Direction determining method and apparatus
US4023908A · kind A · utility
17Cited by
2References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1976 |
| Grant date | May 17, 1977 |
| Priority date | — |
| Expiry date | Jan 12, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C15/004
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A direction finding system is disclosed in which a predetermined horizontal plane is established by the projection from one location of an image having illuminated and unilluminated portions corresponding to the predetermined horizontal plane. A receiver at a remote location detects the image at two spaced points and produces an indication of the center of the transition zone between the illuminated and unilluminated portions of the projected image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.