Water level and surface deformation monitoring method for hydraulic engineering based on Beidou GNSS (Global Navigation Satellite System)

Abstract

The invention discloses a monitoring method for water level and surface deformation of a water conservancy project based on a Beidou GNSS. The monitoring method comprises the following steps: S1, constructing a base station; s2, monitoring point presetting; s3, data acquisition; s4, water level deformation calculation; and S5, warning and reminding. According to the invention, based on Beidou GNSS satellite data, all-weather, full-automatic, real-time and high-precision centimeter-level measurement of the river and lake water surface height is realized; a Beidou water level and displacement high-precision deformation monitoring model is generated in a software and hardware combination mode, and millimeter-level positioning precision is achieved.

Description

Technical Field

[0001] The invention relates to a method for monitoring water level and surface deformation of a water conservancy project based on Beidou GNSS. Background Art

[0002] The existing method of measuring river and lake water levels is mainly through manual inspections, which have low efficiency and poor accuracy and cannot meet the safety requirements of modern water conservancy projects.

[0003] Due to the complex monitoring environment of water conservancy projects and the large differences between base stations and monitoring stations, the commonly used Beidou relative positioning algorithm has a low ambiguity fixation success rate and poor solution accuracy. Summary of the invention

[0004] The main technical problem solved by the present invention is to provide a monitoring method for the water level and surface deformation of water conservancy projects based on Beidou GNSS. Based on Beidou GNSS satellite data, it realizes all-weather, fully automatic, real-time, and high-precision centimeter-level measurement of the water surface height of rivers and lakes; and generates a Beidou water level and displacement high-precision deformation monitoring model by combining software and hardware to achieve millimeter-level positioning accuracy.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a method for monitoring water level and surface deformation of a water conservancy project based on Beidou GNSS, comprising: S1 base station construction, setting up a reference station in a stable area to provide standard differential calibration data; S2 monitoring point preset, GNSS receivers are placed on the water surface, bank, dam, dike or slope of the water conservancy project to form a monitoring network and provide three-dimensional coordinate observation values ​​through Beidou GNSS real-time multi-system and multi-frequency; S3 data collection, transmitting observations to the data center for recording via wireless or limited means; S4 water level deformation calculation, by selecting the optimal frequency combination to automatically invert the observed values, and using the global optimal filtering algorithm to achieve centimeter-level real-time water level inversion, and by analyzing the observed values, extracting the Beidou GNSS deformation time series of water level deformation, establishing an ambiguity resolution method with constraints and a tropospheric residual correction model, correcting the residuals of the double-difference tropospheric model, and obtaining a high-precision deformation monitoring model for water level and displacement; S5 warning reminder, providing an early warning mechanism that is triggered when the water level reaches a preset threshold or the deformation exceeds a safety threshold.

[0006] In a preferred embodiment of the present invention, the GNSS receiver adopts Beidou's surface displacement deformation monitoring and GNSS-R-based water level monitoring integrated equipment.

[0007] In a preferred embodiment of the present invention, the GNSS receiver uses a front-end solution to reduce data transmission pressure, and is configured to enable the solution strategy to be modified on a web page.

[0008] In a preferred embodiment of the present invention, the Beidou GNSS deformation time series is a set of changes in the three-dimensional positions of measurement points arranged in time sequence in a specified coordinate system relative to a specified coordinate reference value.

[0009] In a preferred embodiment of the present invention, the Beidou GNSS deformation time series includes linear terms, nonlinear terms and steps.

[0010] The beneficial effects of the present invention are as follows: the method for monitoring the water level and surface deformation of a water conservancy project based on Beidou GNSS pointed out in the present invention realizes all-weather, fully automatic, real-time, and high-precision centimeter-level measurement of the water surface height of rivers and lakes based on Beidou GNSS satellite data; a Beidou water level and displacement high-precision deformation monitoring model is generated by combining software and hardware to achieve millimeter-level positioning accuracy. DETAILED DESCRIPTION

[0011] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0012] Embodiments of the present invention include: A method for monitoring water level and surface deformation of water conservancy projects based on Beidou GNSS includes: S1 base station construction; S2 monitoring point preset; S3 data collection; S4 water level deformation calculation; S5 warning reminder.

[0013] Using Beidou GNSS satellite data, we study the water level measurement method, surface deformation monitoring and hardware design of water conservancy projects.

[0014] Among them, the S1 base station construction sets up a reference station in a stable area to provide standard differential calibration data and improve monitoring accuracy.

[0015] S2 monitoring points are preset, and GNSS receivers are placed on the water surface, bank, dam, levee or slope of the water conservancy project to form a monitoring network and provide three-dimensional coordinate observation values ​​through Beidou GNSS real-time multi-system and multi-frequency; the GNSS receiver uses Beidou's surface displacement deformation monitoring and GNSS-R-based water level monitoring integrated equipment to achieve millimeter-level deformation monitoring and centimeter-level water level monitoring through a combination of software and hardware. The GNSS receiver uses front-end solution to reduce data transmission pressure, and is set to modify the solution strategy on the web page to better meet the detection needs of water conservancy projects.

[0016] S3 data collection transmits the observation values ​​to the data center for recording wirelessly or in a limited manner, uploads the records in real time at fixed intervals, and converts them into line graphs for easy viewing.

[0017] S4 water level deformation calculation, by selecting the optimal frequency combination to automatically invert the observed values, and using the global optimal filtering algorithm to achieve centimeter-level real-time water level inversion.

[0018] At the same time, by analyzing the observation values, the Beidou GNSS deformation time series of water level deformation is extracted, and an ambiguity resolution method with constraints and a tropospheric residual correction model are established to correct the residuals of the double-difference tropospheric model, improve the success rate of ambiguity fixation, improve the accuracy of deformation monitoring of water conservancy projects in complex environments, and obtain a high-precision deformation monitoring model for water level and displacement.

[0019] Beidou GNSS deformation time series is a set of changes in the three-dimensional position of a set of measurement points arranged in time order in a specified coordinate system relative to a specified coordinate reference value. Beidou GNSS deformation time series includes linear terms, nonlinear terms and steps; accurately separating linear and nonlinear signals and noise in Beidou GNSS deformation time series is the basis for deformation mechanism analysis and a necessary prerequisite for analyzing and evaluating the safety status of engineering bodies. Constructing a more sophisticated Beidou GNSS deformation time series nonlinear signal analysis model can accurately separate false signals, thermal expansion signals, etc. in Beidou GNSS deformation time series, thereby obtaining more realistic long-term change characteristics of water conservancy projects and providing a reference for the evaluation of their safety status.

[0020] S5 warning reminder, providing an early warning mechanism that triggers when the water level reaches a preset threshold or the deformation exceeds a safe threshold. It can communicate remotely through warning lights or mobile devices to respond as quickly as possible.

[0021] To sum up, the method for monitoring water level and surface deformation of water conservancy projects based on Beidou GNSS pointed out in the present invention realizes all-weather, fully automatic, real-time, and high-precision centimeter-level measurement of river and lake water surface height based on Beidou GNSS satellite data; and generates a Beidou water level and displacement high-precision deformation monitoring model by combining software and hardware to achieve millimeter-level positioning accuracy.

[0022] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for monitoring water level and surface deformation of a hydraulic project based on Beidou GNSS, characterized in that: include: S1 base station construction, setting up a reference station in a stable area to provide standard differential calibration data; S2 monitoring point preset, GNSS receivers are placed on the water surface, bank, dam, dike or slope of the water conservancy project to form a monitoring network and provide three-dimensional coordinate observation values ​​through Beidou GNSS real-time multi-system and multi-frequency; S3 data collection, transmitting observations to the data center for recording via wireless or limited means; S4 water level deformation calculation, by selecting the optimal frequency combination to automatically invert the observed values, and using the global optimal filtering algorithm to achieve centimeter-level real-time water level inversion, and by analyzing the observed values, extracting the Beidou GNSS deformation time series of water level deformation, establishing an ambiguity resolution method with constraints and a tropospheric residual correction model, correcting the residuals of the double-difference tropospheric model, and obtaining a high-precision deformation monitoring model for water level and displacement; S5 warning reminder, providing an early warning mechanism that is triggered when the water level reaches a preset threshold or the deformation exceeds a safety threshold.

2. The method for monitoring water level and surface deformation of a hydraulic project based on Beidou GNSS according to claim 1 is characterized in that: The GNSS receiver adopts Beidou's surface displacement deformation monitoring and GNSS-R-based water level monitoring integrated equipment.

3. The method for monitoring water level and surface deformation of a hydraulic project based on Beidou GNSS according to claim 1 is characterized in that: The GNSS receiver uses front-end solution to reduce data transmission pressure, and the solution strategy can be modified on the web page.

4. The method for monitoring water level and surface deformation of a hydraulic project based on Beidou GNSS according to claim 1, characterized in that: The Beidou GNSS deformation time series is a set of changes in the three-dimensional positions of measurement points arranged in time order in a specified coordinate system relative to a specified coordinate reference value.

5. The method for monitoring water level and surface deformation of a hydraulic project based on Beidou GNSS according to claim 1, characterized in that: The Beidou GNSS deformation time series includes linear terms, nonlinear terms and steps.