Title: Ground station for a VOR navigation system with means for identifying spurious responses at a remote VOR receiver

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Abstract: A ground station for VOR navigation systems with at least one transmitter and several radiators, which ground station radiates azimuth-dependent and azimuth-independent information. The azimuth-dependent information consists of the wave amplitude-modulated with 30 Hz in the field and generated by the superposition of the nondirectionally radiated VHF carrier on a VHF figure-8 directional pattern rotating at 30 Hz. The azimuth-independent reference wave consists of a 30-Hz wave which is contained as frequency modulated in a 9,960-Hz subcarrier wave amplitude-modulated on the VHF carrier. For the on-board identification of the simulated VOR signals radiated by the ground station and consisting of harmonics of the modulation frequencies of a VOR station transmitting on a first channel, the unmodulated carrier wave is amplitude-modulated, with the frequency of this modulation lying between the frequencies of the harmonics of the modulation frequency which occur at the limits of the bandwidth of the receiver set to a second channel adjacent to the first channel.


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