, but also to let the user know the direction which it is located, significantly improve the user experience.
The main scenarios: logistics, warehousing
Point of interest information Scene: The main usage scenario is used in museums and the like, each of the exhibits in the exhibition hall can own beacon information when visitors with smart phones, have the appropriate app support on the phone, through each exhibit , you will automatically get the information about the exhibits
Find articles scene. This is mainly when used to find personal items, such as wallets, keys, and other products with Bluetooth is missing, you can use this feature to quickly locate their position at home.
RTLS scenario follows: to deploy several loactor (positioner) and a location engine (machine center) in several different positions, the image above is positioned tag needs to carry beacon includes the function of Bluetooth products. RTLS positioning follow the principle Trilateration (trilateral Ranging): Each loactor loaction engine requires periodic reports to monitor their tags (first gene), and the RSSI value (second factor) between them, plus on loacation engine know where the location of each loactor (third reason), will be able to locate the position of the tags
Indoor Positioning scene: the scene with real-time positioning the contrary, we must first install the appropriate Guest phone app, also follow the same IPS wayfinding trilateral ranging principle: the phone app which can be heard in loactor beacon (first cause), and they RSSI value (second factor) between, and each loactor position (third reason), you can know where you are in the
Jen accelerate the development of microelectronics compliant with the Bluetooth specification 5.1 centimeter-level precision positioning of Bluetooth products