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A numerical algorithm to propagate navigation error covariance matrices associated with generalized strapdown inertial measurement unitsThe design and operation of a Strapdown Navigation Analysis Program (SNAP) developed to perform covariance analysis on spacecraft inertial-measurement-unit (IMU) navigation errors are described and demonstrated. Consideration is given to the IMU modeling subroutine (with user-specified sensor characteristics), the data input procedures, state updates and the simulation of instrument failures, the determination of the nominal trajectory, the mapping-matrix and Monte Carlo covariance-matrix propagation methods, and aided-navigation simulation. Numerical results are presented in tables for sample applications involving (1) the Galileo/IUS spacecraft from its deployment from the Space Shuttle to a point 10 to the 8th ft from the center of the earth and (2) the TDRS-C/IUS spacecraft from Space Shuttle liftoff to a point about 2 h before IUS deployment. SNAP is shown to give reliable results for both cases, with good general agreement between the mapping-matrix and Monte Carlo predictions.
Document ID
19900060658
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Weir, Kent A.
(Control Dynamics Co. Huntsville, AL, United States)
Wells, Eugene M.
(Control Dynamics Co. Huntsville, AL, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Report/Patent Number
AIAA PAPER 90-3463
Meeting Information
Meeting: AIAA Guidance, Navigation and Control Conference
Location: Portland, OR
Country: United States
Start Date: August 20, 1990
End Date: August 22, 1990
Accession Number
90A47713
Funding Number(s)
CONTRACT_GRANT: NAS8-36570
Distribution Limits
Public
Copyright
Other

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