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23 results about "Earth's rotation" patented technology
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Earth's rotation is the rotation of Planet Earth around its own axis. Earth rotates eastward, in prograde motion. As viewed from the north pole star Polaris, Earth turns counterclockwise. The North Pole, also known as the Geographic North Pole or Terrestrial North Pole, is the point in the Northern Hemisphere where Earth's axis of rotation meets its surface. This point is distinct from Earth's North Magnetic Pole. The South Pole is the other point where Earth's axis of rotation intersects its surface, in Antarctica.
Optical satellite drift angle accurate calculation and attitude correction method and system
The invention discloses an optical satellite drift angle accurate calculation and attitude correction method and system, and relates to the technical field of satellite attitude control, and the method comprises the steps: calculating a prime unitary circle curvature radius according to a WGS84 ellipsoid parameter, and converting the geodetic coordinate of a ground target point into an ECEF rectangular coordinate; calculating Julian days based on UTC time, determining an age difference angle and a nutation angle, and converting an ECEF coordinate into a J2000 coordinate; calculating the projection of the earth rotation angular velocity in a J2000 coordinate system, and determining a relative velocity vector; determining an orthogonalized body coordinate system in combination with a unit vector from the target satellite to the ground target point; and projecting the relative velocity vector to a body coordinate system, calculating a drift angle and a double-rotation-sequence Euler angle, and correcting a real-time execution attitude by rotating a matrix around a Z axis. According to the method, high-precision image motion compensation can be realized, the imaging quality of a high-resolution optical satellite in a complex task scene is improved, and a technical foundation is laid for wide application of sub-meter remote sensing images.
Owner:BEIJING WEINA STAR TECH CO LTD +2
Earth rotation parameter prediction method based on least square and long short-term memory network
ActiveCN119939101BBiological modelsComplex mathematical operationsData transformationEarth's rotation
The present application relates to the technical field of geophysics, and particularly relates to a method for predicting earth rotation parameters based on least squares and long short-term memory network, comprising: collecting and preprocessing basic sequence data of earth rotation and effective angular momentum data; converting the preprocessed basic sequence data of earth rotation into geodetic angular momentum; fitting the effective angular momentum data and the geodetic angular momentum to obtain fitted sequences and residual sequences of the effective angular momentum and the geodetic angular momentum respectively; inputting the residual sequences of the effective angular momentum and the geodetic angular momentum into a long short-term memory network model to obtain error terms of the effective angular momentum and the geodetic angular momentum; and integrating the fitted sequences of the effective angular momentum and the fitted sequences, the error terms of the effective angular momentum and the geodetic angular momentum to obtain a prediction result of the earth rotation parameters. Thus, the problems that the traditional earth rotation parameter prediction method is difficult to capture the complex nonlinear characteristics in the change of the rotation parameters are solved.
Owner:WUHAN UNIV
Method for determining altitude height in combination with GNSS frequency signal of Chinese space station
ActiveCN120539761BHeight/levelling measurementSatellite radio beaconingEarth's rotationCarrier signal
The present application relates to the field of geodetic surveying, and particularly relates to a method for determining altitude based on GNSS frequency signals of Chinese space station. Through obtaining data such as GNSS satellite precise orbit, clock error and earth rotation parameters from IGS analysis center, RINEX format data is obtained by using synchronous observation of space station and ground station receiver, and the gravity potential of space station observation moment is determined in combination with EIGEN-6C4 gravity field model. The frequency observation value is derived from the carrier phase observation value, the observation equation is established in the dual-frequency ionosphere elimination processing mode, the gravity potential difference between space station and ground station is solved, and finally the gravity potential and altitude of ground station are obtained. The present application can replace the traditional leveling and gravity measurement, significantly reduce the cost, overcome the environmental restriction, and support the cross-sea and cross-ocean height transfer and the global height datum unification.
Owner:CHUZHOU UNIV
Satellite on-board orbit transfer method and system
This invention provides a satellite onboard orbit conversion method and system. The method includes: calculating the corrected Julian day at the current time and calculating the Greenwich Mean Sidereal Time Angle based on the corrected Julian day; converting the Greenwich Mean Sidereal Time Angle into radians; calculating the Earth rotation matrix from the J2000 system to the WGS84 system based on the converted radians; pre-calculating the Earth nutation and precession correction matrices as modifiable parameters for satellite commands and updating them periodically; calculating the conversion matrix from the J2000 system to the WGS84 system based on the Earth nutation and precession correction matrices and the Earth rotation matrix; and calculating the satellite position and velocity in the WGS84 system based on the conversion matrix, thereby realizing the satellite onboard orbit conversion. This invention addresses the need for converting EP satellite onboard orbit information from an inertial frame to the WGS84 coordinate system, meets the requirements for short message stand-alone operation, and can provide a reference for on-orbit conversion of other satellites.
Owner:INNOVATION ACAD FOR MICROSATELLITES OF CAS +1
Azimuth detection method, azimuth detection device, and surveying device
To provide a compact and easy-to-use azimuth detection method, azimuth detection device, and surveying device. [Solution] The system includes a sensor unit 7 that detects tilt and rotation relative to the horizontal, and a flywheel 18 provided on the sensor unit that has a rotation axis extending in the vertical direction. The flywheel is rotated at a constant speed, and the flywheel is tilted to generate a gyroscopic moment in order to counteract the change in tilt that occurs in accordance with the rotation of the Earth, and the direction of the Earth's axis (north or south) can be determined from the direction of the gyroscopic moment.
Owner:TOPCON CORPORATION
Method for determining an azimuth angle between a sensitive axis of a quantum-based NMR gyroscope and a geographic north direction, and gyrocompass
The invention relates to a method for determining an azimuth angle (α) between a sensitive axis (z) of a quantum-based NMR gyroscope (100) and a geographic north direction (N), the method comprising aligning the sensitive axis (z) of the quantum-based NMR gyroscope (100) in a first measurement direction, which in particular runs substantially parallel to an Earth's surface, and determining a first Earth rotation (ω). R ), aligning the sensitive axis (z) of the quantum-based NMR gyroscope (100) in at least one second measurement direction, which in particular is essentially parallel to the Earth's surface and which differs from the first measurement direction, and determining at least one second Earth rotation, and determining the azimuth angle (α) from the first Earth rotation (ω) R ) and at least one second Earth rotation. The invention further relates to a gyrocompass (10).
Owner:ROBERT BOSCH GMBH
Method for eliminating rotational flow of submersed nozzle
According to the method, the geophysical effect and the continuous casting process are correlated for the first time, Coriolis force is actively counteracted through the rifling structure, and the traditional thought that only a local flow field is optimized is broken through. A zero-energy-consumption solution is provided, flow field correction is achieved through a pure mechanical structure, the continuous spiral rifling structure is arranged on the inner wall of the nozzle body, the earth rotation Coriolis force effect of a hemisphere where a pouring position is located is counteracted, and the crystallizer flow field is stabilized.
Owner:SHANXI TAIGANG STAINLESS STEEL CO LTD
Method for calculating time window of agile satellite earth observation
The application discloses a kind of agile satellite earth observation time window calculation method, belongs to satellite earth observation technical field.The present application is in view of the method for calculating agile satellite earth observation time window by orbit recursion in the prior art, it is difficult to realize the problem of long time mission planning in orbit due to large amount of calculation.Six numbers of orbit and flight time are considered according to the orbit of earth observation satellite, and orbit recursion is carried out considering J2 perturbation, the position vector is converted into geographical longitude and latitude considering the influence of earth rotation, and the analytical expression of subsatellite point trajectory about time is established;According to the expression of satellite subsatellite point trajectory, the time when the latitude of ground target is equal is screened out, and whether the relative distance constraint is satisfied at this time is judged, so as to estimate the time when the observation condition is met;The observation attitude angle is calculated according to the relative position vector of satellite pointing target, the maximum roll angle and pitch angle constraint are considered, and the over-the-top time and observation time window are iteratively solved near the estimated time.The application is used to calculate satellite earth observation time window.
Owner:HARBIN INST OF TECH
Huang daozhou transformer
At present, the world is suffering from air pollution due to thermal power generation, sea level rise due to atmospheric temperature rise, land sinking due to rising of the sea level, and public nuisance due to nuclear power generation, such as spent depleted uranium, plutonium, and.gamma.-ray radioactive materials. In order to solve these problems, inexhaustible visible-light wave power generation of sunlight radiation energy and a Huang Daozhou converter are integrated.SOLUTION: The secondary coil of the ecliptic transformer according to the present invention may be connected to a country having a shortage of electric power at night due to the rotation of the earth and a country having a shortage of electric power due to a large amount of power consumption even in the daytime via the shortest conductor on the same longitude to transmit and receive electric power.SELECTED DRAWING: Figure 1
Owner:渡边 辉男
Astronomical globe
Owner:杭州鹏龙科技有限公司
Astronomical rough north introduction method based on fixed star apparent movement speed
The invention discloses an astronomical rough north guiding method based on fixed star apparent movement speed, which comprises the following steps: measuring an azimuth angle and an elevation angle of an observed star in an east-north-sky coordinate system of a measuring point during observation as thetadir and thetah respectively, and a latitude thetalat of the known measuring point; the cosine of the included angle between the vector of the observed star and the rotation axis can be obtained according to the point product of the vector of the observed star and the vector of the rotation axis; measuring the average angular velocity of the observed star during observation, and obtaining the sine value of the included angle delta theta se between the vector of the observed star and the rotation axis of the earth according to the ratio of the average angular velocity to the rotation speed of the earth; performing closed-form solution on the azimuth angle theta dir according to the azimuth angle theta dir; the azimuth angle of the due north direction is 0 degree, the orientation of the due north direction is speculated according to the azimuth angle theta dir, the method is simple in equipment, and celestial body observation can be used as a rough north seeking mode.
Owner:BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH
Satellite ground point calculation method based on SGP4 orbit model
PendingCN122174469ADesign optimisation/simulationComplex mathematical operationsEarth's rotationLongitude
This invention discloses a method for calculating the sub-satellite point based on the SGP4 orbital model, relating to the field of satellite navigation and orbit prediction technology. The polar spherical projector of this invention eliminates longitude jumps in latitude >75°, ensuring continuous trajectory output for scenarios such as polar scientific expeditions and glacier monitoring. By directly mapping three-dimensional radial information to generate latitude, it avoids the iterative convergence problem of the ellipsoidal model, ensuring natural symmetry of the North and South Poles coordinates and continuous longitude domain. Second-order differential compensation of the mean anomaly angle, combined with dynamic correction of the Earth's rotational angular velocity, strictly aligns the UTC timestamp with the orbital position. It suppresses the cumulative error generated by traditional linear interpolation at perigee. It enhances adaptability to complex perturbation environments; atmospheric drag vectorization compensation captures real-time aerodynamic direction through relative velocity cross terms, combined with continuous processing of the density index model, significantly improving the orbital attenuation prediction accuracy of low-Earth orbit satellites during geomagnetic storms.
Owner:BEIJING CREATUNION INFORMATION TECH CO LTD
Method and system for determining regression period of heterogeneous orbit constellation configuration
The invention provides a heterogeneous orbit constellation configuration regression period determination method and system, and the method comprises the steps: finding a group of coprime operation turns and regression number for each satellite, and enabling the operation turns and the regression number to meet the condition that the ratio of the operation turns to a first set parameter is equal to the ratio of the regression number to a second set parameter, the regression period of the satellite can be obtained; wherein the first set parameter is the sum of the average change rate of the perigee argument and the average change rate of the mean anomaly; the second set parameter is the difference between the earth rotation angular velocity and the right ascension precession rate of the ascending node; and calculating the least common multiple of the time periods of all satellites to obtain the regression period of the constellation. The method has the advantages that compared with a traditional method, the efficiency is improved by 13.3% when compatibility analysis is carried out on the regression cycle calculated through the method, and the maximum interference level in the regression cycle is consistent with that of annual simulation.
Owner:NAT SPACE SCI CENT CAS
Method and system for electric power generation from earth's rotation through its own magnetic field
PendingUS20260128689A1Computer controlInorganic material magnetismEarth's rotationConductive materials
In various aspects, a power-generating device is provided. The power-generating device may include a three-dimensional structure. The three-dimensional structure may be composed of a conductive material having (i) a magnetically permeable material having a topology that alters Earth's magnetic field such that curl (v×B)≠0, where v is Earth's velocity of rotation and B is the component of Earth's magnetic flux density symmetric about Earth's axis of rotation and (ii) a magnetic Reynolds number less than ten (Rm<10). The three-dimensional structure may be configured to generate power and heat when carried with Earth's rotation via Earth's axially symmetric non-rotating magnetic field.
Owner:CHYBA CHRISTOPHER F +2
Method for evaluating access capability of artificial satellite to targets at different latitudes on ground
PendingCN121902388ADesign optimisation/simulationComplex mathematical operationsEarth's rotationPhysical model
The invention discloses a method for evaluating the access capability of an artificial satellite to ground targets at different latitudes. Belongs to the field of aerospace dynamics and artificial satellite orbits. The method is based on mathematical modeling, main features of an orbit dynamics physical model are extracted, and the access capability of a satellite constellation to a ground specified latitude target is rapidly evaluated with low calculation cost, including the number of access windows and the total access duration in a given time period. According to the method, satellite motion is simplified into an elliptical orbit dominated by two-body gravitational force, and a static annulus model formed by projection of a satellite side-sway range on the earth surface is introduced; by analyzing the geometrical relationship and the time characteristic that a ground target passes through the annulus along with earth rotation, and combining a satellite orbit period and an earth rotation period, an analytical expression of the access probability, the window number and the time length is deduced. The method can effectively estimate the distribution of the access capability along with the latitude, does not need a large amount of numerical simulation, and remarkably improves the calculation efficiency.
Owner:CHANGGUANG SATELLITE TECH CO LTD
Satellite-ground one-way distance correction method considering earth rotation
ActiveCN116699536BHigh precisionWave based measurement systemsHigh level techniquesDistance correctionEarth's rotation
The application provides an on-orbit satellite-ground one-way distance correction method considering the rotation of the earth, and the measuring equipment used comprises: an on-orbit satellite and a ground station; a distance correction module is added in the satellite-ground distance measuring system of the ground station, which comprises: a satellite-ground distance measuring model is established in the satellite-ground distance measuring system of the ground station without considering the rotation of the earth, and the satellite-ground distance without considering the influence factors of the rotation of the earth is obtained by using a relay ranging method; the projection of the displacement of the ground station along the satellite-ground connecting line caused by the rotation of the earth is calculated according to the rotation speed of the earth and the geographical latitude where the satellite-ground station is located; the asymmetric satellite-ground distance is corrected by using the projection distance correction, and high-precision satellite-ground one-way distance is obtained.
Owner:CHINA XIAN SATELLITE CONTROL CENT
Azimuth detection method and device
PendingCN121363951ANavigational calculation instrumentsNavigation by speed/acceleration measurementsGyroscopeEarth's rotation
The invention provides an orientation detection method and device, relates to the technical field of inertial measurement, and is used for determining an orientation by using a gyro north seeker. The method comprises the following steps: acquiring first azimuth information; determining a first direction, a second direction, a third direction and a fourth direction according to the first azimuth information; wherein the first direction is the direction corresponding to the east direction minus the preset degree, the second direction is the direction corresponding to the east direction plus the preset degree, the third direction is the direction corresponding to the west direction minus the preset degree, and the fourth direction is the direction corresponding to the west direction plus the preset degree; the preset degree is smaller than 90 degrees. And determining the earth rotation angular velocity measured under the condition that the gyroscope rotates to the first direction, the second direction, the third direction and the fourth direction respectively. According to the first angular velocity, the second angular velocity, the third angular velocity and the fourth angular velocity, second azimuth information is determined, and the second azimuth information is used for indicating the current azimuth.
Owner:HUAWEI TECH CO LTD
Atomic interference gyroscope scale factor calibration method based on ground velocity excitation
The invention discloses a ground velocity excitation-based atomic interference gyroscope scale factor calibration method, which comprises the following steps of: firstly, obtaining an actual measurement value corresponding to an atomic interference gyroscope scale factor according to an earth rotation fitting experiment, establishing a linear model of an input / output relationship of an atomic interference gyroscope, and calculating the scale factor of the atomic interference gyroscope by changing the direction of an inertial measurement unit in a horizontal plane; synchronously recording the output phase of the triaxial cold atom interference gyroscope, obtaining the excitation of the corresponding earth rotation angular velocity to the three axes of the cold atom interference gyroscope according to the excitation of the earth rotation angular velocity to the atom interference gyroscope, and simultaneously obtaining the scale factors of the three gyroscopes of the inertial measurement unit by utilizing least square fitting; according to the method, the calibration factors of the atomic interference gyroscope and the triaxial atomic interference gyroscope in the inertial measurement unit can be synchronously calibrated, and the requirement of the inertial measurement unit based on the cold atom interference gyroscope on calibration conditions during calibration at the present stage is reduced.
Owner:CENT CHINA OPTOELECTRONICS TECH RES INST (CHINA STATE SHIPBUILDING CORP 717TH RES INST)
Device for judging motion balance state of object based on attractive force and magnetic force
PendingCN121435474ADesign optimisation/simulationComplex mathematical operationsMagnetic tension forceCircular disc
The embodiment of the invention provides a device for judging the motion balance state of an object based on attractive force and magnetic force, which analyzes the interaction among a plurality of objects in periodic motion, particularly uniform circular motion, based on the attractive force and magnetic force, so as to predict the information of the objects, such as the motion direction, the motion plane and the motion period when the objects reach the balance state. In a specific embodiment, the formation reason of a galaxy disc shape is analyzed, the inclination angle of earth rotation is calculated, and the possibility of developing a corresponding gravitational magnetic device by referring to an existing electromagnetic device is analyzed.
Owner:丘桐文
Closed-loop celestial body tracking and photographing method and system based on real-time analysis of starry sky image
This invention discloses a closed-loop celestial object tracking and imaging method and system based on real-time analysis of starry sky images. The invention identifies celestial objects from starry sky images and calculates imaging parameters; based on Earth rotation data and current field-of-view parameters, it calculates the instantaneous linear drift velocity and field rotation angular velocity of the celestial object to be tracked on the image sensor plane. The long-exposure drive signal is compensated based on the calculated instantaneous linear drift velocity and field rotation angular velocity of the current frame and adjacent frames to counteract star point drift during the long exposure process. Alternatively, by calculating the relative displacement and rotation angle between adjacent frames and the current frame in consecutive short-exposure images, each subsequent frame is aligned, and all frames are pixel-level superimposed to synthesize the final long-exposure image. This invention achieves significant simplification in hardware cost and structure, requiring only one imaging unit to complete high-precision pointing calculation and drift compensation.
Owner:HANGZHOU INDEX STAR TECHNOLOGY CO LTD
A method for joint calculation of Earth rotation parameters and short-term forecasting by regional network satellite-ground inter-satellite systems
This invention proposes a method for joint calculation of Earth rotation parameters and short-term forecasting using regional network satellite-ground-satellite joint methods, belonging to the field of satellite navigation technology. This invention utilizes satellite-ground observation data from a limited number of regional stations, along with inter-satellite link measurement data, to perform joint orbit determination and ERP parameter calculation. Considering the limited amount of accumulated ERP data, a real-time short-term ERP forecasting method based on historical calculations is employed, and the method is compared with IERS CO4 for accuracy evaluation.
Owner:SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI +2
A method, device and electronic equipment for measuring relative changes in attitude based on MEMS
The application provides a method and device for measuring relative changes in attitude based on MEMS, electronic equipment and a recording medium, the method comprising: obtaining original data, pre-filtering the original data; estimating an initial value of zero offset of the MEMS gyroscope according to the working environment of the carrier; measuring an initial value of attitude by using the output of the accelerometer according to the original data after the pre-filtering; decomposing the output of the gyroscope into a horizontal plane and a vertical direction by using the measured attitude, calculating a real-time azimuth angle of the MEMS; compensating the real-time azimuth angle of the MEMS with the sky component of the earth rotation angular velocity in each calculation period according to the latitude L of the carrier; judging the motion state of the MEMS, updating the measured attitude in real time when the motion state is dynamic, and not updating the measured attitude when the motion state is static; and when the MEMS is judged to be static, performing average operation on the gyroscope data in a period of time, and compensating the average operation to the MEMS gyroscope as zero offset.
Owner:BEIJING KETIANHONGRI TECH CO LTD
Method and system for electric power generation from earth's rotation through its own magnetic field
PCT designated stageWO2026101596A1Computer controlCosmonautic propulsion system apparatusEarth's rotationConductive materials
In various aspects, a power-generating device is provided. The power-generating device may include a three-dimensional structure. The three-dimensional structure may be composed of a conductive material having (i) a magnetically permeable material having a topology that alters Earth's magnetic field such that curl (v x B)≠0. where v is Earth's velocity of rotation and B is the component of Earth's magnetic flux density symmetric about Earth's axis of rotation and (ii) a magnetic Reynolds number less than ten (R m < 10). The three-dimensional structure may be configured to generate power and heat when carried with Earth's rotation via Earth's axially symmetric non-rotating magnetic field.
Owner:CHYBA CHRISTOPHER F