Digital VOR bearing measurement apparatus

摘要

A VOR bearing measurement scheme wherein the received 30 hertz reference signal is delayed a fixed time to produce an approximately 90 degree phase shifted reference signal. The reference is multiplied by the phase shifted, itself and the variable signals to produce first, second and fourth signals. The variable signal is then multiplied by the phase shifted signal to produce the third signal. The bearing is then indicative of the ratio of filtered third and fourth signals less the ratio of filtered first and second signals.