Tracking Baseballs Using Doppler Radar Technology:
The TrackMan System
Evaluation of Doppler radar ball tracking and its experimental uses, the MS thesis of Jeff Martin at Washington State University, December 2012. Jeff gives an excellent description of both the general principles of radar tracking and the specific implementation utilized by TrackMan. He then describes experiments done utilizing TrackMan to learn about drag and lift coefficients.
Determing the 3D Spin Axis from TrackMan Data: In this article, I develop a technique to determine the direction of the spin axis for pitched baseballs, utilzing the measurement of the total spin from TrackMan and the magnitude and direction of the spin-induced deflection from the trajectory. An accompanying spreadsheet is a template for the calculations.
TrackMan, an excellent discussion about TrackMan at Tom Tango's blog from April 2011. The discussion was initially about the article How a Danish tech company is revolutionizing pitching data, by Tom Verducci, which appeared in Sports Illustrated.
An Introduction to TrackMan Baseball, a talk given by Rob Ristagno, at the time the Director of Business Development for TrackMan, presented at SABR40 in Atlanta, August 7, 2010, as part of a panel on new technologies in baseball.
Method of and apparatus for determining information relating to a projectile: This is the patent application of TrackMan CTO Fredrik Tuxen, dated December 2007. The overall method of using a phased-array Doppler radar device to track a sports ball is presented. A particularly good description is given of the so-called multi-path problem.
Determination of spin parameters of a sports ball: This is the patent application of TrackMan CTO Fredrik Tuxen, dated March 2009. It describes the method used by the TrackMan radar for determining the spin rate from frequency analysis and the spin axis from trajectory analysis.