Patent ID: 7856334

Claim:
A method comprising; (a) producing mechanical oscillations by a first oscillator, wherein said first oscillator is placed in motion; (b) retroreflecting electromagnetic radiation from a first virtual point mechanically fixed to said first oscillator; wherein said first virtual point is also placed in motion; (c) measuring time; (d) tracking said first virtual point from a first spherical coordinate measurement system; (e) measuring from said first spherical coordinate measurement system to said first virtual point, at a plurality of times t n , to produce a plurality of measurements M 1,n , wherein each element n of said M 1,n is an ordered set comprising; t n and at least one parameter synchronized with said t n from the group consisting of; range r 1,n , a first angle α 1,n , a second angle θ 1,n , and combinations thereof; (f) storing said plurality of M 1,n by a processor and a memory storage device; (g) determining at least one calibration parameter of said first spherical coordinate measurement system based at least in part on said M 1,n ; and (h) storing said calibration parameter.