Title :
Aircraft flight parameter estimation using acoustical Lloyd´s mirror effect
Author :
Lo, Kam W. ; Perry, Stuart W. ; Ferguson, Brian G.
Author_Institution :
Defence Sci. & Technol. Organ., Pyrmont, NSW, Australia
fDate :
1/1/2002 12:00:00 AM
Abstract :
A model is developed for the acoustical Lloyd´s mirror effect observed in the output time-frequency distribution of a microphone located near the ground during the transit of a jet aircraft. The feasibility of using this effect for flight parameter estimation is assessed by a simple Cramer-Rao lower bound analysis. The nonlinear least-squares method and the generalized Hough transform method are formulated for flight parameter estimation. The performances of both methods are evaluated and compared using real acoustic data
Keywords :
Hough transforms; acoustic field; acoustic wave interference; aircraft; least squares approximations; observability; parameter estimation; time-frequency analysis; Cramer-Rao lower bound analysis; acoustical Lloyd´s mirror effect; aircraft flight parameter estimation; background correction; generalized Hough transform; interference fringes; jet aircraft transit; microphone; nonlinear least-squares method; observability; output time-frequency distribution; sound field; temporal variations; Acoustic propagation; Acoustic sensors; Aircraft; Australia; Impedance; Interference; Microphones; Mirrors; Parameter estimation; Time frequency analysis;
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
