16 results about "Magnetic dip" patented technology

The invention relates to the technical field of navigation, and provides a magnetic compass error model calibration method and system, and the method comprises the steps: obtaining three-axis magnetic field data of a target magnetic compass under a target attitude; determining a magnetic declination angle and a magnetic inclination angle of the target position according to the longitude and the latitude of the target magnetic compass under the target attitude; determining geomagnetic real data under the target attitude according to the magnetic declination angle and the magnetic inclination angle; determining a geomagnetic conversion matrix according to the three-axis magnetic field data; wherein a vector difference value between the three-axis magnetic field data and the geomagnetic real data after the geomagnetic conversion matrix operation is not greater than a preset vector difference value; determining a target function according to the geomagnetic real data and the geomagnetic conversion matrix; solving the target function through an iterative algorithm to obtain an optimal solution of the target function; and obtaining corrected three-axis magnetic field data according to the geomagnetic conversion matrix corresponding to the optimal solution, and calculating the magnetic heading of the magnetic compass sensor according to the corrected three-axis magnetic field data.

The present invention discloses a magnetic anomaly pole-localization method based on equivalent source inversion, comprising: uniformly gridding the underground space according to observation data, and constructing an equivalent source space by setting an inversion depth; obtaining a sensitivity matrix for forward and inverse calculations of magnetic survey data according to the observation data and parameters of the equivalent source space; calculating physical parameters of the equivalent source space using a generalized minimum residual method according to the sensitivity matrix and magnetic anomaly data, and constructing an equivalent source model; forward modeling the vertically magnetized geomagnetic field according to the sensitivity matrix and the equivalent source model to obtain a magnetic anomaly pole-localization result. The method reconstructs an inversion calculation framework of the equivalent source model based on the generalized minimum residual method, solves problems such as the difficulty in solving large-scale equation groups in similar inversions, improves the efficiency and accuracy of equivalent field source inversion imaging, can well achieve stable pole-localization under arbitrary geomagnetic inclination conditions, and is suitable for pole-localization processing of magnetic anomalies in regions with low geomagnetic latitudes, especially in the magnetic equatorial region.

The automatic geomagnetic declination and dipmeter comprises an external supporting structure, a rotating frame, a central turntable, a gyroscope, a fluxgate sensor, a driving device and a master controller, the rotating frame is rotatably installed on an external supporting structure through a vertical shaft, and the rotating frame is provided with a transverse shaft. The central turntable is mounted on the transverse shaft; the gyroscope is mounted on the rotating frame; rotation of the transverse shaft and the vertical shaft is achieved through a driving device. The rotating angles of the transverse shaft and the vertical shaft are measured through an angle measuring device; the fluxgate sensor is fixedly arranged on the central turntable and is used for measuring a geomagnetic declination angle and a geomagnetic inclination angle; the master controller is used for reading the numerical value of the fluxgate sensor, reading the angle information of the gyroscope and reading the angle information of the horizontal axis and the vertical axis; the master controller is also used for controlling the driving device to work; the mechanism azimuth angle, the geomagnetic declination measurement value and the geomagnetic inclination measurement value are used for being uploaded to geomagnetic station network calculation software, and therefore observation values of the geomagnetic declination and the geomagnetic inclination of the current position are obtained.

This application discloses a geomagnetic sensor calibration method, apparatus, and electronic device, belonging to the field of electronic device technology. The method includes: when the geomagnetic sensor of the electronic device is detected to be subjected to magnetic interference, acquiring the current yaw angle, pitch angle, rotation angle, magnetic tilt angle, and Earth's magnetic field strength of the electronic device; determining the current standard triaxial magnetic field data of the electronic device based on the yaw angle, pitch angle, rotation angle, magnetic tilt angle, and Earth's magnetic field strength; determining the triaxial magnetic field deviation value of the geomagnetic sensor based on the measurement data of the geomagnetic sensor and the standard triaxial magnetic field data; and calibrating the geomagnetic sensor based on the triaxial magnetic field deviation value.

An improved total field calibration system and method is disclosed for reducing the rotational misalignment between magnetic and gravity sensors in a directional sensing system. A method of calibrating a tri-axial directional sensor comprising orthonormal accelerometers and orthonormal magnetometers, comprises measuring Earth's magnetic and gravity fields with said directional sensor in at least 4 sensor orientations; obtaining at least one reference field value of dip drift of Earth's magnetic field from at least one source independent of said directional sensor corresponding to said orientations; and, determining and applying rotational misalignments between said magnetometers and said accelerometers so that measured magnetic dip drifts are substantially equal to said reference values. The calibration process can be performed without monitoring the declination change during the calibration process. Directional sensing systems can be calibrated accurately during a period when the Earth's magnetic field changes rapidly.

The application discloses a magnetic target positioning method based on geomagnetic total field vertical difference, utilizes a rotor unmanned aerial vehicle to carry an inertial navigation system and two vertically distributed optical pumping magnetometers, simultaneously measures geomagnetic total field data containing magnetic anomalies and real-time position data of the unmanned aerial vehicle when flying along a survey line, regards the magnetic target as a static magnetic dipole, takes the centers of the two optical pumps at the initial position as a coordinate origin, uses the magnetic moment of the magnetic target, position coordinates, known geomagnetic inclination and geomagnetic declination and real-time position coordinates of the two optical pumps to respectively represent the magnetic anomaly fields generated by the magnetic target at the positions of the two optical pumps, calculates the geomagnetic total field vertical difference of each point on the survey line by using the measurement values of the two optical pumps, jointly constructs a target function by using the magnetic anomaly difference values generated by the magnetic target at the positions of the two optical pumps, and estimates the position of the magnetic target by using a cuckoo optimization algorithm.

The invention discloses an equivalent source inversion-based magnetic anomaly pole transformation method, which comprises the following steps of: performing uniform mesh generation on an underground space according to observation data, and constructing an equivalent source space by setting an inversion depth; according to the observation data and the equivalent source space parameters, obtaining a sensitivity matrix of forward and reverse calculation of the magnetic measurement data; according to the sensitivity matrix and the magnetic anomaly data, physical property parameters of an equivalent source space are calculated by using a generalized minimum residual method, and an equivalent source model is constructed; according to the sensitivity matrix and the equivalent source model, forward modeling of the vertical magnetization geomagnetic field is carried out, and a magnetic anomalous pole conversion result is obtained.According to the method, an inversion calculation framework of the equivalent source model is reconstructed on the basis of the generalized minimum residual method, and the problem that large equation sets are difficult to solve in similar inversion is solved; the efficiency and precision of equivalent field source inversion imaging are improved, the pole stabilization under any geomagnetic inclination angle condition can be well realized, and the method is suitable for pole conversion processing of magnetic anomalies in low geomagnetic latitude, especially magnetic equatorial regions.

The present invention discloses a deep-sea magnetic field correction method and system for attitude perception, including: obtaining geographical location parameters and detection time parameters of the current detection location, where the geographical location parameters include longitude, latitude, and sea level depth, and further obtaining the theoretical magnetic field value of the current detection location according to the IGRF model; obtaining the actual detected magnetic field value of the three-component magnetometer at the same detection time at the current detection location, where the actual detected magnetic field value includes magnetic field components in three orthogonal directions, total magnetic field intensity, magnetic dip, and magnetic declination; constructing a deep-sea magnetic field error model including soft magnetic error, orthogonal error, and hard magnetic error, calculating the corresponding magnetic field error according to the theoretical magnetic field value and the actual detected magnetic field value, and using the principal component analysis method to extract magnetic field error characteristics to obtain error eigenvectors and eigenvalues; calculating the error contribution rate of each magnetic field error characteristic type, and performing principal component analysis according to the error contribution, and further calculating the magnetic field correction value.

The application relates to a buried pipeline depth positioning method based on the characteristics of two-dimensional body magnetic anomaly, which uses a three-component magnetic sensor to measure, and can realize the determination of the depth of a buried pipeline on the premise of determining the pipeline azimuth angle. The buried pipeline is regarded as a two-dimensional body, the gradient value of the horizontal component magnetic anomaly curve of a single measuring line is obtained, the deviation rate is determined after the magnetic dip angle, the magnetic declination angle and the pipeline azimuth angle are calculated from the measurement data according to a preset pipeline buried depth value, then the distance between the maximum value and the minimum value of the gradient value of the magnetic anomaly of the single measuring line corresponding to the horizontal coordinate is obtained by the above method, and the actual pipeline buried depth value is calculated according to the deviation rate calculation formula. The method provided by the application fully utilizes the measurement data measured by the three-component magnetic sensor, the positioning result is more accurate, and the additional error caused by the polar conversion operation of other methods is overcome. The application overcomes the problem that the measuring line must be perpendicular to the pipeline axis direction when the pipeline buried depth is calculated by other methods, and the working efficiency is higher.

The invention provides a scalar geomagnetic self-ground-finding and transient roll angle measuring method, device and system for a high-rotation flying body. The method comprises the following steps: measuring orthogonal biaxial geomagnetic intensity data by adopting a biaxial magnetoresistive sensor; performing self-compensation on the measured orthogonal biaxial geomagnetic intensity data based on the geomagnetic data internal constraint and the flight body rolling motion characteristic constraint; carrying out self-calibration on the self-compensated orthogonal biaxial geomagnetic intensity data; based on the self-calibrated orthogonal biaxial geomagnetic intensity data, calculating a roll angle of the magnetoresistive sensor relative to the geomagnetic direction, namely the roll angle of the magnetoresistive sensor; and finally, correcting the roll angle of the magnetoresistive sensor according to the installation bias of the magnetoresistive sensor and the local magnetic inclination angle to obtain the roll angle of the aircraft relative to the ground direction. By using the method, the navigation calculation precision of the large-span transient roll angle of the flight body can be improved.

The invention discloses an absolute geomagnetic field vector observation method, and relates to the technical field of geomagnetic measurement. The absolute geomagnetic field vector observation method comprises the following steps: correcting drift values of three axes (A axis, B axis and C axis) of a three-axis fluxgate sensor for observation by using a three-axis magnetic sensor for correction and a magnetic shielding cylinder; determining the relative relationship between the three axes and the optical axis of the telescope of the non-magnetic theodolite, determining the absolute orientation of the three axes, and calculating the geomagnetic field component under the geographic coordinate system by combining the magnetic field readings of the three axes; the absolute total field intensity of the geomagnetic field observed by the total field sensor is used for correcting the observation error of the three-axis fluxgate sensor to obtain a corrected absolute geomagnetic field vector (including an absolute geomagnetic declination angle and a geomagnetic inclination angle); during the period, the three-axis magnetic sensor for correction and the magnetic shielding cylinder are used for automatically correcting the three-axis fluxgate sensor for observation. By implementing the absolute geomagnetic field vector observation method provided by the invention, high-precision absolute automatic continuous observation of three parameters including the geomagnetic field intensity, the geomagnetic declination and the geomagnetic dip angle can be realized.

The invention relates to the technical field of marine surveying and mapping, investigation and detection, in particular to a real-time positioning interpretation method on a magnetic field profile of an underwater point magnetic source target object, which comprises the following steps: establishing a marine surveying and mapping space rectangular coordinate system; calculating the induced magnetization intensity and the gravitational potential generated by the point magnetic source at the observation point; determining the relationship between the magnetic potential and the attraction potential; determining the relationship between the magnetic field intensity and the magnetic potential; determining the magnetic field intensity of the point magnetic source according to the total magnetic field intensity in combination with the normal magnetic field intensity; determining an underwater point magnetic source target object magnetic anomaly calculation model; calculating and generating a magnetic anomaly plane contour map, a magnetic anomaly maximum value point coordinate and a magnetic anomaly minimum value point coordinate; according to the geomagnetic inclination angle and based on the corresponding relation between the positioning quantile and the geomagnetic inclination angle, the positioning quantile is determined, and the actual position of the underwater point magnetic source target object is calculated and determined. According to the invention, the corresponding position of the target object on the magnetic field profile can be rapidly and accurately interpreted in real time on a detection site.

The present invention discloses a prediction method for the probability of occurrence of foEs at a single station in China, comprising the following steps: Step 1, obtaining the magnetic inclination angle of the station location, and determining whether the station is in the middle latitude or the low latitude; Step 2, obtaining 11 years of foEs observation data of various ionospheric observation stations in China, and analyzing the statistical law of foEs; Step 3, calculating the probability of occurrence of foEs from 0:00 to 23:00 in spring, autumn, summer and winter; Step 4, performing polynomial fitting on the foEs value and the probability of occurrence of foEs, calculating the best fitting curves in different seasons, and calculating the probability of occurrence of any foEs value using a prediction model. The method disclosed by the present invention can utilize the ionospheric vertical measurement data in China, classify the foEs data according to the season, establish a single-station foEs probability prediction model, and further calculate the probability of occurrence of any foEs value, providing good technical support for the design and operation and maintenance of radio systems.

A method for drilling includes rotating a BHA in a wellbore. Triaxial accelerometer and triaxial magnetometer measurements are made while rotating the BHA using corresponding triaxial accelerometer and triaxial magnetometer sets that are deployed in a roll-stabilized housing. Magnetic dip angles are computed from the accelerometer and magnetometer measurements using an inclination independent model. The computed dip angles are compared with a reference magnetic dip angle and a magnetometer bias is selected that minimizes a difference between the computed magnetic dip angles and the reference magnetic dip angle.

The invention relates to the technical field of marine surveying and mapping, investigation and detection, in particular to a magnetic anomaly target object burial depth inversion method based on extreme value information of a single sensor, which comprises the following steps: establishing a marine surveying and mapping space rectangular coordinate system; calculating the induced magnetization intensity formed by the point magnetic source under the action of the geomagnetic field and the gravitational potential generated at the observation point, and establishing the relationship between the magnetic potential and the gravitational potential based on the Poisson equation of the gravity-magnetic potential field; the corresponding relation between the magnetic field intensity and the magnetic potential is deduced by combining the electromagnetism principle, the geomagnetic inclination angle and the magnetic declination angle, and an underwater point magnetic source magnetic anomaly calculation model is constructed by using the total magnetic field intensity actually measured by a magnetometer and the normal geomagnetic field intensity; and extracting a maximum value and a minimum value in the magnetic anomaly, performing specific value operation, solving a vertical distance from the point magnetic source to the observation plane, and calculating the burial depth of the underwater target object through a geometrical relationship. The method is suitable for a detection scene of a ferromagnetic target object with a sandy substrate or a small scale.

The present invention discloses a magnetic interface inversion method and device based on magnetic anomaly modulus. The method includes: constructing a plurality of magnetic interfaces, setting a reference plane corresponding to the magnetic interfaces on the surface of the earth, and the magnetic interfaces undulating up and down around the reference plane; setting a random magnetic dip angle, a random magnetic declination and a magnetization intensity for the magnetic interfaces, calculating the simulated magnetic anomaly modulus of the magnetic interfaces at each observation point on the surface of the earth, and repeating the calculation to obtain the simulated magnetic anomaly modulus of all the magnetic interfaces at each observation point on the surface of the earth; using the simulated magnetic anomaly modulus of the magnetic interfaces in a neural network for magnetic interface inversion to predict the depth distribution of the Curie surface. The present invention effectively considers the influence of remanent magnetism, improves the accuracy of the inversion result, and can obtain relatively accurate interface depth information at the same time.