9 results about "Correction number" patented technology

This invention relates to a method and system for broadcasting PPP-RTK corrections. The method includes acquiring grid point information; determining correction information according to a dynamic partitioning method based on the satellite's orbital direction, satellite signal coverage area, and the grid point information; the correction information includes a header file, the grid point information, tropospheric corrections, and oblique ionospheric corrections; and uploading the correction information to an uplink station to control satellite broadcasting of the correction information. This invention solves the problems of satellite bandwidth allocation, correction area division, and correction data format encoding for PPP-RTK atmospheric delay corrections broadcast in low-Earth orbit satellite broadcasting areas.

The invention discloses a stability evaluation method and system for a PPP-B2b clock error constant deviation, and the method comprises the steps: obtaining a correction number of a Beidou PPP-B2b service, and carrying out the preprocessing of the correction number; according to the preprocessed correction number, through a clock error constant deviation single-station extraction model, calculating observed time sequence data of clock error constant deviation of each satellite; judging the continuity of the time sequence data of the clock error constant deviation of each satellite, dividing the discontinuous time sequence data into a plurality of sub-arc segments, and calculating the stability evaluation value of each sub-arc segment to obtain a stability evaluation sequence of the time sequence data; and performing stability evaluation on the stability evaluation sequence to obtain a comprehensive stability evaluation value, and evaluating the stability according to the comprehensive stability evaluation value. According to the method, the continuous arc segments are identified and segmented firstly, and then independent statistics is carried out on the interior of each arc segment, so that the interference of systematic step between the arc segments on stability statistics is fundamentally stripped, and the authenticity and accuracy of clock error constant deviation stability evaluation are improved.

A data processing method, device, equipment, storage medium and program product, relating to the satellite positioning technology field. The method comprises: receiving the SSR correction number product broadcast by the PPP-RTK server; decoding the SSR correction number product; correcting the satellite position and satellite clock obtained from the broadcast ephemeris by using the decoded data; generating an atmospheric correction product by using the decoded data and the user local sketchy position; generating virtual observations by using the user starting position, the corrected satellite position and satellite clock, and the atmospheric correction product; and performing RTK calculation by using the virtual observations. The method makes the RTK algorithm not need to consider the ambiguity parameter update problem caused by the base station coordinate switching, and also does not cause the atmospheric correction product precision decay due to the baseline distance lengthening, thereby ensuring the atmospheric correction product precision and improving the user end fixing rate and stability.

The invention discloses a data broadcasting method, electronic equipment, a storage medium and a computer program product, and the method comprises the steps: filtering invalid data and / or data which does not affect the data precision from first data, and obtaining second data; broadcasting the second data or third data through a satellite link and / or a wireless network, wherein the third data is obtained by compressing the second data; the first data represents the SSR correction number needing to be broadcasted to the terminal or the received SSR correction number sent by the base station.

The application discloses a positioning method, system, device, medium and product, and belongs to the technical field of satellite navigation and positioning. The method comprises the following steps: determining an initial base station set according to first position data of all first base stations and second position data of a user; calculating actual errors according to real-time observation data of each second base station in the initial base station set, obtaining an initial interpolation model, and then obtaining an initial internal coincidence precision and an initial correction number; if the initial internal coincidence precision is less than a first preset threshold, iteratively adding a third base station to the initial base station set to obtain a current model, stopping iteration until a first stop condition or a second stop condition is met, and determining a target model according to a stop type; calculating a target correction number according to the target model, correcting initial observation data through the target correction number, and obtaining a user positioning result. Therefore, the model precision and reliability can be improved, and high-precision positioning in a full time period can be realized by implementing the application.

The application discloses a GNSS and leveling fusion ground deformation monitoring method and system with dynamic optimization weight, and relates to the technical field of geodesy and deformation monitoring.The method comprises the following steps: analyzing leveling and GNSS rate observation data; setting the elevation correction number and subsidence rate parameter of a monitoring point as unknown parameters, constructing adjustment observation equations coupled with observation time and subsidence rate parameters, forming a design matrix, an observation vector and an initial weight matrix; performing dynamic weight optimization, introducing a global weight factor for adaptive scanning, and on the basis of the optimal global weight ratio, calculating a weight reduction factor by using robust estimation according to the standardized residual error of GNSS observation values, and obtaining the optimal weight matrix; and finally solving the optimal estimation value of unknown parameters based on the optimal weight matrix.The application realizes two-stage dynamic optimization of the weight, objectively optimizes the weight by data driving, effectively suppresses the influence of gross errors, and significantly improves the precision and reliability of multi-source data fusion deformation monitoring.

The invention discloses a regional real-time high-credibility satellite orbit and clock error correction product generation method, and the method comprises the steps: carrying out the real-time abnormal monitoring of a broadcast ephemeris, and carrying out the fusion of a real-time high-precision satellite orbit issued by a plurality of mechanisms and a clock error correction to generate a real-time reference, so as to carry out the credibility evaluation of the correction. And finally, the track and the clock error credibility are broadcasted to the user respectively by coding the regional product. According to the method, the problems existing in the real-time high-precision satellite orbit and clock error data credibility calculation process are solved.

Provided are a short message-based fixed ambiguity precise point positioning method, device and medium, and a method, device and medium for providing the same. The method comprises: obtaining, by a user terminal, initial coordinates of a station, selecting a system frequency band, and sending to the system via short message communication; converting, by the system terminal, the SSR orbit clock correction number of a satellite into an OSR comprehensive correction number in the line-of-sight direction of the station-satellite; performing polynomial coefficient fitting on the OSR comprehensive correction number in a predetermined time period by the system terminal to obtain polynomial coefficients, estimating phase fraction offset products of the frequency points, encoding them, and sending them to the user terminal via short message communication; broadcasting, by the system terminal, the OSR comprehensive correction number of the latest epoch to the user terminal via short message communication; extrapolating, by the user terminal, the OSR comprehensive correction number via the polynomial coefficients to obtain the extrapolated current epoch OSR comprehensive correction number, and combining the phase fraction offset products to achieve fixed ambiguity precise point positioning.