Sinusoidal signal frequency measurement method

A sinusoidal signal, frequency measurement technology, applied in the direction of frequency measurement device, spectrum analysis/Fourier analysis, etc.

CN111624400AActive Publication Date: 2020-09-04NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-09-04

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Abstract

The invention discloses a sinusoidal signal frequency measurement method. The method comprises the following steps: performing level data weighting on sinusoidal signal samples with the length of N; processing the weighted data by using rearrangement parameters sigma 0, sigma 1 and sigma 2, and reducing the data length from N points to N / M points on the premise of reserving effective harmonic components of a frequency domain to complete spectrum compression; sequentially carrying out N / M point FFT operation on three groups of data obtained by frequency spectrum compression, then, carrying outinter-group comparison on effective harmonic components contained in three groups of FFT results, and selecting two groups of FFT results with the closest harmonic component amplitudes to carry out module value and position estimation; and obtaining the sinusoidal signal frequency by using the obtained module value and position estimation. According to the sinusoidal signal frequency measurement method, the frequency of the measured signal can be accurately estimated; and the FFT calculation length is reduced through frequency spectrum compression, the frequency measurement range is wide, thenumber of calculation points of FFT is remarkably reduced, and the FFT calculation time delay and complexity are greatly reduced.
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Description

technical field

[0001] The invention relates to the technical field of frequency measurement, in particular to a method for measuring the frequency of a sinusoidal signal. Background technique

[0002] Sine signal frequency measurement is an important issue in the field of instrumentation, and it is widely used in carrier stability monitoring, physical quantity measurement, space science and other fields. The direct counting method is a common method for sinusoidal frequency measurement, and it is divided into frequency measurement method and period measurement method according to the difference of direct measurement quantity. The frequency measurement method measures the number of repetition cycles of the measured signal per unit time to convert it into signal frequency equivalently. In order to ensure the measurement accuracy, it is necessary to accumulate a sufficient number of repetition cycles. This makes the measurement time required by the frequency measurement metho...

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Embodiment Construction

[0074] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0075] The technical solutions provided by the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0076] The embodiment of the present invention provides a method for measuring the frequency of a sinusoidal signal, as shown in the attached figure 1 As shown, the method includes:

[0077] Perf...