Calibrator for distance measuring equipment

摘要

In distance measuring equipment apparatus which includes an antenna; a transmitter/receiver coupled to the antenna to transmit interrogation pulses and receive responses from a ground station, the pulses being spaced apart, the ground station also transmitting other responses between the responses; and a data processor receiving video and gate signals from the transmitter/receiver and calculating therefrom the distance to the ground station in order to calibrate for receiver and installation delays. The receiving signal, other than when one of the responses is being received, is modulated. The phase of the resulting modulation on the video signal with respect to the phase of modulation at the modulator is detected to determine the receiver and installation delay.