LocI

The project LocI was a 2021 winner of the PREMATURATION call for projects, led by the Innovation Lab of IP Paris.

Despite more than 20 years of indoor navigation research and development, it is still difficult to combine accuracy and easy implementations. LocI offers a simple and efficient approach to this problem using dedicated radio transmitters deployed withing the building.

LocI uses a strategy like the Global Navigation Satellite System (GNSS). A constellation of transmitters spread through the building provides signals which allow receivers to determine their location.

The system generates two synchronous coded signals, positioning is obtained through:

• Carrier phase difference measurements for distance estimates
• Angle of arrival calculation by interferometric measurements

Software Defined Radio (SDR) transmitters and receivers.
Dual antenna transmitters, Single antenna receiver.
2 emitters required at minima for 2D positioning, 3 minimum for 3D.

• Dual antenna for differential calculation:
  • Low noise and accurate signal
  • Decimetric positioning (for 2D precision in laboratory conditions)
• Very simple to deploy :
  • Autonomous transmitters
  • No calibration required
  • No synchronization required between transmitters nor with the receivers.
• Only a limited number of transmitters is necessary for high coverage of large spaces
• Receivers with low computing power (similar to those of a GNSS receiver)