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All-fiber pulse coherent Doppler laser wind measurement method and radar system

A Doppler laser and all-fiber technology, which is applied in the field of all-fiber pulse coherent Doppler wind lidar system, can solve the problem of reducing the wind speed measurement range of the radar system, reducing the signal-to-noise ratio of radar signals, and reducing the accuracy of wind speed measurement, etc. problem, achieve the effect of reducing the sampling rate of the AD card, reducing the amount of data storage, and increasing the range of wind speed measurement

Active Publication Date: 2017-02-01
CMA METEOROLOGICAL OBSERVATION CENT
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Problems solved by technology

However, under the same wind speed measurement range requirements, the required peak point sampling rate increases, which in turn increases the lidar's requirements for AD card sampling rate and system data storage capacity.
Under the same hardware conditions, especially the same sampling rate of the signal collector, the wind speed measurement range of the radar system is reduced, and the signal-to-noise ratio of the radar signal is also reduced, that is, the accuracy of wind speed measurement is reduced

Method used

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  • All-fiber pulse coherent Doppler laser wind measurement method and radar system
  • All-fiber pulse coherent Doppler laser wind measurement method and radar system
  • All-fiber pulse coherent Doppler laser wind measurement method and radar system

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Embodiment 1

[0057] refer to figure 1 , which shows a flow chart of an all-fiber pulsed coherent Doppler laser wind measurement method in Embodiment 1 of the present invention, which may specifically include:

[0058] In step 101, a 1*2 fiber coupler is used to divide the narrow-linewidth continuous laser light into local oscillator light and seed light.

[0059] In the embodiment of the present invention, the 1*2 fiber coupler is used to divide the narrow-linewidth continuous laser from one optical fiber into two optical fibers, wherein the optical signal in one optical fiber is called local oscillator light, and the optical signal in the other optical fiber The signal is called the seed light, and both the local oscillator light and the seed light can be expressed as:

[0060]

[0061] Among them, E l is the amplitude of the light, f 0 is the optical frequency, is the initial phase of light.

[0062] In step 102, the seed light is modulated into a pulse signal, and the frequency...

Embodiment 2

[0123] refer to figure 2 , which shows a schematic diagram of the optical path of an all-fiber pulsed coherent Doppler laser wind radar system according to Embodiment 2 of the present invention, refer to image 3 , showing the schematic diagram of the optical path of the 90-degree phase controller, which may specifically include:

[0124] Fiber seed laser, 1*2 fiber coupler, front acousto-optic frequency shifter, back-connected acousto-optic frequency shifter, erbium-doped fiber amplifier, circulator, and optical antenna are connected sequentially;

[0125] The 1*2 fiber coupler and the circulator are respectively connected to the 90-degree phase controller;

[0126] The 90-degree phase controller is connected with the first photodetector and the second photodetector;

[0127] The first photodetector and the second photodetector are respectively connected to the signal collector;

[0128] The signal collector is connected with the data processor;

[0129] Fiber seed laser...

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Abstract

The invention discloses an all-fiber pulse coherent Doppler laser wind measurement method and radar system wherein the method comprises the following steps. A signal light and a local oscillator are divided into two beams of identical signals respectively. One beam of the local oscillator signal keeps the initial phase unchanged, and the other beam of the local oscillator signal is shifted by 90 degrees from the initial phase. The two beams of the local oscillator signal with different phases experience beat frequency with the two beams of the signal light with the same phase. The two beams of the signal light are converted into electrical signals respectively. The electrical signals are converted further into digital signals. The digital signals experience rapid Fourier transform. Then, after the orthogonal processing, based on the frequency value and the positive and negative values of the imaginary part of the signal at the peak of the positive axis, the velocity value of the wind speed in the radial direction is calculated and the wind speed direction is determined in the radial direction. The system of the present invention realizes the improvement of the wind speed measurement range and the signal-to-noise ratio of a radar signal without increasing the signal sampling rate.

Description

technical field [0001] The invention relates to the technical field of wind-measuring lidar, in particular to an all-fiber pulse coherent Doppler laser wind-measuring method and an all-fiber pulse coherent Doppler wind-measuring lidar system. Background technique [0002] The wind lidar system uses the Doppler frequency shift effect of the backscattered signal to measure the atmospheric wind field by using the laser to collide with the moving aerosol particles in the atmosphere. At present, the coherent Doppler lidar used in atmospheric detection basically uses an acousto-optic frequency shifter. On the basis of the fundamental frequency of the emitted laser, an intermediate frequency signal is superimposed and then amplified and emitted into the atmosphere. The backscattered signal and the fundamental frequency of the emitted laser For the beat frequency of the signal, the radial wind speed and its direction are obtained according to the difference between the frequency val...

Claims

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Application Information

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IPC IPC(8): G01S17/95
CPCG01S17/95Y02A90/10
Inventor 高玉春陈玉宝
Owner CMA METEOROLOGICAL OBSERVATION CENT
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