Chapter 1 Summary
Chemical plant is a high-risk industrial field. In recent years, safety accidents have
caused great losses to employees and enterprises. Therefore, personnel positioning
management has become an effective means to reduce potential safety hazards and realize
digital and intelligent management in the plant area. Bluetooth RSSI positioning is one of
the existing indoor positioning technologies. The factory staff can find out their own
position and report to the gateway by wearing positioning cards and scanning the RSSI
strength of beacon. Lierda S1 positioning beacon is used as the transmitter of positioning
signal in chemical plant. The advantage of this technology is that the software and
hardware design of transmitter is simple, and the power consumption is very low.
1.1 Working principle
The S1 positioning beacon is installed on the indoor ceiling of the factory on a grid
basis. Each positioning beacon has its own unique ID number. The personnel positioning
card is worn on the workers, and Bluetooth module and Lora module are integrated in the
card. When the locator is in a certain position in the room, the Bluetooth module in the card
will search the RSSI signal strength value of beacon nearby, and then upload the data to
lorawan gateway through Lora module. The background determines the specific position of
personnel according to the RSSI value and beacon ID number.
1.2 Working conditions
Temperature：-20℃～60℃；
Average relative humidity：Less than 95%(25℃)；
Atmospheric pressure：80kPa～106kPa；
CE working frequency: 2400MHZ~2483.5MHZ
Transmit power: -20dBm~4dBm (adjustable by userAPP)
