Ambiguity free digital averaging phase meter

Details Ambiguity free digital averaging phase meter Ambiguity free digital averaging phase meter

1974-12-18

1977-01-04

Demeo, Palmer C.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Phase comparison

328155, G01R 2500

Patent

active

040016820

ABSTRACT:
The inherent phase ambiguity that results from the measurement of the phase difference between a reference signal and a data signal having a zero phase relationship is eliminated by adding 360.degree. to phase differences between 0.degree. and 180.degree.. Phase differences between 180.degree. and 360.degree. are measured in the conventional manner. Both the reference signal and the data signal are divided in frequency and the phase difference between the divided signals are compared. The data signal is inhibited for only 180.degree. of the original reference signal to prevent an initial comparing of phase differences between the data signal and the reference signals to establish the proper polarity relationship between the half rate data signal and the half rate reference signal.

REFERENCES:
patent: 3629715 (1971-12-01), Brown
patent: 3764903 (1973-10-01), Griswold
K. A. Steele, Application of Digital Integrated Circuits to Linear Phase Detection, Elec. Eng., May 1968.

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