Accession Number:

ADA151846

Title:

Investigation of a Failure Detection/Identification System for a Tactical Aircraft Navigation System

Descriptive Note:

Master's thesis

Corporate Author:

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

Personal Author(s):

• Johnston, G. R.

Report Date:

1984-12-01

Pagination or Media Count:

312.0

Abstract:

The purpose of this thesis was to develop a suitable filter model and failure detectionidentification FDI processor as a basis for a fully simulated adaptive tactical navigation ATN system. A 52-state truth error model was developed from which a 26-state filter error model was derived. The measurement process uses a six measurement satellite positioning system three velocity measurements and three position measurements, a three measurement Doppler radar, and a terrain correlation system. The filter residuals for the different measurement processes are then used in N-step likelihood function computations to observe the residual behavior. Two different testing criteria have been developed for failure declaration. Simple threshold establishment and the tracking of the likelihood function N-step characteristics are used for this purpose. Based on the statistics of the observed failure characteristics, an isolation processor isolates the fault and makes the correct identification. Originator-Supplied Keywords include Detection, Detectors, Kalman Filtering, Isolation, Filters, and Failure.

Descriptors:

• *TACTICAL AIRCRAFT
• *TACAN
• POSITION(LOCATION)
• COMPUTATIONS
• DETECTION
• MODELS
• DOPPLER RADAR
• STATISTICS
• FAILURE
• ISOLATION
• KALMAN FILTERING
• TRACKING
• THESES
• PROCESSING EQUIPMENT
• TERRAIN
• RESIDUALS
• IDENTIFICATION SYSTEMS
• ADAPTIVE SYSTEMS
• BEHAVIOR
• FILTERS
• FUNCTIONS(MATHEMATICS)
• VELOCITY
• MEASUREMENT

Subject Categories:

• Air Navigation and Guidance

Distribution Statement:

APPROVED FOR PUBLIC RELEASE