RESTRICTION ON THE ARRANGEMENT OF LASER TRACKERS IN LASER TRILATERATION

Laser trilateration is an effective technique for measuring three-dime nsional coordinates. Taking advantage of a fourth laser tracker, the p ositions of all four laser trackers can be determined by a self-calibr ation algorithm. We show a restriction on the arrangement of laser tra ckers, namely, no tracker must exist on the plane defined by the other three trackers. A method of evaluating the measurement results is als o discussed.