Accession Number:

AD0652816

Title:

A DELAYED COMMAND SYSTEM FOR A NEAR-EARTH SATELLITE.

Descriptive Note:

Master's thesis,

Corporate Author:

JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s):

• Cooperman,Richard S.

Report Date:

1967-04-01

Pagination or Media Count:

99.0

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.

Descriptors:

• *SPACECRAFT
• *GEODESICS
• *TRIANGULATION
• ACCURACY
• ARTIFICIAL SATELLITES
• INTEGRATED CIRCUITS
• CORE STORAGE
• MAGNETIC CORES
• MEMORY DEVICES
• WIRING DIAGRAMS
• MODULES(ELECTRONICS)
• RELIABILITY(ELECTRONICS)
• PACKAGING
• REAL TIME
• CLOCKS
• GRAVITY
• COMMAND AND CONTROL SYSTEMS
• STARS
• NIGHT PHOTOGRAPHY

Subject Categories:

• Geodesy
• Computer Hardware
• Spacecraft Trajectories and Reentry
• Command, Control and Communications Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE