35 results about "Cloud base height" patented technology

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.

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.

The present invention provides a cloud scattering error correction method and device for a laser altimeter, wherein the method includes: acquiring echo waveform data of the altimetry laser, the echo waveform data including echo power at different altitudes; calculating Raw altimetry data; calculate backscatter coefficient and extinction coefficient at different altitudes according to echo power; calculate cloud top height and cloud base height according to backscatter coefficient; calculate attenuation coefficient according to backscatter coefficient and extinction coefficient; calculate cloud top height according to cloud top height , cloud base height, and attenuation coefficient to calculate the cloud optical thickness; calculate the altimetry deviation correction value based on the cloud optical thickness and the altimetry deviation model caused by atmospheric scattering; calculate the corrected altimetry data based on the original altimetry data and the altimetry deviation correction value. This method not only can quickly calculate the height measurement deviation correction value, but also the calculated height measurement deviation correction value is relatively accurate.

The invention provides a method and device for predicting the arrival and departure rate of flights. The method includes classifying the meteorological conditions of the airport according to the cloud base height and visibility, and establishing the first arrival rate function model and the first Departure rate function model; according to the historical data set of the airport, and using the opportunity constraint optimization model to optimize the first arrival rate function model and the first departure rate function model, the second arrival rate function model and the first departure rate function model of the flight are established. Two departure rate function models; obtain the current meteorological conditions of the airport, select the corresponding second arrival rate function model and the second departure rate function model under the current weather conditions; obtain the predicted arrival rate and predicted departure rate of airport flights . The invention establishes a flight arrival and departure rate function model on the basis of the airport historical data set, and can accurately predict the flight arrival and departure rate.

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.

The invention discloses a method for quickly determining the cloud reflectance applicable to the oxygen A zone, the method comprising the following steps: 1) obtaining the solar zenith angle θ during satellite observation; 2) setting the cloud attributes required for calculating the cloud reflectance, Including cloud optical thickness, cloud top height and cloud base height; 3) divide the spectral range of the oxygen A band to be calculated into multiple wavelength sequences; 4) calculate the cloud reflectance wavelength by wavelength for the divided wavelength sequences; 5) divide The calculated reflectances of clouds are arranged in ascending order of their corresponding wavelengths. The invention proposes a simplified calculation model of the cloud reflectance, and calculates the reflection of the cloud layer on each spectrum. The time-consuming calculation of cloud reflectance is shortened, the calculation pressure is reduced, the speed of single data processing is accelerated, and the cost of single satellite data is reduced.