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131 results about "Wind lidar" patented technology

SoDAR instruments measure the wind conditions by means of sound; LiDAR instruments use light to measure the wind characteristics. LiDAR systems can also be installed in top of a wind turbine to measure wind conditions in front and behind the turbine.

Low-altitude three-dimensional wind field inversion method and system based on single wind measurement laser radar

The invention discloses a low-altitude three-dimensional wind field inversion method and system based on a single wind measurement laser radar, relates to the technical field of radar detection, and solves the technical problems that a traditional wind measurement laser radar cannot directly obtain a velocity vector, data missing of a key area is caused by a blocking effect, and detection nodes are not uniform. The method specifically comprises the following steps: S1, executing a multi-elevation-angle body scanning detection mode and a wind profile detection mode by using a wind measurement laser radar, and obtaining radial wind speed data of a target area; s2, quality control is carried out on the radial wind speed, isolated abnormal points are eliminated, and isolated data missing points are filled; s3, carrying out blocking correction on a single scanning surface by using a smooth spline interpolation method; s4, after the radial wind speed is corrected based on the wind profile, an initial background three-dimensional wind field is obtained; and high-precision wind field inversion of a wind field in a three-dimensional space can be realized by using the radial wind speed of multi-layer body scanning of a single wind measurement laser radar.
Owner:HEFEI ZHONGKE GUANGBO QUANTUM TECH CO LTD +1

Space-coupled wind measurement laser radar real-time processing method

The invention relates to a space coupling wind measurement laser radar real-time processing method. The method comprises the following steps of performing quality inspection and data preprocessing on acquired power spectrum data; carrying out radial speed extraction on the power spectrums of the plurality of beam directions and the plurality of range gates; constructing a space coupling constraint based on the space continuity of the atmospheric wind field and the geometric law of vector projection; solving a global objective function containing a data fitting item and a spatial constraint item through a joint optimization algorithm to obtain optimal wind field estimation; and outputting the three-dimensional wind field and performing quality evaluation. According to the method, the coupling relationship between different spatial position measurement values is established by using spatial redundant information obtained by multi-beam scanning of the wind measurement laser radar, the wind field inversion precision is improved through a global optimization method, the abnormal value suppression capability is enhanced, and the spatial continuity of an inversion result is ensured.
Owner:WUXI ZHONGKE OPTOELECTRONICS TECH CO LTD

Inversion method of three-dimensional wind field based on coherent Doppler wind lidar

The invention relates to the technical field of laser radar wind field inversion, in particular to a coherent Doppler anemometry laser radar-based three-dimensional wind field inversion method, which comprises the following steps of: acquiring original power spectrum data of an anemometry laser radar to be inversed in each direction, and sequentially performing interpolation processing on the original power spectrum data in each direction to obtain an inversion result; obtaining power spectrum data after interpolation in each direction; calculating to obtain a cumulative power spectrum function; and optimizing the obtained vector three-dimensional wind field by using the cumulative power spectrum function so as to calculate the maximum function value of the cumulative power spectrum function, and the three-dimensional wind field corresponding to the maximum function value is the optimal three-dimensional wind field. According to the method, all the power spectrum data after azimuth interpolation are directly processed as a whole, random noise is averaged by using an accumulation process, a real signal is highlighted, and stable and accurate three-dimensional wind field inversion can be realized even when the signal-to-noise ratio is extremely low.
Owner:WUXI ZHONGKE OPTOELECTRONICS TECH CO LTD

Wind measurement laser radar system and wind measurement method of wind measurement laser radar

The invention relates to a wind measurement laser radar system, which comprises a first light source assembly for emitting first signal light and a second light source for emitting multimode pump laser, the acousto-optic device is used for performing pulse and frequency shift modulation on the first signal light to obtain second signal light; the first optical fiber is a double-cladding erbium-ytterbium co-doped optical fiber and is used for amplifying the second signal light to obtain third signal light; the polarization reflection device filters amplified spontaneous emission light in the third signal light to obtain fourth signal light; the first optical fiber further amplifies the fourth signal light again to obtain fifth signal light; the acousto-optic device performs pulse and frequency shift modulation on the fifth signal light again to obtain sixth signal light; the time division switching device controls the deflection module to deflect the sixth signal light, so that the sixth signal light is split by the beam splitting module at different time to obtain seventh signal light, the seventh signal light is emitted through different ports, the power of the two-way amplifier can be further improved, and the detection distance of the wind measurement radar is increased.
Owner:NANJING MOVELASER TECH CO LTD

Airborne wind measurement laser radar method and system

The invention relates to the technical field of airborne wind power measurement, and discloses an airborne wind measurement laser radar method and system. The method comprises the following steps: generating a scanning time sequence identifier and a path correction mark structure through scanning beat synchronization and stray light shielding processing; executing time-frequency demodulation and quality gating based on the back scattering signal to generate an observation wind speed initial value sequence; performing time alignment and motion compensation in combination with inertial navigation data, and generating a wind speed vector grid fragment through spatial interpolation and scanning geometric mapping; and finally, generating a configuration updating instruction structure through coordinate alignment and grid splicing. According to the invention, the precision and the anti-interference capability of wind field measurement in an airborne environment are effectively improved, and the data reliability and the system stability under a complex meteorological condition are remarkably enhanced through multi-source data fusion and a self-adaptive compensation mechanism.
Owner:ZHUHAI GUANGHENG TECH CO LTD

Cabin type laser radar wind field detection method and system based on multi-beam expansion

The invention discloses a cabin type laser radar wind field detection method and system based on multi-beam expansion. The cabin type laser radar wind field detection method and system are low in cost, high in sampling density, small in fitting error and high in measurement precision. The method comprises the following steps: transmitting a plurality of groups of uniformly distributed radial detection wave beams through a cabin type wind measurement laser radar, and carrying out omnibearing scanning on a target wind field; collecting radial wind speed observation data of each group of beams, performing nonlinear fitting processing on the observation data based on a cosine fitting model, and determining a mapping relation between fitting parameters and azimuth angles; the real wind speed and wind direction of the target wind field are calculated through the fitting model; the system comprises a transmitting module (1), a receiving module (2), a fitting calculation module (3) and an output module (4). The method is applied to the technical field of wind measurement laser radars.
Owner:ZHUHAI GUANGHENG TECH CO LTD

Wind resource assessment method based on millimeter wave wind finding radar

The invention relates to the technical field of wind energy resource assessment, and discloses a wind resource assessment method based on a millimeter wave wind finding radar. The method comprises the steps of collecting wind field data of a target area through a millimeter wave wind measurement radar and performing preprocessing to generate a standardized data set; inputting the data into a prediction model to obtain a wind energy distribution characteristic graph; generating a parameter set by adopting threshold segmentation based on the feature map, and dynamically constructing an evaluation function for simulation evaluation; synchronously collecting actual wind energy data, and calculating a deviation matrix between the actual wind energy data and a predicted value to quantify an evaluation error; performing parameter correction on the prediction model by using the error to obtain an optimized model; and finally, regenerating a feature map by adopting the optimization model and completing resource evaluation. According to the method, through online model correction and dynamic evaluation function construction, closed-loop optimization and data driving in the evaluation process are realized, and the accuracy of an evaluation result and the adaptability to a specific site are improved.
Owner:LIAONING XINNENG DIGITAL INTELLIGENCE TECH CO LTD

Wind field super-resolution method and system based on virtual wind measurement laser radar

The invention discloses a wind field super-resolution method and system based on a virtual wind lidar, and belongs to the technical field of radar simulation, and the method comprises the steps: simulating a three-dimensional transient turbulent flow wind field according to a computational fluid mechanics model, and obtaining a three-dimensional wake flow wind field containing the influence of airflow around a building; a radial projection visual angle of the simulated wind measurement laser radar converts a wind field slice with a preset height into a corresponding radial speed field, and simulated scanning wind field data and random sampling wind field data are generated through a simulated structured radar scanning process and random sampling according to a preset radial distance resolution and a scanning stepping angle. And based on the random sampling wind field data and the radial velocity field, constructing training data to train a modern generation type denoising model, and inputting the simulated scanning wind field data into the trained modern generation type denoising model to obtain a reconstructed radial wind field. According to the invention, the problems of pulse crosstalk, spectrum broadening, prolonged signal accumulation time and poor system stability caused in practice in the prior art are solved.
Owner:NANJING UNIV OF INFORMATION SCI & TECH

Turbulence correction and verification method based on wind lidar

The invention discloses a turbulence correction and verification method based on a wind lidar. The method comprises the following steps: S1, constructing grid data of a test area based on DEM data with 30m resolution and a vegetation coverage map with 30m resolution of the test area; s2, on the basis of the grid data of the test area, fluid simulation parameters, simulation reference wind speed and reconstructed wind speed of the test area are obtained through fluid simulation calculation, so that a wind speed correction coefficient is obtained; parameters of fluid simulation comprise a turbulence model, an inlet inflow broad line and roughness; s3, real-time wind speed and real-time wind direction are obtained based on the test area foundation wind measurement laser radar, and real-time turbulence is obtained through calculation; compared with the prior art, the virtual anemometer tower is constructed on the basis of a plurality of three-dimensional laser anemometer radars, point location measurement of a traditional anemometer tower is replaced by point location measurement of the virtual anemometer tower, and a convenient, real-time and reliable data source is provided for turbulence correction and verification of the foundation anemometer laser radars. And the accuracy of actual measurement of turbulence based on the ground-based anemometry laser radar is improved.
Owner:NANJING MOVELASER TECH CO LTD

Aircraft wake flow identification method, system and device based on anemometry laser radar and storage medium

The invention discloses an aircraft wake flow identification method, system and device based on a wind lidar and a storage medium, and belongs to the technical field of radar detection. The method comprises the following steps: acquiring low-resolution laser radar detection data; calculating the central position of an aircraft trailing vortex pair according to the low-resolution laser radar detection data, and dividing the low-resolution laser radar detection data based on the central position of the aircraft trailing vortex pair to obtain an input region; and inputting the input region into a pre-trained aircraft wake flow super-resolution model to obtain a high-resolution reconstructed aircraft wake flow field. According to the invention, the problems of fuzzy wake flow structure, large vortex core position deviation and underestimation of vortex circulation caused by insufficient range resolution of a wind measurement laser radar in the prior art are solved, and the detection precision and parameter identification capability of the laser radar on aircraft wake flow are effectively improved.
Owner:NANJING UNIV OF INFORMATION SCI & TECH

Wind shear early warning method based on airport wind measurement laser radar

The invention relates to the technical field of wind shear early warning, and provides a wind shear early warning method based on an airport wind lidar, which comprises the following steps of: 1, acquiring high-resolution three-dimensional wind field detection data based on high-resolution multi-mode continuous observation of the airport wind lidar; 2, performing data quality control on the three-dimensional wind field detected by the wind measurement laser radar based on a K-field frequency method; 3, performing wind shear identification inversion on the quality control data; 4, according to different influences of different wind shear sizes on flight control of the aircraft, performing early warning classification of different degrees on the wind shear of the horizontal wind; step 5, using divergence and a logistic regression model to optimize a wind shear value, and reducing a false alarm rate; and step 6, based on the airplane report of the airport, selecting a wind shear process, and checking and evaluating a wind shear early warning result. According to the invention, wind shear early warning can be well carried out.
Owner:CIVIL AVIATION FLIGHT UNIV OF CHINA

Three-dimensional scanning wind measurement laser radar system for offshore rocket platform

The invention provides a three-dimensional scanning wind measurement laser radar system for an offshore rocket platform, which comprises a three-dimensional scanning laser radar, a shipborne attitude compensation module, a data processing module and a protective cover, and is characterized in that the three-dimensional scanning laser radar is used for emitting laser pulses and receiving original detection signals which are scattered by aerosol and penetrate through the protective cover; correcting the direction of the scanning head according to the attitude compensation signal, and outputting scanning track correction data; the shipborne attitude compensation module monitors the attitude change of the platform and generates a compensation signal to counteract the shaking influence; after the data processing module preprocesses the original signal, atmosphere three-dimensional wind field data is calculated in combination with scanning track correction data; the protective cover isolates tail flame heat radiation, strong light and seawater erosion and is used for guaranteeing detection stability; based on an offshore rocket platform scene, platform shaking is offset through shipborne attitude compensation, tail flame and seawater interference is isolated through a protective cover, the atmospheric three-dimensional wind field is calculated in combination with data processing, and the high-precision wind measurement requirement in the marine environment can be effectively met.
Owner:NANJING MOVELASER TECH CO LTD

Lightweight coherent wind lidar system

The invention relates to the technical field of laser radar wind measurement, and discloses a lightweight coherent wind measurement laser radar system, which comprises a telescope system, a rotary loading main body shell, a scanning servo system, a laser emission module, a signal processing module, an environment monitoring module and a multi-mode communication module. Polarization control strategies are set according to different scanning directions, and the consistency standard of laser echo signal quality is guaranteed; meanwhile, whether the optical transmission distortion phenomenon exists in the scanning process or not can be recognized in real time by monitoring the spectral characteristics of the light source and the offset state of the preset reference in real time, the accuracy of Doppler frequency shift calculation is guaranteed, and the system error of wind field inversion is further reduced; whether an optical scanning axis deviates from a theoretical pointing reference or not is judged in real time by resolving a spatial deviation value of a radar body rotation attitude and a standard scanning track; therefore, the system can avoid the detection omission of the key atmospheric structure.
Owner:QINGDAO HUAHANG SEAGLET ENVIRONMENTAL TECH LTD

Dynamic yaw error compensation method and system based on cabin type wind lidar

The invention provides a dynamic yaw error compensation method and system based on a cabin type wind lidar. The method comprises the following steps: firstly, acquiring three-dimensional wind field data at a preset distance in front of a wind turbine, simultaneously acquiring operation state parameters of the wind turbine, then extracting unstable transverse component and longitudinal velocity gradient distribution in an incoming wind flow direction, and then calculating a real-time yaw error amount caused by dynamic change of a wind field; and converting the real-time yaw error amount into a feed-forward compensation control signal by combining the dynamic response characteristic of the yaw system of the wind turbine, finally inputting the feed-forward compensation control signal into a main controller of the wind turbine, and adjusting an angle set value of the yaw system so as to complete yaw error compensation of the laser radar. According to the technical scheme, the alignment precision, the wind energy capturing efficiency and the operation stability of the wind generating set under the complex changing wind condition are improved, and high-precision and high-reliability compensation of the dynamic yaw error is achieved.
Owner:YANGXIN DEHUI WIND POWER CO LTD

Two-dimensional wind field inversion method and system based on wind lidar and image processing

The invention discloses a two-dimensional wind field inversion method and system based on a wind lidar and image processing, and belongs to the technical field of radar simulation, and the method comprises the steps: obtaining smoothed radial wind speed data, and carrying out the inversion of a two-dimensional wind field through a speed-azimuth angle processing method; constructing a two-dimensional wind speed distortion criterion according to the radial wind speeds observed by two adjacent azimuth angles of the current observation azimuth angle, correcting the radial wind speed of the current observation azimuth angle, and extracting a corrected wind field structure component of a distortion area according to the corrected two-dimensional wind speed; subtracting the structure component of the radial wind field from the smoothed radial wind speed data to obtain the texture component of the radial wind field; converting the texture component of the radial wind field into the texture component of a two-dimensional wind field; and adding the texture component of the two-dimensional wind field and the corrected wind field structure component of the distortion area to obtain reconstructed wind field data. According to the method, the problem of high probability of overestimation or underestimation in the inversion process in the prior art is solved.
Owner:NANJING UNIV OF INFORMATION SCI & TECH

Single wind measurement laser radar three-dimensional wind field inversion method based on deep learning

The invention relates to the technical field of laser radar meteorological detection, and discloses a single wind measurement laser radar three-dimensional wind field inversion method based on deep learning, and the method comprises the following steps: S1, obtaining original power spectrum data obtained by scanning and detecting an atmospheric wind field through a single Doppler wind measurement laser radar; s2, preprocessing the original power spectrum data, and extracting observation characteristic parameters at least comprising a radial wind speed, a signal-to-noise ratio and a spectrum width; s3, the observation characteristic parameters are input into a pre-trained deep learning wind field inversion model, and the deep learning wind field inversion model takes the observation characteristic parameters as input and outputs three-dimensional wind vectors of three-dimensional space grid points with the position where the laser radar is located as an original point. The three-dimensional wind vector is directly inverted from the radial observation data of the single laser radar through the deep learning model, cooperation of multiple devices is not needed, and the system cost and deployment complexity are remarkably reduced.
Owner:HEFEI METEOROLOGICAL QUANTUM TECHNOLOGY INNOVATION RESEARCH CENTER

Method and apparatus for correcting wind speed error of multi-sea-state variable-integration wind lidar

The present disclosure can be applied to the technical field of LIDAR. Provided are a method and apparatus for correcting a wind speed error of a multi-sea-state variable-integration wind LIDAR. The method for correcting a wind speed error of a multi-sea-state variable-integration wind LIDAR comprises: acquiring attitude data of a wind LIDAR and a signal-to-noise ratio of an echo signal; minimizing a relative error value between simulation information of a degree-of-freedom coordinate value and measurement information of the degree-of-freedom coordinate value to obtain correction information of the degree-of-freedom coordinate value; on the basis of the signal-to-noise ratio and a buoy amplitude, determining a target pulse accumulation count from a pulse accumulation count lookup table; on the basis of the target pulse accumulation count, accumulating an initial pulse power spectrum to obtain a target pulse power spectrum; on the basis of a center frequency corresponding to the maximum power density in the target pulse power spectrum and the correction information of the degree-of-freedom coordinate value, obtaining a corrected radial wind speed; and performing inversion on the basis of the corrected radial wind speed to obtain a target wind speed vector.
Owner:UNIV OF SCI & TECH OF CHINA +1

Wave glider laser wind lidar-based wind field measurement method and system

The application provides a wind field measurement method and system based on a wave glider laser wind radar, comprising: measuring a wind field radial velocity based on a laser wind radar carried on a wave glider platform, measuring attitude data by an IMU, and measuring speed data by a GPS; obtaining an installation external parameter of an optical axis of the laser wind radar relative to a ship body of the wave glider platform through installation calibration; fusing and solving the attitude data measured by the IMU and the speed data measured by the GPS to obtain attitude angles and motion parameters of the wave glider platform; performing attitude compensation on the wind field radial velocity according to the attitude angles and the installation external parameter to obtain a real measurement direction, and performing motion compensation on the wind field radial velocity in the real measurement direction according to the motion parameters; performing vector inversion and height mapping on the wind field radial velocity after the motion compensation to obtain a wind profile. The application realizes high-precision measurement of an air wind field above a sea surface to a height of 2 km.
Owner:SANYA YAZHOU BAY INST OF DEEP SEA SCI & TECH SHANGHAI JIAOTONG UNIV +1

A dual-path controlled injection locking method for spaceborne high-energy single-frequency lasers

The present invention provides a dual-path controlled injection locking method for a satellite-borne high-energy, single-frequency laser. The dual-path controlled injection system includes an injection locking controller, a seed laser, an oscillator, an oscillator power supply, an RTP phase modulator, a piezoelectric ceramic (PZT), a photodetector, a Q-switch driver, an amplifier, an amplifier power supply, and a Q-switch. This novel dual-path controlled injection locking technology utilizes an RTP phase modulator for rapid cavity length scanning, supplemented by a PZT for slow cavity length scanning. This solves the problem of poor energy stability in satellite-borne, high-energy, compact, single-frequency lasers, improving energy stability by an order of magnitude and achieving high-energy, single-frequency pulsed laser output on the order of 100 millijoules with an output better than 0.5%. The high-stability, high-energy, single-frequency laser output achieved by this invention can be used in satellite-borne wind measurement lidars and satellite-borne hyperspectral lidars.
Owner:BEIJING RES INST OF TELEMETRY

Atmospheric boundary layer wind speed data fusion method, device and equipment based on hybrid wind lidar and medium

This application discloses a method, apparatus, equipment, and medium for fusing atmospheric boundary layer wind speed data based on a hybrid-system wind-measuring lidar, relating to the field of computer technology. The method includes: simultaneously acquiring coherent wind measurement data and direct sounding wind data currently measured by the hybrid-system wind-measuring lidar during atmospheric boundary layer wind field observation; performing spatiotemporal registration and preprocessing on the coherent wind measurement data and direct sounding wind data; fusing atmospheric boundary layer wind speed data based on the preprocessed wind measurement data and a current preset fusion model to obtain the current fused target wind speed data; the preset fusion model is a model constructed based on a heterogeneous dual-branch deep neural network; and determining the target atmospheric boundary layer wind profile based on the hybrid-system wind-measuring lidar and the target wind speed data. This application can achieve high-precision wind profile fusion, improving the accuracy, precision, and environmental robustness of atmospheric boundary layer wind speed data fusion.
Owner:QINGDAO LEICE TRANSIENT TECH CO LTD

Train operation environment monitoring method, train and storage medium

The invention provides a train operation environment monitoring method, a train and a storage medium, and is applied to the technical field of rail transit and the technical field of computers. The method comprises the following steps: controlling a coherent Doppler wind measurement laser radar to symmetrically emit laser beams in a train driving direction at a preset azimuth angle so as to obtain a laser echo signal of a preset distance area; beat frequency is carried out on the laser echo signal and the local oscillation light, photoelectric conversion is carried out, and a current signal is obtained; and monitoring the running environment of the train according to the current signal to obtain a monitoring result.
Owner:CRRC QINGDAO SIFANG CO LTD +1

Miniaturized three-dimensional wind lidar system

The application discloses a small three-dimensional wind measurement laser radar system with compact structure and good heat dissipation effect. The application comprises a swing rotating mechanism and a radar swing shell assembly installed on the swing rotating mechanism, wherein the radar swing shell assembly comprises a radar installation shell, a top cover, a bottom cover, a sealed front cover and a sealed rear cover are installed on the radar installation shell in sequence from top to bottom and from front to back, a ventilation cavity is formed between the top cover and the top of the radar installation shell, a plurality of air inlet holes are arranged at both ends of the top cover, a heat dissipation cooling cavity is arranged at the middle part of the radar installation shell, a plurality of cooling fans are arranged at the top of the heat dissipation cooling cavity and located in the middle part of the ventilation cavity, the bottom cover is provided with an air outlet hole in communication with the ventilation cavity, the inside of the radar installation shell is divided into a left cavity and a right cavity by the heat dissipation cooling cavity, and the radar heat dissipation components installed in the left cavity and the right cavity are attached to the two outer walls of the heat dissipation cooling cavity. The application is applied to the technical field of laser radars.
Owner:ZHUHAI GUANGHENG TECH CO LTD

Downslide high-resolution nonlinear three-dimensional wind field inversion method based on wind lidar

The invention relates to the technical field of laser radar wind field inversion, and provides a glide path high-resolution nonlinear three-dimensional wind field inversion method based on a wind measurement laser radar, and the method comprises the steps: obtaining and processing original actual measurement radial wind data, and obtaining effective actual measurement radial wind data; performing data interpolation processing to obtain medium-high resolution actually measured radial wind data; dividing a linear grid unit, and calculating a center node of the linear grid unit to obtain a three-dimensional wind speed initial value; calculating a global optimal gradient field of grid nodes in the three-dimensional fan-shaped cube of the glide path, and solving to obtain a nonlinear optimized three-dimensional wind field by using the three-dimensional wind speed initial value and the global optimal gradient field; and carrying out cyclic interpolation and optimization on the nonlinear optimized three-dimensional wind field to obtain a glide path high-resolution nonlinear three-dimensional wind field. According to the method, the spatial resolution and the physical fitting degree of wind field inversion are remarkably improved, the coverage range, the data refresh rate and the actual application reliability can be considered, and accurate high-resolution reconstruction of a complex wind field in a dynamic environment is achieved.
Owner:CIVIL AVIATION FLIGHT UNIV OF CHINA

Experimental simulation system of equivalent wind shear wind field

The invention provides an experimental simulation system of an equivalent wind shear wind field. According to the system, pulse light signals emitted by a wind measurement laser radar are simulated through different delay optical fibers to reach atmospheric stratification at different positions, then delayed pulse light is emitted to different positions of the side face of a rotating disc rotating at a constant speed, and echo signals obtain Doppler frequency shifts of different sizes due to different radial speeds; based on this, the change of wind speed in wind shear is simulated. A required equivalent wind shear wind field can be customized by adjusting the length of the delay optical fiber, the diameter of the turntable and the incident position of light on the side surface of the turntable. The system is simple in structure and low in cost, and can provide an equivalent wind shear wind field with accurate and controllable wind speed and abundant changes.
Owner:NANJING MOVELASER TECH CO LTD

High-wind-speed coherent laser wind-finding radar device

The invention discloses a high-wind-speed coherent laser wind-finding radar device, which comprises a seed laser, a plurality of cascaded acousto-optic frequency shift modules, a laser amplifier, a first optical switch, a laser transmitting and receiving detection module, a wind field inversion module and a wind speed identification and control unit, and is characterized in that the plurality of cascaded acousto-optic frequency shift modules realize frequency shift and beam splitting of the seed laser; the first optical switch selects the seed laser output by one acousto-optic frequency shift module as heterodyne detection seed laser; the wind field inversion module performs wind field inversion on the heterodyne beat frequency signal output by the balance detector to obtain a wind speed measurement result; the wind speed identification and control unit controls the frequency shift amount of the emitting seed laser and the frequency shift amount of the heterodyne detection seed laser, so that the difference value between the Doppler frequency shift amount caused by the wind speed and the frequency shift amount of the heterodyne detection seed laser is within the bandwidth range of the balance detector, and effective detection of the wind speed is achieved. According to the invention, the wind speed measurement range of the coherent wind lidar can be effectively improved, and the reduction of the wind speed measurement precision is not caused.
Owner:BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA

Low blind zone laser wind lidar

ActiveCN309673866SBlind zoneWind lidar
1. The name of the design product: low blind area laser wind-radar. 2. The use of the design product: the design product is used for measuring radial wind speed. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view.
Owner:LUOYANG JUHENG INTELLIGENT EQUIPMENT CO LTD

Method for generating simulation data of coherent wind lidar echo signal spectrum

A coherent wind lidar echo signal spectrum simulation data generation method is provided, comprising: obtaining the bottom noise of the echo signal; removing the bottom noise from the echo signal spectrum data and counting the variance of the random noise; performing normalization processing on the random noise and performing Gaussian fitting to obtain the amplitude, Doppler shift and bandwidth of the echo signal; recording the Doppler shift difference between adjacent range gates to obtain the power spectrum peak energy of a single spectrum data and the correction amount of the distance; respectively counting the statistical parameters of the random variable, the power spectrum peak energy, the correction amount of the distance and the bandwidth; generating a group of wind speed profile graphs by using random walk and normal distribution characteristics of random variables, generating bandwidths under different range gates that satisfy the Lorentz distribution, power spectrum peak energies of a single simulated spectrum that satisfy the chi-square distribution, and distance correction amounts that satisfy the normal distribution; and generating a single simulated spectrum by a radar equation and repeatedly generating complete spectrum simulation data.
Owner:UNIV OF SCI & TECH OF CHINA

Wind measurement laser radar system and method based on quantum interference

The application provides a wind measurement laser radar system and method based on quantum interference, a laser provides pulsed laser and continuous laser; the pulsed laser is emitted to a target airspace and a backscattering signal is received; the continuous laser is divided into first and second interference local oscillation lights; the second interference local oscillation light is adjusted to obtain quantum interference local oscillation light with intensity in a set proportion to the intensity of the backscattering signal; the backscattering signal is switched to a classical or quantum interference detection channel; classical interference detection data are obtained in the classical interference detection channel, and first wind speed information data are calculated according to the classical interference detection data; first and second single-photon detection data are obtained in the quantum interference detection channel, and second wind speed information data are calculated according to the first and second single-photon detection data; the first and second wind speed information data are spliced and spline interpolated to supplement the missing wind speed information data caused by the response time of the optical switch, and the wind speed information of the target airspace is obtained.
Owner:UNIV OF SCI & TECH OF CHINA +1

Wind measuring laser radar

ActiveCN310012728SRadarWind field
1. Name of the design product: wind measurement laser radar. 2. Use of the design product: the design product is an integrated coherent Doppler wind measurement laser radar, which is used for high-precision detection of atmospheric boundary layer wind field. 3. Design points of the design product: the overall shape of the product. 4. Picture or photo best indicating the design points of the design: perspective view 1.
Owner:SHENZHEN DARSUN LASER TECH CO LTD +1

Aerosol correction method and system suitable for high spectral resolution lidar

The application discloses an aerosol correction method and system suitable for a hyperspectral resolution laser radar, and relates to the technical field of laser radar detection. Specifically, the method comprises the following steps: a first auxiliary detection channel and a second auxiliary detection channel specially added and containing iodine molecular absorption cells are used to filter out aerosol Mie scattering components in specific frequency laser echoes; pure first atmospheric temperature data is obtained based on data inversion of the auxiliary detection channels; atmospheric aerosol backscattering ratios are calculated in combination with reference channel data; the backscattering ratios are used to correct wind speed and temperature inversion models of the laser radar, and then corrected atmospheric wind speed and temperature data are obtained. The application aims to expand the minimum detection height of a hyperspectral resolution Rayleigh temperature and wind measurement laser radar by accurately quantifying and eliminating aerosol interference, and to realize high-precision synchronous measurement of wind speed and temperature in low-altitude and aerosol-rich areas.
Owner:UNIV OF SCI & TECH OF CHINA