Dvor monitor device, and dvor monitor method
AssigneeKabushiki Kaisha Toshiba
InventorHiroki Kihara
Life of this patent
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Abstract
A monitor antenna receives radio waves transmitted from a Doppler very high frequency omnidirectional radio range (DVOR) device and includes a carrier signal and a subcarrier signal, orthogonal detectors shift a phase of a signal of each subcarrier component by a phase difference equivalent to a prescribed distance away from the DVOR apparatus relative to a signal of a carrier component, and a combiner combines signals of the carrier component and the subcarrier component to output the combined signal to a DVOR demodulator.
Claims5
A Doppler very high frequency omnidirectional range (DVOR) monitoring apparatus, comprising:
- a receiver which receives radio waves from a DVOR apparatus, the radio waves including a modulated carrier and a modulated subcarrier;
- a first signal extractor which extracts a signal of a carrier component from a reception signal obtained by the receiver;
- a second signal extractor which extracts a signal of a subcarrier component from the reception signal obtained by the receiver and shifts a phase of the signal of the subcarrier component by a phase difference equivalent to a prescribed distance away from the DVOR apparatus relative to the signal of the carrier component;
- a combiner which combines each output from the first and the second signal extractors;
- a demodulator which demodulates an output signal from the combiner;
- and
- a monitor unit which performs operation confirmation of the DVOR apparatus based on the signal obtained by the demodulator.
A Doppler very high frequency omnidirectional range (DVOR) monitoring apparatus comprising:
- a receiver which receives radio waves from a DVOR apparatus, the radio waves including a modulated carrier and a modulated subcarrier;
- a first signal extractor which extracts a signal of a carrier component from a reception signal obtained by the receiver;
- a second signal extractor which extracts a signal of a subcarrier component from the reception signal obtained by the receiver and advances a phase of the signal of the subcarrier component by a phase difference equivalent to a prescribed distance away from the DVOR apparatus relative to the signal of the carrier component;
- a third signal extractor which extracts the signal of the subcarrier component from the reception signal obtained by the receiver, and delays the phase of the signal of the subcarrier component by the phase difference equivalent to the prescribed distance from the DVOR apparatus relative to the signal of the carrier component;
- a combiner which combines each output from the first, the second and the third signal extractors;
- a demodulator which demodulates an output signal from the combiner;
- and
- a monitor unit which performs operation confirmation of the DVOR apparatus based on the signal obtained by the demodulator.
A Doppler very high frequency omnidirectional radio range (DVOR) monitor method which receives radio waves including a modulated carrier and a modulated subcarrier from a DVOR apparatus, and performs operation confirmation of the DVOR apparatus from a signal obtained by demodulating the reception signal by a demodulator, comprising:
- extracting a signal of a carrier component and a signal of a subcarrier component from radio waves arrived from the DVOR apparatus,
- giving a phase difference equivalent to a prescribed distance away from the DVOR apparatus to each of the signals, and
- combining the signals of the carrier component and the subcarrier component to output the combined signal to the demodulator.
Dependencies are inferred from the claim text.