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Proceedings Paper

Passive electro-optical projectiles tracker
Author(s): Ilya Agurok; Waqidi Falicoff; Roberto Alvarez; Will Shatford
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Paper Abstract

Surveillance, detection, and tracking of multiple high-speed projectiles, particularly bullets, RPGs, and artillery shells, can help military forces immediately locate sources of enemy fire and trigger countermeasures. The traditional techniques for detection and tracing of fast moving objects typically employ various types of radar, which has inherently low resolution for such small objects. Fast moving projectiles are aerodynamically heated up to several hundred degree Kelvin temperatures depending on the speed of a projectile. Thereby, such projectiles radiate in the Mid- Infrared (MWIR) region, where electro-optical resolution is far superior, even to microwave radars. A new passive electro-optical tracker (or PET) uses a two-band IR intensity ratio to obtain a time-varying speed estimate from their time-varying temperatures. Based on an array of time-varying speed data and an array of azimuth/ elevation angles, PET can determines the 3D projectile trajectory and back track it to the source of fire. Various methods are given to determine the vector and range of a projectile, both for clear and for non-homogeneous atmospheric conditions. One approach uses the relative intensity of the image of the projectile on the pixels of a CCD camera to determine the azimuthal angle of trajectory with respect to the ground, and its range. Then by using directions to the tracked projectile (azimuth and elevation angles of the trajectory) and the array of instant projectile speeds, PET determines the distance to the projectile at any point on its tracked trajectory or its predicted trajectory backwards or forwards in time. A second approach uses a least-squares optimization technique over multiple frames based on a triangular representation of the smeared image to yield a real-time trajectory estimate. PET's estimated range accuracy is 0.2 m and the azimuth of the trajectory can be estimated within 0.2°.

Paper Details

Date Published: 21 June 2012
PDF: 15 pages
Proc. SPIE 8359, Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security and Homeland Defense XI, 835916 (21 June 2012); doi: 10.1117/12.919529
Show Author Affiliations
Ilya Agurok, Light Prescriptions Innovators, LLC (United States)
Waqidi Falicoff, Light Prescriptions Innovators, LLC (United States)
Roberto Alvarez, Light Prescriptions Innovators, LLC (United States)
Will Shatford, Light Prescriptions Innovators, LLC (United States)

Published in SPIE Proceedings Vol. 8359:
Sensors, and Command, Control, Communications, and Intelligence (C3I) Technologies for Homeland Security and Homeland Defense XI
Edward M. Carapezza, Editor(s)

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