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Method and device for digitally demodulating phase generated carrier by adopting analog front end

A phase-generated carrier wave and analog front-end technology, applied in digital transmission systems, modulated carrier systems, electromagnetic wave transmission systems, etc., can solve problems such as low dynamic range, long response time, and high algorithm complexity

Active Publication Date: 2017-06-13
JILIN UNIV
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Problems solved by technology

[0005] The present invention aims at the problems of long response time, low dynamic range and high algorithm complexity existing in the traditional digital demodulation method, and at the same time avoids the extra noise caused by the full analog demodulation, and proposes a digital phase-generated carrier (PGC) using an analog front-end ) demodulation method and device

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  • Method and device for digitally demodulating phase generated carrier by adopting analog front end
  • Method and device for digitally demodulating phase generated carrier by adopting analog front end

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Embodiment Construction

[0090] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0091] Such as figure 1 As shown, a digital phase-generated carrier (PGC) demodulation device using an analog front-end is composed of analog demodulation, digital compensation and digital demodulation modules.

[0092] The analog demodulation module includes a dual-channel mixer and a 6-order Bessel low-pass filter, and the mixer of each channel is connected to the 6-order Bessel low-pass filter in sequence. The input of the analog demodulation includes the interference signal, the double frequency carrier and the double frequency carrier, and the output of the analog demodulation module is connected to the input of the digital compensation.

[0093] The offset compensation unit of the digital compensation module is used to adjust the DC offset of the two digital signals and eliminate the offset introduced by analog demodulation; figure 2 As shown, ...

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Abstract

The invention discloses a method and device for digitally demodulating a phase generated carrier by adopting analog front end. The device is characterized by consisting of analog demodulation, digital compensation and digital demodulation modules. The method comprises four steps of frequency mixing of an interference signal with a primary-frequency carrier signal and a doubled-frequency carrier signal respectively and carrying out of low-pass filtering, digital compensation, elimination of random phase fading, reduction of a detected signal, and the like. Compared with an existing digital demodulation method, the method can be used for obviously reducing a demodulation response time; a frequency mixing algorithm and a low-pass filtering algorithm in the existing digital demodulation are removed; the algorithm complexity is decreased; the demodulation precision is improved; the problem that a dynamic range is limited by the existing digital demodulation method is solved.

Description

technical field [0001] The invention belongs to the field of phase generation carrier demodulation. Background technique [0002] The interferometric optical fiber sensing system measures the measured object by detecting the phase change of the optical signal propagating in the optical fiber, so the phase demodulation method is very important. At present, the commonly used methods mainly include active homodyne demodulation, synthetic heterodyne demodulation, pseudo heterodyne demodulation and phase generated carrier (PGC) demodulation. [0003] The phase-generated carrier (PGC) demodulation method uses an unbalanced interferometer to introduce a large-amplitude phase-modulated signal of a fixed frequency away from the frequency band of the signal to be measured by high-frequency modulation on the frequency of the optical signal. The measured signal becomes the sideband of the modulated signal, and then the measured signal output by the interferometer and the low-frequency ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/548H04B10/556H04L27/00
CPCH04B10/548H04B10/5561H04L27/0002
Inventor 常天英王忠民崔洪亮陈建冬高文智
Owner JILIN UNIV
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