Digital demodulation method and device for frequency modulation and amplitude modulation signals

A frequency modulation signal and amplitude modulation technology, which is applied to amplitude modulation oscillation demodulation components and other directions, and can solve the problems of low demodulation accuracy, inability to effectively obtain carrier model parameters, and resolution that cannot be lower than the carrier period.

Inactive Publication Date: 2012-09-12
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology

In the process of digital demodulation, the biggest difficulty lies in the time resolution of demodulation. Some demodulation methods, such as zero-crossing detection method to demodulate the frequency modulation signal, will encounter the problem that the resolution cannot be lower than the carrier period and will change with time. problem, the essential reason is that the algorithm cannot effectively obtain the model parameters of its carrier when the waveform is less than one cycle
Demodulation accuracy is low, distortion is large

Method used

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  • Digital demodulation method and device for frequency modulation and amplitude modulation signals
  • Digital demodulation method and device for frequency modulation and amplitude modulation signals
  • Digital demodulation method and device for frequency modulation and amplitude modulation signals

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Embodiment

[0048] A digital demodulation method for frequency modulation and amplitude modulation signals, the specific steps are:

[0049] 1) Perform signal conditioning on the frequency modulation signal or amplitude modulation signal to be tested, use the analog-to-digital conversion circuit to sample the conditioned signal, and convert the sampled waveform data sequence y i , i=1, 2,..., n is sent to the computer, wherein i represents the sampling point serial number in the synchronous sampling sequence;

[0050] The sequence length n and sampling rate v of the analog-to-digital conversion circuit acquisition waveform are set according to the carrier frequency of the measured modulation signal, and the setting principle is to ensure that there are more than 20 sampling points in each carrier waveform cycle;

[0051] 2) Firstly, at the leading edge of the waveform acquisition sequence, intercept less than one carrier period containing m 1 The waveform segment data sequence y of sampl...

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Abstract

The invention relates to a digital demodulation method and a digital demodulation device for frequency modulation and amplitude modulation signals, and belongs to the technical field of electronic measurement. The digital demodulation measurement of the frequency modulation and amplitude modulation signals is realized in a virtual instrument way, local area model parameter values such as amplitude and frequency of a sinusoidal carrier signal sequence are obtained by utilizing a partial waveform of less than a waveform cycle, and a sinusoidal model of less than a waveform cycle is subjected to sliding fitting on an actually-measured curve waveform, so that the digital demodulation of the modulation signals is realized. In addition, the method and the device have the characteristics of high temporal resolution, high robustness, small demodulation distortion, absolute convergence, rapid demodulation and the like. The method and the device are high in temporal resolution and robustness, an algorithm is absolutely convergent, and tracing and calibration are facilitated.

Description

technical field [0001] The invention relates to a digital demodulation method and device for frequency modulation signals and amplitude modulation signals, belonging to the technical field of electronic measurement. Background technique [0002] Modulation and demodulation technology is one of the basic radio technologies, widely used in radio, television, communications, navigation, measurement, testing, instruments, meters and other industries. [0003] The basic principle of amplitude modulation signal demodulation is to use peak detection hardware to achieve. One of the principles of frequency modulation signal demodulation is to use a frequency discriminator to convert frequency changes into amplitude changes, and then use peak detection methods to complete. It is characterized by good real-time demodulation and high speed, but the disadvantage is that the demodulation circuit is complex, there are many error link factors, the demodulation distortion is large, and the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D1/06
Inventor 梁志国张大鹏武腾飞朱振宇严家骅
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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