CN113671532A - Self-adaptive multi-channel wind lidar system - Google Patents
Self-adaptive multi-channel wind lidar system Download PDFInfo
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- CN113671532A CN113671532A CN202110913297.0A CN202110913297A CN113671532A CN 113671532 A CN113671532 A CN 113671532A CN 202110913297 A CN202110913297 A CN 202110913297A CN 113671532 A CN113671532 A CN 113671532A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/4802—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/484—Transmitters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
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Abstract
The invention provides a self-adaptive multi-channel wind lidar system which comprises a tunable semiconductor laser, an acousto-optic modulator, an EYDFA amplifier, an optical fiber circulator, a DWDM wavelength division multiplexer, a photoelectric detector, a signal processing module and an attitude sensing module, wherein the tunable semiconductor laser is connected with the acousto-optic modulator; the tunable semiconductor laser outputs continuous signals to the acousto-optic modulator; the acousto-optic modulator is used for carrying out optical pulse modulation processing and then transmitting the optical pulse modulation processing to the EYDFA amplifier, wherein signals enter through a port 1 of the optical fiber circulator, and enter into the DWDM wavelength division multiplexer from a port 2; the DWDM wavelength division multiplexer sends out echo signals which enter from a port 2 of the optical fiber circulator and exit from a port 3 of the optical fiber circulator and are transmitted to the photoelectric detector, and then the signals are transmitted to the signal processing module, and the gesture sensing module is used for outputting the signals of the final motion state change. The system can automatically adjust the channel switching rate by combining real-time wind condition and attitude sensing, thereby maximally utilizing system resources and realizing high-precision wind measurement as required.
Description
Technical Field
The invention belongs to the technical field of laser radars, and particularly relates to a self-adaptive multi-channel wind-finding laser radar system.
Background
The atmospheric wind field information is an important parameter of the atmosphere and plays an important role in the fields of civil aviation, meteorology and wind power. Wind field detection facilitates the study of weather events, climate change and environmental issues. The wind measurement laser radar mainly uses the aerosol backscattering signal and the local oscillator light of the radar as beat frequency through the Doppler effect to obtain the Doppler frequency shift of the scattering signal, so that the wind speed information is obtained.
The inversion of the three-dimensional wind field requires radial wind speed measurement values in at least three directions, and the laser radar realizes measurement in multiple directions through light beam scanning. For flat terrain, the wind field is uniformly distributed, and low-speed scanning is beneficial to pulse accumulation and improves the detection range; for complex terrain, the wind field changes rapidly, and in order to achieve measurements of transient gusts and turbulence, the beam scanning speed is required to be as fast as possible. In addition, when the radar is applied to a moving platform, such as a vehicle and a buoy, the change of the attitude also puts a dynamic change requirement on the scanning speed of the light beam.
The existing laser radar system has two light beam scanning modes: optical switch switching mode and mechanical scanning mode.
The optical switch switching modes can be divided into two types: 1. magneto-optical switch, 2.MEMS switch. The magneto-optical switch has high requirements on the environment, and the MEMS switch has fussy control and low reliability.
The mechanical scanning mode has the problems of large volume, complex installation, low reliability and the like, and a controller needs to be additionally installed independently.
Neither of the above two methods can meet the requirement of adaptive switching scanning rate. According to the influence of various complex terrains of the use environment or the factors of the motion state of an object, the radar detection is required to change the detection rate at any time, and the three optical switches cannot be realized.
Disclosure of Invention
The technical scheme is as follows: in order to solve the technical problem, the invention provides a self-adaptive multi-channel wind-finding laser radar system, in particular to a system
The device comprises a tunable semiconductor laser, an acousto-optic modulator, an EYDFA amplifier, an optical fiber circulator, a DWDM wavelength division multiplexer, a photoelectric detector, a signal processing module and an attitude sensing module; the tunable semiconductor laser outputs continuous signals to the acousto-optic modulator; the acousto-optic modulator is used for carrying out optical pulse modulation processing and transmitting a signal to the EYDFA amplifier; the EYDFA amplifier is used for amplifying light energy of signals and transmitting the signals to the optical fiber circulator, the optical fiber circulator is of a multi-port structure, signals of the EYDFA amplifier enter the optical fiber circulator through a port 1, and signals of a port 2 enter the DWDM through a port 2; the DWDM wavelength division multiplexer sends out echo signals which enter from a port 2 of the optical fiber circulator and exit from a port 3 of the optical fiber circulator and are transmitted to the photoelectric detector; the photoelectric detector is used for performing beat frequency processing on the echo signal and local oscillation light of the tunable semiconductor laser, transmitting the processed signal to the signal processing module for processing, and the attitude sensing module is used for outputting a signal of the final object with the motion state change.
As an improvement, the wind parameter reconstruction module is further included; the wind parameter reconstruction module is used for outputting various parameters of wind and loading the parameters in the signal processing module.
The system comprises a tunable semiconductor laser, an attitude sensing module, a signal processing module and a frequency changer, wherein the tunable semiconductor laser is used for converting wind into turbulent wind or transient gust, and the attitude sensing module is used for sensing the wind speed and the wind speed of the wind turbine.
As an improvement, the tunable semiconductor laser comprises two spaced sets of sampled gratings, a gain section and a phase section, wherein the gain section and the phase section are disposed between the two sets of sampled light.
As an improvement, the acousto-optic modulator is provided with at least one group, which comprises an acousto-optic device, an optical fiber coupling system and a driver, and is used for modulating the driving electric signal according to different extinction ratios, so that the on-off control of the optical signal can be realized.
As an improvement, the wind parameter reconstruction module is used for outputting wind state parameters including but not limited to wind direction, wind speed and turbulence, wherein the radial wind speed is expressed as
As an improvement, when scanning for two-channel anemometry, setting a wind vector
According to the geometrical relationship:
the plane wind speed and the plane wind direction of the light beam are respectively as follows:
the turbulence is:
wherein T is the length of the time sliding window,
the mean value of radial wind speed in T time, los is 1,2 is the beam number, sigmaTTo sum the data at time T.
As an improvement, the frequency changer sets the threshold value of each area according to the feedback information of signal processing, when the threshold value is reached, the frequency changer starts to act, and the change frequency directly feeds back the uITLA for adjusting the conversion rate.
As an improvement, the attitude sensing module performs corresponding monitoring according to the motion frequency of an object mounted on the radar, and performs corresponding compensation processing for the frequency of the synchronous radar, wherein during specific compensation, when V is equal to Z and is equal to 0, the default object is stationary, and when V is greater than Z, a corresponding frequency is output to perform compensation processing on the frequency of the utila. Wherein, the uotla refers to a tunable semiconductor laser; v refers to the frequency of motion of the mounted radar object; z refers to radar frequency.
Has the advantages that: the radar system provided by the invention can automatically adjust the channel switching rate by combining real-time wind condition and attitude sensing, thereby maximally utilizing system resources and realizing high-precision wind measurement as required. The adjustable laser adopted by the system is simple to control, high in switching frequency, long in service life and good in reliability; the DWDM technology is mature, the cost is low, external signal control is not needed, and signals are output in multiple paths; the signal processing module processes needed data in time and distributes the data to a lower level; the wind parameter reconstruction module can clearly know the current wind state; attitude sensing and frequency change can change corresponding parameters according to the real-time wind speed state, so that the effect of improving the performance of the radar is achieved.
Drawings
Fig. 1 is a schematic view of a radar system according to the present invention.
Fig. 2 is a schematic diagram of the components of the tunable semiconductor laser of the present invention.
FIG. 3 is a schematic diagram of the pulse signal modulation waveform of the acousto-optic modulator of the present invention.
Fig. 4 shows the working principle of the DWDM wavelength division multiplexer according to the present invention.
In the figure: the device comprises a tunable semiconductor laser 1, an acousto-optic modulator 2, an EYDFA amplifier 3, a fiber circulator 4, a DWDM wavelength division multiplexer 5, a photoelectric detector 6, a signal processing module 7, a wind parameter reconstruction module 8, a frequency changer 9 and an attitude sensing module 10.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1, in the adaptive multi-channel wind lidar system of the present invention, a tunable semiconductor laser 1 outputs continuous signal light after wavelength adjustment, is connected with an acousto-optic modulator 2 for optical pulse modulation, is connected with an EYDFA amplifier 3 for optical energy amplification, passes through an optical fiber circulator 4, enters from a port 1 into a port 2, enters into a DWDM wavelength division multiplexer 5 for light splitting, so that laser with different wavelengths enters into a telescope through different channels to emit to the atmosphere, echo signals scattered by the atmosphere are received through the same emitting port, and enter into a photodetector 6 after passing through the ports 4 and 3 of the optical fiber circulator 4 and 2, the echo signals and local oscillation light of the tunable semiconductor laser 1 carry out beat frequency, the signals after beat frequency enter into a device 7 for data processing, various parameters of the air output by an air parameter reconstruction module 8, a frequency changer 9 finds turbulence or transient air matrix state after data processing of the signal processing module 7, the speed needs to be adjusted, the speed is fed back to the device 1 to change the frequency, and the attitude sensing module 10 feeds back the change of the motion state of the mounted object to the tunable semiconductor laser 1 to change the frequency.
The components of the radar system of the present invention are further described and illustrated in detail below.
The tunable semiconductor laser 1, as shown in fig. 2, adopts a tunable seed source and has the working principle: the laser has a sampling grating as a reflection grating at each of two ends of the resonant cavity. The grating spacing of the two sampled gratings is designed to be slightly different. The resulting spectra will have different mode spacing. Resonant amplification of the light is only possible if the modes are at the same time on both fiber reflection peaks. The reflection spectrum of one of the gratings is shifted by changing the injected current, so that the coincidence position of the reflection peaks is changed, and output light with different frequencies is obtained. Similarly, a first-stage phase region is arranged in the middle and also serves as a fine adjustment region, quasi-continuous wavelength adjustment is realized by changing oscillation positions of modes through the fine adjustment region, the range can reach hundreds of nanometers, and the selected wavelength is finer.
Sampling grating section: injection current IDER1，2Changing the reflection peak, coarse tuning the wavelength
Phase section: injection current Ip, shifted longitudinal mode spectrum, fine wavelength tuning
A gain section: injecting a current I to provide a gain
The wind speed precision is influenced by the wavelength precision due to the correlation of the wind speed and the wavelength in the wind speed inversion.
The acousto-optic modulator 2 is used for modulating waveform, and the invention adopts a fiber acousto-optic modulator which mainly comprises an acousto-optic device, a fiber coupling system and a driver. In the system, a single or multiple acousto-optic modulators can be used for modulation, and switching control of optical signals can be realized by modulating driving electric signals according to different system extinction ratios in a matching manner as shown in fig. 3.
The EYDFA amplifier 3 is based on a double-cladding optical fiber pumping MOPA amplification technology, after pumping light and signals enter a double-cladding gain optical fiber at the same time, low-level particles rise to a high level and finally return to a ground state stably, the original signal light is amplified by reversing the number of the particles, and a multi-stage amplification structure can be realized.
The optical fibre circulator 4 enables bidirectional signal transmission over a single optical fibre, the direction of signal transmission of the circulator being irreversible, and optical signals being directed from one port to another port only in one direction at a time, the optical signals being re-directable but having to pass through the ports in sequence in one direction. A three-port, i.e., three-port, circulator optical signal in the present invention must travel from port 1 to port 2 and then to port 3.
As shown in fig. 4, the DWDM wavelength division multiplexer 5 is actually integrated like a plurality of WDM devices. After passing through DWDM, multiple wavelengths pass through multimode fiber, and laser with different wavelengths is separated by the WDM. Coupling a plurality of wavelength composite lasers modulated by the DBR tunable seed source laser to a DWDM optical device through optical fibers, refracting the light into each optical fiber array through a prism, placing a filter of a dielectric film at the front end of each optical fiber array, and transmitting the light into the optical fibers through the filter only if the wavelength of the light is within the filtering range; if not, the filter plate which can not pass through the wavelength can be reflected back by the filter plate, at the moment, a layer of reflection film is plated on the edge of the module, the light reflected back by the first filter plate is reflected to the port of the next optical fiber array again, and the filter plates with different wavelengths are placed at the next port. The method is used for realizing the optical switching by sequentially and repeatedly acting, finding out the proper wavelength through the back-and-forth reflection of different filters and reflectors, and then enabling the light to enter the corresponding port of the optical fiber array, so that most wavelengths in the multimode optical fiber are decomposed into a single wavelength and output from different wavelength channels. Because the optical switch module in the radar system needs low insertion loss, high return loss, high withstand power and high reliability, the DWDM key parameters can well meet the requirements.
The photodetector 6 converts the received optical signal into an electrical signal, and outputs the electrical signal after internal amplification.
The signal processing module 7 is used for carrying out algorithm processing on the received electric signals and connecting the electric signals to an upper computer in a communication mode.
As shown in fig. 5, the wind parameter reconstruction module 8 converts the processed signal according to the doppler shift principle and the trigonometric geometric relationship, and outputs the wind state, such as wind direction, wind speed, and turbulence.
The radial wind velocity is expressed as:
When the two-channel wind measurement scanning is carried out, the return light is received, the processing calculation is carried out, and the wind vector is set
According to the geometrical relationship:
the plane wind speed and the plane wind direction of the light beam are respectively as follows:
the turbulence is:
wherein T is the length of the time sliding window,
the mean value of radial wind speed in T time, los is 1,2 is the beam number, sigmaTTo sum the data at time T.
The working principle of the frequency changer 9 is as follows: according to the feedback information of signal processing, threshold values of all areas are set, when the threshold values reach a certain threshold value, the threshold values start to act, and the change frequency is directly fed back to the uITLA to adjust the conversion rate.
When Ti is presentlosWhen the frequency is less than or equal to P, measuring at a conventional frequency; when Ti is presentlosWhen the gradient is larger than or equal to P, the frequency is changed along with the change of the gradient. As shown in FIG. 6, after data processing, TilosWhen the threshold value is not less than A, B, C.
The working principle of the posture sensing module 10 is as follows: the processing method is as shown in fig. 7, when V ═ Z ═ 0, the default object is still, and when V > Z, a corresponding frequency is output to compensate the frequency of the utila. Where uotla refers to a tunable semiconductor laser; v refers to the frequency of motion of the mounted radar object; z refers to radar frequency.
The self-adaptive multi-channel wind lidar disclosed by the invention can automatically adjust the channel switching rate by combining real-time wind condition and attitude sensing, thereby maximally utilizing system resources and realizing high-precision wind measurement as required. The adjustable laser adopted by the system is simple to control, high in switching frequency, long in service life and good in reliability; the DWDM technology is mature, the cost is low, external signal control is not needed, and signals are output in multiple paths; the signal processing module processes needed data in time and distributes the data to a lower level; the wind parameter reconstruction module can clearly know the current wind state; attitude sensing and frequency change can change corresponding parameters according to the real-time wind speed state, so that the effect of improving the performance of the radar is achieved.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. The utility model provides a self-adaptation multichannel anemometry lidar system which characterized in that: the device comprises a tunable semiconductor laser (1), an acousto-optic modulator (2), an EYDFA amplifier (3), an optical fiber circulator (4), a DWDM wavelength division multiplexer (5), a photoelectric detector (6), a signal processing module (7) and an attitude sensing module (10); the tunable semiconductor laser (1) outputs continuous signals to the acousto-optic modulator (2); the acousto-optic modulator (2) is used for carrying out optical pulse modulation processing and transmitting a signal to the EYDFA amplifier (3); the EYDFA amplifier (3) is used for amplifying light energy of signals and transmitting the signals to the optical fiber circulator (4), the optical fiber circulator (4) is of a multi-port structure, signals of the EYDFA amplifier (3) enter through a port 1 of the optical fiber circulator (4), and signals of a port 2 enter into a DWDM wavelength division multiplexer (5); the DWDM wavelength division multiplexer (5) sends echo signals to enter from a port 2 and exit from a port 3 of the optical fiber circulator (4) and transmits the echo signals to the photoelectric detector (6); the photoelectric detector (6) is used for performing beat frequency processing on echo signals and local oscillator light of the tunable semiconductor laser (1), the processed signals are transmitted to the signal processing module (7) to be processed, and the attitude sensing module (10) is used for outputting signals of the final object motion state change.
2. The adaptive multi-channel wind lidar system of claim 1, wherein: the wind parameter reconstruction module (8) is further included; the wind parameter reconstruction module (8) is used for outputting various parameters of wind and loading the parameters in the signal processing module (7).
3. The adaptive multi-channel wind lidar system of claim 1, wherein: the device also comprises a frequency changer (9) which is used for obtaining a speed parameter to be adjusted in a turbulent flow or transient gust transition state through data processing of the signal processing module (7) and carrying out information interaction with the tunable semiconductor laser (1) and the attitude sensing module (10).
4. The adaptive multi-channel wind lidar system of claim 1, wherein: the tunable semiconductor laser (1) comprises two groups of sampling gratings, a gain area and a phase area which are spaced, wherein the gain area and the phase area are arranged between the two groups of sampling light.
5. The adaptive multi-channel wind lidar system of claim 1, wherein: the acousto-optic modulator (2) is provided with at least one group, comprises an acousto-optic device, an optical fiber coupling system and a driver, and is used for modulating a driving electric signal according to different extinction ratios in a matched mode, and on-off control of the optical signal can be achieved.
6. The adaptive multi-channel wind lidar system of claim 2, wherein: the wind parameter reconstruction module (8) is used for outputting wind state parameters including but not limited to wind direction, wind speed and turbulence, wherein the radial wind speed is expressed as
f0The amount of frequency shift, f, of the device 2 is the received scattered return light.
7. The adaptive multi-channel wind lidar system of claim 6, wherein: setting wind vector when scanning for two-channel wind measurement
According to the geometrical relationship:
the plane wind speed and the plane wind direction of the light beam are respectively as follows:
the turbulence is:
wherein T is the length of the time sliding window,
the mean value of radial wind speed in T time, los is 1,2 is the beam number, sigmaTTo sum the data at time T.
8. The adaptive multi-channel wind lidar system of claim 3, wherein: the frequency changer (9) sets the threshold value of each area according to the feedback information of signal processing, starts to act when the threshold value is reached, and directly feeds back the tunable semiconductor laser (1) by changing the frequency for adjusting the conversion rate.
9. The adaptive multi-channel wind lidar system of claim 1, wherein: the attitude sensing module (10) performs corresponding monitoring according to the motion frequency of an object mounted on the radar, and performs corresponding compensation processing on the frequency of the synchronous radar, wherein during specific compensation, when V is 0, the default object is still, and when V is more than Z, a corresponding frequency is output to perform compensation processing on the frequency of the tunable semiconductor laser (1), wherein V refers to the motion frequency of the object mounted with the radar; z refers to the radar transmission frequency.
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| CN202110913297.0A CN113671532B (en) | 2021-08-10 | 2021-08-10 | Self-adaptive multichannel wind lidar system |
| PCT/CN2021/113437 WO2023015589A1 (en) | 2021-08-10 | 2021-08-19 | Adaptive multi-channel wind measurement lidar system |
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| CN115436971A (en) * | 2022-08-15 | 2022-12-06 | 南京牧镭激光科技有限公司 | Wind lidar system for realizing high extinction ratio based on single acousto-optic and use method thereof |
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| CN111965667B (en) * | 2020-10-14 | 2020-12-29 | 南京牧镭激光科技有限公司 | Dynamic compensation wind measurement laser radar system and wind measurement method thereof |
| CN116719057B (en) * | 2023-08-09 | 2023-11-10 | 青岛镭测创芯科技有限公司 | Laser radar system, coherent wind measuring method, device and medium of system |
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| CN109188461A (en) * | 2018-08-31 | 2019-01-11 | 成都盈风智创激光技术有限公司 | For measuring the cabin formula LDV technique of different height wind field |
| WO2020113356A1 (en) * | 2018-12-03 | 2020-06-11 | 南京牧镭激光科技有限公司 | Wind field information measurement method and engine room-type laser radar |
| CN110988841A (en) * | 2019-11-29 | 2020-04-10 | 中国华能集团清洁能源技术研究院有限公司 | Wake flow detection method, data processing device and radar |
| CN111965667A (en) * | 2020-10-14 | 2020-11-20 | 南京牧镭激光科技有限公司 | Dynamic compensation wind measurement laser radar system and wind measurement method thereof |
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| CN115436971A (en) * | 2022-08-15 | 2022-12-06 | 南京牧镭激光科技有限公司 | Wind lidar system for realizing high extinction ratio based on single acousto-optic and use method thereof |
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| WO2023015589A1 (en) | 2023-02-16 |
| CN113671532B (en) | 2023-05-30 |
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