Accession Number:

AD0838794

Title:

MINIMUM VARIANCE BETA ESTIMATION WITH DYNAMIC CONSTRAINTS

Descriptive Note:

Technical Report

Corporate Author:

PAN AMERICAN WORLD AIRWAYS INC PATRICK AFB FL PATRICK AFB United States

Personal Author(s):

Report Date:

1968-03-01

Pagination or Media Count:

29.0

Abstract:

The degree to which the ballistic coefficient beta can be estimated from reentry metric data can be meaningfully analyzed with a sophisticated computer program which realistically models the problem and performs a proper error analysis of the estimation procedure. Such a program has been developed at AFETR and is being used to isolate the primary error sources in the beta estimation task. This computer program is additionally used to determine what success in beta estimation can be achieved with foreseeable instrumentation accuracies. Results are included that illustrate the effects on beta estimation from the following variations 1 instrumentation measurement type and accuracy 2 relative geometry between trajectory and observer 3 arc length and minimum altitude of tracking and 4 the magnitude of beta. The central thesis of the analysis presented in this report is that dynamic constraints can be used to advantage in the problem of estimating the trajectory and ballistic coefficient. The least squares, constrained solution takes advantage of the exercise of tracking geometry over a sufficiently long arc to estimate the trajectory parameters and beta. For a given set of tracking instrumentation, the enforcement of dynamic constraints throughout the entire trajectory should provide the maximum available information to the estimation process.

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE