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Multi-frequency component amplitude extraction method and system

An extraction method and multi-frequency technology, applied in the field of electrical engineering, can solve problems such as large hardware investment and inability to directly output polarization angles

Active Publication Date: 2020-12-11
HEFEI UNIV OF TECH +1
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Problems solved by technology

However, one phase-locking can only obtain the amplitude of one double-frequency component. One observation channel needs to be equipped with two phase-locking amplifiers. The hardware investment is large, and the polarization angle cannot be directly output.

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  • Multi-frequency component amplitude extraction method and system
  • Multi-frequency component amplitude extraction method and system
  • Multi-frequency component amplitude extraction method and system

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Embodiment Construction

[0034] In this embodiment, a multi-frequency component amplitude extraction method is implemented in an FPGA-based real-time signal processing system, and can simultaneously extract and analyze the amplitudes of multiple frequency components in the signal to be tested, and simultaneously extract two different frequency components. f 0 and f 1 When the magnitude of the component, such as figure 1 As shown, specifically, the steps are as follows:

[0035] Step 1: Perform fast Fourier transform of N points on the externally input PEM signal x(n) and obtain the spectrum Wherein K=0,1,2...,N-1, in specific implementation, take N as 4096;

[0036] Step 2: Use formula (1) to determine the frequency f on the spectrum X(k) respectively 0 The corresponding spectral line x(k 0 ) where the position k 0 and frequency f 1 The corresponding spectral line x(k 1 ) where the position k 1 :

[0037]

[0038] In formula (1), f 0 and f 1 is the double frequency of the PEM modulation ...

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Abstract

The invention discloses a multi-frequency component amplitude extraction method and system, and the method can extract and analyze the amplitudes of a plurality of frequency components in a to-be-detected signal at the same time, and comprises the steps: carrying out the fast Fourier transform of the sampled to-be-detected signal to obtain a signal frequency spectrum when the amplitudes of two different frequency f0 and f1 components are extracted at the same time; synchronously extracting local frequency spectrums of the two frequencies through frequency spectrum separation; performing inverse fast Fourier transform on the local frequency spectrum to obtain a cosine sequence Xcos(n)0 and a sine sequence Xsin(n)0 corresponding to the frequency f0 and a cosine sequence Xcos(n)1 and a sine sequence Xsin(n)1 corresponding to the frequency f1; performing summation processing on the square of the cosine sequence Xcos(n)0 and the square of the sine sequence Xsin(n)0 and then performing extraction to obtain the amplitude of the component corresponding to the frequency f0, and obtaining the amplitude of the component corresponding to the frequency f1 in the same way, so that the amplitudesof different frequency components in the to-be-detected signal can be accurately extracted in real time, and related quantity information of the amplitude can be calculated.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and specifically relates to a multi-frequency component amplitude extraction method and a system thereof. Background technique [0002] The current density distribution is one of the key distribution parameters for the EAST device to achieve long-pulse, high-performance plasma. At present, the diagnosis of current density distribution measurement is far-infrared laser polarization interferometer (FIRPOINT system) and motion Stark effect (MSE) diagnosis. MSE diagnosis obtains a reliable current density distribution by measuring the polarization direction of the Stark splitting spectrum generated by high-speed neutral particles passing through a strong magnetic field, combined with plasma balance inversion, which has good spatial locality, high precision, and fast time response. Advantages, it has been widely used in major devices in the world. [0003] At present, EAST has built a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J4/04
CPCG01J4/04Y02E10/50
Inventor 杨星河刘冬梅符佳吕波刘良成
Owner HEFEI UNIV OF TECH
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