Share Email Print
cover

Proceedings Paper

Range rate estimation based on geometric feature decomposition
Author(s): Graham H. Watson; Simon A. Watts; Sharon K. Watson
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

A method of estimating relative range rate for airborne targets based on projective geometry is presented, where robustness to noise and clutter is achieved using a wavelet representation. The first stage is to extract simple geometric bar features at multiple resolutions from local extrema in a wavelet transform. These are then refined in position, orientation, scale and aspect ratio to fit regions of the target, for examples wings and fuselage. Affine transformations are then found which map these geometric components between image frames. Finally a relationship between affine transformations and changes in 3D viewing aspect is used to estimate inter-frame range ratio. This method has the robustness of those based on first and second-order moments while retaining sufficient information to unambiguously identify an affine transformation between frames. The method does not depend on region segmentation to define an outline of the target, and is therefore insensitive to noise. Results are presented for 3D simulations of aircraft flying against a background of sky with clouds, where accurate range data are available. Range ratios are accurate over a wide range of 3D target orientations, but errors are more pronounced when new parts of the target become visible.

Paper Details

Date Published: 4 October 1999
PDF: 11 pages
Proc. SPIE 3809, Signal and Data Processing of Small Targets 1999, (4 October 1999); doi: 10.1117/12.364046
Show Author Affiliations
Graham H. Watson, Defence Evaluation and Research Agency Farnborough (United Kingdom)
Simon A. Watts, Defence Evaluation and Research Agency Farnborough (United Kingdom)
Sharon K. Watson, Defence Evaluation and Research Agency Farnborough (United Kingdom)


Published in SPIE Proceedings Vol. 3809:
Signal and Data Processing of Small Targets 1999
Oliver E. Drummond, Editor(s)

© SPIE. Terms of Use
Back to Top