Geops Systems

ACHIEVEMENTS

The following tests were realized with only 5 bases (detectors). Better precision and 3D positioning would have been achieved if more bases could have been placed on upper floors.
Bases are not synchronized: time fluctuations are estimated and compensated by the system at runtime. Tag positions are estimated and displayed every second (videos are a bit accelerated).

Indoor tests – office

Indoor tests – exhibition

Indoor tests – parking lot

Outdoor tests

TECHNOLOGY

  • Localization by TDOA (Time Difference Of Arrival).
  • Tags transmit, bases (detectors) receive.
  • 20Mhz-wide proprietary radio modulation and protocol in the 2.4GHz band.
  • 2ms-long transmissions, –137dB receiver sensitivity.
  • More than 1km range in line-of-sight conditions.
  • Bases are not synchronized: time fluctuations are estimated and compensated by the system at runtime.
  • Measured times of arrival are collected by Ethernet connections (could be replaced by wireless links).
  • Programmable transmit rate from 10 times per second to once per day.
  • Small form-factor tags (30mm × 30mm), can operate with a standard coin cell while transmitting every 10s.
  • Tags include an accelerometer for various purposes (fall detection, battery saving while not moving…).

CONTACT