Accession Number:

ADA030279

Title:

Applications of Variance Factors in Evaluations of Trajectory Solution Accuracies.

Descriptive Note:

Final rept.,

Corporate Author:

FEDERAL ELECTRIC CORP VANDENBERG AFB CALIF

Personal Author(s):

Report Date:

1976-01-09

Pagination or Media Count:

15.0

Abstract:

This report presents an expository description of certain statistics, called variance factors herein. These statistics play a dominant role whenever accuracies of trajectory coordinate solutions are evaluated since they effectively scale the standard deviations and covariances of the coordinate solutions. Conventionally, standard deviations often called GDOPs or uncertainties in range parlance are used to evaluate solution accuracies so that variance factors should be acknowledged whenever uncertainties are calculated. This is not always the case, sometimes variance factors are implicitly neglected. For example, the program called NITE that is currently used by SAMTEC to determine trajectory solutions and uncertainties has no capability to calculate variance factors consequently, uncertainties of trajectory solutions calculated by NITE may not be appropriately scaled i.e., compared to unity.

Subject Categories:

  • Statistics and Probability

Distribution Statement:

APPROVED FOR PUBLIC RELEASE