12 results about "Absolute gravity" patented technology

The invention discloses a long endurance gravity measurement method and device for enhancing relative gravity measurement precision based on absolute gravity information, and relates to the technical field of gravity measurement, and the method comprises the steps: obtaining an absolute gravimeter gravity data sequence and a relative gravimeter gravity data sequence; obtaining a relative gravimeter long-period error observation information sequence according to the absolute gravimeter gravity data sequence and the relative gravimeter gravity data sequence; preprocessing the relative gravimeter long-period error observation information sequence, and obtaining a relative gravity information error constraint relation model based on the preprocessed relative gravimeter long-period error observation information sequence; and the relative gravity information error constraint relation model is adopted to predict the relative gravity information error in a period of time in the future, and error compensation is completed. According to the invention, the absolute gravimeter and the relative gravimeter are jointly used to realize advantage complementation, and the gravity information is measured at high precision in a long-endurance dynamic scene.

The application discloses a steel pipe pile sinking verticality real-time closed-loop control system based on a gravity reference, and relates to the technical field of pile foundation engineering construction. The application takes absolute gravity as a unified reference, obtains offset data through full-pile-body multi-section coaxial measurement, solves pile body deflection deformation, and realizes hierarchical collaborative closed-loop control of preferential deviation correction of the middle and lower sections of the pile body. The application has the following advantages. A full-pile-body coaxial measurement module is arranged along the inner wall of the steel pipe pile, cooperates with a gravity reference establishment module penetrating the whole section of the steel pipe pile, obtains offset data of multiple sections of the whole section of the pile body relative to the unified gravity reference, and then a pile body deflection solving module is used to obtain the real deflection deformation curve of the whole section of the pile body. The application breaks the industry's common cognitive limitation that the steel pipe pile is an ideal rigid body and that the verticality of the pile top represents the verticality of the whole pile body, and effectively solves the industry's pain point that the existing technology cannot identify and cannot intervene in the hidden deflection deformation of the middle and lower sections of the pile body in advance.

The invention belongs to the technical field of absolute gravity high-precision measurement, and discloses a falling type absolute gravity measuring device with multiple observation windows, which comprises a metal cavity and a laser collimator. According to the falling type absolute gravity measuring device with the multiple observation windows, the number of the windows is increased in an atomic group trapping and detecting area, so that atomic group observation is more convenient, more atomic group movement information can be obtained, and convenience is provided for development of more detailed research.

The invention discloses a novel gravity measurement method based on the combination of an atomic gravimeter and a classical accelerometer. The method comprises the following steps: S1, carrying out synchronous measurement by using the atomic gravimeter and the classical accelerometer; s2, on the basis of a quantum-classical hybrid method, dynamic gravity measurement is carried out in combination with a vertical output signal of a classical accelerometer; and S3, a variational Bayesian adaptive unscented Kalman filter (VBAUKF) algorithm is adopted. According to the method, a feasible technical scheme is provided for high-precision ocean gravity measurement, a new thought is developed for research in related fields, and the method has important theoretical value and engineering application significance; by dynamically combining the advantages of the atomic gravimeter and the classical accelerometer, large-range, high-sampling-rate, high-precision and zero-drift-free absolute gravity value measurement is realized, and the measurement precision and reliability of the system are remarkably improved.

The invention discloses a field programmable gate array (FPGA) time sequence control algorithm for a marine atom gravimeter, and relates to the technical field of high-precision gravity matching navigation.According to the system, a front-end optical subsystem, a rear-end optical subsystem and an upper computer data processing module are set up, high-precision synchronous control over multiple paths of signals is achieved in combination with an FPGA, and an interference fringe resolving method for Bayesian inference cosine estimation is adopted, so that high-precision synchronous control over the multiple paths of signals is achieved. And the synchronization performance and the gravity measurement precision of each module of the atom marine gravimeter are effectively improved. According to the method, the external coincidence precision of gravity measurement is improved to 0.8 mGal while the stability of the system is ensured, the requirements of ocean dynamic absolute gravity measurement are met, and the method can be widely applied to the fields of resource exploration, passive navigation, geophysical research and the like.

The application discloses a device and method for calibrating microsphere displacement in an optical trap by using absolute gravity acceleration. The device comprises an optical power adjusting module. An optical trap capturing light is emitted by a light source, and after the optical power adjusting, the light is incident on the microsphere and acts on the microsphere, and after the action, the light is emitted to a displacement detection module and is received by the displacement detection module. First, the capturing light is turned off to make the microsphere freely fall, and after falling for a distance, the capturing light is turned on again to capture the microsphere again, so that the microsphere performs under-damped oscillation movement. After a period of time, the microsphere returns to a stable capturing state, and the microsphere oscillation signals of each cycle are repeatedly recorded. The local gravity acceleration is taken as an absolute standard, a theoretical oscillation curve is calculated, and calibration is performed. The application greatly enhances the reliability and traceability of the optical trap detection system, and can calibrate a nonlinear detection system. The device and method avoid setting a complex detection system calibration device, and greatly reduce the complexity and debugging difficulty of the system.

The invention belongs to the technical field of geodetic survey and geophysical exploration, and discloses a real-time gravitational potential measurement method and device combining an unmanned aerial vehicle and Beidou, and the method comprises the steps: 1, carrying out the system calibration; before execution of a flight task is started, the unmanned aerial vehicle is parked at a ground calibration reference point with a known gravity position for static observation; step 2, real-time Beidou data acquisition; the unmanned aerial vehicle flies according to a preset route, and each track point is observed for a certain time; step 3, real-time receiver clock error calculation; establishing an observation equation on the current track point, and calculating the three-dimensional coordinate of the current track point and the clock error of the GNSS receiver; 4, resolving the gravity potential; calculating an absolute gravitational potential value of any point on the flight path of the unmanned aerial vehicle by combining the receiver clock error obtained during flight calibration of the unmanned aerial vehicle in the step 1; and step 5, data output and mapping. High-precision gravity potential measurement is completed on the mobile platform, and the limitation that traditional gravity measurement depends on static observation or ground arrangement is broken through.

The application discloses an absolute gravity acceleration calibration method, relates to the field of acceleration calibration, and mainly has the following scheme: a plurality of candidate regions are preliminarily determined by collecting data of polar regions; bedrock stability data are collected to calculate a bedrock stability coefficient of each candidate region, and a candidate region meeting requirements is screened; a gravity standard platform is cast at a site target point; equipment guarantee reliability is calculated based on operation data, and whether the equipment state meets standards is judged according to the equipment guarantee reliability; when the equipment state meets the standards, gravity measurement data quality factors are calculated according to gravity measurement data, and whether the data collected by the gravity measurement equipment meets requirements is judged; when the collected data meets the requirements, gravity acceleration calibration values are further calculated; by systematically considering factors such as bedrock stability, equipment guarantee reliability, gravity data quality factors and interference suppression coefficients, the scheme can significantly improve the accuracy and reliability of absolute gravity acceleration calibration.

The present application belongs to the field of geodetic survey and geophysical exploration, and discloses a real-time gravity potential measurement method and device combining unmanned aerial vehicle and Beidou, which comprises the following steps: step 1: system calibration; before the start of flight task execution, the unmanned aerial vehicle is parked on a ground calibration reference point with known gravity potential for static observation; step 2: real-time Beidou data acquisition; the unmanned aerial vehicle flies according to a preset route, and each trajectory point is observed for a certain time; step 3: real-time receiver clock error solving; an observation equation based on the current trajectory point is established to solve the three-dimensional coordinates and GNSS receiver clock error of the current trajectory point; step 4: gravity potential solving; the absolute gravity potential value of any point on the flight trajectory of the unmanned aerial vehicle is solved in combination with the receiver clock error obtained during the flight calibration of the unmanned aerial vehicle in step 1; and step 5: data output and mapping. The present application completes high-precision gravity potential measurement on a mobile platform, and breaks through the limitation of traditional gravity measurement relying on static observation or ground layout.

The application discloses an absolute gravimeter and a measuring method capable of measuring absolute gravity or gravity vertical gradient. The absolute gravimeter comprises a vacuum falling body system, an upper support adjusting system, a laser interference system, a vibration isolation system and a lower support adjusting system. The vacuum falling body system and the vibration isolation system are designed as cavities with interchangeability of the same connection interface, so that the positions of the two systems in the instrument erection process of different measurement modes are interchanged. The falling body prism in the vacuum falling body system and the reference prism in the vibration isolation system are both designed as a combination of bidirectional pyramidal prisms. In a high position measurement mode, the vacuum falling body system is above and the vibration isolation system is below, and the absolute gravity value at the high position is measured; in a low position measurement mode, the vibration isolation system is above and the vacuum falling body system is below, and the absolute gravity value at the low position is measured. The absolute gravity values at the high position and the low position are obtained through the two measurement modes respectively, and the effective height corresponding to the falling body is recorded, so that the measurement of the gravity vertical gradient is realized.

The invention provides an absolute gravity measurement data tamper-proofing method and system based on a geophysical law and chained Hash. The method comprises the following steps: continuously acquiring actually measured gravitational acceleration values, space coordinates and timestamps of a plurality of measurement points along a preset measurement path; calculating a gravitational acceleration residual error of each measuring point; performing Hash operation on each measuring point to generate a chain type joint feature code; taking the chained joint feature codes of all the measuring points as leaf nodes, constructing a Merkle binary tree and obtaining root hash; writing the data into a block chain for evidence storage; and when data verification is needed, the steps are executed again to obtain a new root hash, the new root hash is compared with the stored root hash, and if the new root hash is compared with the stored root hash, it is judged that tampering exists in the measured data. According to the method, the geophysical law is introduced as an endogenous security element, and the cryptography and block chain technology are combined, so that attacks such as single-point data tampering and measuring point sequence rearrangement can be effectively detected, and full-link security guarantee from a physical source to digital evidence storage is provided for high-value gravity measurement data.

The utility model discloses a floating type absolute gravimeter falling body adjusting tool. The falling body adjusting tool comprises a falling body bearing ring, a falling body adjusting device, a suspension supporting structure and a tool support. The falling body is fixedly arranged in the falling body bearing ring; the falling body adjusting device is arranged on the falling body and used for adjusting the mass center of the falling body; the falling body bearing ring is fixed to the tool support in a suspension mode through the suspension supporting structure. According to the floating type absolute gravimeter falling body adjusting tool, the falling body is fixedly installed on the falling body bearing ring, the falling body bearing ring and the falling body on the falling body bearing ring are fixedly supported in a suspension mode, contact friction between the tool and the falling body bearing ring is avoided, the contact friction force is eliminated, meanwhile, the mass center of the falling body is adjusted through the falling body adjusting device, and therefore the falling body adjusting efficiency is improved. The step of measuring by using a high-precision electronic scale is omitted, the adjusting efficiency and the adjusting precision are improved, the centroid deviation of the falling body can be directly observed through gravity, and the centroid deviation observation effect is improved.