A DELAYED COMMAND SYSTEM FOR A NEAR-EARTH SATELLITE.
Abstract
The paper describes a digital solid-state delayed command system using a high-accuracy real-time clock designed for near-earth satellites. The system was designed to control the operation of the optical beacon geodesy experiment on the GEOS B Satellite. Extensive use has been made of high-reliability low-power monolithic integrated circuits for processing and clock circuits; a small magnetic-core memory has been used for data storage. In its present configuration the system can remotely initiate up to 59 separate optical beacon operations per command message. Operations are initiated coincident with any satellite generated minute mark; satellite minute marks are maintained within plus or minus 10 microseconds of universal time. Satellite minute markers are transmitted on three separate carrier frequencies to provide accurate time information on a world-side basis. System and logical design details are presented.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1967
- Accession Number
- AD0652816
Entities
People
- Richard S. Cooperman
Organizations
- Johns Hopkins University Applied Physics Laboratory