SU928247A1 - Method of phase shift measurement - Google Patents

Description

(5) METHOD OF MEASURING SHIFT PHASE

I

The invention relates to a radio measurement technique and can be used to measure the phase shift of noisy electrical signals over a wide frequency range.

A known method for measuring the phase shift of electrical signals is that the phase shift between input signals is converted into a code using an intermediate conversion phase shift — a time inverter based on the polarity overlap of previously limited signals P.

The disadvantage of this method is the presence of a large systematic error due to exposure to noise.

There is also known a method for measuring the phase shift, which means that the measured signal is transformed by quadrature components, multiplied, integrated, calculated perineum, and the desired value of 2 is determined by the arc tangent value.

However, the known method has a significant error due to the influence of noise.

 invention - increased accuracy.

The purpose of the invention is to achieve TSMj that in the method of measuring the phase shift, which consists in converting the measured signal by the quadrature components, multiplying the components, accumulating and determining the ratio of their phase shift values, the measured signal is previously limited.

The drawing shows a device that implements a method for measuring the phase shift.

The device contains the following nodes: phase shifting unit 1, the first 2 and second 3 phase converters in the time interval, the first k and second 5 converters time interval - the code, the calculator phase shift 6 and the recording unit 7.

The device works as follows.

The input signal is applied to the first 2 phase converter in the time interval previously limited and after the shift by / g. in phase shifter 1, it enters the second 3 phase converter in the time interval. With the help of the first and second converters, the time interval is the code, the obtained time intervals are converted into codes. These codes are processed by the phase shift calculator 6, and the result is transmitted to the recording unit 7.

By introducing a limiting operation and using the calculation operation, the proposed method differs favorably from the known method, since the accuracy of measuring the phase shift of the electrical signals is significantly improved. For example, when measuring the phase shift with a signal-to-noise ratio of more than one, the error in multiplication and integration is 2- for the known method, while in the proposed method it is 0.03 or less. Such an increase in accuracy in combination with not very large complication, as well as

the possibility of being implemented entirely on integrated circuits, with the absence of expensive adjustment and tuning operations, allows us to significantly increase the scope of application of the proposed method for measuring the phase shift of electrical signals in various areas of national economy.

Claims (2)

1. Phase measuring systems and devices. Collection of works of Tomsk State University. Tomsk TSU, 197, p. 106-110. 2. Search, detection and measurement of signal parameters in radio navigation systems. Ed. Y.M. “Kazarinov. M., Soviet Radio, 1975, p. 237-239.