17 results about "Magnetic declination" patented technology

The invention discloses an equipment attitude automatic correction method and device and an optical terminal intensity instrument, the equipment attitude automatic correction method is applied to a preset monitoring terminal comprising a triaxial MEMS accelerometer and a magnetometer, and the method comprises the following steps: collecting acceleration and magnetometer data; calculating acceleration stable three-axis offset; calculating roll and pitch angles and determining a horizontal plane; positioning magnetic north and calculating a magnetic north azimuth angle; calculating a magnetic declination angle and a yaw angle by combining longitude and latitude; generating a rotation matrix and converting a coordinate system; judging angle change and updating the matrix; and completing calibration and attitude stabilization. According to the technical scheme provided by the invention, the monitoring terminal equipment can be ensured to automatically and accurately adjust and stably maintain the attitude after being installed, so that the effective operation of the earthquake monitoring and early warning system is ensured, and the earthquake disaster prevention and flooding earthquake (vibration) monitoring performance is improved.

This invention discloses an automatic attitude correction method, device, and optical terminal intensity meter for equipment. The automatic attitude correction method is applied to a pre-set monitoring terminal including a triaxial MEMS accelerometer and a magnetometer, and includes the following steps: acquiring acceleration and magnetometer data; calculating acceleration-stabilized triaxial offset; calculating roll and pitch angles and determining the horizontal plane; locating magnetic north and calculating the magnetic north azimuth; calculating magnetic declination and yaw angle using latitude and longitude; generating a rotation matrix and performing coordinate system transformation; judging angle changes and updating the matrix; and completing calibration and attitude stabilization. The technical solution provided by this invention ensures that the monitoring terminal equipment can automatically and accurately adjust and maintain its attitude after installation, thereby guaranteeing the effective operation of the earthquake monitoring and early warning system and improving earthquake disaster prevention and seismic monitoring capabilities.

The invention discloses a neodymium-iron-boron magnet and a preparation method and application thereof. The neodymium-iron-boron magnet is provided with a non-parallel magnetic circuit; the neodymium-iron-boron magnet is in a curved surface shape, and the cross section of the neodymium-iron-boron magnet is arc-shaped; wherein any position, except the center of the arc, of the same cross section meets the following formula: delta theta = alpha * (1-cos theta); wherein theta is a magnetic line angle, and theta is more than 0 degree and less than or equal to 90 degrees; delta theta is a numerical value corresponding to the magnetic declination in units of degrees, and 0 < Delta theta < = 10; alpha is selected from constants from 1 to 12. The neodymium-iron-boron magnet has a non-parallel magnetic circuit and also has low magnetic declination and high residual magnetism; after the motor is actually used for a permanent magnet motor, the motor efficiency can be improved, and the sound pressure level is reduced.

The utility model belongs to powder metallurgy technical field provides a kind of rare earth permanent magnetic powder forming device of vertical orientation horizontal pressing, solve the problem that cannot be automatically pressed into shape annulus, pie, radial orientation cylinder, block, tile and so on, device includes automatic weighing cloth mechanism, three electrocylinder magnetic field pressing mechanism, pressing blank stripping mechanism and three-station mould carousel mechanism, the mechanism is placed in sealed cabin uniformly, and there is a set of integrated control system to realize equipment linkage and control;The utility model can accurately control output torque and positioning position, realizes complex pressing action and stripping action, to realize a series of special forming products such as automatic pressing annulus, pie, radial orientation cylinder, block, tile, reduce magnetic declination, improve the performance of rare earth permanent magnetic material finished product.

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.

The present disclosure relates to a method for determining a calibrated true north azimuth, a method for laser communication, and a laser alignment system. The calibrated true north azimuth is used for an alignment unit of a laser communication terminal, the laser communication terminal comprising at least a local device and a target device, the method comprising: obtaining coordinate data of the local device and coordinate data of the target device, the coordinate data comprising: longitude, latitude, and altitude; determining a target azimuth and a target elevation of the local device based on the obtained coordinate data of the local device and the coordinate data of the target device; obtaining an alignment date of the local device, so as to determine a true north azimuth corresponding to the target azimuth and corrected by a magnetic declination from a world magnetic field model according to the coordinate data of the local device and the alignment date. The present disclosure can determine a calibrated true north azimuth and perform alignment, thereby improving the alignment accuracy between laser communication devices.

The application discloses a kind of geophysical network multidimensional data visualization analysis method and system, specifically related to physical station data visualization technical field;The application establishes the correlation mechanism of earthquake, geomagnetic, gravity data by creating earthquake number, integrates the scattered multi-source data into structured earthquake data package and abnormal data package, forms complete earthquake data archives, then through sub-time zone division, historical benchmark comparison and other methods, the vertical component of magnetic field, horizontal component, magnetic declination and gravity acceleration and other parameters are converted into quantifiable vertical performance value, horizontal performance value and other indexes, and a closed quadrilateral is constructed to intuitively present the relationship of multidimensional data, solve the problem that the prior art cannot form complete earthquake data archives, thereby restricting the depth of earthquake precursor signal mining.

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 relates to the technical field of weight measurement. The method comprises the following steps: extracting a gravity vector component in a vertical direction according to acceleration vector information, calculating to obtain a gravity acceleration measured value of a current measurement position based on the gravity vector component, calculating a geomagnetic declination angle according to magnetic field vector information, and measuring the gravity acceleration measured value of the current measurement position according to the geomagnetic declination angle. A preset geomagnetic-latitude mapping rule is matched based on the geomagnetic declination, geographic latitude parameters corresponding to the current measurement position are derived, the geographic latitude parameters are input into a standard gravitational acceleration calculation model, and a standard gravitational acceleration value corresponding to the current measurement position is generated; and constructing a gravity compensation factor according to a difference value between the standard gravitational acceleration value and the measured gravitational acceleration value, and converting an original voltage value output by the weighing sensor based on the gravity compensation factor to obtain a corrected mass value of the target object. The body weight measuring device has the effect of improving the measurement adaptability of body weight measurement.

The present application relates to a kind of measuring magnetic azimuth measuring probe tube magnetic declination when accurate orientation device and method, belong to directional drilling field.The present application provides a kind of measuring magnetic azimuth measuring probe tube magnetic declination when accurate orientation device and method, adjusting ring, instrument sleeve, laser, laser position adjusting screw, instrument sleeve position adjusting screw and clamping block are assembled into magnetic azimuth measuring probe tube accurate orientation device and are fixed to true north direction, then set bar target in fixed point north direction, after magnetic azimuth measuring probe tube is placed into the rear cavity of instrument sleeve, the average of the measured value of magnetic azimuth measuring probe tube is obtained by subtracting the north direction value from the average of the measured value of magnetic azimuth measuring probe tube, and the magnetic declination in the north direction is obtained, and the magnetic declination in the east direction, the south direction and the west direction is obtained according to the same method, and the average of the four magnetic declination values is the magnetic declination of the magnetic azimuth measuring probe tube.The present application can make probe tube placement orientation error less than 0.1 °, greatly improve the accuracy of probe tube azimuth magnetic declination measurement.

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 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 discloses a geophysical station network multi-dimensional data visualization analysis method and system, and particularly relates to the technical field of physical station data visualization. According to the method, an association mechanism of seismic data, geomagnetic data and gravity data is established by creating seismic numbers, dispersed multi-source data is integrated into a structured seismic data packet and an abnormal data packet to form a complete seismic data file, and then the seismic data file is obtained through methods of sub-time zone division, historical reference comparison and the like. Parameters such as a vertical component, a horizontal component, a magnetic declination and gravitational acceleration of a magnetic field are converted into quantifiable indexes such as a vertical representation value and a horizontal representation value, and a closed quadrangle is constructed to visually present a multi-dimensional data relationship, so that the problem that in the prior art, a complete seismic data file cannot be formed, and deep mining of seismic precursor signals is restricted is solved.

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 application provides a low-latitude magnetic anomaly reduction-to-pole method and device, electronic equipment and storage medium, comprising: obtaining frequency domain magnetic anomaly data through Fourier transform on acquired space domain magnetic anomaly data; separating initial amplitude spectrum and initial phase spectrum by decomposing frequency domain initial pole factor; modifying the initial amplitude spectrum through a suppression modification algorithm, and setting an adaptive modification domain; recombining the modified amplitude spectrum and the separated initial phase spectrum to construct a recombined pole factor, and performing pole reduction operation on the frequency domain magnetic anomaly data and the recombined pole factor to obtain pole-reduced frequency domain magnetic anomaly data; and obtaining a pole reduction result by inverse Fourier transform of the pole-reduced frequency domain magnetic anomaly data to the space domain. The application has accurate and reliable reduction-to-pole results in low-latitude regions, higher precision, and effectively eliminates the stretching phenomenon of magnetic anomalies along the direction perpendicular to the magnetic declination angle.

The invention relates to a cultural relic lossless dating method based on diamond nitrogen-vacancy color center quantum sensing, and belongs to the technical field of cultural relic age determination and quantum sensing. The method solves the problem that destructive sampling needs to be carried out in traditional cultural relic dating technologies such as radioactive carbon dating and thermoluminescence dating, so that permanent damage is caused to cultural relics. Firstly, a sample is prepared and positioned, and a flat area rich in magnetic minerals on the surface of a cultural relic is selected; acquiring high-resolution three-dimensional shape data by using a scanning probe; a quantum probe integrated with a diamond nitrogen vacancy color center is adopted to measure surface stray magnetic field distribution in a non-contact manner through an optical detection magnetic resonance technology; based on the magnetic field data and the morphology information, equivalent thermal remanence vectors including magnetic declination, magnetic inclination and magnetization intensity in the cultural relic are calculated through a frequency domain inversion algorithm; and finally, comparing the paleomagnetic field parameter obtained by inversion with an archaeological geomagnetic long-term change reference curve, and determining a cultural relic firing age interval through least square method matching. According to the invention, zero-damage detection is realized.