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35 results about "Cloud base height" patented technology

High clouds have base heights of 3,000 to 7,600 meters (10,000 to 25,000 ft) in polar regions, 5,000 to 12,200 meters (16,500 to 40,000 ft) in temperate regions, and 6,100 to 18,300 meters (20,000 to 60,000 ft) in the tropical region. Cloud ceiling is measured using a weather instrument known as a ceilometer.

Foundation cloud measuring method combining infrared and lasers

A foundation cloud measuring method combining infrared and lasers comprises the following steps that (1) atmosphere downward infrared radiation data are obtained through an uncooled infrared focal planar array sensor, zenith backward extinction coefficient profile data are obtained through a laser sensor, and the obtaining time of the atmosphere downward infrared radiation data is synchronous with the obtaining time of the zenith backward extinction coefficient profile data; (2) water vapor and aerosol radiation under cloud are estimated by combining the data, clear sky threshold values calculated through a radiation transmission pattern are used for conducting initial cloud detection, it is assumed that the cloud is a black body, and the cloud base height is obtained through inversion; (3) sequence analysis is conducted on infrared radiation images with high time resolution, the clear sky threshold values are combined to conduct further cloud detection, and the cloud cover is calculated; (4) proportionality coefficients between the cloud base height obtained through the infrared radiation inversion and the cloud base height obtained through laser measurement are fitted; (5) the cloud base height of a whole view field is corrected, and the typical cloud base heights of every ten minutes are obtained through calculation.
Owner:PLA UNIV OF SCI & TECH

Device and method for measuring two-waveband cloud height of foundation

The invention belongs to the field of atmospheric detection and particularly relates to a device and a method for measuring the two-waveband cloud height of a foundation. The device provided by the invention comprises a data processor, two visible light image sensors, an infrared sensor and a ground weather data receiving module, wherein the two visible light image sensors are respectively connected with the processor and used for obtaining and measuring the cloud images of a region sky; the infrared sensor is used for obtaining the air temperature of the region sky; the ground weather data receiving module is used for obtaining the ground weather data of a ground automatic weather station; and the processor computes the two-imaging cloud base height according to the image pair which is formed by the images, computes the vertical temperature descending gradient coefficients under the region cloud by combining the sky air temperature and the ground weather data to form a coefficient array and computes the region cloud height by selecting the multiple coefficient of the coefficient array. In the invention, a vertical temperature descending gradient coefficient array is formed by continuously obtaining and measuring the vertical temperature descending gradient coefficients under the region sky cloud, and the cloud height of the measured region sky is computed by selecting the multiple coefficients in the coefficient array, thereby greatly enhancing the accuracy that the infrared sensor measures the cloud height.
Owner:CMA METEOROLOGICAL OBSERVATION CENT

Regional ground surface irradiance distribution predicting method

The invention relates to a regional ground surface irradiance distribution predicting method which is used for determining minute-level ground surface irradiance regional distribution prediction within future 1 hour. The regional ground surface irradiance distribution predicting method comprises the following steps of: determining a local cloud base height; performing image process on a foundation cloud picture; predicting local ground surface irradiance distribution. The regional ground surface irradiance distribution predicting method provides calculation of the cloud base height by utilizing the ground surface regular meteorological observation data, realizes ground surface irradiance and photovoltaic power prediction within the local range through combination of foundation cloud picture data, is free from the dependence from a traditional method to the observation of the cloud base height, and improves calculation accuracy of cloud position and size at the absence of a ceilometer and the water level total irradiance prediction accuracy of a photovoltaic power station.
Owner:STATE GRID CORP OF CHINA +2

Real time acquiring method for sea fog thickness and height of low cloud base

The invention relates to a real-time acquiring method for sea fog thickness and cloud base height of low clouds. The method fully utilizes data from L wave band secondary wind-detecting radar and digital dropsonde data of an observatory, orderly analyzes distribution characteristics of the temperature and moisture of sea fog and the low clouds in the vertical direction, calculates stability degree conditions and turbulent flow conditions of lower atmosphere when the sea fog and the low clouds exist, makes statistical analysis and concludes the conditions to separate the sea fog and the low clouds, calculates the sea fog thickness and the low clouds height, and acquires the sea fog thickness and the low clouds height. The formed computer software automatically displays the result. The invention provides an effective method for monitoring in real time, namely simultaneously establishing an objective and feasible method for automatically extracting the cloud base height of the low clouds and monitoring the sea fog thickness in real time, has strong implementation, high reliability, and provides effective meteorological data for flight safety above the sea surface, maritime traffic transportation, as well as operations on harbors and costal airports.
Owner:OCEAN UNIV OF CHINA

Cloud-base height inversion method based on radio occultation detection data

The invention discloses a cloud-base height inversion method based on radio occultation detection data, comprising the following steps of: firstly, giving statistics of distribution characteristics within the worldwide COSMIC occultation vertical sounding scope and calculating the probability of the cloud-base height inversion influenced by the COSMIC sounding scope; secondly, reading temperaturedata and water vapour pressure data from COSMIC occultation detection moist air data; thirdly, acquiring cloud-base height information with the combination of relative humidity variation profile inversion based on the method brought forward by Wang for determining the cloud-base height by using relative humidity profile data; finally, based on the method brought forward by Wang for determining the cloud-base height by using the relative humidity profile data, carrying out the cloud-base height inversion by the adoption of radiosonde detection data, and calculating the relative difference between the radiosonde cloud-base height inversion result and the COSMIC cloud-base inversion result. The cloud-base height inversion method provided by the invention makes up the defects that previous satellite remote sensing can not provide bottom cloud-base height information and the reliability of field observation is poor for the detection of the medium cloud-base height and the high cloud-base height.
Owner:中国人民解放军理工大学气象学院

Cloud base height inversion method based on foundation cloud picture

The invention relates to a cloud base height inversion method based on a foundation cloud picture. The cloud base height inversion method comprises the following steps: (1) selecting places, deployingtwo whole-sky imaging instruments, setting a field angle of the two whole-sky imaging instruments to be not greater than 130 degrees, enabling the two whole-sky imaging instruments to perform synchronous observation, and enabling the observed foundation cloud picture to have an overlapped area; (2) acquiring the foundation cloud picture synchronously observed by the two all-sky imaging instruments, performing the image matching for the two foundation cloud pictures, and selecting the overlapped area with the smallest difference; and (3) for a cloud cluster selected in the overlapped area in amatching manner, and a cloud base height is inversed by utilizing a geometric relation to obtain an inversion result. Compared with the satellite cloud picture observed from the cloud top in the existing inversion method, the foundation cloud picture is observed on the ground by the whole-sky imaging instruments, i.e., the foundation cloud picture is observed from the cloud base, so that the accuracy of the cloud base height inversion result is improved, and the effect is more significant for the thick cloud and the low cloud. In addition, the application range of the whole-sky imaging instrument is also expanded.
Owner:NORTHWEST INST OF ECO-ENVIRONMENT & RESOURCES CAS

Cloud layer height measurement system and cloud layer height measurement method based on aircraft

ActiveCN103453882ASimple structureFlexible and accurate measurementHeight/levelling measurementMeasurement deviceCloud base
The invention relates to a cloud layer height measurement system based on an aircraft. The cloud layer height measurement system comprises an air measuring device and a ground control device. The air measuring device comprises the aircraft, a first control module, a location module, an airborne communication module and an image shooting device, wherein the first control module, the location module, the airborne communication module and the image shooting device are arranged on the aircraft, the image shooting device is perpendicularly arranged on the surface of the aircraft upwards in the shooting direction, the ground control module comprises a second control module, a ground communication module and an information output device, and the ground communication module and the information output device are connected with the second control module. The invention meanwhile relates to a cloud layer height measurement method. By means of the cloud layer height measurement system and the cloud layer height measurement device based on the aircraft, the cloud top height or the cloud base height can be flexibly and accurately measured according to measurement requirements, and the measurement work efficiency is effectively improved.
Owner:PLA UNIV OF SCI & TECH

Cloud base height estimation method for single-layer cloud facing flight vehicle navigation guidance

The invention discloses a cloud base height estimation method for a single-layer cloud facing flight vehicle navigation guidance. The method comprises that the cloud layer is divided into cloud of different attributes according to data of different wavebands in an Aqua satellite; the number of cloud layers in Cloudsat and the cloud top temperature and optical thickness in Aqua are obtained from asatellite database; the Cloudsat satellite data matches Aqua satellite data in the same latitude and longitude; matched data is divided into a group of training data and a group of test data; a trained model is used to determine whether cloud of different attributes belong to the single-layer cloud; the cloud layer thickness of the single-layer low cloud is calculated by using a physical mathematical model, and a calculation result and data in the Cloudsat serve as parameters in a contrast adjustment model; a model in which a parameter is modified is used to calculate the cloud base height again; and the cloud base height can be obtained by subtracting the cloud layer height from the cloud top height. The cloud base height of the single layer cloud can be calculated, an algorithm is less complex, and the calculation range of the cloud base height is widened.
Owner:HUAZHONG UNIV OF SCI & TECH

Multilayer cloud real-time distance measurement device and distance measurement method thereof

The invention discloses a multilayer cloud real-time distance measurement device and a distance measurement method thereof. The multilayer cloud real-time distance measurement device comprises a laser beam expanding and shaping system, an infrared laser diode, a signal identification timer, a system control module, a photoelectric detector, a subsequent light path, a small hole diaphragm and a receiving telescope; the laser beam expanding and shaping system is arranged in front of the infrared laser diode, and the infrared laser diode is connected to the signal identification timer; the signal identification timer is connected with the photoelectric detector, the photoelectric detector is connected with the subsequent light path, and the small hole diaphragm and the receiving telescope are arranged in front of the subsequent light path in sequence; the laser beam expanding and shaping system is formed by combination of a plurality of adjustable lenses; and the system control module includes a communication interface used for being connected with an upper computer. According to the multilayer cloud real-time distance measurement device provided by the invention, an efficient optical transmitting and receiving system and a simple low-cost distance measurement identification circuit are adopted, the multilayer cloud-base height can be measured, and the multilayer cloud real-time distance measurement device can automatically work all the time in an unattended manner.
Owner:STATE GRID CORP OF CHINA +1

System and method for measuring cloud base height through combination of radiation brightness temperature and photogrammetry

The invention discloses a system and a method for measuring a cloud base height through combination of radiation brightness temperature and photogrammetry. The method comprises the following steps: calibrating interior orientation elements and radiation brightness temperatures of two thermal infrared image sensors, shooting cloud images by using the two thermal infrared image sensors respectively, and acquiring original brightness temperature data; enhancing and filtering the two infrared cloud images respectively, and extracting and matching features of the images; according to an image matching result, acquiring a homonymy point; when the infrared cloud images have clear textures, according to a double imaging photogrammetric principle, calculating to acquire the cloud base height; according to the original brightness temperature data of the images, acquiring a brightness temperature value corresponding to the homonymy point, and establishing a relationship between the cloud base height and the brightness temperature; when the infrared cloud images have fuzzy textures or no textures, based on the relationship between the cloud base height and the brightness temperature at a previous time, calculating the cloud base height. Through the system and the method, the cloud height measuring precision is ensured on the premise of reducing the fog influence and improving the data acquisition rate.
Owner:CMA METEOROLOGICAL OBSERVATION CENT

Cloud base height inversion method and system based on multi-source satellite data

The invention discloses a cloud base height inversion method and system based on multi-source satellite data, and belongs to the atmospheric exploration. The method specifically comprises the steps: selecting a cloud layer classification model and a cloud base height inversion model according to the actual longitude and latitude through employing a cosine similarity method; inputting the actual cloud physical characteristics into the cloud layer classification model to obtain actual cloud layer category characteristics; and inputting the actual cloud layer category characteristics and the actual cloud physical characteristics into the cloud base height inversion model to obtain an actual cloud base height; matching the historical cloud base height with the historical cloud physical characteristics; performing data calibration on the initial training set; taking the historical cloud physical characteristics as input, taking the historical cloud class characteristics as output, and training the cloud layer classification model in different regions; and training a cloud base height inversion model in different regions by taking the historical cloud layer category features and the historical cloud physical features as inputs and taking the historical cloud bottom height as an output. According to the method, the coverage range of cloud base height observation and prediction is expanded, and the precision of cloud base height inversion is also improved.
Owner:HUAZHONG UNIV OF SCI & TECH

Remote sensing detection system and detection method for condensable water volume of air cloud system

The invention discloses a remote sensing detection system for the condensable water amount of an air cloud system. The remote sensing detection system includes a mie-scattering laser radar which is used for acquiring height values of a cloud bottom and a cloud top, a rotating Raman laser radar which is used for acquiring atmospheric temperature profile data, a wind measurement laser radar which is used for acquiring a vertical movement speed of an air flow, and a micro-rain radar which is used for judging whether rainfall exists. The Mie scattering laser radar, the rotating Raman laser radar, the wind measurement laser radar and the micro rain radar are all connected to the data processing system. The detection method comprises the following steps: 1, vertically observing the sky; 2, obtaining the height of the cloud bottom and the height of the cloud top; 3, calculating the saturated water vapor density of the cloud bottom and the cloud top; 4, obtaining the vertical airflow movement speed;5, calculating the condensable water quantity in the atmosphere within a period of time; and 6, calculating the condensable water quantity in the cloud. according to the invention, high-precision detection of the air condensable water quantity can be realized, and the problem that the air condensable water quantity cannot be observed in the existing atmospheric science field is solved.
Owner:XIAN UNIV OF TECH

Method and device for reconstructing three-dimensional cloud body through satellite-ground cloud fusion, electronic equipment and medium

The embodiment of the invention discloses a method and device for reconstructing a three-dimensional cloud body through satellite-ground cloud fusion, electronic equipment and a medium. The method for reconstructing the three-dimensional cloud body through satellite-ground cloud fusion comprises the steps of obtaining foundation cloud observation data of at least three cloud radars; acquiring multichannel scanning imaging radiometer data and cloud detection product data of the geostationary orbit meteorological satellite; performing space-time matching on the foundation cloud observation data, the multi-channel scanning imaging radiometer data and the cloud detection product data to obtain satellite-ground matching data; cloud top height inversion of a satellite in a preset area around each cloud radar installation point is realized based on the satellite-ground matching data, and the cloud top height of a cloud radar networking area is obtained; obtaining the cloud bottom height of the cloud radar networking area based on the ground-based cloud observation data; obtaining a three-dimensional cloud body boundary based on the cloud top height and the cloud bottom height; and obtaining a reconstructed three-dimensional cloud body based on the reflectivity factor profile and the radial speed profile in the foundation cloud observation data.
Owner:CMA METEOROLOGICAL OBSERVATION CENT

Three-dimensional cloud scene modeling and visualization method based on foundation cloud picture

PendingCN114332364ARealize near real-time modelingSolve complexity3D modellingComputational scienceVoxel
The invention provides a three-dimensional cloud scene modeling and visualization method based on a foundation cloud picture, and the method comprises the steps: extracting a cumulus cloud image region from a two-dimensional foundation cloud picture through a CPU, and calculating the cloud base height and the cloud cluster thickness as the parameters of three-dimensional cumulus cloud modeling. The position information of all voxel center points forming the cumulus cloud model is determined according to the two parameters, the position information serves as a vertex array to be transmitted into the GPU, all cumulus cloud voxels are drawn according to the vertex array in the geometric shader stage of the GPU, finally, the GPU enters the fragment shader stage, the density value of the cloud is determined according to the distance between each voxel and the cloud cluster center point, and the density value of the cloud is calculated. And calculating the color of the voxel according to the density value so as to realize three-dimensional cloud scene modeling and visualization integration. According to the method, the voxels serve as the minimum geometric units, the three-dimensional cumulus cloud model is constructed based on the GPU, visualization is achieved in the three-dimensional scene, the three-dimensional cumulus cloud modeling efficiency is improved, and meanwhile the requirement for smooth roaming in the three-dimensional geographic scene is met.
Owner:WUHAN UNIV

Method for calculating cloud base height by using meteorological satellite data

The invention discloses a method for calculating the height of a cloud base by using meteorological satellite data, and the method comprises the steps: obtaining an FY-2 satellite cloud region humidity profile product and a cloud classification product, carrying out the time and space matching of the FY-2 satellite cloud region humidity profile data, the cloud classification data and earth surface type data, and obtaining two registered products and earth surface type data; performing statistics to establish cloud base height characteristic value models of different cloud types and different cloud region humidity profiles; and establishing a calculation model of different cloud classifications and cloud region humidity profiles, analyzing to obtain a vertical structure and cloud classes of the cloud, and comprehensively estimating the cloud base height according to cloud base height feature values of different cloud classes and vertical structure features of the cloud. According to the method for calculating the cloud base height by using the meteorological satellite data, the real-time calculation of the cloud base height can be realized, the 15-minute time frequency, the 5-kilometer spatial resolution and the full-coverage cloud base height can be obtained, the calculation efficiency is high, and the real-time calculation can be realized in a place with a data environment.
Owner:NAT SATELLITE METEOROLOGICAL CENT

Cloud base height quick measurement method

The invention discloses a cloud base height quick measurement method. A double-sensor imaging cloud base high measuring device is adopted; s1 and s2 are the photographic centers of two sensors; a1 anda2 are the corresponding image points of two photos; an A point is a cloud base point to be measured; after a sensor and a rotating platform are installed and integrated, the main optical axis of thesensor and a rotating axis have a certain placement angle error, so the a placement angle constant is measured at first, and then cloud base height measurement is performed. The cloud base height quick measurement method includes the following steps that: step 1, a known target is observed, an orientation angle is measured, a cloud area is photographed, a cloud image is processed, and corresponding image points are extracted, and distortion correction is performed; and step 2, cloud base height calculation is performed: on the basis of elements of exterior orientation and the corresponding image points which are obtained previously, calculation is performed through the forward intersection principle of photogrammetry, so that cloud base height can be obtained.
Owner:山东省国土测绘院

Cloud Base Height Measurement System and Method Combining Radiation Brightness Temperature and Photogrammetry

The invention discloses a system and a method for measuring a cloud base height through combination of radiation brightness temperature and photogrammetry. The method comprises the following steps: calibrating interior orientation elements and radiation brightness temperatures of two thermal infrared image sensors, shooting cloud images by using the two thermal infrared image sensors respectively, and acquiring original brightness temperature data; enhancing and filtering the two infrared cloud images respectively, and extracting and matching features of the images; according to an image matching result, acquiring a homonymy point; when the infrared cloud images have clear textures, according to a double imaging photogrammetric principle, calculating to acquire the cloud base height; according to the original brightness temperature data of the images, acquiring a brightness temperature value corresponding to the homonymy point, and establishing a relationship between the cloud base height and the brightness temperature; when the infrared cloud images have fuzzy textures or no textures, based on the relationship between the cloud base height and the brightness temperature at a previous time, calculating the cloud base height. Through the system and the method, the cloud height measuring precision is ensured on the premise of reducing the fog influence and improving the data acquisition rate.
Owner:CMA METEOROLOGICAL OBSERVATION CENT

Cloud-base height inversion method based on radio occultation detection data

ActiveCN102230796BImprove inversion accuracyMake up for the defect of poor detection reliabilityHeight/levelling measurementRadiosondeCloud base
The invention discloses a cloud-base height inversion method based on radio occultation detection data, comprising the following steps of: firstly, giving statistics of distribution characteristics within the worldwide COSMIC occultation vertical sounding scope and calculating the probability of the cloud-base height inversion influenced by the COSMIC sounding scope; secondly, reading temperaturedata and water vapour pressure data from COSMIC occultation detection moist air data; thirdly, acquiring cloud-base height information with the combination of relative humidity variation profile inversion based on the method brought forward by Wang for determining the cloud-base height by using relative humidity profile data; finally, based on the method brought forward by Wang for determining the cloud-base height by using the relative humidity profile data, carrying out the cloud-base height inversion by the adoption of radiosonde detection data, and calculating the relative difference between the radiosonde cloud-base height inversion result and the COSMIC cloud-base inversion result. The cloud-base height inversion method provided by the invention makes up the defects that previous satellite remote sensing can not provide bottom cloud-base height information and the reliability of field observation is poor for the detection of the medium cloud-base height and the high cloud-base height.
Owner:中国人民解放军理工大学气象学院

A Cloud Base Height Retrieval Method Based on Ground-Based Cloud Image

The invention relates to a cloud base height inversion method based on a foundation cloud picture. The cloud base height inversion method comprises the following steps: (1) selecting places, deployingtwo whole-sky imaging instruments, setting a field angle of the two whole-sky imaging instruments to be not greater than 130 degrees, enabling the two whole-sky imaging instruments to perform synchronous observation, and enabling the observed foundation cloud picture to have an overlapped area; (2) acquiring the foundation cloud picture synchronously observed by the two all-sky imaging instruments, performing the image matching for the two foundation cloud pictures, and selecting the overlapped area with the smallest difference; and (3) for a cloud cluster selected in the overlapped area in amatching manner, and a cloud base height is inversed by utilizing a geometric relation to obtain an inversion result. Compared with the satellite cloud picture observed from the cloud top in the existing inversion method, the foundation cloud picture is observed on the ground by the whole-sky imaging instruments, i.e., the foundation cloud picture is observed from the cloud base, so that the accuracy of the cloud base height inversion result is improved, and the effect is more significant for the thick cloud and the low cloud. In addition, the application range of the whole-sky imaging instrument is also expanded.
Owner:NORTHWEST INST OF ECO ENVIRONMENT & RESOURCES CAS

Vehicle-mounted ceilometer chamber

The invention discloses a vehicle-mounted ceilometer chamber which comprises a ceilometer chamber body, a chamber door, a chamber door inclined strut, a slide rail, a retractable platform, a circular turntable, turntable bolts, a locking bolt and the like. The complete equipment is used for fixing and supporting a ceilometer during transportation and detection work and is placed in a ceilometer chamber formed in a detection vehicle. The chamber door is opened and placed in a horizontal direction through the chamber door inclined strut, the turntable bolts are loosened, the locking bolt is taken out, the ceilometer, together with the retractable platform and the circular turntable, is pulled onto the chamber door through the slide rail, the locking bolt is screwed, the turntable bolts are rotated into circular holes in the retractable platform, and the ceilometer enters into a working state. According to the invention, the ceilometer is fixed in a special chamber, damage caused by external force during transportation is avoided, and the ceilometer can be directly taken out and placed on a vehicle to carry out cloud base height detection without being carried to the ground and can be rotate in different directions to perform cloud base height detection in different directions. The vehicle-mounted ceilometer chamber has the advantages of compact and reasonable integral design, simple structure, low cost, convenience in use and firmness in fixation.
Owner:PLA UNIV OF SCI & TECH

Laser altimeter cloud scattering error correction method and device

The invention provides a laser altimeter cloud scattering error correction method and device. The method comprises the steps that: the echo waveform data of height measurement laser are obtained, andthe echo waveform data comprises echo powers at different altitudes; original height measurement data according to the echo waveform data are calculated; backscattering coefficients and extinction coefficients at the different altitudes are calculated according to the echo power; a cloud top height and a cloud bottom height are calculated according to the backscattering coefficients; a weakening coefficient is calculated according to the backscattering coefficients and the extinction coefficients; cloud optical thickness is calculated according to the cloud top height, the cloud bottom heightand the weakening coefficient; a height measurement deviation correction value is calculated according to the cloud optical thickness and a height measurement deviation model caused by atmospheric scattering; and corrected height measurement data are calculated according to the original height measurement data and the height measurement deviation correction value. By means of the method, the height measurement deviation correction value can be rapidly calculated, and the calculated height measurement deviation correction value is accurate.
Owner:自然资源部国土卫星遥感应用中心

Multilayer cloud real-time ranging method

The invention discloses a multilayer cloud real-time distance measurement device and a distance measurement method thereof. The multilayer cloud real-time distance measurement device comprises a laser beam expanding and shaping system, an infrared laser diode, a signal identification timer, a system control module, a photoelectric detector, a subsequent light path, a small hole diaphragm and a receiving telescope; the laser beam expanding and shaping system is arranged in front of the infrared laser diode, and the infrared laser diode is connected to the signal identification timer; the signal identification timer is connected with the photoelectric detector, the photoelectric detector is connected with the subsequent light path, and the small hole diaphragm and the receiving telescope are arranged in front of the subsequent light path in sequence; the laser beam expanding and shaping system is formed by combination of a plurality of adjustable lenses; and the system control module includes a communication interface used for being connected with an upper computer. According to the multilayer cloud real-time distance measurement device provided by the invention, an efficient optical transmitting and receiving system and a simple low-cost distance measurement identification circuit are adopted, the multilayer cloud-base height can be measured, and the multilayer cloud real-time distance measurement device can automatically work all the time in an unattended manner.
Owner:STATE GRID CORP OF CHINA +1

Double-view-field multi-wavelength Raman laser radar beam splitting system suitable for different cloud base heights

PendingCN113406668ASimple structureRealize multi-wavelength dual field of view spectroscopicElectromagnetic wave reradiationICT adaptationAtmospheric layerCloud base
The invention relates to a double-view-field multi-wavelength Raman laser radar beam splitting system suitable for different cloud base heights. The system comprises a double-view-field device, a large-view-field light path system and a small-view-field light path system. The double-view-field device comprises at least two double-view-field light splitting devices with different sizes so as to adapt to atmosphere detection of different cloud base heights; the double-view-field light splitting device is used for enabling one part of echo signals reflected by the atmosphere to enter the large-view-field light path system and the other part of the echo signals to enter the small-view-field light path system; the large-view-field optical path system and the small-view-field optical path system are both used for screening out optical signals with different wavelengths in corresponding view fields. The splitting system not only can adapt to atmosphere detection of different cloud base heights, but also is simple in structure and convenient to operate, is applied to the laser radar, and can effectively and reliably detect atmosphere parameters of water cloud and aerosol based on double view fields.
Owner:BEIFANG UNIV OF NATITIES

Cloud base height inversion method based on satellite-borne multi-channel radiation imager

The invention discloses a cloud base height inversion method based on a satellite-borne multi-channel radiation imager. The cloud base height inversion method comprises the following steps: carrying out cloud detection by utilizing observation data of the satellite-borne multi-channel radiation imager; for a single-layer cloud pixel, calculating a cloud water path according to the cloud optical thickness and the cloud effective particle radius; analyzing the relationship between the cloud water path, the cloud top height and the environment factor and the effective cloud water content by using multi-source satellite observation data, and establishing a lookup table of the effective cloud water content; an effective cloud water content estimation value is obtained through the lookup table, and then the cloud water path is divided by the effective cloud water content to obtain the cloud geometric thickness; subtracting the calculated cloud geometric thickness from a known cloud top height inversion result to obtain a cloud bottom height inversion result of the target single-layer cloud; estimating the cloud bottom height of the multilayer cloud by using an extrapolation method; and verifying an inversion result, and optimizing the algorithm. According to the method, better effective cloud water content estimation can be obtained, and the cloud base height can be quickly and effectively inverted; and indirectly inverting the height of the cloud base of the multi-layer cloud by using an extrapolation method.
Owner:NAT UNIV OF DEFENSE TECH

A Method for Estimating the Height of Monolayer Cloud Base for Aircraft Navigation and Guidance

The invention discloses a cloud base height estimation method for a single-layer cloud facing flight vehicle navigation guidance. The method comprises that the cloud layer is divided into cloud of different attributes according to data of different wavebands in an Aqua satellite; the number of cloud layers in Cloudsat and the cloud top temperature and optical thickness in Aqua are obtained from asatellite database; the Cloudsat satellite data matches Aqua satellite data in the same latitude and longitude; matched data is divided into a group of training data and a group of test data; a trained model is used to determine whether cloud of different attributes belong to the single-layer cloud; the cloud layer thickness of the single-layer low cloud is calculated by using a physical mathematical model, and a calculation result and data in the Cloudsat serve as parameters in a contrast adjustment model; a model in which a parameter is modified is used to calculate the cloud base height again; and the cloud base height can be obtained by subtracting the cloud layer height from the cloud top height. The cloud base height of the single layer cloud can be calculated, an algorithm is less complex, and the calculation range of the cloud base height is widened.
Owner:HUAZHONG UNIV OF SCI & TECH
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