12 results about "Levelling" patented technology

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 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 invention belongs to the technical field of geophysics and surveying and mapping science, and discloses an earthquake and level settlement association method and system based on spatial overlay analysis, and the method comprises the following steps: S1, obtaining level measurement data and earthquake directory data; s2, constructing a level line buffer area according to the leveling data; s3, processing the leveling data to obtain level settlement data, and generating a level settlement change point layer according to the level settlement data; s4, performing spatial interpolation according to the level settlement change point diagram layer and the level line buffer area to obtain a settlement change thermodynamic diagram; s5, generating a hierarchical symbolization seismic map layer according to the seismic directory data; s6, the settlement change thermodynamic diagram and the hierarchical symbolization seismic map layer are displayed in an overlapped mode, and an earthquake and level settlement correlation analysis result is obtained. The method disclosed by the invention intuitively reveals and evaluates the spatial correlation between the vertical deformation field and the seismic activity, and provides a brand new technical tool for the conjoint analysis of the earthquake and the level settlement.

The invention discloses an urban land subsidence monitoring method integrating Beidou satellite navigation and leveling, which is characterized by comprising the following steps of: 1) performing high-precision positioning calculation on a Beidou base station and peripheral IGS stations to obtain a geodetic height single-day solution and a median error of the Beidou base station under an ITRF (International Telecommunication Radio Frequency) framework; 2) calculating the settlement amount and the median error of the Beidou base station during the two-stage leveling observation; and 3) obtaining two-stage leveling measurement data and carrying out fusion analysis on the settlement amount of the Beidou base station in the same stage, and calculating the settlement amount of all the leveling monitoring points. According to the method, a city continuous operation reference station network is fully utilized, a plurality of Beidou base stations are selected according to a certain principle to be incorporated into a level monitoring network, firstly, the settlement amount of the Beidou base station level field observation in the same period is calculated through a filtering method, and the settlement amount is further fused with two-period level measurement data; the influence of long-distance leveling observation accumulated errors is effectively controlled, and the problem of non-uniform leveling observation precision is obviously improved.

The invention provides a leveling method and system and a storage medium. In the method, accurate recording of the geographic position of the observation station is realized by means of a second electronic device capable of obtaining longitude data and dimension data of the observation station, and the geographic position of the observation station is accurately recorded according to observation station number data, geodetic height data, sight distance data, scale reading data, observation time data and height difference data of the observation station. The leveling data record sheet is generated according to the geographic position, the longitude data and the dimension data, and the association of the leveling data and the geographic position is realized, so that the overall precision and the data processing efficiency of an elevation control network constructed according to the leveling data subsequently are improved.

The application provides an intelligent leveling system based on three GNSS coordinate cooperation and a measuring method thereof. The system comprises an intelligent level gauge, a first intelligent leveling rod and a second intelligent leveling rod. All of them are provided with independent GNSS modules and can obtain three-dimensional coordinates in real time. The level gauge can obtain the front and rear sight distances through coordinate inversion and calculate the sight distance difference, and then send the sight distance difference to the display screens of the two rods to guide the first rod to be in place. The leveling rod is provided with an inclination sensor, which can automatically switch among the three states of movement guidance, rod monitoring and righting recording according to the inclination angle, and automatically record the three-dimensional coordinates to form an electronic notebook at the righting moment. The leveling rod can be switched to an RTK mobile station through one key, which is used for layout and recovery of buried leveling points and accurate recovery of temporary leveling points the next day. When the leveling rod is righted for the first time after station migration, the coordinates are automatically compared to realize the detection and tracing of the centimeter-level error. The system can synchronously collect the geodetic height and normal height of each rod point, automatically calculate the height anomaly value and cumulatively form a local height anomaly model.

The invention relates to a sea-crossing bridge settlement deformation observation system based on multi-modal fusion, and the system comprises a Beidou / GNSS monitoring subsystem which is used for constructing a whole-line settlement deformation monitoring control network, takes the geodetic height variable quantity as a settlement value, and comprises a reference network formed by monitoring reference points, a monitoring network formed by working base points and monitoring points, and a monitoring network formed by the working base points and the monitoring points; the reference network and the monitoring network form a monitoring control network; the inclination measurement subsystem comprises an inclination angle sensor which is arranged on an approach bridge pier of the sea-crossing bridge and is used for measuring a non-uniform settlement value of the approach bridge pier; the static leveling subsystem comprises static leveling gauges mounted on a main tower pier and a side pier of the sea-crossing bridge and is used for measuring a relative settlement value of the main tower pier and the side pier and a non-uniform settlement value of the main tower pier; and the data processing subsystem is respectively connected with each subsystem and is used for receiving, storing and calculating data. According to the method, multiple technologies are fused, multi-modal data are formed, and full-period multi-dimensional settlement deformation observation of ultra-wide water area bridge construction is achieved.

The present invention belongs to the field of surveying and mapping technology applications, and particularly relates to a method and application for inverse calculation of instrument height in precision trigonometric height measurement. By finding a suitable reference point, the elevation difference between the leveling point to be measured and the reference point is measured respectively. Then, through the total station combined leveling method, the instrument height of the total station is calculated by the leveling height difference between the two points. This inverse calculation method is applied to the leveling work of large hydropower stations. In the precision second-class cross-river leveling, the instrument height can be controlled to an accuracy of 0.1mm. This overcomes the technical defects of the existing technology that cannot perform second-class cross-river leveling and that the workload is huge when implementing traditional cross-river leveling, and the difficulty in improving the working efficiency, and the reduced leveling accuracy due to the long leveling route.

The invention discloses a method for applying GPS static measurement result conversion parameters to RTK measurement, and belongs to the technical field of engineering measurement. The method comprises the following steps: S1, carrying out synchronous static observation on a CPII control network in a measurement area by adopting a plurality of double-frequency GPS receivers, constructing a network in an edge-connected manner, calculating a baseline vector grid-connected adjustment, and obtaining a three-dimensional coordinate of a control point WGS-84; s2, the digital level gauge carries out fourth level measurement, height difference is rechecked and adjusted, and normal height is obtained; s3, performing segmented area measurement, solving plane conversion parameters based on WGS-84 coordinates and engineering coordinates, and solving elevation conversion parameters by combining geodetic height and normal height; s4, calculating an inspection plane residual error and an elevation residual error; and S5, importing the parameters into RTK equipment, erecting the base station at any control point, and performing real-time dynamic measurement by the moving station. According to the method for applying the GPS static measurement result conversion parameters to RTK measurement, the base station can be flexibly erected, site point correction is not needed, and efficiency and precision are improved.

The utility model relates to the technical field of engineering surveying, in particular to a leveling auxiliary device which comprises a bottom plate, a connecting column, a supporting body, a fixing assembly, a distance measuring plate and a holder base, the bottom plate is used for being fixedly connected with the top of a measuring tripod, the bottom of the connecting column is fixedly connected with the top of the bottom plate, and the supporting body is arranged at the top of the connecting column. The fixing assemblies are symmetrically arranged on the two sides of the supporting body with the axis of the supporting body as the axis, the two distance measuring plates are connected with the two fixing assemblies in a clamped mode respectively, and the holder base is arranged at the top of the supporting body. According to the leveling auxiliary device, through the characteristics of automatic level adjustment, real-time sight distance display and reminding, multifunctional integration, portability and the like, a more accurate, efficient and convenient solution is provided for leveling in the fields of engineering construction, topographic surveying and mapping and the like.

This invention discloses a GNSS-based dynamic measurement method and system for elevation control networks. The method includes: during elevation control network resurvey, acquiring the geoid differences of each node of the elevation control network relative to the stable elevation starting point; performing phased synchronous GNSS observations on the stable elevation starting point and each node to obtain the real-time geodetic height of the stable elevation starting point and the real-time geodetic height of each node; and calculating the real-time normal height of each node based on the normal height and real-time geodetic height of the stable elevation starting point, the geoid differences, and the real-time geodetic height of each node. By utilizing GNSS technology to achieve high-precision dynamic measurement of the elevation control network, this invention solves the shortcomings of using leveling surveys for maintaining elevation control networks, such as station-by-station transmission, large number of personnel, high cost, low efficiency, and long time consumption. It improves operational efficiency, reduces the number of personnel, and enables the maintenance accuracy of the elevation control network to reach the same level as leveling network resurveys.