Radio beacon phase modulator

Details Radio beacon phase modulator Radio beacon phase modulator

1993-05-12

1995-08-29

Issing, Gregory C.

Communications: directive radio wave systems and devices (e.g.,

Directive

Beacon or receiver

342386, 375280, 332144, G01S 100, G01S 108, H03H 900, H04L 2710

Patent

active

054464668

ABSTRACT:
A phase modulator for a position indicating radio beacon which includes a digital memory circuit having a plurality of sets of stored numerical amplitude values with each set corresponding to a sine wave of a given phase and with at least three values in each set. A selection circuit selects phase values from the memory circuit in steps between a predetermined angular range in response to input data and, for each phase value, transfers the set of amplitude values in series at spaced apart time intervals to a digital to analog converter. A high frequency filter has an input coupled to an output of the digital to analog converter such that a sine wave is produced at an output of the high frequency filter.

REFERENCES:
patent: 3935386 (1976-01-01), Glasson et al.
patent: 4179672 (1979-12-01), Voles

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