92 results about "Gravimeter" patented technology

The invention relates to the field of gravity measurement, and aims to provide a small-size high-precision gravimeter based on an anti-magnetic suspension principle. The gravimeter comprises a low-frequency magnetic potential well unit, a suspension mechanical oscillator unit, a displacement detection unit and a cavity enclosing unit, and lens groups of the low-frequency magnetic potential well unit, the suspension mechanical oscillator unit and the displacement detection unit are all located in a cavity of a heat preservation shell on the innermost side. According to the invention, a measurement environment without external influence can be provided for the displacement detection of the suspension oscillator, the adjustment of the frequency in the vertical direction in a magnetic suspension potential well is resisted, the movement of an object to be measured is reflected by the voltage fluctuation brought by the laser intensity change measured by the photoelectric converter, and the high-precision gravity measurement is realized; the vibrator adopts a magnetic suspension mode and does not make mechanical contact with the environment, and long-term irreversible deformation can be avoided; and a temperature control and magnetic shielding device or other auxiliary equipment with a large volume is not needed, so that the gravimeter is small in overall size, convenient to move, low in cost and beneficial to popularization.

The invention relates to an alkaline miscellaneous rock type niobium ore prospecting method, which belongs to the technical field of geological prospecting, and comprises the following steps: systematically carding regional geological structure evolution and stratum lithology distribution, and mastering the distribution range, rock type and geological age of alkaline miscellaneous rocks; a gravimeter is adopted for measurement, and gravity abnormal data are obtained; the method comprises the following steps: collecting sediment samples in a water system in a target area, analyzing the content of niobium in the sediment, collecting surface and deep soil samples in a niobium element enrichment area, analyzing the content of the niobium element, collecting remote sensing image data in the target area, highlighting geological information related to alkaline miscellaneous rocks, and calculating the content of the niobium element in the target area. Comprehensively analyzing the remote sensing image, and delineating a possible mineralization alteration area; establishing a comprehensive database, and delineating a target region with the highest prospecting potential; sampling is conducted in the delineated target area, and the ore body position, scale and grade of the alkaline miscellaneous rock type niobium ore are determined. By comprehensively applying various technical means, the prospecting accuracy and efficiency are improved.

Systems and methods described integrate a strapdown gravity sensor such as a gravimeter on an unstaffed aerial vehicle to conduct gravity prospecting for identifying surface and subsurface features of interest.

The invention discloses a gravity value extraction method based on orthogonal distance minimization, relates to the field of gravity meter interference fringe fitting gravity value extraction method design, and solves the problems that in the prior art, when interference fringe fitting is carried out, phase extraction of interference fringes faces many problems, and then the measurement efficiency and precision of an atomic gravity meter are limited. According to the method, related parameters of interference fringes are initialized; setting a minimum sum of orthogonal distances from the data points to the curve as an optimized objective function; fitting the interference fringes by adopting a self-adaptive cuckoo search algorithm; according to the method, when the target function is optimized, multiple optimization strategies are introduced into the self-adaptive cuckoo search algorithm, the global search capability of the algorithm is improved, and the method can be better applied to a scene of gravity value extraction. According to the method, the extraction precision of the gravity value can be improved to a certain extent.

The invention discloses an absolute relative gravimeter combined measurement method. The method comprises the following steps: S1, taking a drift error of a strapdown relative gravimeter, a change rate of the strapdown relative gravimeter, other errors of the strapdown relative gravimeter, a change rate of the other errors of the strapdown relative gravimeter, and an error of an atomic interference absolute gravimeter and a change rate of the atomic interference absolute gravimeter as system states; s2, taking the difference of gravity anomalies measured by the two gravimeters as measurement, and constructing a combined measurement model; and S3, predicting a reliable error state through robust Kalman filtering based on a maximum entropy criterion. According to the method, the characteristics of an atom interference absolute gravimeter and a strapdown gravimeter are combined to complement each other, the precision and reliability of open sea gravity measurement are effectively improved, and the method is practical and has wide application prospects. The problems of strapdown relative gravimeter drift error accumulation and poor dynamic performance of an atomic interference absolute gravimeter during open sea measurement are effectively solved, through combined measurement of the strapdown relative gravimeter and the atomic interference absolute gravimeter, it is avoided that the relative gravimeter needs to return at regular time for drift error calibration, and the gravity measurement precision is improved.

The present invention relates to the technical field related to atomic gravity measurement and provides a steady-state identification method based on the multi-factor and multi-dimensional characteristics of a cold atom absolute gravimeter. The method comprises: S1, at each steady-state level, collecting historical data of hull operation based on the cold atom absolute gravimeter, the historical data including the acceleration and inclination of the hull, and the atomic number data of the cold atom absolute gravimeter; S2, dividing the acceleration, inclination, and atomic number data into feature groups to form a multi-factor and multi-dimensional hull steady-state feature matrix; S3, establishing a hull steady-state identification model based on the hull steady-state feature matrix and a machine learning algorithm, and cross-validating the hull steady-state identification model; S4, identifying the hull steady-state based on the cross-validated hull steady-state identification model and the currently collected hull acceleration, inclination, and atomic number data. The present invention further improves the accuracy of hull stability identification based on the multi-factor and multi-dimensional information of the ship-borne cold atom absolute gravimeter.

The invention discloses a method for monitoring the relative gravity of surface subsidence in a coal mining process, and the method comprises the steps: arranging a quantum gravity base station at the periphery of a subsidence area, deploying a relative gravimeter in a basin according to a grid, arranging a fiber grating gravity sensing chain in an underground crossheading, and carrying a cold atom gravity gradiometer by adopting an unmanned plane for periodic scanning. A gravitational field-mass migration model is established based on real-time data, coal mining volume, rock stratum density change and earth surface gravity anomaly are associated, geological background interference is eliminated through wavelet multi-scale decomposition, and a gravity change value is optimized through hydrological correction in combination with water level and porosity. And when the corrected gravity change exceeds a threshold value, calculating a rock stratum fracture azimuth angle by using a gravity gradient tensor, inverting an equivalent mining thickness based on the gravity change, dynamically predicting a surface subsidence form in combination with a subsidence basin model, constructing a state vector in combination with gravity, gradient and deformation data, and realizing multi-source fusion prediction through a filtering algorithm.

The invention discloses a gravimeter for geophysical exploration, and belongs to the technical field of geophysical exploration, the gravimeter comprises a dustproof shell, a cleaning assembly, a connecting assembly, a driving assembly and a filtering assembly, the dustproof shell comprises a shell, one side of the shell is provided with an air inlet, the other side of the shell is provided with an exhaust port, the exhaust port is internally connected with a filter screen, and the filter screen is connected with the cleaning assembly. An operation screen and a socket are arranged on the front face of the shell, a sensor assembly is arranged in the shell, the cleaning assembly comprises a rotating frame, the rotating frame is rotationally connected into the shell, two first cleaning brushes are connected into the rotating frame, and the two first cleaning brushes are in lap joint with the two sides of the shell respectively; according to the invention, the dustproof shell, the first filter plate and the second filter plate are arranged, and the dustproof shell, the first filter plate and the second filter plate cooperate with each other to perform triple blocking on external dust, so that the external dust is not liable to be attached to the surface of the sensor assembly, and the measurement precision and the service life of the sensor assembly are not affected.

The invention relates to a gravimeter calibration error compensation system, which belongs to the technical field of geophysical exploration, and comprises a double-layer decoupling and environment sensing module used for acquiring external environment parameters and internal structure strain vectors in real time; the quantum state pre-compensation module is used for responding to external environment parameters and resolving pre-compensation control parameter vectors based on a preset pre-compensation model, the measurement basis is purified, extremely favorable initial conditions are created for subsequent fine correction, the effect of the quantum state pre-compensation system is far better than that of a passive or static scheme in the prior art, and the measurement accuracy is greatly improved. The scalpel type stripping of dynamic structure interference is realized, the purity of the generated corrected gravity value is ensured, and the inherent contradiction that a precise instrument is either precise but easy to lose efficacy or reliable but low in precision in a severe environment is solved.

The invention discloses a gravimeter temperature control system modeling control method, and relates to the technical field of precise instrument temperature control, and the method comprises the steps: 1, obtaining the real-time running speed of a carrier, the wind speed of an external environment, and the current temperature of a core part of a gravimeter; step 2, feed-forward compensation power is calculated based on the real-time driving speed and the external environment wind speed according to preset dynamic thermal disturbance model parameters; 3, based on the difference value between the current temperature and the preset target temperature, feedback control power is calculated through a preset feedback control algorithm; 4, superposing the feed-forward compensation power and the feedback control power to generate total control power, and outputting the total control power to control the heating actuator. Predictive disturbance compensation is achieved, temperature overshoot is effectively restrained, the thermal stabilization time is remarkably shortened, the operation efficiency is improved, the data quality is improved, the measurement reliability is enhanced, and the method is suitable for large-scale popularization and application. Practicality is high, compatibility is good, and upgrading and reconstruction are easy.

The invention belongs to the technical field of precision measurement, and relates to an indoor movable base testing device for a horizontal tensor gravity gradiometer and application of the indoor movable base testing device. The device comprises a control processing module, and a gravity gradient standard field generation module and a motion simulation module which are respectively connected with the control processing module, the motion simulation module and the gravity gradient standard field generation module are both fixed on a foundation, and the gravity gradient standard field generation module comprises an electric displacement table; a pair of attraction source assemblies arranged in an orthogonal mode is fixed to the electric displacement table. The horizontal tensor gravity gradiometer to be measured is arranged on the motion simulation module and located between the pair of gravitation source assemblies; the control processing module is used for driving the motion simulation module to simulate the environment of the movable base, and is also used for enabling the gravitation source assembly to translate on the electric displacement table and generating a gravity gradient standard field dynamically matched with the motion of the gravitation source assembly. According to the invention, the performance verification of the horizontal tensor gravity gradiometer under the condition of simulating the movable base can be realized, and the test cost and period are reduced.

A gradio-gravimeter comprising at least two vehicles (V1, V2), each with an inertial measurement unit (IMU1, IMU2) and a control unit (COM1, COM2) for guiding the vehicles along trajectories with separate segments for performing IMU flips and coupled segments for exchanging inertial measurements. At least one of the electronic control units is configured to determine, notably from the exchanged measurements: a transition matrix between inertial frames, a correction of linear acceleration measurements using an observed accelerometric model, a correction of angular velocity measurements using an observed gyrometric model, and a gravitational field gradient. Navigation system comprising such a gradio-gravimeter. FIGURE IN ABRIDGED DIAGRAM: Fig. 1

A gravity value extraction method based on orthogonal distance minimization relates to the field of design of gravity value extraction methods using gravimeter interference fringe fitting. It addresses the numerous difficulties faced in extracting the phase of interference fringes during interference fringe fitting in the prior art, which in turn limits the measurement efficiency and accuracy of atomic gravimeters. The method of the present invention is implemented by initializing interference fringe-related parameters; setting the minimum sum of the orthogonal distances from data points to the curve as the optimization objective function; fitting the interference fringes using an adaptive cuckoo search algorithm; and calculating the gravity value based on the phase obtained after fitting. When optimizing the objective function, the method uses an adaptive cuckoo search algorithm that introduces multiple optimization strategies, improving the algorithm's global search capability and enabling better application in gravity value extraction scenarios. The method of the present invention can improve the accuracy of gravity value extraction to a certain extent.

This invention discloses an absolute gravimeter based on a Michelson laser, characterized by comprising a Michelson laser, a spectrum analyzer, a vacuum cavity, a vibration isolation system, and a data processing unit; wherein, the front cavity mirror, laser gain medium, beam splitter, and feedback output mirror of the Michelson laser are placed sequentially along the horizontal optical axis; a falling prism and a reference prism are placed along the vertical optical axis; the beam splitter is located at the intersection of the horizontal and vertical optical axes; the horizontally oscillating optical path is used as the reference optical path, and the corresponding laser is used as the reference laser; an oscillating optical path outside the reference optical path is used as the measurement optical path, and the corresponding laser is used as the measurement laser; the spectrum analyzer is placed after the feedback output mirror to measure the beat frequency signals of the reference laser and the measurement laser; the data processing unit is used to perform a secondary fitting based on the clock signal corresponding to each beat frequency signal measurement point and the calculated falling trajectory data of the falling prism to obtain the gravitational acceleration value.

The utility model discloses an observation windproof device of a relative gravimeter, and relates to the technical field of relative gravity measurement. Comprising windproof pieces which are made of thin plates, a plurality of windproof pieces are hinged in a matched mode to form a windproof piece chain, and two windproof pieces at the head and the tail of the windproof piece chain are connected in a matched mode to form a closed ring. The wind-proof device has the beneficial effects that the wind-proof device for the relative gravity observation is convenient to use, simple to operate and good in wind-proof effect; during transportation, a plurality of windproof pieces can be matched and hinged to form a windproof piece chain to be folded and stored, so that the space is saved; during observation, the relative gravimeter is placed in a closed ring formed by connecting the two windproof pieces at the head and the tail of the windproof piece chain in a matched mode, the relative gravity observation windproof device resists the influence of wind power, a stable external environment is provided for observation of the relative gravimeter, and a guarantee is provided for obtaining accurate observation data.

The invention discloses an absolute gravimeter based on an optical lattice clock and a working method thereof, and belongs to the technical field of gravity measurement. The absolute gravimeter comprises an optical lattice clock physical device, a lattice light laser, a first polarization beam splitter prism, a first optical reference cavity, a second polarization beam splitter prism, an optical frequency comb, a first acoustic optical modulator, a first linear polarization polarizer, a convex lens, a concave reflector, a clock laser laser, a third polarization beam splitter prism and a second optical reference cavity. And a second acousto-optic modulator and a second linear polarization polarizer. Different from a traditional absolute gravimeter based on laser interference and atom interference, the absolute gravimeter provided by the invention has the advantages that the gravitational acceleration sensed by atoms can be determined by measuring the Watille-Stark sideband spacing in a shallow light lattice and the lattice light wavelength along the gravity direction of the light lattice; the absolute gravimeter has the potential of reducing the measurement error of gravity acceleration to 0.1 mu Gal or even lower, and the precision of the absolute gravimeter is higher than that of a traditional absolute gravimeter by more than one order of magnitude.

The invention provides a shipborne marine gravimeter quasi-static test evaluation method and device, belongs to the technical field of marine geophysical measurement, adopts a dual correction mechanism to reconstruct the structural composition of a data processing function module, and specifically adopts a technical means of synchronously collecting GNSS elevation change data to realize accurate measurement. The GNSS positioning system is rigidly connected with the gravimeter to continuously record elevation change data of the ship; calculating a gravity correction value caused by elevation change; the earth tide correction value and the elevation change correction value are deducted from gravity observation data at the same time, the accurate residual observation quantity is obtained, the technical inertia that in the prior art, only earth tide correction is considered, but the elevation change influence is ignored is broken, the GNSS system is ingeniously used for recording the ship elevation change condition, and a dual correction mechanism is adopted; the problem that the evaluation result is inaccurate due to the fact that the ship fluctuates along with the tide level in a wharf mooring test is solved, and then the technical effect of accurately evaluating the performance of the gravimeter in the quasi-static environment is achieved.

This invention relates to the field of gravity measurement, aiming to provide a small-sized, high-precision gravimeter based on the principle of antimagnetic levitation. The gravimeter includes a low-frequency magnetic potential trap unit, a levitation oscillator unit, a displacement detection unit, and a cavity enclosure unit. The lens groups of the low-frequency magnetic potential trap unit, the levitation oscillator unit, and the displacement detection unit are all located in the cavity of the innermost insulated shell. This invention provides a measurement environment free from external influences for displacement detection of the levitation oscillator, counteracts adjustments to the vertical frequency in the antimagnetic levitation potential trap, and uses a photoelectric converter to measure voltage fluctuations caused by changes in laser intensity to reflect the motion of the object under test, achieving high-precision gravity measurement. The oscillator uses magnetic levitation and does not have mechanical contact with the environment, avoiding long-term irreversible deformation. It eliminates the need for bulky temperature control and magnetic shielding devices or other auxiliary equipment; therefore, the overall size of the gravimeter is small, easy to move, and inexpensive, facilitating widespread adoption.

The disclosed embodiment discloses a positioning method, device, equipment, medium and product, the method comprising: obtaining gyroscope data and linear acceleration data at a first moment, and gravimeter data and magnetometer data at a second moment; obtaining step detection results and step length estimation results according to the linear acceleration data; calculating according to the gravimeter data and the magnetometer data to obtain a first quaternion at the second moment; calculating according to the gyroscope data and the first quaternion to obtain a second quaternion at the second moment; obtaining a conversion matrix and a first heading angle of a target device at the second moment according to the second quaternion, and obtaining a second heading angle of the target device in a first time period according to the first heading angle, the gyroscope data and the conversion matrix; obtaining the position of the target device in the second time period according to the second heading angle, the step length estimation result and the position of the target device in the first time period. The position of the second time period obtained by this solution has a high accuracy, which improves the user experience.

The invention discloses an air route planning method for measuring a gravity short wave component by a marine gravimeter. The method comprises the following steps: S1, converting a gravity database into a grid map; s2, planning an air route from a starting node to a target node on the grid map by using an A * algorithm and a set node evaluation function; wherein the node evaluation function is obtained by weighted summation of an actual cost function and a heuristic cost function, the actual cost function represents the change intensity of the gravity abnormal value along the air route, and the heuristic cost function represents the navigation distance estimation value from the current node to the target node. According to the method, efficient and accurate acquisition of the gravity short-wave component in the target area is realized.

The invention relates to a time synchronization method for measured data of a gravimeter, and aims to improve the time mark accuracy of the measured data. According to the method, the theoretical timing cycle and the actual timing cycle of a sampling timer are compared, the timing cycle number deviation is calculated, and distribution of sampling pulses is adjusted according to the timing cycle number deviation, so that the data time mark of measured data of the gravimeter is determined. Furthermore, by analyzing inertial navigation data and satellite navigation data, a data synchronization residual error is obtained, a data time mark is corrected according to the data synchronization residual error, and accurate time synchronization of measured data of the gravimeter is achieved.

Sensor data fusion systems that provide noise reduction and fault protection. The sensor data fusion system fuses data acquired by respective accelerometers having different attributes. For example, one accelerometer has low noise and high bias, while another accelerometer has high noise and low bias when measuring specific force. The high-noise, low-bias accelerometer may be a gravimeter. Gravimeters and traditional accelerometers measure the same physical variable, i.e., specific force. By combining an expensive gravimeter and low-cost accelerometers, a synthetic sensor having both low noise and low bias may be achieved. Such synthetic sensors may be utilized in a gravity anomaly-referenced navigation system to achieve improved navigation performance.

The present invention provides a method and device for compensating for horizontal acceleration errors in a mobile atomic interferometer gravimeter. Within a single measurement cycle, the method obtains the gravitational phase shift based on the interference loop formed by the interaction between a Raman light pulse sequence and a cold atomic cluster. The method also obtains information on the relative position change of the cold atomic cluster within the horizontal cross-section of the Raman light pulse sequence. Based on this relative position information and pre-acquired characterization information, the method obtains the effective Rabi frequency under the action of horizontal acceleration. The effective Rabi frequency is then compensated to reduce the impact of horizontal acceleration on the atomic interferometer gravity measurement process. Based on the relative position change information and the characterization information, the method obtains the wavefront phase shift introduced by the horizontal acceleration. Based on the wavefront phase shift and the gravitational phase shift, the method obtains a corrected gravitational phase shift. The method then obtains the single-cycle gravitational acceleration based on the corrected gravitational phase shift. This method improves the measurement accuracy of the atomic interferometer gravimeter.

The present application relates to a strapdown dynamic gravity measurement method and device for mixed surface and underwater operations. The method comprises: determining the current state of a gravimeter through an autonomous detection system during navigation, and constructing a surface or underwater strapdown dynamic gravity measurement system based on the determination result; performing gravity measurement using the strapdown dynamic gravity measurement system, and calculating raw gravity anomaly values ​​based on high-precision velocity, position, and attitude information; filtering using a low-pass filter to obtain effective gravity anomaly results; constructing a celestial accelerometer drift model for the current voyage based on a segment of initial celestial relative force and a segment of final celestial relative force; and calibrating the effective gravity anomaly results using the initial celestial relative force, the celestial accelerometer drift model, and the gravity value of the gravimeter's onshore reference point to obtain the final gravity measurement result. This method can realize strapdown dynamic gravity measurement for mixed surface / underwater operations.

The invention discloses a gravity measurement and calculation system, and relates to the technical field of geophysical measurement and precise instruments. The system comprises a gravity measurement module, a dynamic correction module, a calculation module and a result output and early warning module. The method comprises the following steps: acquiring 0.1 nGal-level gravity data through an atomic interference type quantum gravimeter array; dynamically updating an energy component correction term epsilon (g) in the empirical equation by using an adaptive learning algorithm based on a Lyapunov stability criterion, and ensuring asymptotic stability of the system under high-frequency data flow; combining a real-time density value of a CRUST1.0 density model after Bouge correction, and accurately calculating the earth radius variation; and finally, through 5G and satellite double-link redundant communication, triggering early warning when severe conditions that delta g is greater than or equal to 2 mu Gal for continuous 30 minutes, and SNR is greater than or equal to 6 dB are met. According to the invention, high-precision quantum sensing, a stability control algorithm and a real-time geophysical model are deeply fused, reliable monitoring of micron-sized change of the earth shape and effective early warning of geophysical events are realized, and the method has high precision, high stability and high engineering practicability.

The embodiment of the invention provides a noise filtering method, device and equipment for angular vibration of a gravimeter while drilling, a computer readable storage medium and a computer program product. The method comprises the following steps: acquiring a target signal from acceleration signals measured by an x-axis gravimeter and a y-axis gravimeter; the target signal is a gravity component which is generated by rotation of the drilling tool and changes periodically along with the direction; filtering a first angular vibration noise component corresponding to the axial direction from the acceleration signal in each axial direction to obtain a first output signal in each axial direction; wherein the first angular vibration noise component in the same axial direction and the target signal are same in frequency, different in phase and not opposite in phase; filtering a second angular vibration noise component in the corresponding axial direction from the first output signal in each axial direction; wherein the second angular vibration noise component in the same axial direction and the target signal are same in frequency and phase and / or same in frequency and opposite in phase. According to the method, the angular vibration noise of the gravimeter can be filtered more accurately.

The invention discloses a cold atom gravimeter frequency increasing method based on a long short-term memory network-exponential moving average algorithm, and relates to the field of cold atom gravimeter measurement and the like. In order to solve the defects that in the prior art, a cold atom gravimeter is low in output frequency, and high precision and high frequency are difficult to consider at the same time, the technical scheme provided by the invention comprises the following steps: acquiring original gravitational acceleration data output by the cold atom gravimeter and obtaining noise reduction data; performing linear interpolation on the noise reduction data to generate a continuous input sequence for training and predicting the long and short-term memory network; outputting a gravitational acceleration predicted value at the next moment according to the continuous input sequence; generating a frequency boosting sequence formed by combining the measured data and the predicted data according to the predicted value; and obtaining final high-frequency gravitational acceleration output data. The method is suitable for obtaining high-precision and high-frequency gravitational acceleration data in geological exploration, gravity matching navigation and geophysical monitoring.

The invention discloses a flowing type relative gravimeter, and relates to the technical field of oil-gas exploration equipment. The relative gravimeter comprises a relative gravimeter main body, the front side of the relative gravimeter main body is fixedly provided with a display screen, the top circumference of the relative gravimeter main body is uniformly and fixedly provided with three gradienters, the bottom of the relative gravimeter main body is provided with a supporting device, and the supporting device comprises three side frames. And the three side frames are circumferentially and uniformly fixed on the outer wall of the lower part relative to the gravimeter main body. Through the arrangement of the supporting device, the relative gravimeter main body, the bottom plate, the screw and the screw block are matched to drive the insertion plate to be inserted into the ground, so that the stability of the relative gravimeter main body on the ground can be effectively improved, and the relative gravimeter main body is prevented from being interfered by external vibration or movement; the friction force of contact between the inserting plate and the land can be increased, and therefore higher road holding force is provided.

The embodiment of the invention provides a noise filtering method, device and equipment for transverse vibration of a gravimeter while drilling, a computer readable storage medium and a computer program product. The method comprises the following steps: acquiring an acceleration signal measured by a triaxial gravimeter and a magnetic force signal measured by a z-axis magnetometer; acquiring signal components with the same frequency of the acceleration signal and the magnetic signal in each axial direction; acquiring a target signal component having a specific phase difference with the magnetic signal from the signal components in each axial direction; and filtering target signal components in the corresponding axial directions from the acceleration signals in the axial directions. According to the method, the transverse vibration noise of the gravimeter can be filtered more accurately.