A Method for Obtaining Amplitude of Single Frequency Signal

Abstract

The invention relates to a method for acquiring the amplitude of a single-frequency signal, comprising the steps as follows: acquiring a sum sequence y(n) of a single-frequency signal x(n), wherein the sum sequence y(n) is obtained by continuously and sequentially calculating the sum of every M sample points of the single-frequency signal x(n), M=|p_max-p_min|, p_max is the position of the maximum value of the single-frequency signal x(n), and p_min is the position of the minimum value of the single-frequency signal x(n); calculating the peak value PK(y) of the sum sequence y(n) by using the maximum value max(y) and the minimum value min(y) of the sum sequence y(n), wherein PK(y)=[max(y)-min(y)] / 2; and calculating PK(y) / M, and adjusting the gain of PK(y) / M to obtain the amplitude of the single-frequency signal x(n). According to the invention, the amplitude of the single-frequency signal is obtained quickly by working out the difference between the maximum value and the minimum value after mean filtering. The method is simple and feasible, has low requirement on computation, is suitable for an occasion in which there is a need to obtain the amplitude of a single-frequency signal quickly, and is particularly suitable for an occasion in which all voltage are lost when the power grid suffers from power theft and the power metering unit is powered by a battery.

Description

technical field [0001] The present invention generally relates to the technical field of measurement, control and measurement of electronic signals, and specifically relates to a method for quickly calculating the amplitude of a single-frequency signal by using the difference of the maximum value after averaging filtering. The method provided by the invention is suitable for fast and high-precision realization of electric stealing detection and measurement in the grid field. Background technique [0002] Single-frequency signals, that is, single sine wave signals, are widely used in various fields that require electronic signals. For example, in the field of control, single-frequency signals are often used as input signals for system testing; in the field of power grids, single-frequency signals can be used to detect the stability of the grid power supply and the magnitude of the user's power consumption current. Therefore, it is of practical significance to quickly obtain ...

AI Technical Summary

Problems solved by technology

[0004] The advantage of the RMS method is that the data accuracy is high, and the effective value can be synthesized by measuring multiple frequencies, but the disadvantages are also obvious: the algorithm and processing process are complicated, and it takes a long time, which is not suitable for simple and fast applications.

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