The modern test range requires a portable, highly accurate tracking mount to provide time space and position information (TSPI) for data analysis. The manufacture of such a mount requires: a design for accuracy and producibility, a meticulous attention to error reduction, and precision measuring techniques to evaluate true accuracy.
John Bruce Totty, John Bruce Totty,
"High-accuracy portable compact tracking system", Proc. SPIE 1757, Ultrahigh- and High-Speed Photography, Videography, and Photonics, (19 January 1993); doi: 10.1117/12.139150; https://doi.org/10.1117/12.139150