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Frequency modulation amplitude measurement method and device for constant-frequency alternating-current power supply system

A technology of frequency modulation and power supply system, applied in the field of signal processing, it can solve problems such as difficulty in understanding and application by general engineers, low precision and slow calculation speed.

Active Publication Date: 2021-09-03
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Existing methods either have slow calculation speed and low precision; or are limited by the general error control of reconstructed signals; or have complex algorithms, which are difficult for ordinary engineers to understand and apply

Method used

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  • Frequency modulation amplitude measurement method and device for constant-frequency alternating-current power supply system
  • Frequency modulation amplitude measurement method and device for constant-frequency alternating-current power supply system
  • Frequency modulation amplitude measurement method and device for constant-frequency alternating-current power supply system

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Embodiment Construction

[0048] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0049] The method and device for measuring the frequency modulation amplitude of a constant-frequency AC power supply system according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0050] Firstly, a method for measuring frequency modulation amplitude of a constant-frequency AC power supply system according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0051] figure 1 It is a flowchart of a method for me...

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Abstract

The invention discloses a frequency modulation amplitude measurement method and device for a constant-frequency alternating-current power supply system, and the method comprises the steps: obtaining a moment and a sampling value of a to-be-demodulated signal at a zero crossing point, and constructing a value set according to the moment and the sampling value; constructing a time sequence containing time characteristics of the signal to be demodulated according to the value set; and performing fourier analysis on the time sequence to obtain the direct current component amplitude of the time sequence, and obtaining parameters of the to-be-demodulated signal according to the direct current component amplitude and the frequency and amplitude corresponding to the component with the maximum alternating current component amplitude of the to-be-demodulated signal. According to the method, the demodulation problem of the frequency modulation signal, namely the accurate acquisition problem of the frequency modulation amplitude, is solved. The method can be applied to wireless communication systems, broadcast televisions and various measurements based on the Doppler effect.

Description

technical field [0001] The invention relates to the technical field of signal processing, in particular to a method and device for measuring frequency modulation amplitude of a constant-frequency AC power supply system. Background technique [0002] For the current constant-frequency AC power supply system commonly used in civil aircraft, when connected to airborne equipment or subjected to electromagnetic interference, the voltage waveform generated by the power supply system is prone to modulation fluctuations. According to GJB181B-2012, the characteristic parameters related to signal modulation include voltage modulation amplitude, frequency modulation amplitude, and distortion spectrum generated by signal modulation. These parameters are often obtained by sampling the power supply waveform, and then processing and analyzing the sampled data. [0003] In order to obtain the frequency modulation amplitude, the voltage generated by the power supply system is regarded as th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02
CPCG01R23/02
Inventor 吴静张敬雯金海彬
Owner BEIHANG UNIV
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