Browse Prior Art Database

Communications System

IP.com Disclosure Number: IPCOM000077816D
Original Publication Date: 1972-Sep-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Culver, WH: AUTHOR

Abstract

The subject electrooptics communications system includes a movable terminal with a retroreflector and an information data source (e.g., a TV camera sensor).

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Communications System

The subject electrooptics communications system includes a movable terminal with a retroreflector and an information data source (e.g., a TV camera sensor).

Another terminal in the system is a stationary control station, which includes an information data display and an active optical tracker that tracks the retroreflector on the movable terminal. The reflectivity of the retroreflector is modulated with the data from the information source, so that the tracking return signal has the sensor information imposed on it.

Several approaches are possible for implementing the retromodulator. One approach is based upon the use of an optical laser tracker with concentric telescope optics having a mirror at the focus. The telescope optics can be made into a retromodulator by incorporating a means to modulate the light reflected from the curved focal surface, whether through interference phenomena or by defocusing the optics by mechanical motion of the mirror surface. Further information regarding this method appears in Spherical MIROS by P. O. Minolt in Proceedings of the Space Optical Technology Conference, Vol. I, p.33, Huntsville, Alabama, April 1966.

Another approach is to incorporate a modulation means into a corner reflector. Various modulation schemes to be found in the open literature will apply. This technique has the disadvantage of altering the polarization of the light being reflected.

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