Ngs antenna calibration files

Antenna Calibration. Current Research Project. Finished Research Projects. Topics of the Working Group. History of Antenna Calibration in Hannover. For GNSS antennas one of the uncertainties is created by the fact that they do not have a single fixed electrical reference point. The point of reception varies with the direction of the satellite signal being received and frequency of the GNSS signal. The introduced bias on the GNSS measurements will affect the position solution and can cause cm-level errors to position solutions.

To compensate for this, antenna calibrations are performed to model and map the signal phase advance and delays occurring at the antenna for each frequency according to the elevation and azimuths of the incoming signal source. In a relative calibration, all antenna phase center offsets PCO and phase center variations PCV are computed with respect to a reference antenna which is normally assigned zero PCV values.

While to conduct an absolute calibration, the antenna being tested is moved via a robot so that a particular satellite is received at different angles by the test and reference antennas. This angular separation enables cancellation of the reference antenna effects, leaving behind only the antenna offsets PCO and phase center variations PCV of the test antenna source.

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