Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1985-11-20
1987-03-03
Blum, Theodore M.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342442, 342357, G01S 504, G01S 502
Patent
active
046479350
ABSTRACT:
An apparatus for tracking phase discontinuities introduced into a received signal at known instants is disclosed. The phase discontinuities are introduced into the received signal by command signals derived from a system timing reference. A controlled oscillator generates an output signal at the same frequency as the received signal. The controlled oscillator introduces into the output signal a phase jump having a magnitude and timing determined by a control signal applied to its input. A synchronous detector responsive to phase jumps in the received signal generates the control signal so as to introduce a phase jump into the output signal at the known instants equal in magnitude and sign to the detected phase jumps. The controlled oscillator and synchronous detector constitute a delta phase tracking loop which is capable of tracking the discontinuities in phase. The apparatus can be used to derive orientational information from a radio signal transmitted from a source whose position is known or can be determined.
REFERENCES:
patent: 3725937 (1973-04-01), Schreiber
patent: 4472720 (1984-09-01), Reesor
Blum Theodore M.
Cain D. C.
Starnav Corporation
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