Accession Number:

ADA238799

Title:

A Multiple Model Adaptive Estimator Using First and Second-Order Acceleration Models for Use in a Forward-Looking Infrared Tracker

Descriptive Note:

Master's thesis

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s):

Report Date:

1991-06-01

Pagination or Media Count:

388.0

Abstract:

The performance of a multiple model adaptive estimator MMAE for an enhanced correlatorforward-looking-infrared tracker for airborne targets is analyzed in order to improve its performance. Performance evaluation is based on elemental filter selection and MMAE estimation error sizes and trends. The elemental filters are based on either first or second-order acceleration models. Improved filter selection is achieved by using acceleration models that separate the frequency content of acceleration power spectral densities into non- overlapping regions with second-order models versus the more traditional overlapping regions with first-order models. A revised tuning method is presented. The maximum a posteriori MAP versus the Bayesian MMAE is investigated. The calculation of the hypothesis probability calculation is altered to see how performance is affected. The impact of the ad hoc selection of a lower bound on the elemental filter probability calculation to prevent filter lockout is evaluated. Parameter space discretization is investigated. Comparable performance is achieved from the MMAEs based on either first or second-order acceleration models. The MAP and Bayesian options give comparable performance. A lower bound of 0.001 gives best results. The traditional probability calculation allows better filter selection by the MMAE for this application.

Subject Categories:

  • Infrared Detection and Detectors
  • Target Direction, Range and Position Finding

Distribution Statement:

APPROVED FOR PUBLIC RELEASE