Accession Number:

ADA248897

Title:

Performance Parameter Methodology Update for Information Delivery Times

Descriptive Note:

Final rept.,

Corporate Author:

MITRE CORP BEDFORD MA

Personal Author(s):

Report Date:

1992-03-01

Pagination or Media Count:

56.0

Abstract:

This report documents the development of a methodology for determining the overall information delivery time specifications for the Cheyenne Mountain Upgrade CMU from the individual subsystem transit time specifications. Since little is known about the transit time distribution of each subsystem, each is approximated by a rectangular distribution. Then these rectangular distributions are convolved to determine the distribution of the overall system performance parameter, information delivery time. When many rectangular distributions must be convolved, a simplification employing the Central Limit Theorem is used to estimate the mean and variance of the systems overall distribution. This distribution is thought to be close to normal with no negative tail. When rectangular distributions with large variance are used, errors in the resulting distribution can occur. These errors, introduced by the simplification technique, are reduced either by using numerical methods for convolving discrete distributions sampled from the continuous curve or, when less accuracy is required, by an approximation technique involving the convolution of two uniform distributions. A comparison of the numerical results derived from this approach with results calculated in a previous study is also presented.

Subject Categories:

  • Statistics and Probability

Distribution Statement:

APPROVED FOR PUBLIC RELEASE