Sensors, Vol. 20, Pages 5596: A Comprehensive Study on Light Signals of Opportunity for Subdecimetre Unmodulated Visible Light Positioning

Sensors, Vol. 20, Pages 5596: A Comprehensive Study on Light Signals of Opportunity for Subdecimetre Unmodulated Visible
Light Positioning
Sensors doi: 10.3390/s20195596
Authors:
Bastiaens
Deprez
Martens
Joseph
Plets

Currently, visible light positioning (VLP) enabling an illumination infrastructure requires a costly retrofit. Intensity modulation systems not only necessitate changes to the internal LED driving module, but decrease the LEDs’ radiant flux as well. This hinders the infrastructure’s ability to meet the maintained illuminance standards. Ideally, the LEDs could be left unmodulated, i.e., unmodulated VLP (uVLP). uVLP systems, inherently low-cost, exploit the characteristics of the light signals of opportunity (LSOOP) to infer a position. In this paper, it is shown that proper signal processing allows using the LED’s characteristic frequency (CF) as a discriminative feature in photodiode (PD)-based received signal strength (RSS) uVLP. This manuscript investigates and compares the aptitude of (future) RSS-based uVLP and VLP systems in terms of their feasibility, cost and accuracy. It demonstrates that CF-based uVLP exhibits an acceptable loss of accuracy compared to (regular) VLP. For point source-like LEDs, uVLP only worsens the trilateration-based median p50 and 90th percentile root-mean-square error p90 from 5.3 cm to 7.9 cm (+50%) and from 9.6 cm to 15.6 cm (+62%), in the 4 m 4 m room under considerat...

Source: Sensors - September 28, 2020 Category: Biotechnology Authors: Bastiaens Deprez Martens Joseph Plets Tags: Article Source Type: research