METHOD OF MEASURING PHASE SHIFT Russian patent published in 2015 - IPC G01R25/00 

FIELD: radio engineering, communication.

SUBSTANCE: method comprises using to analogue-to-digital converters (ADC) and two distributors of signal readings into even and odd readings to generate third and fourth signals from first and second signals by delaying the first and second signals by a fixed time interval, all products of even and odd signals, the first value as the difference between the product of the first signal and the third signal and the first signal and the fourth signal, the second value as the sum of the product of the first signal and the second signal and the third signal and the fourth signal and an estimate of the phase shift between the first and second signals as the arctangent of the ratio of time-averaged first and second values; generating fifth and sixth signals by delaying the third and fourth signals by a fixed time interval; generating the third value as the difference between the product of the first signal and the fourth signal and the product of the second signal and the third signal, the fourth value as the difference between the product of the third signal and the sixth signal and the product of the fourth signal and the fifth signal, the fifth value as the difference between the product of the first signal and the sixth signal and the product of the second signal and the fifth signal, the sixth value as the sum of the product of the first signal and the sixth signal and the product of the fifth signal and the second signal, the seventh value as the sum of the product of the first signal and the second signal and the product of the fifth signal and the sixth signal, the eight value as the difference between the square of the third value and the sum of the squares of the first and second values; generating the first value as the product of the fifth value and the square-root of the difference between four times the product of squares of the third and fourth values and the square of the eighth value and the difference between two times the product of the third, fourth and seventh values and the product of the sixth and eighth values, and generating the second value as the square of the difference between two times the product of the third, fourth and seventh values and the product of the sixth and eighth values.

EFFECT: reduced error when measuring phase shift of quasi-harmonic signals with slow-varying amplitude and frequency in the presence of additive and multiplicative interference.

4 dwg, 1 tbl