Correction method for orientation parameters of workspace measurement positioning system

In order to ensure the field measuring accuracy of workspace measurement positioning system, the transmitter's orientation parameters should be corrected accordingly when its posture is altered by environmental factors such as temperature and vibration. Utilizing fixed receivers as references, a correction method for orientation parameters was proposed. Redundant receivers were installed on stable reference points in workspace to monitor the operation status of transmitters and perform real-time online correction on orientation parameters. Coordinate measurement equations of receivers were derived from transmitter's geometrical model described by optical plane parameters. On that basis, optimal equations for orientation parameter correction following coplanarity constraints were established while taking reference points' coordinates as known condition. The adjustment algorithm was given at the same time. Experimental results indicate that when 6 receivers are used for correction, system coordinate measuring deviation is within 0.15 mm, which meets the accuracy requirement of large scale coordinate measurement. The correction method shows effective improvement of the system reliability and applicability.