139 results about "Geodetic survey" patented technology

The invention discloses an InSAR (Interferometric Synthetic Aperture Radar) and GNSS (Global Navigation Satellite System) robust adaptive fusion method for high-precision three-dimensional surface deformation monitoring, which belongs to the technical field of space geodetic survey and remote sensing, and comprises the following steps of: constructing a time sequence deformation field based on a small baseline set time sequence InSAR processing technology, and resampling GNSS observation data to a grid consistent with the InSAR by using Kriging spatial interpolation; a Helmert variance component estimation method is adopted to adaptively estimate variance components of InSAR and GNSS data, and reasonable weight fixing of a multi-source observation value is achieved; iterative reweighted least square estimation is introduced, outlier influences in various observation data are dynamically restrained through a Tukey double-weight function, robust optimization of a fusion model is achieved, and therefore a high-precision three-dimensional deformation field is reconstructed. The method comprises the steps of Helmert weight fixing, IRLS robust, variance component updating and a closed-loop feedback mechanism of weight matrix optimization.

The invention relates to a coal mine equipment cooperative control system based on digital twinning, and belongs to the field of coal mine intellectualization. According to the system, the equipment state, environmental parameters and fault data are acquired in real time through the data acquisition layer; the data processing layer realizes multi-source data fusion and fault prediction by using a deep fusion neural network and a space-time attention network; the digital twinborn layer constructs a three-dimensional dynamic model based on unified geodetic coordinate system coupling equipment and geodetic survey information; and the control layer adopts a distributed stream computing framework to execute collaborative scheduling, active disturbance rejection speed control and fault prediction compensation. The problems that in the prior art, spatial position expression is missing, collaborative delay is high, data are not synchronous, and complex working condition adaptability is poor are solved. The method has the beneficial effects that total-factor high-precision space coupling is realized, the collaborative delay bottleneck is overcome, the adaptability to complex working conditions is enhanced, a closed-loop intelligent optimization system is constructed, and full-chain transparent management and control of the coal mine are promoted.

The invention relates to a method and device for determining a lunar gravity field by using an inter-satellite frequency signal time-frequency link, and the method comprises the steps: connecting an earth observation station, a static satellite and a lunar polar orbit satellite which are provided with an atomic clock through a satellite carrying a clock system based on a generalized relativistic theory, and carrying out the time-frequency transmission through a satellite time-frequency transmission method, the gravity potential difference between the earth and the satellite and the gravity potential difference between the satellite and the moon polar orbit satellite are measured through a gravity frequency shift method, the gravity potential data of the moon polar orbit satellite are obtained through an inter-satellite time-frequency link according to the earth gravity potential data, and then the moon gravity field is determined through a physical geodetic measurement method. Therefore, the problems that the prior art is difficult to implement on the surface of the moon and the gravity potential of the moon and the earth cannot be connected are solved.

The invention relates to the technical field of geodetic survey and structural health monitoring, and discloses a GNSS-RTK coordinate domain error correction method, which comprises the following steps: acquiring GNSS-RTK dynamic observation data to form a mixed signal time sequence; executing an improved adaptive noise complete empirical mode decomposition algorithm on the sequence to obtain an intrinsic mode function component; identifying and eliminating high-frequency components representing Gaussian white noise based on an energy coefficient, and reconstructing residual components into a signal sequence after primary noise reduction; inputting the noise reduction sequence into a rapid independent component analysis model for blind source separation; and finally, carrying out sorting and phase and amplitude uncertainty correction on the separated independent components, and outputting a multi-path error model and a structure dynamic deformation signal. According to the method, the problem of blind source separation failure or low precision caused by strong noise covering source signal statistical characteristics is solved through a strategy of first noise reduction and then separation, and an effective physical signal can be accurately extracted from a strong noise background.

The invention discloses an ionospheric scintillation monitoring method based on a geodetic measurement receiver, which belongs to the technical field of satellite navigation, and comprises the following steps of: accurately eliminating non-scintillation errors by constructing an inter-station single-difference function model and an inter-station single-difference random model, extracting carrier phase residual errors by using a single epoch ambiguity fixing technology, and finally obtaining an ionospheric scintillation monitoring result. Establishing a reliable ionospheric scintillation monitoring index; according to the ionospheric scintillation monitoring method based on the geodetic measurement type receiver, high-precision real-time monitoring of ionospheric scintillation can be realized through a single-epoch ambiguity fixing technology under the condition of not depending on an external precision product, and reliable technical support is provided for space weather monitoring.

The invention provides a residual terrain correction estimation method based on PINNs and a residual terrain model, and relates to the technical field of geodetic survey, a data set is randomly divided into a training data set and a test data set, a residual terrain gravity anomaly of each data set is obtained through RTM as an output, the network architecture of the PINNs is a full-connection neural network, and the network architecture of the PINNs is a full-connection neural network. Associating the output quantity and the gravitational potential quantity of the RTM model according to a basic equation of physics geodetics to serve as a boundary value condition; and taking the weighted sum of the physical loss function and the data loss function as a total loss function and an initial full-connection neural network weight parameter of the full-connection neural network, training the constructed full-connection neural network through a training data set, and achieving the requirements of small calculation amount, low required data complexity and high precision through the method.

The invention discloses a three-dimensional elastic block-fault motion deformation coupling model construction method and system. Comprising the following steps: acquiring geodetic survey data of earth crust movement between earthquakes and an active fault distribution map, and dividing different active blocks; the movable blocks are associated with geodetic measurement data through spatial position attributes, and motion features of different blocks are distinguished; adjacent boundaries are extracted to serve as modeling boundary faults, and discretization processing is carried out; constructing a three-dimensional elastic block-fault motion deformation coupling model including block rotation, internal strain, fault normal velocity discontinuity counteracting, inclined fault positive slippage and negative dislocation response; inverting parameters of the three-dimensional elastic block-fault motion deformation coupling model by adopting a constrained least square method; and according to the coupling coefficient, identifying the potential pregnancy and earthquake concave-convex body on the fault. According to the method, a more complete inter-earthquake three-dimensional elastic model is established, and support is provided for accurate research of active fault coupling characteristics, recognition of gestational earthquake concave-convex bodies and judgment of major earthquake dangerous areas.

The invention relates to the technical field of geodetic survey, in particular to a method for measuring the altitude based on GNSS frequency signals of a Chinese space station. Data such as GNSS satellite precision orbits, clock errors and earth rotation parameters are obtained from an IGS analysis center, RINEX format data are obtained through synchronous observation of a space station receiver and a ground station receiver, and the gravity potential of the space station at the observation moment is determined in combination with an EIGEN-6C4 gravity field model. Deriving a frequency observation value from the carrier phase observation value, establishing an observation equation in a double-frequency ionosphere elimination processing mode, resolving the gravity potential difference between the space station and the ground station, and finally obtaining the gravity potential and the altitude of the ground station. According to the invention, traditional leveling and gravity measurement can be replaced, the cost is obviously reduced, the environmental limitation is overcome, and cross-sea and cross-ocean elevation transmission and global elevation datum unification are supported.

The invention discloses an optical fiber sensing-Beidou fusion dam safety multi-dimensional early warning system and method and application. The method comprises the steps that Beidou high-precision three-dimensional coordinate time sequences of key measuring points of a dam body and a near dam, optical fiber continuous strain fields / temperature fields (distributed) in the dam body, strain / temperature point values (quasi-distributed) of key parts and basic static information are collected; unifying a geodetic measurement coordinate system and NTP / PTP time reference, and preprocessing data; on the basis of a dam refined FEM assimilation engine, Beidou displacement is used as dynamic constraint, optical fiber data is used as verification observation quantity, EKF correction parameters are used for inverting a global stress-strain field, and Bayesian optimization is carried out to realize model evolution when residual errors are abnormal; and an M-HWI is constructed, four-level threshold values of normal-attention-early warning-alarm are compared, a response is triggered, early warning is pushed, and an abnormal region is visualized. According to the method, information islands are eliminated, the instability process is tracked in a refined manner, and the early warning accuracy, the diagnosis globality and the long-term monitoring reliability are improved.

The embodiment of the invention discloses an all-day and all-world time measurement method and device. A specific embodiment of the method comprises the following steps: constructing a short-wave infrared astronomical survey star catalogue; constructing a short-wave infrared astronomical geodetic survey star database according to the short-wave infrared astronomical survey star catalogue; optimizing the short-wave infrared astronomical geodetic survey star library to obtain an optimized short-wave infrared astronomical geodetic survey star library, and correcting atmospheric refraction errors in the optimized short-wave infrared astronomical geodetic survey star library; carrying out all-day fixed star point coordinate extraction on the shot multi-frame daytime star map to obtain fixed star point coordinates; and according to the star point coordinates of the fixed star, carrying out all-day astronomical observation world time calculation on the observation fixed star to obtain all-day world time. According to the embodiment, unified comparison of multi-period monitoring data is realized, and the engineering practicability of a monitoring result is improved.

The invention relates to methods for providing geodetic datum transformation information applicable to a region of the Earth, for use by a navigation satellite system (NSS) receiver and / or a processing entity capable of receiving data therefrom. In one embodiment, the method comprises: generating (s10a) similarity transformation parameters and, for each of a plurality of reference stations in the region, post-fit transformation residuals applicable to the reference station; and sending (s20a) the transformation parameters and output residuals applicable to output points, wherein an output residual is one of the post-fit transformation residuals or derived therefrom; and the distribution of the output points in the region depends on the distribution of the reference stations. The invention also relates to variants of the above-mentioned method, to methods for receiving and processing the geodetic datum transformation information, and to systems, computer programs, and computer program products for carrying out such methods.

The invention belongs to the technical field of space geodetic survey observation data inversion regional land water reserve change, and provides a method and related equipment for inversion of land water reserves based on a Slepian basis function combined with GNSS three-dimensional deformation, and the method comprises the steps: obtaining vertical and horizontal deformation observation values of GNSS through simulation; determining a Slepian primary function of the target area according to the boundary data and a preset maximum expansion order, and further determining a function relationship between a Slepian coefficient of GNSS three-dimensional deformation and a Slepian coefficient driven by mass load change; determining an observation equation according to the function relationship, and resolving the observation equation by adopting least square joint adjustment; and according to the Slepian coefficient driven by the mass load change, carrying out inversion on the regional land water reserves of the target region to obtain a regional land water reserve change result. The method has the beneficial effect that the precision and efficiency of regional land water reserve inversion are improved.

The invention relates to the technical field of geodetic surveying instruments and geological disaster monitoring, and discloses a geological environment displacement surveying system based on a GNSS multipath effect, and the system comprises a signal collection unit which is used for receiving a satellite signal and extracting a signal-to-noise ratio sequence; the interference feature separation unit is used for stripping a direct signal power component and generating a residual oscillation sequence; the geometric inversion calculation unit is used for generating a reference interferometric phase template in a height search domain, and generating a height-correlation map to lock the current vertical height by calculating and superposing correlation coefficients between the residual oscillation sequence and the reference interferometric phase template; according to the invention, through a spatial domain geometric matching mechanism, high-precision distance measurement is realized in a complex environment in which a satellite visual segmental arc is broken, dependence of a traditional spectral analysis method on observation duration is broken through, and signal-to-noise ratio data endogenesis is utilized to decouple observation station attitudes and environmental medium attributes. And the stability and the multi-dimensional perception capability are improved.

The invention discloses a relative motion positioning method, system and device of a multi-seabed beacon network, a medium and a product, and relates to the technical field of ocean geodetic measurement data processing, and the method comprises the steps: determining a priori value of sound velocity deviation of the multi-seabed beacon network; respectively constructing a quadratic polynomial model of each seabed beacon and a grouping adjustment function model of each sampling observation moment; initializing a quadratic polynomial model of each seabed beacon and a grouping adjustment function model of all sampling observation moments; performing iterative solution on the quadratic polynomial models of all the seabed beacons and the grouping adjustment function models of all the sampling observation moments by using a least square method so as to obtain seabed beacon motion models of all the seabed beacons; and when the current seabed beacon is observed at the current moment, substituting the current moment into the seabed beacon motion model of the current seabed beacon to obtain a motion three-dimensional coordinate of the current seabed beacon at the current moment. According to the invention, the relative positioning precision of the seabed beacons is improved.

1. Name of the product in this design: Geodetic Antenna. 2. Applications of this design: It is used for high-precision GNSS static observation, urban GNSS-CORS systems, health monitoring of large buildings, roads and bridges, rivers and seas, dams, etc., geodetic and engineering surveying, deformation monitoring and other occasions that require high-precision real-time dynamic monitoring of spatial position. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The present application relates to the technical field of geophysics, and particularly relates to a method for predicting earth rotation parameters based on least squares and long short-term memory network, comprising: collecting and preprocessing basic sequence data of earth rotation and effective angular momentum data; converting the preprocessed basic sequence data of earth rotation into geodetic angular momentum; fitting the effective angular momentum data and the geodetic angular momentum to obtain fitted sequences and residual sequences of the effective angular momentum and the geodetic angular momentum respectively; inputting the residual sequences of the effective angular momentum and the geodetic angular momentum into a long short-term memory network model to obtain error terms of the effective angular momentum and the geodetic angular momentum; and integrating the fitted sequences of the effective angular momentum and the fitted sequences, the error terms of the effective angular momentum and the geodetic angular momentum to obtain a prediction result of the earth rotation parameters. Thus, the problems that the traditional earth rotation parameter prediction method is difficult to capture the complex nonlinear characteristics in the change of the rotation parameters are solved.

This invention relates to the field of gravity inversion technology, specifically a method for joint inversion of groundwater spatiotemporal variations from multi-source geodetic data. The method includes the following steps: Kalman filtering is used to recursively update the nearest neighbor covariance and variance records at the epoch level, simultaneously improving the spatial and temporal stability of groundwater states. This avoids amplifying the impact of single-epoch anomalies on the overall inversion results and maintains the traceability of water thickness change trends during periods of fluctuating observation quality. The Levenburg-Marquardt method is used to iteratively correct the water thickness trajectory within a time window, allowing gravity residuals and deformation residuals to jointly constrain the trajectory adjustment direction in a weighted manner, preventing anomaly adjustments from spreading to adjacent epochs. This gives the fluctuation range after the time series is expanded clear physical meaning. By establishing a hierarchical constraint relationship at the epoch and time window levels, the reliability and interpretability of groundwater changes in long-term assessment and anomaly detection scenarios are improved.

The present application relates to the field of geodetic surveying, and particularly relates to a method for determining altitude based on GNSS frequency signals of Chinese space station. Through obtaining data such as GNSS satellite precise orbit, clock error and earth rotation parameters from IGS analysis center, RINEX format data is obtained by using synchronous observation of space station and ground station receiver, and the gravity potential of space station observation moment is determined in combination with EIGEN-6C4 gravity field model. The frequency observation value is derived from the carrier phase observation value, the observation equation is established in the dual-frequency ionosphere elimination processing mode, the gravity potential difference between space station and ground station is solved, and finally the gravity potential and altitude of ground station are obtained. The present application can replace the traditional leveling and gravity measurement, significantly reduce the cost, overcome the environmental restriction, and support the cross-sea and cross-ocean height transfer and the global height datum unification.

The application discloses an ionosphere total electron content prediction method, a model training method and a system, relates to the field of satellite geodesy and space weather prediction, and the model training method comprises: an ionosphere total electron content prediction model comprising an encoder part of a stacked autoencoder, an Informer network and a decoder part of the stacked autoencoder connected in sequence; wherein the model training comprises stacked autoencoder training and Informer network training. The ionosphere total electron content prediction model is constructed based on the Informer network and the stacked autoencoder, the ionosphere total electron content prediction model is used for ionosphere total electron content prediction, the time complexity is reduced, the memory occupation is reduced, and the ionosphere total electron content prediction efficiency is improved.

The present application relates to geodetic and engineering surveying technical field, specifically to a kind of plane coordinate point cloud fitting arbitrary close degree error ellipse in control network design stage.The method includes: the pre-processing of control point coordinate point cloud, removes abnormal value;Accurate spatial precision evaluation density field is constructed to calculate grid point density value;According to the specified confidence, the density threshold value is calculated, the contour is extracted and the error ellipse parameter is fitted.The present application solves the ellipse fitting problem of any specified confidence of non-normal distribution point cloud by adaptive bandwidth kernel density estimation, and significantly improves the reliability of precision evaluation under complex scene.

The invention provides a sea level fingerprint calculation method and system based on land component mass change, and belongs to the technical field of geodetic survey. Comprising the following steps: reconstructing a quality change time sequence of land components according to obtained quality change data, carrying out gridding processing on land and ocean areas in a data acquisition range, and mapping the quality change data to grids; performing sea level fingerprint initial calculation based on the mass change data in the grid; and finally, performing iterative optimization on the initial sea level fingerprints through parameter updating of the earth rotational inertia to obtain final sea level fingerprint spatial distribution. On the premise of not depending on satellite observation, corresponding gravitational potential and rotation potential can be calculated based on land quality change, and integral calculation is carried out in a global range to obtain accurate sea level fingerprint spatial distribution.

The invention relates to a method for calculating a northbound gradient of a meridian component of a sea plumb line deviation, and provides a method for calculating the northbound gradient of the meridian component of the sea plumb line deviation aiming at the compensation requirement of the meridian component of the plumb line deviation of an inertial navigation system under the constraint of the position error of a sea motion carrier. And based on the completely normalized global gravitational potential coefficient, constructing a sea area plumb line deviation meridian component northbound gradient calculation model, and realizing sea area plumb line deviation meridian component northbound gradient calculation. The invention aims to improve the meridian component compensation capability of the vertical line deviation of the inertial navigation system under the constraint of the position error of the motion carrier and improve the navigation precision of the inertial navigation system.

The invention relates to the technical field of geodetic surveying and engineering surveying, in particular to a method for fitting an ellipse with any adaptation error through plane coordinate point clouds in the design stage of a control network. Comprising the steps of preprocessing control point coordinate point cloud, and removing abnormal values; constructing an accurate spatial precision evaluation density field to calculate a grid point density value; and calculating a density threshold according to a specified confidence coefficient, extracting a contour line contour, and fitting an error ellipse parameter. According to the invention, through adaptive bandwidth kernel density estimation, the ellipse fitting problem of any specified confidence of the non-normal distribution point cloud is solved, and the precision evaluation reliability in a complex scene is significantly improved.

The invention discloses a remote island reference-free control network autonomous construction and transmission method, which belongs to the technical field of geodetic survey and surveying and mapping engineering, and comprises the following steps: receiving sea surface laser ranging, land gravity, mobile platform images and accelerometer data; performing statistics on peak values of the laser ranging histograms to extract local average sea surface elevation; a relative geometric point cloud is generated based on image texture tracking in combination with an accelerometer calculation scale; calculating a vertical line inclination angle by using a difference value between the gravity data and an earth normal gravity field; and correcting a point cloud vertical component by using a difference value between a water line and a sea surface elevation, correcting a plane component by using an inclination angle, and outputting a control point. According to the invention, a mode of fusing sea surface laser ranging, mobile platform images, inertial data and land gravity data is adopted, and a local three-dimensional control network with unified scale, elevation reference and vertical line direction can be autonomously constructed under the condition of no external reference dependence.

A unique system for the implementation of a communications system whereby network communicators such as service providers and service users are accessed based on geodetic datum. Service providers broadcast geodetic based network identification information on a common control channel for reception by local proximity service users. The service user evaluates each received broadcast and determines if a secure paired network connection is required. The encoded data link is negotiated between user / provider for secure data transmission based on current geodetic network identification information. Geodetic information, being temporary in nature, can be propagated in position, time or both to provide dynamically updating network identification for any participant.

This invention relates to the fields of geodesy and radar engineering technology, and discloses a method, apparatus, and electronic equipment for the directional deployment of corner reflectors. The method includes: determining two measurement reference points in the proposed deployment area of ​​the corner reflector and obtaining the geodetic coordinates of the measurement reference points, and then calculating the reference azimuth angle of the baseline between the measurement reference points relative to true north; using the reference azimuth angle as a reference, marking two auxiliary points in the proposed deployment area of ​​the corner reflector and determining the local physical baseline; obtaining the design azimuth angle of the corner reflector and calculating the azimuth angle difference between the design azimuth angle and the reference azimuth angle; and using the local physical baseline as a reference, directionally deploying the corner reflector according to the azimuth angle difference. The method provided by this invention can still stably obtain an absolute physical reference pointing to true north even in extreme electromagnetic environments such as substations and building complexes, realizing high-precision deployment of corner reflectors in areas with strong interference.

1. Name of the design product: Global Navigation Satellite System receiver. 2. Use of the design product: For satellite positioning, especially for precise geodesy or precise engineering surveying, such as for construction positioning, crack monitoring, foundation pit monitoring, house deformation monitoring, slope monitoring, ground subsidence monitoring, and construction surveying of wharfs, dams, bridges, tunnels, or subways. 3. Design points of the design product: In shape. 4. Pictures or photos best indicating the design points: Perspective view.

The present invention belongs to the technical field of space geodesy, and particularly relates to a method for calculating the zenith tropospheric delay in a region. The method first selects GNSS stations that meet the accuracy requirements for calculating the zenith tropospheric delay in the target region according to the corresponding relationship between the calculation accuracy of the zenith tropospheric delay and the shortest distance of the stations; wherein, the corresponding relationship is obtained by performing simulation calculations on the target region; then, according to the observables of the selected GNSS stations, the zenith tropospheric delay values at each GNSS station are calculated; the zenith tropospheric delays at each GNSS station are extended to other reference surfaces, and after the extension, grid processing is performed to obtain the regional delay values on other reference surfaces; finally, the regional delay values on other reference surfaces are inversely extended to the ground surface to obtain the regional zenith tropospheric delay values. The present invention can obtain accurate calculation results of the zenith tropospheric delay in the target region based on a small number of GNSS stations.