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Speed measurement method and system applied to laser Doppler velocimeter

A Doppler velocimeter and velocity measurement technology, used in radio wave measurement systems, measurement devices, instruments, etc., can solve problems such as low detection accuracy, and achieve the effect of narrowing the search range, high time resolution, and improving real-time performance.

Pending Publication Date: 2022-04-12
QINGDAO NAT LAB FOR MARINE SCI & TECH DEV CENT +1
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  • Claims
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Problems solved by technology

[0004] Aiming at the technical problem that the laser Doppler velocimeter adopts a single window length for the low time-frequency detection accuracy of the non-stationary signal, the present invention proposes a speed measurement method and system applied to the laser Doppler velocimeter

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  • Speed measurement method and system applied to laser Doppler velocimeter
  • Speed measurement method and system applied to laser Doppler velocimeter
  • Speed measurement method and system applied to laser Doppler velocimeter

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Embodiment 1

[0059] figure 1 A step of a speed measuring method applied to a laser Doppler speed assembly provided by the present invention. Such as figure 1 As shown, this embodiment discloses a specific embodiment of a speed measuring method (hereinafter referred to as "method") applied to the laser Doppler speedometer.

[0060] Wavelet Trasform, WT is an adaptive time-frequency analysis method. Its main feature is to have a good localized property at both time and frequency, and the signal gradually performs multi-scale refinement through the telescopic translation. Focus on the sum of the signals, multi-resolution analysis can be performed, and the time-frequency analysis processing of the non-stationary signal is more effective. However, due to the large amount of calculation using wavelet transform, it is not conducive to the real-time performance of system signal processing and analysis. Therefore, the present invention utilizes a method of combining a wavelet transform and a fast Four...

Embodiment 2

[0118] In conjunction with the speed measurement method of the laser Doppler speed, the present embodiment discloses a specific measurement system (hereinafter referred to as "system") applied to the laser Doppler speed. Implement example.

[0119] Refer Figure 7 As shown, the system includes:

[0120] The data acquisition unit 11: collects the motion signal of the measured object by the laser Doppler speedometer, and performs parameter setting according to the motion signal;

[0121] Data Section Unit 12: Filter processing and segmentation according to the set parameters, and segments the starting segment as the current paragraph;

[0122] Fast Fourier Transform Unit 13: Transfer the signal in the current paragraph to the frequency domain through the fast Fourier transform to the frequency domain and perform spectrum analysis, and obtain the frequency search range of the signal in the current paragraph;

[0123] Specifically, the rapid Fourier transform unit 13 includes:

[0124]...

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Abstract

The invention discloses a speed measurement method and system applied to a laser Doppler velocimeter, and the method comprises the steps: collecting a motion signal of a measured object through the laser Doppler velocimeter, and carrying out the parameter setting according to the motion signal; filtering and segmenting the motion signal according to the set parameters, converting the signal of each segment into a frequency domain through fast Fourier transform, and performing spectral analysis to obtain a frequency search range of the signal of each segment; performing wavelet transform on the signals in the paragraphs through the set parameters and the frequency search range, and obtaining an instantaneous frequency estimation curve fragment of each paragraph signal by extracting a wavelet ridge line; and splicing the instantaneous frequency estimation curve segments of each paragraph, and reconstructing a time-frequency signal to obtain a speed-time curve of the measured object. According to the invention, wavelet transform is utilized to process signals, and the time resolution and data processing speed of the system are effectively improved by combining fast Fourier transform.

Description

Technical field [0001] The present invention relates to the field of speed and acceleration measurement, and more particularly to a speed measurement method and system applicable to a laser Doppler speedometer. Background technique [0002] The laser Doppler measurement technique is to be laser as an information carrier, and a bundle laser is irradiated onto the moving target object, by detecting the frequency offset of its scattered light relative to the incident light, i.e., Doppler frequency shift, and utilizing data processing method. Get the moving speed information of the target object. The laser Doppler speed technology has the advantages of non-contact measurement, non-interference target motion, high spatial resolution, high measurement accuracy, and large number of ranges, has been widely used in military, aviation, aerospace, machinery and other industries. [0003] The Fourier transform algorithm is currently commonly used frequency domain detection method, but the Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/58G06F17/14
Inventor 杨雅涵吴国俊郝歌扬焉兆超杨钰城
Owner QINGDAO NAT LAB FOR MARINE SCI & TECH DEV CENT
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