CN116299569A - GNSS-based dynamic measurement method and system for elevation control network - Google Patents
GNSS-based dynamic measurement method and system for elevation control network Download PDFInfo
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- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
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- G—PHYSICS
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- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
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Abstract
The invention discloses a dynamic measurement method and a system for an elevation control network based on GNSS, wherein the method comprises the following steps: when the elevation control network is restored, obtaining the constant difference of the heights Cheng Yi of all nodes of the elevation control network relative to the starting point of the stable elevation; performing staged synchronous GNSS observation on the stable elevation starting point and each node to obtain the real-time geodetic height of the Cheng Qisuan stable height point and the real-time geodetic height of each node; and calculating the real-time normal height of each node according to the normal height and the real-time ground height of the stable elevation starting point and the Gao Chengyi common difference and the real-time ground height of each node. The high-precision dynamic measurement of the elevation control network is realized by using the GNSS technology, the defects of station-by-station transmission, more personnel, high cost, low efficiency, long time consumption and the like existing in the maintenance of the elevation control network by using the leveling measurement are overcome, the operation efficiency is improved, the number of personnel is reduced, and the maintenance precision of the elevation control network can reach the precision level equivalent to the level network retesting.
Description
Technical Field
The invention relates to the technical field of measurement, in particular to a dynamic measurement method and system for an elevation control network based on GNSS.
Background
Currently, leveling is the only technical means to build a elevation control network. Although satellite navigation positioning (GNSS) is widely used, there is a trend to replace the conventional geodetic method, but in terms of precise elevation transfer, the present stage is still unable to replace the precise leveling. For many years, our country has made a lot of work in the building, maintenance and application services of elevation control networks. For example: the national surveying and mapping authorities organize and implement several times of large-scale elevation control network retest projects; military and local departments and engineering units perform a number of area-wide elevation-control network measurement tasks throughout the year. The national seismic authorities at all levels monitor the active fracture zone year by year, month by month and even day by using a water level measuring method.
Leveling is one of the most important methods for establishing and maintaining the geodetic reference for a long time, and is the most expensive project in terms of manpower and material resources. Due to the influence of various factors such as crustal movement, urban construction, underground water exploitation, mineral resource development and the like, ground subsidence with different degrees occurs in many areas of China, and in order to provide highly-realistic elevation result data for national economy construction departments and scientific research departments, elevation control networks of all levels must be periodically retested so as to ensure that the results of the elevation control networks can reflect the real conditions of ground elevations.
For general areas, the retest period is 2-5 years, for areas with severe sedimentation, the retest period is typically 0.5-2 years or even shorter. The elevation control network formed by each level network at the present stage must transmit the elevation value from the elevation starting point to each node of the elevation control network in a station-by-station leveling measurement mode. The leveling course length is related to the area size, and in general, the city level area leveling course length is 2000-4000 km, the provincial level area leveling course length is 5000-20000 km, and the nationwide leveling course length is 200000-400000 km. Taking a city level area with a leveling route length of about 2000 km as an example, 10 leveling operation groups with a total number of 60 people are adopted, at least 3 months of time is required for completing all leveling network observation, and the workload and the time consumption for observing the elevation control network in a provincial range and a national range are larger. The repeated measurement of the elevation control network has the advantages of more operators, high economic cost, low operation efficiency and long operation time consumption, and particularly for areas with serious ground subsidence, the repeated measurement period of the elevation control network is generally 1 year or even shorter, and the repeated measurement of the level network is carried out in the long-term month and the long-term month, so that the cost is quite high.
Current elevation control networks rely primarily on leveling techniques to perform the elevation Cheng Chuandi. Leveling, also known as geometric leveling, is a method of measuring the difference in elevation between two points on the ground using a level gauge and a leveling rod. And arranging a level gauge between two points on the ground, observing a leveling staff erected on the two points, and calculating the height difference between the two points according to the reading on the staff. The elevation of each leveling mark point is usually measured by starting from a leveling origin or any known elevation point and erecting a leveling instrument station by station along a selected leveling route for leveling observation. As shown in fig. 1, the leveling network is composed of a plurality of leveling routes, and leveling is performed by erecting leveling gauges station by station from a certain elevation known point, namely, a stable elevation starting point, and elevation values of the known points are transmitted to each leveling point. And each leveling route forms a closed or additional route, leveling network data processing is performed, and the leveling point elevation after adjustment is calculated. In fig. 1, diamond points are stable elevation starting points, and the origin is a node of an elevation control network, that is, a level point. The elevation control network retest is to measure the latest normal height of each leveling point, adopts a leveling measurement mode, needs to measure from the elevation starting point, establishes a level gauge station by station, and transmits the elevation of the elevation starting point to each node, wherein triangles in the figure are all measuring stations on a leveling route.
Disclosure of Invention
The invention aims to provide a dynamic measurement method and a dynamic measurement system for an elevation control network based on GNSS (Global navigation satellite System), which realize high-precision dynamic maintenance of the elevation control network by utilizing the GNSS technology, solve the inherent defects of station-by-station transmission, more operators, high economic cost, low operation efficiency, long operation time consumption and the like in the prior art of maintaining the elevation control network by utilizing leveling measurement, reduce the maintenance cost and the operation time of the elevation control network, improve the operation efficiency, reduce the number of operators, and enable the maintenance precision of the elevation control network to reach the precision level equivalent to the level network retesting.
In order to solve the above technical problems, a first aspect of the embodiments of the present invention provides a dynamic measurement method for a GNSS-based elevation control network, including the following steps:
when the elevation control network is recovered, obtaining the constant difference of the heights Cheng Yi of all nodes of the elevation control network relative to the starting point of the stable elevation;
performing phased synchronous GNSS observation 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 according to the normal height and the real-time ground height of the stable elevation starting point and the Gao Chengyi common difference and the real-time ground height of each node.
Further, the acquiring the height Cheng Yi of each node of the elevation control network relative to the stable elevation starting point is quite poor, including:
performing level net observation on the stable elevation starting points and the nodes to obtain the adjustment of the nodes and then obtaining the normal height of the nodes;
performing full-network GNSS observation on the stable elevation starting point and each node to obtain the ground height of the stable elevation starting point and the ground height of each node;
and obtaining the constant difference of the height Cheng Yi of each node relative to the stable elevation starting point according to the ground height of the stable elevation starting point and the normal height and the ground height after the adjustment of each node.
Further, the performing level network observation on the stable elevation starting point and each node to obtain the adjustment of each node is high, including:
starting from the stable elevation starting point, transmitting the elevation station by adopting a leveling mode to obtain the elevation difference observation value of each water measuring section;
and carrying out leveling net adjustment calculation to obtain the adjustment of each node and then obtaining the normal height.
Further, the performing global GNSS observation on the stable elevation starting point and each node to obtain the geodetic height of the stable elevation starting point and the geodetic height of each node includes:
performing phased synchronous GNSS observation on the stable elevation starting point and each node;
and calculating the geodetic height of the stable elevation starting point and the geodetic height of each node according to the GNSS reference station and the GNSS measurement data of each node.
Accordingly, a second aspect of an embodiment of the present invention provides a GNSS-based elevation control network dynamic measurement system, comprising:
the acquisition module is used for acquiring the constant difference of the heights Cheng Yi of all nodes of the elevation control network relative to the stable elevation starting point when the elevation control network is restored;
the measuring module is used for carrying out staged synchronous GNSS observation 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 the calculation module is used for calculating the real-time normal height of each node according to the normal height and the real-time ground height of the stable elevation starting point and the Gao Chengyi common difference and the real-time ground height of each node.
Further, the acquisition module includes:
the first measurement submodule is used for carrying out level network observation on the stable elevation starting point and each node to obtain the normal height of each node after the adjustment of each node;
the second measurement submodule is used for carrying out full-network GNSS observation on the stable elevation starting point and each node to obtain the ground height of the stable elevation starting point and the ground height of each node;
and the calculation sub-module is used for obtaining the constant difference of the height Cheng Yi of each node relative to the stable elevation starting point according to the ground height of the stable elevation starting point and the normal height and the ground height after the adjustment of each node.
Further, the first measurement submodule includes:
the first measuring unit is used for measuring from the stable elevation starting point, transmitting the elevation station by adopting a leveling mode, and obtaining the elevation difference observation value of each water measuring section;
and the first calculation unit is used for carrying out leveling net adjustment calculation to obtain the normal height of each node after adjustment.
Further, the second measurement submodule includes:
the second measuring unit is used for carrying out staged synchronous GNSS observation on the stable elevation starting point and each node;
and the second calculation unit is used for calculating the geodetic height of the stable elevation starting point and the geodetic height of each node from the GNSS measurement data of the GNSS reference station and each node.
Accordingly, a third aspect of the embodiment of the present invention further provides an electronic device, including: at least one processor; and a memory coupled to the at least one processor; the memory stores instructions executable by the one processor to cause the at least one processor to perform the above-described GNSS-based altitude control network dynamic measurement method.
In addition, a fourth aspect of the embodiments of the present invention provides a computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement the above-mentioned GNSS-based altitude control network dynamic measurement method.
The technical scheme provided by the embodiment of the invention has the following beneficial technical effects:
the high-precision dynamic maintenance of the elevation control network is realized by using the GNSS technology, the inherent defects of station-by-station transmission, more operators, high economic cost, low operation efficiency, long operation time consumption and the like existing in the maintenance of the elevation control network by using the leveling measurement in the prior art are overcome, the maintenance cost and the operation time of the elevation control network are reduced, the operation efficiency is improved, the number of operators is reduced, and the maintenance precision of the elevation control network can reach the precision level equivalent to the level network retest.
Drawings
FIG. 1 is a schematic diagram of a leveling principle in the prior art;
FIG. 2 is a flowchart of a dynamic measurement method for a GNSS-based elevation control network according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a dynamic measurement method of a GNSS-based elevation control network according to an embodiment of the present invention;
FIG. 4 is a schematic illustration of a GNSS-based elevation control network dynamic measurement method in accordance with an embodiment of the present invention;
FIG. 5 is a block diagram of a GNSS-based elevation control network dynamic measurement system provided by an embodiment of the present invention;
FIG. 6 is a schematic diagram of an acquisition module according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a first measurement submodule according to an embodiment of the present invention;
fig. 8 is a schematic diagram of a second measurement submodule according to an embodiment of the present invention.
Reference numerals:
1. the system comprises an acquisition module 11, a first measurement submodule 111, a first measurement unit 112, a first calculation unit 12, a second measurement submodule 121, a second measurement unit 122, a second calculation unit 13, a calculation submodule 2, a measurement module 3 and a calculation module.
Detailed Description
The objects, technical solutions and advantages of the present invention will become more apparent by the following detailed description of the present invention with reference to the accompanying drawings. It should be understood that the description is only illustrative and is not intended to limit the scope of the invention. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the present invention.
FIG. 2 is a flowchart of a dynamic measurement method for a GNSS-based elevation control network according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a dynamic measurement method of a GNSS-based elevation control network according to an embodiment of the present invention.
Referring to fig. 2 and 3, a first aspect of the present invention provides a dynamic measurement method for a GNSS-based elevation control network, which includes the following steps:
and S100, when the elevation control network is restored, obtaining the constant difference of the heights Cheng Yi of all nodes of the elevation control network relative to the stable elevation starting point.
And S200, carrying out staged synchronous GNSS observation on the stable elevation starting point and each node to obtain the real-time geodetic height of the stable height Cheng Qisuan point and the real-time geodetic height of each node.
S300, calculating to obtain the real-time normal height of each node according to the normal height and the real-time ground height of the stable elevation starting point and the Gao Chengyi common difference and the real-time ground height of each node.
Specifically, in step S100, obtaining the constant difference in height Cheng Yi of each node of the elevation control network with respect to the stable elevation starting point includes:
s110, carrying out level net observation on the stable elevation starting point and each node to obtain the normal height of each node after the adjustment.
S120, carrying out full-network GNSS observation on the stable height Cheng Qi grate points and each node to obtain the ground height of the stable height Cheng Qi grate points and the ground height of each node.
S130, obtaining the constant difference of the height Cheng Yi of each node relative to the stable Gao Chengqi grid point according to the ground height of the stable height Cheng Qi grid point and the normal height and the ground height after the adjustment of each node.
Further, in step S110, the leveling network observation is performed on the stable high Cheng Qi grate point and each node to obtain the adjustment of each node, which includes:
and S111, starting from a stable height Cheng Qibi point, transmitting the elevation station by adopting a leveling mode, and obtaining the elevation difference observation value of each water measurement section.
And S112, carrying out level mesh adjustment calculation to obtain the adjustment of each node and then obtaining the normal height.
Further, in step S120, performing full-network GNSS observation on the stable high Cheng Qi grate point and each node to obtain a ground height of the stable high Cheng Qi grate point and a ground height of each node, including:
s121, performing staged synchronous GNSS observation on the stable high Cheng Qi grid points and each node.
S122, calculating the ground height of the stable height Cheng Qi grate point and the ground height of each node from GNSS measurement data of the GNSS reference station and each node.
Fig. 4 is a schematic diagram of a dynamic measurement method of a GNSS-based elevation control network according to an embodiment of the present invention.
Referring to fig. 4, diamond points are stable high Cheng Qi grid points, and the round points are nodes of a height control grid. The elevation control network retest is to measure the real-time normal height of each node, and the real-time normal height of each node can be determined by adopting a GNSS measurement mode and only erecting GNSS instruments at the nodes.
In the technical scheme, the basic principle of dynamically maintaining the elevation control network by using the GNSS technology is as follows:
let the node in the elevation control network be P and the stable Gao Chengqi grate point be Q, then:
h P ＝H P +ζ P (1)
h Q ＝H Q +ζ Q (2)
Δh QP ＝h P -h Q (3)
wherein: h is the ground height, H is the normal height, ζ is the elevation abnormality, Δh is the ground height difference, and the normal height H of the node P at the time t can be obtained by combining the formulas (1) - (3) P The method comprises the following steps:
H P (t)＝H Q +[h P (t)-h Q (t)]-[ζ P (t)-ζ Q (t)] (4)
wherein: h Q The normal height of the grating point Q is a known fixed amount for stabilizing the height Cheng Qi, and does not change with time; h is a P (t)、h Q (t) is the earth height of two points at the time t, and is obtained by simultaneously performing GNSS measurement at the two points; zeta type P (t)、ζ Q (t) respectively two points of elevation abnormality, wherein the change of the difference of the elevation abnormality with time is in millimeter level, and can be ignored, and the difference of the elevation abnormality of the two points is calculated by using the normal height and the earth height observed by the first stage leveling network:
ζ P (t)＝ζ P (t 0 )＝h P (t 0 )-H P (t 0 ) (5)
ζ Q (t)＝ζ Q (t 0 )＝h Q (t 0 )-H Q (t 0 ) (6)
then:
ζ P (t)-ζ Q (t)＝[h P (t 0 )-H P (t 0 )]-[h Q (t 0 )-H Q ] (7)
wherein: t is t 0 The observation time of the first-stage leveling network is; h is a P (t 0 )、h Q (t 0 ) Respectively t 0 The time point P and the ground height of the stable high Cheng Qi grate point Q are obtained by GNSS measurement; h P (t 0 ) At t 0 The normal height of the moment node P is observed by a first period leveling network, H Q To stabilize the normal height of the high Cheng Qi grating point Q.
The normal height H of the node P at the time t can be determined by combining the nodes (4) and (7) P 。
In combination with the above calculation process, the steps of one embodiment of the dynamic measurement method of the elevation control network based on the GNSS are as follows:
1) When the first time of elevation control network observation, the elevation is measured from a stable elevation Cheng Qibi point, the elevation is transferred station by adopting a leveling measurement mode to obtain the elevation difference observation value of each leveling segment, leveling network adjustment calculation is carried out, and the normal elevation after adjustment of each node of the elevation control network is obtained
N is the number of nodes.
2) During the first elevation control network observation, erecting GNSS instruments at each node of the elevation control network, carrying out phased synchronous GNSS observation with Cheng Qi grid points of the stabilized elevation, determining the number of the synchronous observation points according to the number of the GNSS instruments, and carrying out data processing by combining GNSS measurement data of high-precision GNSS reference stations and the nodes to obtain three-dimensional coordinates (latitude, longitude and geodetic altitude) of each node of the stabilized elevation Cheng Qi grid points and the elevation control network, wherein the geodetic altitude is h respectively Q (t 0 ) And
3) According to formula (7), calculating the land height and normal height of each node by using the land height and normal height of the stable height Cheng Qi grate point and the land height and normal height of each nodeDifference ζ between elevation anomalies between elevation grid points P (t 0 )-ζ Q (t 0 )。
4) In the second and subsequent re-measurement of the elevation control network, leveling is not needed, and only staged synchronous GNSS observation is needed at each node of the stabilized elevation Cheng Qi grate point and the elevation control network, and the method is the same as the step 2), so that new three-dimensional coordinates (latitude, longitude and geodetic height) of each node of the stabilized elevation Cheng Qi grate point and the elevation control network are obtained, and the geodetic heights are h respectively Q (t) and
5) According to formula (4), calculating the real-time normal height of each node of the elevation control network by using the normal height and the real-time ground height of the stabilized height Cheng Qi grate point, the real-time ground height of each node and the difference of the elevation abnormality of each node relative to the stabilized Gao Chengqi grate point obtained in the step 3)
For an elevation control network, the number of nodes is hundreds, more than ten thousands, and the dynamic maintenance of the elevation control network by using leveling measurement has the disadvantages of large workload, high cost and long time consumption. If the above GNSS measurement method is adopted to dynamically maintain the normal height of each node, the normal height of each node is obtained by carrying out the first level network observation at the beginning, and meanwhile, the ground height is obtained by carrying out the GNSS measurement on each node, and then, each measurement is carried out without carrying out the level observation, and the real-time normal height of each node of the elevation control network can be obtained by carrying out the GNSS measurement on each node again, thereby realizing the dynamic maintenance of the elevation control network.
For the same-point elevation control network retest, the required observers, operation cost and time consumption of the GNSS measurement mode are greatly lower than those of the leveling measurement mode, so that the elevation control network retest is carried out by adopting the GNSS measurement mode, the maintenance cost and operation time of the elevation control network can be greatly reduced, the operation efficiency is improved, the number of operators is reduced, and the accuracy of the elevation control network retest can reach the accuracy level equivalent to that of the leveling network retest.
According to the GNSS-based dynamic measurement method for the elevation control network, the GNSS measurement method is adopted to dynamically maintain the normal height of each node of the elevation control network, when the elevation control network is compounded, only the stabilized elevation Cheng Qi grid points and each node of the elevation control network are needed to be subjected to staged synchronous GNSS observation, and the real-time ground heights of each node obtained through GNSS measurement are combined with the difference of the elevation abnormality of each node relative to Gao Chengqi grid points, so that the real-time normal height of each node of the elevation control network can be obtained, and the dynamic maintenance of the elevation control network is realized.
The dynamic maintenance of the elevation control network is carried out by using the GNSS technology, besides the first time of leveling network observation, the second and subsequent time of elevation control network retesting does not need leveling measurement, and only the staged synchronous GNSS observation is carried out at the stable elevation starting point and each node of the elevation control network. For the same-point elevation control network retest, the required observers, operation cost and time consumption of the GNSS measurement mode are greatly lower than those of the leveling measurement mode, so that the elevation control network retest is carried out by adopting the GNSS measurement mode, the maintenance cost and operation time of the elevation control network can be greatly reduced, the operation efficiency is improved, the number of operators is reduced, and the accuracy of the elevation control network retest can reach the accuracy level equivalent to that of the leveling network retest.
FIG. 5 is a block diagram of a GNSS-based elevation control network dynamic measurement system according to an embodiment of the present invention.
Accordingly, referring to fig. 5, a second aspect of the present invention provides a GNSS-based elevation control network dynamic measurement system, including: an acquisition module 1, a measurement module 2 and a calculation module 3. The acquisition module 1 is used for acquiring the constant difference of the heights Cheng Yi of all nodes of the elevation control network relative to the stable elevation starting point when the elevation control network is restored; the measuring module 2 is used for carrying out phased synchronous GNSS observation on the stable elevation starting point and each node to obtain the real-time geodetic height of the stable height Cheng Qisuan point and the real-time geodetic height of each node; the calculating module 3 is used for calculating the real-time normal height of each node according to the normal height and the real-time ground height of the stable elevation starting point and the Gao Chengyi common difference and the real-time ground height of each node.
Fig. 6 is a schematic diagram of an acquisition module according to an embodiment of the present invention.
Further, referring to fig. 6, the acquisition module 1 includes: a first measurement submodule 11, a second measurement submodule 12 and a calculation submodule 13. The first measurement submodule 11 is used for carrying out level network observation on the stable elevation starting point and each node to obtain the normal height of each node after the adjustment of each node; the second measurement submodule 12 is used for carrying out full-network GNSS observation on the stable elevation starting point and each node to obtain the earth height of the stable height Cheng Qisuan point and the earth height of each node; the calculation sub-module 13 is used for obtaining the normal height Cheng Yi common difference of each node relative to the stable elevation starting point according to the ground height of the stable elevation starting point and the normal height and the ground height after the adjustment of each node.
Fig. 7 is a schematic diagram of a first measurement submodule according to an embodiment of the present invention.
Further, referring to fig. 7, the first measurement sub-module 11 includes: a first measurement unit 111 and a first calculation unit 112. The first measurement unit 111 is used for measuring from a stable elevation starting point, and transmitting the elevation station by adopting a leveling measurement mode to obtain an elevation difference observation value of each water measurement section; the first calculating unit 112 is configured to perform a leveling adjustment calculation to obtain a normal height of each node after adjustment.
Fig. 8 is a schematic diagram of a second measurement submodule according to an embodiment of the present invention.
Further, referring to fig. 8, the second measurement sub-module 12 includes: a second measurement unit 121 and a second calculation unit 122. The second measurement unit 121 is configured to perform phased synchronous GNSS observation on the stable elevation starting point and each node; the second calculation unit 122 is configured to calculate the geodetic height of the stable altitude Cheng Qisuan point and the geodetic height of each node from the GNSS measurement data of the GNSS reference station and each node.
According to the GNSS-based dynamic measurement system for the elevation control network, high-precision dynamic maintenance of the elevation control network is achieved through the GNSS technology, inherent defects of station-by-station transmission, more operators, high economic cost, low operation efficiency, long operation time consumption and the like existing in the prior art of maintaining the elevation control network by using leveling measurement are overcome, maintenance cost and operation time of the elevation control network are reduced, the operation efficiency is improved, the number of operators is reduced, and the maintenance precision of the elevation control network can reach the precision level equivalent to the level network retest.
Accordingly, a third aspect of the embodiment of the present invention further provides an electronic device, including: at least one processor; and a memory coupled to the at least one processor; the memory stores instructions executable by the one processor to cause the at least one processor to perform the above-described GNSS-based altitude control network dynamic measurement method.
In addition, a fourth aspect of the embodiments of the present invention provides a computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement the above-mentioned GNSS-based altitude control network dynamic measurement method.
The embodiment of the invention aims to protect a dynamic measurement method and a dynamic measurement system of an elevation control network based on GNSS, wherein the method comprises the following steps: when the elevation control network is restored, obtaining the constant difference of the heights Cheng Yi of all nodes of the elevation control network relative to the starting point of the stable elevation; performing staged synchronous GNSS observation on the stable elevation starting point and each node to obtain the real-time geodetic height of the Cheng Qisuan stable height point and the real-time geodetic height of each node; and calculating the real-time normal height of each node according to the normal height and the real-time ground height of the stable elevation starting point and the Gao Chengyi common difference and the real-time ground height of each node. The technical scheme has the following effects:
the high-precision dynamic maintenance of the elevation control network is realized by using the GNSS technology, the inherent defects of station-by-station transmission, more operators, high economic cost, low operation efficiency, long operation time consumption and the like existing in the maintenance of the elevation control network by using the leveling measurement in the prior art are overcome, the maintenance cost and the operation time of the elevation control network are reduced, the operation efficiency is improved, the number of operators is reduced, and the maintenance precision of the elevation control network can reach the precision level equivalent to the level network retest.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. The dynamic measurement method of the elevation control network based on the GNSS is characterized by comprising the following steps:
when the elevation control network is recovered, obtaining the constant difference of the heights Cheng Yi of all nodes of the elevation control network relative to the starting point of the stable elevation;
performing phased synchronous GNSS observation 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 according to the normal height and the real-time ground height of the stable elevation starting point and the Gao Chengyi common difference and the real-time ground height of each node.
2. The method of claim 1, wherein the obtaining the constant difference in the height Cheng Yi of each node of the elevation control network relative to the stable elevation starting point comprises:
performing level net observation on the stable elevation starting points and the nodes to obtain the adjustment of the nodes and then obtaining the normal height of the nodes;
performing full-network GNSS observation on the stable elevation starting point and each node to obtain the ground height of the stable elevation starting point and the ground height of each node;
and obtaining the constant difference of the height Cheng Yi of each node relative to the stable elevation starting point according to the ground height of the stable elevation starting point and the normal height and the ground height after the adjustment of each node.
3. The dynamic measurement method of elevation control network based on GNSS of claim 2, wherein said leveling network observation of said stable elevation starting point and said nodes to obtain said adjustment of each node is normally high, comprising:
starting from the stable elevation starting point, transmitting the elevation station by adopting a leveling mode to obtain the elevation difference observation value of each water measuring section;
and carrying out leveling net adjustment calculation to obtain the adjustment of each node and then obtaining the normal height.
4. The method of claim 2, wherein performing full-network GNSS observations of the stable altitude starting point and the nodes to obtain the geodetic height of the stable altitude starting point and the geodetic height of the nodes comprises:
performing phased synchronous GNSS observation on the stable elevation starting point and each node;
and calculating the geodetic height of the stable elevation starting point and the geodetic height of each node according to the GNSS reference station and the GNSS measurement data of each node.
5. A GNSS-based elevation control network dynamic measurement system, comprising:
the acquisition module is used for acquiring the constant difference of the heights Cheng Yi of all nodes of the elevation control network relative to the stable elevation starting point when the elevation control network is restored;
the measuring module is used for carrying out staged synchronous GNSS observation 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 the calculation module is used for calculating the real-time normal height of each node according to the normal height and the real-time ground height of the stable elevation starting point and the Gao Chengyi common difference and the real-time ground height of each node.
6. The GNSS based elevation control network dynamic measurement system of claim 5, wherein the acquisition module comprises:
the first measurement submodule is used for carrying out level network observation on the stable elevation starting point and each node to obtain the normal height of each node after the adjustment of each node;
the second measurement submodule is used for carrying out full-network GNSS observation on the stable elevation starting point and each node to obtain the ground height of the stable elevation starting point and the ground height of each node;
and the calculation sub-module is used for obtaining the constant difference of the height Cheng Yi of each node relative to the stable elevation starting point according to the ground height of the stable elevation starting point and the normal height and the ground height after the adjustment of each node.
7. The GNSS based elevation control network dynamic measurement system of claim 6, wherein the first measurement submodule comprises:
the first measuring unit is used for measuring from the stable elevation starting point, transmitting the elevation station by adopting a leveling mode, and obtaining the elevation difference observation value of each water measuring section;
and the first calculation unit is used for carrying out leveling net adjustment calculation to obtain the normal height of each node after adjustment.
8. The GNSS based elevation control network dynamic measurement system of claim 6, wherein the second measurement submodule comprises:
the second measuring unit is used for carrying out staged synchronous GNSS observation on the stable elevation starting point and each node;
and the second calculation unit is used for calculating the geodetic height of the stable elevation starting point and the geodetic height of each node from the GNSS measurement data of the GNSS reference station and each node.
9. An electronic device, comprising: at least one processor; and a memory coupled to the at least one processor; wherein the memory stores instructions executable by the one processor to cause the at least one processor to perform the GNSS based altitude control network dynamic measurement method of any of claims 1-4.
10. A computer readable storage medium having stored thereon computer instructions which when executed by a processor implement the GNSS based altitude control network dynamic measurement method of any of claims 1-4.
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