74 results about "Cloud height" patented technology

A method for achieving optimum coaxial lidar configuration using optical fibers. Optical fibers are used with mirrors or lenses to create light paths that can achieve an optimum lidar configuration while employing fewer components than that of prior art for a more simplified, lightweight, and less expensive system to produce. The lidar components, including the laser source and the light detector unit, may be placed in a separate housing. A separate housing eliminates unnecessary weight in the optical telescope assembly, makes scanning of the system easier, and enables a better omni-directional cloud height indicator.

The invention relates to a method for detecting cloud height by utilizing cloud shadow information in satellite remote sensing data, which pertains to the field of atmospheric exploration and comprises the following five steps: interpolation calculation, cloud and cloud shadow detection, the matching of the cloud with the cloud shadow by MODIS data, establishment of a cloud height model for obtaining the height of cloud layer, and cloud height calculation and analysis. The method for detecting the cloud height detects the information on the cloud and the cloud shadow in the remote sensing image data, matches the cloud with the cloud shadow by combining with digital image technology and obtains the distance between the cloud and the cloud shadow; and finally the cloud height model is established to obtain the height of the cloud layer. The method for detecting the cloud height can simultaneously calculate the heights of multiple points of a piece of cloud and the height values obtained in the way can greatly improve detection accuracy of cloud heights. The cloud height can be measured in any place where the measurement conditions are met and no measurement device is needed to be set locally.

A system operable to generate a surround view based on image data, where the image data may include image data associated with surroundings of an object, such as a vehicle. The system may also be operable to project the surround view inversely onto a bowl-shaped projection surrounding the object. Further, the system may be operable to generate a virtual user view via a virtual camera position, where the virtual camera position is on a first horizontal ellipse that is about the bowl-shaped projection at a first height. Also, the system is operable to determine a viewing direction from the virtual camera position that points at a location on a second horizontal ellipse that is about the bowl-shaped projection at a second height. The second height may be lower than the first height and the second horizontal ellipse may be smaller than the first horizontal ellipse.

The invention discloses a ground terahertz radar system for detecting a cloud. The system comprises a terahertz transmitting module, a terahertz receiving module, a terahertz transmitting-and-receiving antenna module, a terahertz signal processing module and an upper computer module; the center frequency of a terahertz signal transmitted by the terahertz transmitting module is 220 GHz, the work bandwidth is 5 GHz, the transmitting power is 200 mW, the pulse width is adjustable ranging from 100ns to 3mus and the adjusted step length is 100ns, and the pulse repletion frequency is adjustable ranging from 1KHz to 10KHz and the adjusted step length is 1KHz. Compared with a laser radar and a millimeter wave radar, the ground terahertz radar system for detecting the cloud utilizes a set of parameters applicable to the cloud detection and is capable of penetrating into a thin cloud and an extremely thin cloud to carry out the three-dimensional structure detection for the cloud, and therefore not only a macrostructure such as the cloud thickness, the cloud height, the number of cloud layers, the vertical section variance of the cloud can be obtained, but also a microstructure such as the size, the shape, and the ice water content of a cloud particle can be obtained.

Disclosed is a system and method for static and dynamic positioning or motion control of a marine structure by using real-time monitoring of at least one of a mooring line, marine environments, 6-dof movement of a marine structure, a tank state, a ship topside, the seabed, or their combinations. The static and dynamic real-time monitoring data of the mooring line is obtained and processed for positioning the marine structure or controlling and managing a motion thereof. Here, 1) a tension of a mooring line is measured by means of real-time monitoring of the mooring line, 2) various marine environment elements such as wind direction, wind speed, air humidity, atmospheric pressure, atmosphere temperature, cloud height, visibility, ocean wave, wave height, sea current speed, sea current direction, rain or the like are measured by means of real-time monitoring of the marine environments, 3) 6-dof movement of the marine structure is measured by means of real-time monitoring of the marine structure, 4) ullage and sloshing data of various tanks in the marine structure are measured by means of real-time monitoring of tank states, 5) damage and life of pipes, facilities or the like located at a ship topside of the marine structure are measured by means of real-time monitoring of the ship topside, 6) damage and life of umbilical cables, pipes, pumps and valves located on the seabed are measured by means of real-time monitoring of the seabed, and suitable static and dynamic positioning or motion control and management may be automatically performed based thereon.

The invention discloses an on-line canopy height detection method for automatic control of the header height of a harvesting machine. The method comprises the steps that the point cloud data of crops in front of the harvester are acquired, and the point cloud data are converted from polar coordinates into a world coordinate system; a region of interest is established, and the point cloud data outside the region of interest are eliminated; noise points in the point cloud data are removed; the Delaunay irregular triangulation method is used to establish a digital surface model based on a small number of first control points; based on a small number of second control points, the Delaunay irregular triangulation method is used to establish a digital ground model; the digital ground model is subtracted from the digital surface model to acquire a canopy height model, and then acquire the canopy height. According to the invention, the canopy height in front of the harvesting machine and the ground height can be detected, and a data basis is provided for the intelligent control of the header height of the harvesting machine.

A jet airplane features that its main body is a flat rectangle and its longitudinal cross-section and two sides are all the cross-section of standard wing. Its advantages are high elevating force generated by its main body, short length and span, lower height, light dead weight and low cost. It has also the engine able to jet in different directions and the emergency lifesaving system.

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.

The invention discloses a cloud top height retrieval method based on satellite tri-linear array CCD (charge coupled device) image. The method comprises the following steps: firstly selecting a cloud region in a foresight image, carrying out image matching to obtain a corresponding matching point in a back-sight image; secondly, obtaining the continuous static satellite image of adjacent time sections of the foresight image, and retrieving the wind speed and direction in the corresponding region; then, obtaining the time interval of cloud points in the foresight image and the back-sight image, and computing the displacement of the cloud points; and finally inferring the forward interaction formula of a moving target and combining the relative information of cloud point displacement and matching pair to obtain the cloud top height information. In the process of detecting the cloud top height by using the tri-linear array detector, the defects that height detection of the cloud tope height is greatly influenced caused by the moving of the cloud are compensated.

The invention provides a buoy-based long-time on-line monitoring apparatus for the sea cloud height. The apparatus comprises a buoy; and a laser ceilometer, a buoy attitude measuring module, a cloud height correction and compensation module, a communication module, and a meteorology and hydrology observation sub system. The buoy attitude measuring module is used for measuring attitude parameters, like a heading parameter, a rolling parameter and a pitching parameter, of a buoy platform; the cloud height correction and compensation module is used for realizing cloud height observation correction and compensation based on the attitude parameters of the ceilometer; and the communication module is used for uploading the data that can be used by users. According to the invention, buoy-based laser radar cloud height observation is carried out and the measurement result is accurate and reliable; off-shore, long-term continuous, real-time, high-precision, high-temporal-spatial-resolution marine environment monitoring on the cloud height, cloud thickness, and conventional marine meteorology and hydrology can be realized; an accurate and reliable data support can be provided for scientific researches of marine atmosphere, weather forecasting, ocean shipping, and naval drills and the like; and thus the apparatus has important significance in development of multiple fields like the marine economy, the marine science and technology, and the legal rights safeguarding on the sea.

A method and apparatus for scavenging atmospheric energy, causing rainfall, and for dissipating severe weather formations using a lighter-than-air dirigible or balloon suspended by two controlled tethers wound on motorized spools, the tethers being electrically connected to a high-voltage electrostatic generator on the ground. The dirigible is suspended by the tethers at cloud height which is adjustable by the spools. The dirigible includes a conductive foil skin suitable for carrying a conductive charge. To produce rainfall, the dirigible is charged by the electrostatic generator through the tethers at a voltage that is high enough to attract ions of water vapor. To produce energy, the dirigible scavenges charge from upper cloud layer positive ions and distributes the charge down through tethers where it can be collected and used for motive power or to charge batteries. To avert severe weather, the dirigible equalizes the negatively charged earth with the upper cloud layer positive ions, thereby eliminating the charge of the severe weather system.

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.

A cloud height automatic observation process and a device. The device includes an image collector, in which two image collectors form a collecting unit; a sampling controller emitting the cloud image sampling command to two image collectors; an image transmission device respectively connected with two image collector for transmitting cloud picture collected by the image collector to an image processing and sampling control device and transmitting the command from image processing and sampling control device to the cloud picture collecting unit; an image processor connected with the image transmitting device for processing image and automatically measuring the height and the horizontal position of the cloud. The device has simple structure, lower cost and finishes the cloud height measuring automatically and is applied in the fields such as aviation, aerospace and weather.

The invention provides a novel laser radar system based on the coaxial optics and single photon detection technology, and a detection method. By transmitting pulse laser of certain frequency into theatmosphere through a coaxial laser device, the atmosphere generates a scattering effect on the laser, after the backward scattered laser is received by a coaxial receiving mirror, the light is focusedand then is projected onto a detector; the detector can realize automatic gain adjustment, and once an optical signal is input, a pulse signal is output; the pulse signal enters a TCSPC data collection device through a radio frequency cable, the device can achieve a resolution of 32ps, so the input time of the signal can be accurately distinguished; and after the signal is collected, a latter algorithm processes the data in real time, analyzes the current atmospheric state, the distance of pollutants and the forms of the pollutants or the like. The radar is suitable for cloud height testing,fog monitoring, pollutant emission monitoring, laser ranging, atmospheric aerosol monitoring, ozone layer testing, temperature and humidity monitoring, and the like.

The present invention discloses a method and device for prediction of radiation received by a photovoltaic power station. The method for prediction of radiation received by the photovoltaic power station comprises: obtaining the water content of an echo monomer; calculating cloud height and cloud thickness data with respect to a cloud cluster monomer in a scanning area according to the spatial distribution of the water content of the echo monomer; calculating the motion vector of the cloud cluster monomer according to the monomer echo intensity data scanned by a radar; determining whether the cloud cluster monomer may shield the photovoltaic power station in a preset time according to the motion vector of the cloud cluster monomer; and predicting the radiation received by the photovoltaic power station under the shield of the cloud cluster monomer according to actual measurement monitoring data, weather type theory radiation data, the water content of the echo monomer and the cloud height and cloud thickness data of the photovoltaic power station when determining the cloud cluster monomer may shield the photovoltaic power station. According to the invention, the radiation attenuation relation caused by shield of different clouds may be accurately calculated, and the prediction accuracy of the photovoltaic power may be improved.

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.

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.

The invention discloses a measurement method and a monitoring system of atmosphere vertical visibility. In the measurement method, by means of a new relationship of extinction coefficient to visibility, which is established through a laser cloud height instrument and a visibility instrument, an influence on the vertical visibility due to difference of the relationship of the extinction coefficient to the visibility since the micro-physical characters of atmospheric aerosol particles are different can be overcome, so that the atmosphere vertical visibility can be measured more definitely and can be applied in various environments. The monitoring system can achieve monitoring of the atmosphere vertical visibility in real time in all weather in an unmanned unattended operation manner.

The invention provides a high-resolution remote sensing image cloud height detection method. According to the method, the cloud height can be detected out through inputting two remote sensing images of the same objective at two different angles. Firstly, the input images are segmented into three parts: the ground, the cloud and the cloud and ground; then, an SIFT (scale invariant feature transform) matching algorithm is used for calculating the matching result of the ground and the cloud, and in addition, an RANSAC ((random sample consensus) algorithm is used for removing ground mismatching points to obtain the coordinate conversion relationship of the ground points of the two images; the conversion relationship of the ground points is used, the invention provides a method for removing cloud mismatching points by using cycles, and the projection deviation of the cloud to the ground can be accurately obtained; finally, the cloud height can be obtained by using a mathematical model according to the protection deviation and the known imaging angle of the two images. The high-resolution remote sensing image cloud height detection method has the advantages that the problem of matching precision reduction due to conversion of rotation, affinity and the like of the same cloud in images at different angles due to satellite attitude can be effectively solved, and the cloud height detection precision is improved.

The invention discloses a coaxial optical system for measuring cloud height based on a micro pulse laser radar, which comprises an outgoing light source, a collimating mirror, a receiving reflecting mirror, a main transmitting and receiving lens, a small aperture diaphragm, a filter and a photodetector. The receiving reflecting mirror is inclined and placed at 45 degrees, and the receiving reflecting mirror is provided with a transmission region and a reflection region; emergent light emitted by the outgoing light source is irradiated to the transmission region through the collimating mirror and the small aperture diaphragm; the emergent light is transmitted to the main transmitting and receiving lens via the transmission region, and the main transmitting and receiving lens irradiates theemergent light to cloud formation in the air; the emergent light is irradiated to the cloud formation to generate mie scattering; the main transmitting and receiving lens receives an echo signal reflected by the cloud formation; the echo signal is reflected to the filter for filtering through the reflection region and is incident to the photodetector, thereby improving the measurement precision ofthe laser radar optical system effectively.

The invention provides a kick control method and system of an automobile electric stern door. The method includes the steps that a first kick sensor is arranged and used for detecting a kick action atthe first height and generating a first waveform according to the kick action at the first height; a second kick sensor is arranged and used for detecting a kick action at the second height and generating a second waveform according to the kick action at the second height; a first rising edge gradient and a first falling edge gradient are obtained through calculation according to the first waveform, and a second rising edge gradient and a second falling edge gradient are obtained through calculation according to the second waveform; and if the difference value of the first rising edge gradient and the second rising edge gradient is smaller than a set threshold value, and the difference value of the first falling edge gradient and the second falling edge gradient is smaller than a set threshold value, a kick induction controller sends a kick stern door opening request signal, so that the vehicle stern door is opened. The use intelligence of an automobile can be improved, and the comfort feeling of a user is improved.

An atmospheric cloud height, humidity profile, or temperature measuring method and arrangement are provided. In the method, pulsed laser signals (14) are transmitted through transmission optics (2, 3, 4, 5, 6) to the atmosphere and the signal (15) reflected or scattered back from there is detected. An interference filter (3) is used in the optics, in order to stabilize the transmitted optical power to the centre wavelength of the interference filter (3).

The invention discloses a device and a method for measuring a to-ground height of an unmanned aerial vehicle in the field of electronic information, and belongs to the technical field of electronic information. The device comprises a central processing unit, wherein the central processing unit is electrically connected with a distance collecting system and an unmanned aerial vehicle state collecting system in an input manner respectively; the central processing unit is electrically connected with a wireless transmission system, a control system and a display system in an output manner respectively. According to the device and the method, a locating image frame is collected through an optical-flow camera in the distance collecting system; an ultrasonic generator measures the to-ground distance; a distance value and the pixel of the image frame are comprehensively compared and analyzed; the locating coordinate of an aircraft is obtained; the accurate measurement of the to-ground height is obtained; the electric quantity, the failure and the signal intensity of the unmanned aerial vehicle are detected through the unmanned aerial vehicle state collecting system; a control background masters the flight state of the unmanned aerial vehicle in real time; the control information of a controller is transmitted to the unmanned aerial vehicle through the wireless transmission system so as to control the unmanned aerial vehicle.

A nighttime imaging cloud-height measuring method comprises the steps of: 1. arranging an image collector and a laser source respectively at a certain interval and leading lens optical axis of the image collector and optical axis of the laser source to be vertical to the horizontal plane; 2. opening the laser source and simultaneously adopting the image collector to collect imaging plane of a laser beam; 3. respectively selecting the focus of the image collector as B, the launching point of the laser source as C and the top point of laser beam as A; and selecting one point on the lens optical axis of the image collector as E and leading the line section between the point A and the point E to be parallel with the line section between the point B and the point C; and respectively finding subpoint A' of point A and subpoint E' of E on the imaging plane and measuring the distance A'E' between the subpoint A' and the subpoint E'; and 4. calculating cloud-height according to a formula: AC equals E'B multiplied by BC / A'E'. The method has the advantages of simple measuring steps and accurate measuring result. The nighttime imaging cloud-height measuring method can solve the cloud-height measurement with lower cost and is applicable to cloud-height measurement of various cloud layers.

An evacuation slide comprises a sliding face having a top end portion adapted to be positioned adjacent to an exit of a region to be evacuated, and a bottom end portion adapted to be positioned adjacent to an escape route leading away from, and at a lower height, than the region. The sliding face, at the top end portion, comprises a flat porch section connected to an inclined section of the sliding face via a transition section. The sliding face has at least one of a first guidance marking placed in the flat porch section and having a shape and orientation adapted indicate a predefined evacuation direction in the inclined section of the sliding face and a second guidance marking placed in the transition section and having a shape and orientation adapted to indicate a separation between the flat porch section and the inclined section.

An image processing device which is capable of accurately detect pixels covered by cloud shadows and remove effects of the cloud shadows in an images are provided. The device includes: a cloud transmittance calculation unit that calculates transmittance of the one or more clouds in an input image, for each pixel; a cloud height estimation unit that determines estimation of a height from the ground to each cloud in the input image to detect position of corresponding one or more shadows; an attenuation factor estimation unit that calculates attenuation factors for the direct sun irradiance by applying an averaging filter to the cloud transmittance calculated; and a shadow removal unit that corrects pixels affected by the one or more shadows, based on a physical model of a cloud shadow formation by employing the attenuation factors calculated and the position, and outputs an image which includes the pixels corrected.

The invention designs a rotary type laser ceilometer for observing cloud amount. A fixed zenith angle is changed into a rotary transmitting and receiving system in a certain three-dimensional space angle, and clouds at different positions are sampled. The rotary type laser ceilometer can increase sampling on the clouds in the sky so as to improve the observation precision of the cloud amount; and one set of the laser ceilometer is utilized to realize the observation of two basic parameters including a cloud height and the cloud amount. The rotary type laser ceilometer comprises a laser transmitting system and a laser receiving system; the laser transmitting system comprises a laser device and a beam expander; the laser receiving system comprises a telescope, a convex lens, a narrow-band filtering sheet and a photomultiplier; the convex lens, the narrow-band filtering sheet and the photomultiplier are mounted in a lens cone of the telescope; the laser device and the beam expander are mounted on the outer wall of the lens cone of the telescope; the rotary type laser ceilometer further comprises a bottom bracket, a rotary shaft, a first motor and a second motor; the lens cone of the telescope is fixedly connected with the rotary shaft; the two ends of the rotary shaft are erected in the bottom bracket through a bearing seat; the rotary shaft is in transmission connection with the first motor and the first motor is mounted on the bottom bracket; and the bottom bracket is in transmission connection with the second motor.

An atmospheric cloud height, humidity profile, or temperature measuring method and arrangement are provided. In the method, pulsed laser signals (14) are transmitted through transmission optics (2, 3, 4, 5, 6) to the atmosphere and the signal (15) reflected or scattered back from there is detected. An interference filter (3) is used in the optics, in order to stabilize the transmitted optical power to the center wavelength of the interference filter (3).

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.