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Navigation of the Space ShuttleNavigational systems and operations for the Space Shuttle are described. All navigational instrumentation is controlled from within the pressurized main cabin. Measurements of the state vector and the attitude are made with an inertial measurement unit (IMU), which uses data initialized at the moment of take-off. Orbital location is calculated in approximations using the initial propulsion conditions, models of the gravity field, and aerodynamic drag forces. Updates are periodically received from ground tracking stations. IMU continues attitude information, and additional references are made with an automated startracker device. Information can also be gathered by optical alignment, and future systems will include radar tracking in an approach mode. Deorbit is accompanied by IMU altitude measurements as well as calculations of altitude based on drag measurements. Barometric measurements begin at about 80,000 ft altitude. Signals are received from TACAN beginning at 145,000 ft, and the microwave scanning beam landing system is started at 20,000 ft. Various radionavigation systems are also employed in all flight phases.
Document ID
19830043154
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Edwards, A., Jr.
(NASA Office of Space Transportation Systems, Space Shuttle Orbiter Div., Washington DC, United States)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Accession Number
83A24372
Distribution Limits
Public
Copyright
Other

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