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Basic research for the geodynamics programThe mathematical models of space very long base interferometry (VLBI) observables suitable for least squares covariance analysis were derived and estimatability problems inherent in the space VLBI system were explored, including a detailed rank defect analysis and sensitivity analysis. An important aim is to carry out a comparative analysis of the mathematical models of the ground-based VLBI and space VLBI observables in order to describe the background in detail. Computer programs were developed in order to check the relations, assess errors, and analyze sensitivity. In order to investigate the estimatability of different geodetic and geodynamic parameters from the space VLBI observables, the mathematical models for time delay and time delay rate observables of space VLBI were analytically derived along with the partial derivatives with respect to the parameters. Rank defect analysis was carried out both by analytical and numerical testing of linear dependencies between the columns of the normal matrix thus formed. Definite conclusions were formed about the rank defects in the system.
Document ID
19910009238
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Date Acquired
September 6, 2013
Publication Date
January 1, 1991
Subject Category
Geophysics
Report/Patent Number
NASA-CR-187959
NAS 1.26:187959
Accession Number
91N18551
Funding Number(s)
PROJECT: OSURF PROJ. 711055
OTHER: NSG-5265
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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