Title: Phase comparison radio navigation system receiver having phase memory oscillators for phase locking to time-sequentially received transmissions

Abstract: In a phase comparison radio navigation system in which spaced transmitters radiate phase-locked signals in a time-shared sequence, in order to enable a receiver to be operated on any selected one of a large number of different frequencies, a phase memory in the receiver for giving a continuous output representative of the phase of an intermittently received signal, comprises a controlled oscillator giving an output of a frequency much higher than the received frequency, a frequency divider providing a first sub-multiple of the oscillator frequency, a frequency synthesizer providing a heterodyne signal at a second sub-multiple and a phase comparator providing an output controlling the oscillator in accordance with the phase relation between the divider output and the output of a mixer mixing the received signal with a heterodyne signal.

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Inventors: Phipps, Derek John (London, EN)

Application Number: 524200
Filing Date: 1974-11-15
Publication_date: 1976-08-10
Assignee: Decca Limited (London, EN)
Primary Class(es): 342/397
Other Classes:
US Patent Ref:

3705403	Dec, 1972	Hughes	343/105.
3852751	Dec, 1974	Wood et al.	343/105.

Other Refs:
Primary Examiner: Wilbur, Maynard R.
Assistant Examiner: Berger, Richard E.
Attorney: Connors; Edward F.