Accession Number:

ADA055179

Title:

An Extended Kalman Filter Fire Control System Against Air-To-Air Missiles. Volume I.

Descriptive Note:

Master's thesis,

Corporate Author:

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

Report Date:

1977-12-01

Pagination or Media Count:

144.0

Abstract:

A previously designed Extended Kalman Filter, based upon the proportional guidance law and an aerodynamic drag equation, is modified to include complete modeling of the autopilot and the guidance system of the missile. A sensitivity analysis of three key parameters is performed to determine the observability of these parameters and the possible need to estimate them in less complex filter models. This analysis establishes the advantages for reasonable estimates of all three parameters during a high-g trajectory. A less complex model reduces the number of filter states from eleven to eight. The seeker dynamics, the guidance system, and the autopilot of a missile are approximated by a first order lag. The three parameters estimated include the time constant of the first order lag, the proportional navigation constant of the missile, and the ratio of mass to cross-sectional area of the missile. Under the high-g scenario, reasonably accurate estimates of the states and the parameters are accomplished. Under the low-g scenario, parameter estimates are degraded due to lack of excitation. This performance of the parameters, however, does not hinder the accurate estimation of the missile states. Author

Subject Categories:

  • Statistics and Probability
  • Computer Programming and Software
  • Antimissile Defense Systems
  • Fire Control and Bombing Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE