Method and system for modulating a light source in a light based positioning system using a DC bias
US8334901B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 2012 |
| Grant date | Dec 18, 2012 |
| Priority date | — |
| Expiry date | Jun 19, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S2201/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In one aspect, the present disclosure relates to a method for modulating a beacon light source in a light based positioning system. In some embodiments, the method includes selecting a modulation scheme for the light source, the modulation scheme periodically varying an output of the light source from a peak output level to a bottom output level, applying the modulation scheme to the light source, and adding a DC bias to the modulation scheme, the DC bias reducing the peak output level and increasing the bottom output level of the modulation scheme. In some embodiments, the peak output level is increased beyond an un-modulated output of the light source and an average output of the light source is substantially equal to the un-modulated output of the light source. In some embodiments, the peak output level includes an un-modulated output of the light source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.