65 results about "Sea ice thickness" patented technology

The invention relates to implementation of a sea ice parameter extraction method on the basis of a satellite image and a system and belongs to the technical field of computer application. The sea ice parameter extraction method on the basis of the satellite image is characterized in that an algorithm of eliminating warp and weft noise by the satellite image is implemented; image element types are accurately identified and classified; and a land and sea ice boundary and a sea ice and seawater boundary are extracted by a boundary tracing algorithm. On the basis, three parameters, i.e. the sea ice intensity, the sea ice thickness and the sea ice size, in the satellite image are calculated; and a user opens the image at a computer terminal and carries out the operations of preprocessing the image, identifying key elements (sea ice, land, seawater), describing the boundaries, extracting the sea ice parameters and storing a data result. The extraction method is reasonable, efficient and accurate and strong in scientificity; and the system is regular in design, high in reliability and user-friendly.

The invention relates to a method for calculating sea ice thickness based on hyperspectral remote sensing reflectance. The method comprises the following steps of selecting the ratio of remote sensing reflectance of different wavelengths and functions as the characteristics of determining the sea ice thickness according to the different thicknesses of sea ice hyperspectral remote sensing reflectance; building a sea ice thickness calculation model to obtain the sea ice thickness; aiming at an aerial hyperspectral image containing sea ice, firstly, utilizing the ratio of digital quantization values of an image to identify a sea ice picture element; carrying out radiation correction and atmospheric correction on the digital quantization values of the image according to the common aerial hyperspectral image processing method to obtain the hyperspectral remote sensing reflectance of the sea ice picture element; and finally substituting into the sea ice thickness calculation model, and calculating the thickness of the sea ice picture element. The model disclosed by the invention is simple; and only remote sensing reflectance Rrs of finite wavelengths is selected. Therefore, sea ice thickness calculation of the sea ice remote sensing reflectance measured by a spectroradiometer is achieved, and calculation of the sea ice thickness by the aerial hyperspectral remote sensing image is also achieved.

The invention provides an optimal decision method and an optimal decision system for power transmission line ice disasters. The optimal decision method includes acquiring power transmission line icing thicknesses and increasing icing thicknesses within a period of time; computing by combining the power transmission line icing thicknesses and the increasing icing thicknesses with a power transmission line design ice thickness so as to obtain icing degrees of power transmission lines, acquiring importance degrees of the power transmission lines according to voltage grades of the power transmission lines and importance degrees of power transmission line sections, and acquiring power transmission line icing difficulty coefficients according to deicing equipment configured for the power transmission lines, a deicing scheme formulated for the power transmission lines and the voltage grades of the power transmission lines; screening the power transmission lines needing to be deiced according to the icing degrees of the power transmission lines, conducting priority ranking of the power transmission lines needing to be deiced by integrating the icing degrees, the importance degrees and the deicing difficulty coefficients of the power transmission lines, and deicing according to the priority. The optimal decision method and the optimal decision system for the power transmission line ice disasters have the advantages that emergency disposal strategies for the power transmission line ice disasters can be formulated, and emergency disposal effects and benefits of the power transmission line ice disasters are improved.

The invention discloses a proposed overhead power transmission line icing monitoring method, which comprises the steps that A, the wind speed V<wind>(m / s), weight reading T1(g)+T2(g) after a simulation wire being covered by ice, the length L<wire>(m) of the simulation wire, the diameter d<wire>(mm) of the simulation wire, the weight per unit length g<wire>(g / m) of the simulation wire, the ground height h<wire>(m) of the simulation wire, the actual icing thickness r<ice>(mm) of the simulation wire and a horizontal included angle theta (degree) between the wind direction and the simulation wire are acquired; B, the actual icing weight G<ice>(g) of the simulation wire is calculated through simultaneous formulas; and C, the standard ice thickness B0(mm) on the simulation wire is calculated according to a formula shown in the description of the invention. The proposed overhead power transmission line icing monitoring method can accurately measure the standard ice thickness on the simulation wire of a proposed overhead power transmission line, and can provide a reasonable and accurate ice region magnitude and other design meteorological conditions for power transmission line design.

The invention belongs to the technical field of ship and ocean engineering, and relates to a sea ice thickness identification system suitable for ship ice area sailing test, in particular to an image acquisition device for a sea ice overturning process of a ship in an ice area sailing process and an automatic identification method for sea ice thickness parameters in an image. The image acquisition device comprises a black and white binocular camera, an infrared range finder, a graphic processor, a display screen and a data switch. According to the invention, the video image information of the sea ice cross section can be captured, the sea ice thickness parameter with the delay lower than 1 second and the precision reaching centimeter can be obtained, and the calibration problem of the sea ice image is solved.

The invention relates to a sea ice information extraction method, which comprises the following steps of: preprocessing acquired photon data, further classifying sea ice information in combination with a calculation result, calculating a sea ice freeboard height value according to a classification condition, optimizing an existing accumulated snow depth measurement model result, and according to other sea ice information parameters, calculating the sea ice thickness value by combining the Archimedes law, a linear regression function and other calculation formulas. Compared with the prior art, after the satellite initial data are corrected, subsequent processing and screening are carried out by using relatively accurate data, the data are further limited, and the utilization rate of the data is improved.

The invention discloses an icing detection and early warning device for transmission lines, which performs filter edge detection on image information collected by a camera transmitted through a network, and records the coordinates of boundary contour points in the image through binarization processing and boundary tracking. Finally, by comprehensively comparing the coordinates of the boundary points before and after the transmission wire, and using the diameter of the transmission wire to calibrate, the ice thickness of the transmission wire at that time is obtained; data analysis is performed according to the micro-meteorological parameters collected by the data acquisition module, supplemented by the wire within the set time period Tension trend chart and ice thickness change trend chart, combined with the stored historical ice thickness, according to the meteorological parameter conditions that are easy to form ice, the line design ice thickness and the measured ice thickness will affect the ice situation in the next three to five years. The thickness of the ice cover is predicted and an early warning signal is issued. The invention realizes on-line detection of the icing of the power transmission line, and at the same time can perform dynamic early warning, and timely analyze and early warning of the icing information.

The invention belongs to the technical field of ocean tide measurement, and discloses a polar region ice region ocean tide measurement buoy, a measurement method and application, and the polar region ice region ocean tide measurement buoy comprises a buoy body; the Beidou navigation positioning system is mounted on the buoy body and used for determining geocentric three-dimensional coordinates of the buoy body on the ice surface; and the ice penetrating radar is mounted on the buoy body and is used for measuring the distance from an antenna to the ice surface and the sea ice thickness. The Beidou navigation and positioning system comprises a north pole satellite navigation and positioning signal receiver and a GNSS antenna, and the GNSS antenna is installed on the north pole satellite navigation and positioning signal receiver and used for receiving signals of three frequency points of the L frequency band. The device and the method can be suitable for polar ice zone tide measurement, observation errors caused by sea ice can be corrected, and the equipment cost is also remarkably reduced.

The present invention discloses a pulse system radar sea ice detection capability assessment method. About a pulse system radar, the pulse signal width of the pulse system radar is [Tau], the electromagnetic wave propagation speed of the pulse system radar is c0, and the detectable sea ice thickness limited by pulse width is (img file='DDA0001266953770000011. TIF' wi='349' he='93' / ), wherein c0=3*108m / sec, and [Theta]2 is an electromagnetic wave transmission angle in sea ice. The sea ice identification resolution is expressed by Dice, the physical significance is the discriminating degree of a sea ice area and a seawater area in a radar scattering image, and the sea ice identification resolutions when horizontal polarization and vertical polarization are (img file='DDA0001266953770000012. TIF' wi='484' he='109' / ) and (img file='DDA0001266953770000013. TIF' wi='485' he='111' / ). Based on the sea ice dielectric constant model, the pulse system radar sea ice detection capability assessment method considers multi-time scattering of electromagnetic waves between an air-ice interface and a sea water-sea ice interface, and the assessment factors are sea ice detection thickness and the sea ice identification resolution.

The invention discloses an icing thickness detection method for a power transmission line icing image based on deep learning, belongs to the field of digital image recognition, and aims at solving problems that the sensitivity and reliability of conventional tension monitoring are not high and improving the icing thickness monitoring accuracy and automation degree of a power transmission line. The method is used for the icing thickness monitoring and over-range warning for a system power transmission line, and comprises the steps: (1), collecting an icing image; (2), carrying out the preprocessing of an image, and building a data set; (3), building a convolution neural network; (4), carrying out the training and testing of a model; (5), extracting the icing thickness information, and transmitting the icing thickness information to a control center. The method introduces a digital image feature recognition method to the icing thickness detection of a power transmission and a tower, automatically extracts the thickness information through employing the icing shape features in the image, formulates a deicing plan for an operation and maintenance worker, and provides a new visual and intelligent solution for the safe and stable operation of a power system.