BLE Beacon technology

BLE Beacon technology was first proposed by Apple iBeacon, and then Google also supported EddyStone's Beacon scheme. 

Beacon technology mainly sends broadcast messages periodically through Beacon, and the terminal performs position calculation

after receiving it.

The world's most famous Beacon companies:

Beacon-based positioning is mainly calculated by the signal strength of broadcast messages sent by Beacon. The signal strength

can be converted into distance calculation, and the fingerprint of signal strength can also be compared. However, due to the low

reliability of signal strength, the positioning accuracy based on Beacon is generally about 3 meters. The stability is poor.

There are two scenarios based on Beacon positioning. One is the mobile phone scheme. After receiving the Beacon signal, the

mobile phone calculates its own position and can integrate the sensor inside the mobile phone. The other is the label scheme. After

the label receives the Beacon, it sends the sampled Beacon ID, signal strength and other information back to the server through the

data channel for calculation. The second mode is what we are mainly using now. For this positioning mode, the main features are as

follows:

1. Multi-dimensional support

-- Zero-dimensional positioning: can be done, recommended;

One-dimensional positioning: can be done, but not accurate enough

-- Two-dimensional positioning: can be done, but not accurate enough

- Three-dimensional positioning: not recommended, difficult, poor accuracy;

BLE positioning is best to be able to integrate with the sensor to reduce positioning fluctuations.

2, positioning accuracy is not high

In two-dimensional positioning of the scene first, the ideal accuracy is 3 meters. The deployment distance between beacons should

not exceed 10 meters;

3. Positioning accuracy is related to deployment density

The shorter the spacing of Beacon deployment, the higher the positioning accuracy;

4. Complex environment

It is recommended for simple use in complex environments, and do not expect to obtain high-precision positioning with Beacon.