Accession Number:

AD0759806

Title:

Navigation Schemes for LES-8/9 Autonomous Stationkeeping System.

Descriptive Note:

Technical note,

Corporate Author:

MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB

Personal Author(s):

• Srivastava,Sushanta

Report Date:

1973-04-20

Pagination or Media Count:

27.0

Abstract:

TEM.Technical note,Srivastava,Sushanta TN -1973-18F19628-73-C-0002AF-649LESDTR-73-85synchronous satellites, celestial guidance, scientific satellites, circular orbits, detectors, horizon scanners, yaw, drift, attitude control systems, celestial mechanicsles-9 satellite, les-8 satellite, stationkeeping, design specificationsThe autonomous stationkeeping system for LES-89 controls the mean longitude of the satellite by on board navigation. The longitude is computed from the observations of an infrared earth-horizon scanner, sun azimuth transit sensors and an earth-shadow sensor. The compensation for non-uniform sun motion for any near ecliptic satellite orbit is generated by an ephemeris synthesizer. The time reference is obtained from a stabilized oscillator. The report describes various considerations for the design of the navigation scheme. Author

Descriptors:

• (*SYNCHRONOUS SATELLITES
• *CELESTIAL GUIDANCE)
• (*SCIENTIFIC SATELLITES
• *CIRCULAR ORBITS)
• DETECTORS
• HORIZON SCANNERS
• YAW
• DRIFT
• ATTITUDE CONTROL SYSTEMS
• CELESTIAL MECHANICS

Subject Categories:

• Space Navigation and Guidance
• Unmanned Spacecraft
• Spacecraft Trajectories and Reentry

Distribution Statement:

APPROVED FOR PUBLIC RELEASE