Position determining system
US3936632A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 3, 1974 |
| Grant date | Feb 3, 1976 |
| Priority date | — |
| Expiry date | Jan 3, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S3/782
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A system for precisely determining the position of a beam of incident radiation. In one embodiment in the disclosure the system is utilized in an orbiting, Ritchey-Chretien telescope to determine the precise position of the image of a guide star in the focal plane of the telescope. In that embodiment a first reticle plate, having concentric ring reticle lines, is located at the edge of the tangential focal surface of the telescope and outside of the focal area being used for observation. A second reticle plate, having radial reticle lines, is located adjacent to the first reticle plate at the edge of the sagittal focal surface of the telescope and outside of the focal area being used for observation. A relay lens system and an image dissector tube are positioned behind the reticle plates so that light refracted by the reticle plates is passed by the relay lens system to the image dissector tube. A guide star is imaged on the first and second reticle plates. Light in the star image which is imaged onto either an apex or a groove in the reticle plates is split into separate beams in dependence upon the exact position of the image relative to the apex or groove. The position of the gu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.