81 results about "Full tensor" patented technology

The invention discloses a full-tensor magnetic field gradiometer based on the giant magnetic impedance effect. The full-tensor magnetic field gradiometer comprises an X-Y-direction gradiometer body, a Z-direction gradiometer body and signal leads. The X-Y-direction gradiometer body comprises a cross-shaped substrate and a giant magnetic impedance thin film, the Z-direction gradiometer body comprises a rectangular substrate and a giant magnetic impedance thin film, a junction point at the input end and a junction point at the output end of an electric bridge are connected with the signal leads, and the signal leads are arrayed symmetric with the geometric center of the whole gradiometer as the three-dimensional center. The full-tensor magnetic field gradiometer has the advantages of being high in accuracy, minimized, low in cost, wide in frequency response, rich in information and the like. Due to the design of preparing a three-dimensional structure through planar thin films, the problem of space consistency of the full-tensor magnetic field gradiometer based on the giant magnetic impedance thin films is solved, and the magnetic field gradient measuring sensor with the size at the chip level is designed for the first time.

The invention discloses a measuring and controlling device for aviation superconducting full tensor magnetic gradient based on GPS (Global Positioning System) synchronization. The measuring and controlling device is characterized by being positioned in a pod of a suspension and pod subsystem; the measuring and controlling device for the aviation superconducting full tensor magnetic gradient consists of an SQUID (Superconducting Quantum Interference Device) reading circuit, a data acquisition and communication module, a flying position and pose information recording module, a working environment monitoring module and a human-machine interface module; other four modules are connected by taking a star topology structure with the data acquisition and communication module as the core. According to the device, after a specific signal at the designated time is resampled by a PPS (Pulses Per Second) frequency doubling sampling clock generated through a digital phase-locked loop based on a GPS time service function, the synchronization of the device and the position and pose information which are given out by a GPS integration navigation is realized by using a time stamp, so that the foundation is laid for inversion by altitude projection; besides, the measuring and controlling device has the characteristics of simplicity for realization, and high extendibility and reliability, and is particularly suitable for being applied under an aviation platform.

The invention belongs to the technical field of image or video data calculation methods, and particularly relates to a visual data completion method based on low-rank tensor estimation of a limited nuclear norm. The method comprises the following steps of A1, initializing a pre-prepared original tensor to be complemented to obtain a target tensor x, wherein the original tensor to be complemented comprises a color image and a video sequence; A2, constructing a limited kernel norm model for tensor completion by using the target tensor x to obtain a tensor completion target function; A3, performing optimization modeling on the objective function to obtain an alternative function capable of solving the optimal solution of the objective function; and A4, solving the substitution function to obtain a target tensor, converting the target tensor into a data source corresponding format, and obtaining a final completion result of the color image and the video sequence. According to the method, an improved restriction nuclear norm model is extended to tensor data completion to approach the rank of original tensor data, so that tensor data completion is completed.

The invention provides a full-tensor space gradient compensation method and system used for biomagnetic detection. The method includes the steps of determining 9 full-tensor first-order gradient components of an environment magnetic field to be the first-order gradient components, in the x direction, the y direction and the z direction respectively, of the x-direction magnetic field, the first-order gradient components, in the x direction, the y direction and the z direction respectively, of the y-direction magnetic field and the first-order gradient components, in the x direction, the y direction and the z direction respectively, of the z-direction magnetic field according to a three-dimensional rectangular coordinate system xyz, determining 5 independent first-order gradient components in the full-tensor first-order gradient components, establishing the 5 independent first-order gradient components through a magnetometer, conducting compensation on a signal channel of the environment magnetic field, obtaining a compensation coefficient through the minimum mean square error, and achieving the compensation for the full-tensor first-order gradient components of the signal channel of the environment magnetic field. By means of the method and the system, the space full-tensor first-order gradient compensation is achieved, the environment noise can be more effectively restrained, and the noise restraining performance of a gradiometer is improved.

A method for obtaining full tensor gain compensated propagation measurements includes processing a full tensor voltage measurement to obtain a fully gain compensated tensor quantity. An electromagnetic logging tool including at least first and second axially spaced transmitters and at least first and second axially spaced receivers is rotated in a subterranean borehole. A plurality of voltage measurements are acquired while rotating to obtain a full tensor voltage measurement which is in turn processed to obtain the fully gain compensated tensor quantity.

The invention relates to an inertial navigation system with a gravity disturbance autonomous compensation function and a method thereof. The inertial navigation system is technically characterized bycomprising a gimbaled inertial navigation system, an inertial information measurement module and a gravity gradient measurement module; the gimbaled inertial navigation system comprises a tri-axial platform frame, a platform body and a platform base; the inertial information measurement module comprises an inertial measurement unit and a gravity measurement module; the inertial measurement unit outputs line motion information and angular motion information for navigation solution; the tri-axial platform frame stabilizes the platform body under a geographic coordinate and simultaneously outputscarrier position, speed, heading and attitude navigation information; and the gravity measurement module and the gravity gradient measurement module synchronously measure gravity anomaly informationof a current position of a carrier and full tensor gravity gradient information and calculate gravity vector information of the current position of the carrier, and the gravity vector information is used for the navigation solution of the inertial measurement unit. The precision of the inertial navigation system can be improved.

The invention discloses an underwater target detection method based on full tensor gravity gradient inversion, specifically comprising the following steps: (1) storing the full tensor gravity gradient reference map in the activity water area in advance; (2) adopting a gravity gradient sensor on an underwater vehicle to measure the activity water area in real time to obtain the gravity gradient signal measured in real time, comparing the obtained gravity gradient signal measured in real time with the full tensor gravity gradient reference map stored in advance to obtain anomaly of the full tensor gravity gradient caused by the target; (3) inversing the anomaly of the full tensor gravity gradient and computing the directionality parameter and the quality of the target; and (4) computing the position of the target by integrating the computed quality and directionality parameter of the target to complete underwater target detection. Compared with other detection methods, the underwater target detection method has the typical characteristics of safe concealment, accuracy, effectiveness, real passivity and autonomy, etc, is especially suitable for underwater vehicles, greatly reduces manual intervention, consumes less time and improves the detection accuracy.

The invention belongs to the field of aeromagnetic software compensation, and particularly relates to a towed aeromagnetic full-tensor gradient data software compensation method based on forward calculation. The towed aeromagnetic full-tensor gradient data software compensation method based on forward calculation is designed by aiming at an aeromagnetic full-tensor gradient towed measuring manner, and has the advantages that, the aeromagnetic full-tensor gradient data software compensation can be performed on the attitudes and relative positions of a helicopter and a nacelle as well as the magnetic field uniform dynamic change condition of the helicopter in the aeromagnetic gradient measuring process, and relative errors are reduced compared with the prior art.

The invention provides an SQUID (Superconducting Quantum Interference Device) full-tensor measuring module, a magnetocardiogram signal detecting device and a magnetocardiogram signal detecting method. The method comprises the following steps: placing the heart of a detected object right below the SQUID full-tensor measuring module, wherein the SQUID full-tensor measuring module comprises a full-tensor gradiometer and a three-axis magnetometer; acquiring a magnetocardiogram signal, and obtaining a magnetometer signal and a gradiometer signal at the same time; obtaining a full-tensor gradient signal of the magnetocardiogram signal according to the gradiometer signal; obtaining a characteristic value and a rotation invariant according to the full-tensor gradient signal of the magnetocardiogram signal, and analyzing the characteristic value and the rotation invariant. The full-tensor magnetic gradiometer can be formed by a plurality of non-coplanar SQUID plane gradiometers, and the first-order gradient information of a space magnetic field is detected; meanwhile, the three-dimensional information of the magnetic field is also detected by using the SQUID three-axis magnetometer. The SQUID full-tensor measuring module, the magnetocardiogram signal detecting device and the magnetocardiogram signal detecting method are applied to detection of the magnetocardiogram signal, the vector information and the full-tensor first-order gradient information of the magnetocardiogram signal can be obtained at the same time, and richer magnetocardiogram signal information is obtained.

The present invention provides a method for acquiring an aeronautic superconducting full tensor magnetic compensation coefficient, a terminal and a storage medium. The method comprises the following steps: an approximate value of a magnetic compensation coefficient of a plane gradiometer with respect to eddy current interference is acquired based on dynamic measured data, and a constraint range ofthe magnetic compensation coefficient of the plane gradiometer with respect to the eddy current interference is acquired based on the approximate value of the magnetic compensation coefficient; whenan aircraft carries a built-in aeronautic superconducting full tensor magnetic gradient measuring system for high altitude maneuvering flight, measured values of a magnetic gradient and a triaxial magnetic-field component output by the aeronautic superconducting full tensor magnetic gradient measuring system are acquired; the constraint range of the magnetic compensation coefficient of the plane gradiometer with respect to the eddy current interference is taken as a constraint condition, and the measured values of the magnetic gradient and the triaxial magnetic-field component are substitutedinto a magnetic compensation model with the constraint condition, thereby an optimal value of the aeronautic superconducting full tensor magnetic compensation coefficient is acquired. The invention solves the problem that an existing method cannot acquire the optimal solution of the aeronautic superconducting full tensor magnetic compensation coefficient.

The embodiment of the invention discloses a method and device for correcting a differential rotary full tensor instrument, and belongs to the technical field of correction of tensor instruments. According to the method for correcting the differential rotary full tensor instrument, according to the tensor transformation relation between a sensor coordinate system and an instrument coordinate system, an error model is established, a coefficient matrix in the error model is calculated, thus the corrected tensor value can be calculated through the error model, and the problem that an error analysis and correction method of a differential rotary full tensor instrument in the prior art does not exists is solved.

The invention discloses a method and system for determining an earth gravitational field recovered from a satellite gravity gradient full tensor. The method includes: preprocessing satellite gravity gradient measured data to obtain the in-situ disturbance gravitational gradient data; performing gridding treatment on the in-situ disturbance gravitational gradient data to obtain the grid point valuedisturbance gravitational gradient data, and establishing a full tensor expression thereof; performing integral processing on the grid point value disturbance gravitational gradient data to obtain grid mean value disturbance gravitational gradient data, and establishing a full tensor expression thereof; recovering an earth gravitational field based on the grid mean value disturbance gravitationalgradient data and the full tensor expression thereof. The method and system provided by the invention can fully excavate the gravitational field information contained in various types of observationdata and fully utilize various types of observation information to recover the earth gravitational field to the utmost extent, thereby obtaining an accurate earth gravitational field model and providing a technical support for grid mean value disturbance gravitational gradient full tensor data joint inversion.

The invention provides a full tensor magnetic gradient measurement assembly calibration system and a calibration method. The system comprises an excitation source, a calibration source electrically connected to the excitation source for generating a calibration magnetic field under the drive of the excitation source, a non-magnetic turntable arranged below the calibration source for performing angle adjustment on the calibration source, an installation support arranged at one side of the calibration source for providing an installation platform, a full tensor magnetic gradient measurement assembly arranged on the installation support for measuring the magnetic field gradient value generated at the full tensor magnetic gradient measurement assembly by the calibration source, a measurement and control assembly electrically connected to the full tensor magnetic gradient measurement assembly for acquiring and storing the magnetic field gradient value, and an attitude adjusting device arranged at one side of the calibration source for fixing the installation support and performing fixed point rotation on the installation support to achieve attitude adjustment on the full tensor magneticgradient measurement assembly. Thus, the problem that a simple and efficient calibration system and a calibration method cannot be provided in the prior art can be solved.

The invention discloses a buried steel pipeline damage full-tensor geomagnetic detection system and an implementation method. A signal conditioning module is used for conditioning multi-channel differential analog voltage signals output by a tunnel magnetic resistance multi-element sensor array probe; a data information high-speed processing module is composed of an FPGA as a main control chip; apipeline damage feature extraction and identification module is controlled by an ARM; a damage positioning module is used for acquiring longitude and latitude coordinate information, the pipeline detection route is calculated, and the damage position is positioned; the field environment is combined to divide and independently process the magnetic field information of different pipe sections, meanwhile, the 15-axis data is deeply excavated, array advantages are brought into play, the gradient of the three-dimensional damage magnetic field signals in the three directions of the XYZ is calculated, a magnetic gradient full tensor matrix is constructed, and effective extraction and identification of pipeline damage information are realized. According to the buried steel pipeline damage full-tensor geomagnetic detection system, an additional excitation source is not needed, a feasible scheme for non-excavation detection on the ground of the buried steel pipeline is provided, and a certain reference and practical values are achieved.

The present invention relates to a full-tensor gravity gradient measurement device and method. The full-tensor gravity gradient measurement device comprises a computer, a cube frame and accelerometers which are arranged at the eight corners of the cube frame respectively and of which the sensitive shafts are in the horizontal planes. For the four accelerometers in the same horizontal plane of the cube frame, the sensitive shafts of one to three accelerometers are along a west-east direction, and the sensitive shafts of the other accelerometers are along a south-north direction. For the accelerometers which are located in the different horizontal planes of the cube frame and of which the sensitive shaft directions are same, only two accelerometers are in the right above direction and the right below direction, and the above devices are put in a right angle coordinate system, so that the edges of the cube frame are along the X, Y and Z directions separately, and the XX, YY, XY, XZ and YZ components of the gravity gradient and the other components are calculated by the reading of the accelerometers. The measurement device and method of the present invention can realize the gravity gradient measurement at the normal temperature and at the static state that the accelerometers do no need to rotate, can work in an near earth space, and also can be used in a micro-gravity environment.

The invention provides a copper coil-based full-tensor magnetic field gradient measurement device. The copper coil-based full-tensor magnetic field gradient measurement device comprises a gradiometer main body, a supporting base and a signal connection interface, wherein the gradiometer main body is used for measuring full-tensor magnetic field and magnetic field gradient information of each point in a space, and the full-tensor magnetic field and magnetic field gradient information comprises a response gradient value corresponding to five independent components in a full-tensor matrix and three magnetic field vector values of a central point; the supporting base is used for horizontal regulation operation which is required to be carried out during measurement of the magnetic field gradient of the space; the signal connection interface is used for transmitting weak voltage signals corresponding to the magnetic field gradient and central magnetic field intensity. According to the copper coil-based full-tensor magnetic field gradient measurement device provided by the invention, the technical defect that a traditional magnetic field gradient measurement device just can be used for measuring gradient information in a single direction of a magnetic field is solved, and the space consistency and the information integrity of magnetic field component measurement are increased.

The invention provides a SQUID (Superconducting Quantum Interference Device) flux converter device used for detecting a magnetic field intensity tensor, which comprises a full-tensor copper coil gradient meter, a coupling coil and an SQUID magnetometer, wherein the coupling coil is bidirectionally coupled to the full-tensor copper coil gradient meter and the SQUID magnetometer so as to couple magnetic flux in a copper coil of the full-tensor copper coil gradient meter to a pickup coil of the SQUID magnetometer, the magnetic flux of the copper coil in the full-tensor copper coil gradient meter is converted to the pick-up coil in the SQUID magnetometer, and the magnetic flux is converted into a voltage value so as to enable the SQUID magnetometer to perform measurement. According to the invention, measurement for full-tensor magnetic field gradient data can be realized by using only one SQUID magnetometer, and high-precision magnetic field measurement is realized through an SQUID, so that a magnetic field of an FT (10-15T) level can be measured, and thus the cost is greatly saved.

The invention discloses a visual data completion method based on low-rank tensor ring decomposition and factor prior, and aims to solve the problem that a traditional data completion algorithm based on tensor decomposition depends on initial rank selection, so that a recovery result lacks stability and effectiveness, and a layered tensor decomposition model is designed. Tensor ring decomposition and complementation are realized at the same time, and for the first layer, incomplete tensors are expressed as a series of third-order factors through tensor ring decomposition; for the second layer, the transformation tensor nuclear norm is used for representing the low-rank constraint of the factors, and the degree of freedom of each factor is limited in combination with the factor priori of graph regularization; according to the method, the low-rank structure and the prior information of the factor space are utilized at the same time, on one hand, the model has implicit rank adjustment, the robustness of the model to rank selection can be improved, and therefore the burden of searching the optimal initial rank is relieved, and on the other hand, potential information of tensor data is fully utilized, and the complementation performance is further improved.

The invention relates to the field of magnetic measurement and discloses a full-tensor magnetic gradient positioning detection data filtering method. The method includes: performing fixed-point acquisition of magnetic field data, and determining magnetic field components of the magnetic field data in directions x, y and z and first-order gradient components of each magnetic field component in directions x, y and z to obtain data of 12 components; determining 5 independent components in full-tensor magnetic gradient data; aiming at data of each component, decomposing the component data into thesum of intrinsic mode functions in preset quantity according to an empirical mode decomposition algorithm; determining reconstruction parameters of the three magnetic field components and the five independent component according to an energy threshold method, and performing construction; as for data of the four components not participated in reconstruction, performing similar reconstruction by adopting same reconstruction parameters according to a data corresponding relation in full tensor; integrating reconstruction data of the 12 components to output as final filter data. By adoption of themethod, data noise can be effectively eliminated, and a single-to-noise ratio of the data is increased.

The invention provides a full-tensor gravity gradiometer data quality evaluation and filtering processing method. The method comprises the following steps: carrying out noise estimation on each gradient component measured by a full-tensor gravity gradiometer through an odd-even grid analysis method; constructing a weighted joint inversion filtering equation according to weight of each gravity gradient component determined by a noise estimation result and a Fourier series solution of a Laplace equation; solving a Fourier series coefficient in the weighted joint inversion filtering equation by utilizing an optimal linear inversion method; and carrying out forward calculation by using the Fourier series coefficient obtained by calculation to obtain a filtering result. According to the full-tensor gravity gradiometer data quality evaluation and filtering processing method provided by the invention, effective high-frequency effective gravity gradient information can be reserved while a high-frequency noise of measurement data of the full-tensor gravity gradiometer is removed, and precision and a resolution of filtered result data are remarkably improved.