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Signal processing method and system

A signal processing and output signal technology, applied in the field of sensors, can solve the problems of light interference intensity and modulation depth affecting signal demodulation results, etc.

Inactive Publication Date: 2017-08-29
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the fluctuation of light interference intensity and modulation depth in the existing sensor technology affects the signal demodulation result, and to provide a signal processing method and system, which can solve the problems caused by light interference intensity and modulation depth Real-time rapid estimation of the amplitude factor of the output signal, and amplitude correction of the output signal to obtain a more accurate signal to be detected

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Embodiment Construction

[0025] Below by accompanying drawing and embodiment, technical scheme of the present invention is described in further detail.

[0026] figure 1 It is a schematic flowchart of a signal processing method provided by an embodiment of the present invention. Such as figure 1 As shown, the method includes steps 101-102:

[0027] Step 101: establish the function of the initial signal, and demodulate the initial signal according to the function of the initial signal, to obtain the function of the output signal, the function of the output signal includes an amplitude factor.

[0028] Specifically, the function of the initial signal is established, according to the function of the initial signal, the modulated signal is used to mix the initial signal, and the low-frequency signal function is obtained through low-pass filtering; the low-frequency signal function is calculated by the differential cross multiplication algorithm, and the first A calculation result; calculating the first...

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Abstract

The invention discloses a signal processing method and a system. The signal processing method comprises the steps of establishing an initial signal function, demodulating an initial signal according to the initial signal function, and acquiring an output signal function; wherein the output signal function comprises an amplitude factor; estimating the amplitude factor, and calculating the output signal function according to the estimation result of the amplitude factor, thereby acquiring a to-be-detected signal. The signal comprises a first processing module and a second processing module. The signal processing method and the system according to the invention can perform real-time quick estimation on the amplitude factor which is generated because of light interference strength and modulation depth, and furthermore performs amplitude correction on an output signal, thereby acquiring the more accurate to-be-detected signal.

Description

technical field [0001] The present invention relates to the technical field of sensors, in particular to a signal processing method and system. Background technique [0002] The phase-generated carrier (PGC) demodulation algorithm can be used to demodulate the interferometric fiber optic sensor signal. The PGC demodulation algorithm is divided into two types: differential-and-cross-multiplying (DCM for short) and arctangent (Arctan). The demodulation result of the DCM algorithm is affected by the light interference intensity and modulation depth. When the interference intensity and modulation depth fluctuate, the demodulation result will produce amplitude distortion. The arctangent algorithm can eliminate the influence of the interference intensity on the demodulation result by subtraction, but it is still affected by the modulation depth. When the modulation depth fluctuates, the demodulation result will be non-linear and cause serious harmonic distortion. [0003] For th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/69
CPCH04B10/6931H04B10/697
Inventor 崔杰刘亭亭肖灵
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI