Distance detection method and system
US8619241B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 1, 2012 |
| Grant date | Dec 31, 2013 |
| Priority date | — |
| Expiry date | Oct 1, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
There is provided a system and method for detecting a distance to an object. The method comprises providing a lighting system having at least one pulse width modulated visible-light source for illumination of a field of view; emitting an illumination signal for illuminating the field of view for a duration of time y using the visible-light source at a time t; integrating a reflection energy for a first time period from a time t−x to a time t+x; determining a first integration value for the first time period; integrating the reflection energy for a second time period from a time t+y−x to a time t+y+x; determining a second integration value for the second time period; calculating a difference value between the first integration value and the second integration value; determining a propagation delay value proportional to the difference value; determining the distance to the object from the propagation delay value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.