In reply to Chris Atkeson's posting about three-dimensional measurement
systems, here is a list of manufacturers from the appendix of my upcoming
book on gait analysis (sorry, shouldn't advertise!). Not all the systems
are suitable for tracking airborne targets, but some (eg Videomex, TrackEye,
VRS and Eagle) were actually designed for this purpose.

Mike Whittle
Professor of Rehabilitation Technology
University of Tennessee at Chattanooga
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Ariel Performance Analysis System, Inc.
(Videotape-based Kinematic system)
6 Alicante
Trabuco Canyon
California 92679
USA
Telephone: +1-714-858-4216

Bioengineering Technology and Systems
(Elite: television-based kinematic system)
Via Capecelatro 66
20148 Milano
Italy
Telephone: +39-2-4047896

Charnwood Dynamics Ltd.
(Coda 3: kinematic system using optical scanners)
63 Forest Road
Loughborough
Leicestershire LE11 3NW
England
Telephone: +44-509-233224

Columbus Instruments
(Videomex: television/computer tracking system)
PO Box 44049
Columbus
Ohio 43204
USA
Telephone: +1-614-488-6176

Eastman Kodak Company
(SP2000: high-speed videotape system)
11633 Sorrento Valley Road
San Diego
California 92121
USA
Telephone: +1-619-535-2909

HCS Vision Technology BV
(PRIMAS: television-based kinematic system)
Hurksestraat 18d
5652 AK Eindhoven
The Netherlands

Innovativ Vision AB
(TrackEye: image analysis system)
Teknikringen 1
S-583 30 Linkoping
Sweden
Telephone: +46-13-214060

Log.In srl
(CoStel: kinematic system using active markers)
Via Aurelia 714
00165 Roma
Italy
Telephone: +39-6-6807044

Motion Analysis Corporation
(ExpertVision: television-based kinematic system)
3650 North Laughlin Road
Santa Rosa
California 95403
USA
Telephone: +1-707-579-6511

Northern Digital Inc.
(Watsmart and Optotrak: kinematic systems with active markers)
403 Albert Street
Waterloo
Ontario N2L 3V2
Canada
Telephone: +1-519-884-5142

Oxford Metrics
(Vicon: television-based kinematic system)
Unit 8
7 West Way
Oxford OX2 0JB
England
Telephone: +44-865-244656

Peak Performance Technologies Inc.
(Peak Performance: videotape-based kinematic system)
7388 S Revere Parkway
Suite 801
Englewood
Colorado 80112
USA
Telephone: +1-303-799-8686

Selspot AB
(Selspot: kinematic system using active markers)
Sallarangsgatan 3
S-431 37 Molndal
Sweden
Telephone: +46-31-870710

Tau Corporation
(VRS and Eagle: television/computer image analysis systems)
485 Alberto Way
Los Gatos
California 95032
USA
Telephone: +1-408-395-9191