8 results about "Magnetic dip" patented technology

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.

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 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.

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.