Accession Number : AD0603959

Title :   THE FEASIBILITY OF A VELOCITY-DAMPED INERTIAL NAVIGATION SYSTEM.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Turley,Albert Ray ; Wilson,Robert John ,III.

Report Date : AUG 1964

Pagination or Media Count : 122

Abstract : A passive inertial navigation system generates position information containing an oscillating error. Previous flight-test results of a gimballess navigator clearly indicate this unwanted oscillation. External velocity information, reduced from aerial photographs, was successfully employed in the study to damp the oscillation in flights under the same dynamic environment. Comparison of undamped and damped position error curves proves velocity damping had little effect on average system error, but improves position uncertainty by approximately 43%. To optimize the inertial system for all flight conditions, the study results suggest a variable damping ratio. Values of 0.7 prior to take off and between 0.07 and 0.l after take off are recommended. (Author)

Descriptors :   (*INERTIAL NAVIGATION, FEASIBILITY STUDIES), (*DAMPING, VELOCITY), ACCELERATION, ERRORS, FLIGHT PATHS, MATHEMATICAL ANALYSIS, DIGITAL COMPUTERS, AERIAL PHOTOGRAPHY, OSCILLATION

Distribution Statement : APPROVED FOR PUBLIC RELEASE