Optical distance measurement
US6753950B2 · kind B2 · utility
53Cited by
5References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 21, 2002 |
| Grant date | Jun 22, 2004 |
| Priority date | — |
| Expiry date | Oct 21, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S17/32
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Optical distance equipment transmits an optical signal and determines distance by locating the peak of a correlation with the reflected signal. The number of calculations required for the correlation is greatly reduced by using a combination of a coarse and fine correlation. The accuracy of the distance measurement is also improved by calculating the point of intersection of two best fit lines to either side of the correlation peak. The signal is preferably modulated by a maximum length sequence.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.