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34 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.
Method for measuring altitude in combination with GNSS frequency signal of Chinese space station
ActiveCN120539761AHeight/levelling measurementSatellite radio beaconingEarth's rotationCarrier signal
The invention relates to the technical field of geodetic survey, in particular to a method for measuring the altitude based on GNSS frequency signals of a Chinese space station. Data such as GNSS satellite precision orbits, clock errors and earth rotation parameters are obtained from an IGS analysis center, RINEX format data are obtained through synchronous observation of a space station receiver and a ground station receiver, and the gravity potential of the space station at the observation moment is determined in combination with an EIGEN-6C4 gravity field model. Deriving a frequency observation value from the carrier phase observation value, establishing an observation equation in a double-frequency ionosphere elimination processing mode, resolving the gravity potential difference between the space station and the ground station, and finally obtaining the gravity potential and the altitude of the ground station. According to the invention, traditional leveling and gravity measurement can be replaced, the cost is obviously reduced, the environmental limitation is overcome, and cross-sea and cross-ocean elevation transmission and global elevation datum unification are supported.
Owner:CHUZHOU UNIV
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
Radar satellite three-dimensional attitude guiding method and system
PendingCN120576751ANavigational calculation instrumentsInstruments for comonautical navigationEarth observationEarth's rotation
The invention provides a radar satellite three-dimensional attitude guiding method and system, and the method comprises the steps: calculating the geocentric distance and geocentric latitude and longitude of a satellite according to satellite orbit parameter information, calculating the height of the satellite and the geodetic latitude and longitude of a droop point through a WGS-84 reference ellipsoid model, and further obtaining the geocentric latitude and the earth radius of the droop point. The position vectors of the droop point and the satellite in a WGS-84 earth-fixed coordinate system are obtained respectively, the position vectors of the droop point and the satellite are compared to obtain the position vector from the satellite to the droop point, then the position vector is converted into a satellite orbit coordinate system, and rolling and pitching guide angles are calculated. Doppler frequency deviation caused by earth rotation is compensated by adjusting the yaw guide angle. According to the method, the problem that loads such as a spaceborne radar altimeter vertically point to the earth surface of the earth reference ellipsoid model is successfully solved, meanwhile, Doppler frequency deviation generated by earth rotation is compensated, and important technical support can be provided for a subsequent radar satellite earth observation task.
Owner:SHANGHAI SATELLITE ENG INST
High-precision well inclination and azimuth measurement method based on multi-axis sensors
The present invention discloses a high-precision well inclination and azimuth measurement method based on a multi-axis sensor. The method includes: Step 1: Considering the influence of the earth curvature and the earth rotation, establish a local navigation coordinate system for the downhole environment to obtain a reconstructed signal; Step 2: Based on the sensor quality of the four-axis sensor, considering the influence of the Coriolis force caused by the earth rotation, calculate the Coriolis force compensation vector; Step 3: Calculate the projection of the geomagnetic field in the local navigation coordinate system to obtain the geomagnetic field projection vector; Step 4: According to the gravity compensation value, the Coriolis force compensation vector and the geomagnetic field projection vector, combined with the reconstructed signal, calculate the corrected well inclination angle and the corrected azimuth angle. The present invention significantly improves the accuracy of well inclination and azimuth measurement.
Owner:QINGDAO ZHITENG TECH CO LTD
Flight Area Control Method and System for Aircraft
ActiveCN119830606BDesign optimisation/simulationComplex mathematical operationsFlight testEarth's rotation
The present invention relates to a new generation of information technology, and discloses a method and a system for controlling the flight area of an aircraft to improve the adaptability to the test environment. The method includes: calculating the transformation matrix between the associated coordinate systems; during the flight of the aircraft, in real time calculating the coordinates of the current point and the corresponding safety zone boundary in the launch coordinate system according to the transformation matrix between the associated coordinate systems, the longitude and latitude information of the current point, and the azimuth data of the flight test reference trajectory; calculating the longitude and latitude corresponding to the safety zone boundary according to the coordinates of the safety zone boundary in the launch coordinate system, the angular velocity of the earth's rotation in the launch coordinate system, and the radius vector of the origin of the launch coordinate system; judging whether the current point is within the safety zone range according to the longitude and latitude of the current point and the longitude and latitude corresponding to the safety zone boundary. If the current point is within the safety zone, calculating the normal flight control program; otherwise, calculating the safety control program to make the aircraft dive and land.
Owner:HU NAN YUN JIAN JI TUAN YOU XIAN GONG SI
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
Inertia combination goniometer and automatic measurement method for earth rotation angular rate error thereof
PendingCN120252707AAngle measurementNavigation by speed/acceleration measurementsGoniometerOptical gyroscope
The invention discloses an inertial combination goniometer and an automatic measurement method for earth rotation angular rate errors thereof. The inertial combination goniometer comprises a single-axis high-precision optical gyroscope and an inertial measurement unit, the single-axis high-precision optical gyroscope is installed on a measured carrier to sense the change of the rotation angle of the measured carrier rotating around the Z axis in real time. The inertial measurement unit is installed on a measured carrier to sense the rotation angle changes of the measured carrier rotating around the X axis and the Y axis in real time. The rotation angle sensor is connected with the single-axis high-precision optical gyroscope to obtain rotation angle change data of the measured carrier rotating around the Z axis; and according to the rotation angle change data of the X-axis, the Y-axis and the Z-axis, performing real-time calculation by using a strapdown inertial navigation attitude updating algorithm so as to obtain the earth rotation angle rate error in real time.
Owner:NATIONAL INSTITUTE OF METROLOGY CHINA
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
Watch indicating mechanism
The present invention relates to the field of watches, and in particular to a watch indicating mechanism. The watch indicating mechanism comprises a fixed plate, an earth-moon indicating mechanism, an hour indicating mechanism, a minute indicating mechanism, and a gear transmission mechanism connected to the fixed plate; the earth-moon indicating mechanism comprises a rotatable 24-hour globe and a moon indicating mechanism that revolves around the 24-hour globe; the hour indicating mechanism is a chain indicating mechanism; the minute indicating mechanism is a pointer-type minute indicating mechanism; and the gear transmission mechanism connects the movement and transmits power to the earth-moon indicating mechanism, the hour indicating mechanism, and the minute indicating mechanism respectively. The beneficial effects of the present invention are: the earth-moon indicating mechanism simulates the motion trajectory of the earth and the moon, the 24-hour earth indicating mechanism simulates the rotation of the earth, the moon indicating mechanism simulates the revolution of the moon around the earth, the gear ring represents the motion trajectory of the moon indicating mechanism, and the motion relationship between the moon and the earth is simulated in real time, thereby increasing the fun of the watch.
Owner:深圳市贝伦斯智能穿戴科技有限公司
Satellite Signal Source Optimal Point Calibration and Positioning Method, Device, Equipment, and Storage Medium
ActiveCN120176733BNavigation by speed/acceleration measurementsSatellite radio beaconingGyroscopeEarth's rotation
The present application relates to a method, device, equipment and storage medium for correcting and positioning the optimal point of a satellite signal source. The method includes: obtaining a gyro drift estimation model of a celestial gyroscope, constructing an optimization model by maximizing the denominator term of the gyro drift estimation model to minimize the gyro drift rounding error; solving the optimization model according to the earth's angular velocity of rotation and the Schuler frequency of an inertial navigation system to obtain the maximum point of the function corresponding to the denominator term; obtaining an initial value point set according to the maximum points within the first two earth periods of the voyage, using the Newton iteration method to solve the exact value of the initial value point in the initial value point set that is close to the single-point correction time period, calculating the exact maximum point within the single-point correction time period according to the exact value and the period of the first derivative function of the denominator term, and taking the exact maximum point as the optimal gyro correction point; using the optimal gyro correction point for single-point correction. Using this method can improve the navigation accuracy of a rotation modulation inertial navigation system.
Owner:NAT UNIV OF DEFENSE 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
Positioning method using earth rotation and celestial body gravitation effect
PendingCN120426985ANavigation by terrestrial meansNavigation by astronomical meansEarth's rotationCelestial body
The invention provides a positioning method based on earth rotation and celestial body gravitation effect. Positioning of the latitude of the earth where the object is located is achieved through several measurement modes of Coriolis force caused by earth rotation. The measurement of the gravitational forces of the sun and the moon at different relative positions on an object is combined with the gravitational forces generated by the earth on the object to generate different resultant forces, and the longitude of the earth where the object is located is positioned by matching with an accurate clock.
Owner:孙晓博
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
Time landscape clock
The utility model discloses a time landscape clock, two circles of dial plates are arranged on the time landscape clock and are respectively used for displaying minute-second time and hour-level time, the hour-level time is guided by longitude lines on an earth turntable, so that the current time of different time zones is directly displayed, and in order to adapt to the autorotation direction of the earth, the clock can be used for displaying the hour-level time. The earth rotating disc rotates anticlockwise and is different from the minute hand and the second hand in rotation direction, and on the basis, the earth rotating disc rotates to further drive the moon model on the outer ring to rotate so as to display the relation between earth rotation and moon revolution.
Owner:冷涛
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)
Systems and methods for azimuth determination while drilling
A survey tool includes a gyroscope and an accelerometer. The gyroscope can include a multi-axis gyroscope, a reciprocating gyroscope, or a combination thereof. The survey tool is independently rotatable relative to an outer housing and collects gyroscopic measurements and accelerometer measurements during drilling activities. Using the gyroscopic measurements and the accelerometer measurements, the survey tool calculates earth rate components of the rotation of the earth. Using the earth rate components, the survey tool determines the azimuth of the downhole tool.
Owner:SCHLUMBERGER TECH CORP
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