Calibration of Doppler receivers

Calibration measurements of different Doppler receiver systems were performed in order to eliminate instrument differences between the phase centers of Doppler antennas. The measurements are quantitatively equivalent and show that the use of different instruments and antennas requires extensive verification and calibration of the phase center heights. If the phase center of the transportable Canadian Marconi (CMA) receiver 722B is taken as reference, a height correction of 1 m with respect to the factory specifications is necessary for the CMA 722B naval antenna and for the Magnarox 702A antennas.