Relative calibration calculates all antenna offsets (PCO) and phase center variations (PCV) with respect to a reference antenna, which usually has zero PCV values. For NGS relative calibrations, the reference antenna is the Dorne-Margolin choke ring antenna, type T (AOAD/M_T). A relative calibration is biased by the phase advance/delay experienced by the reference antenna.
Note: Relative antenna offset must be enabled for all systems that run 3D-MC v12 or v13 on the MC-X platform. For all systems that run 3D-MC v15, the relative antenna offset must be disabled.
In an absolute calibration, all antenna offsets and phase center variations are independent of the reference antenna. To do an absolute calibration, a robot moves the antenna under calibration to receive a particular satellite signal at different angles by the test and reference antennas. This angular separation enables the cancellation of the reference antenna effects, which leaves only the test antenna offsets and phase center variations.
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