CN117055083B - Normal high-security service method, system and data broadcasting server - Google Patents
Normal high-security service method, system and data broadcasting server Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/42—Determining position
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- 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
- G01S19/13—Receivers
- G01S19/35—Constructional details or hardware or software details of the signal processing chain
- G01S19/37—Hardware or software details of the signal processing chain
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
- G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
- G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
- G01S19/40—Correcting position, velocity or attitude
- G01S19/41—Differential correction, e.g. DGPS [differential GPS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/02—Services making use of location information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Computer Networks & Wireless Communication (AREA)
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- Signal Processing (AREA)
- Astronomy & Astrophysics (AREA)
- Position Fixing By Use Of Radio Waves (AREA)
- Storage Device Security (AREA)
Abstract
A normal high security service method includes obtaining a service range of a CORS system, establishing a grid, and obtaining a grid point coordinate set; correcting the coordinate elevation of the grid point coordinate set by using a quasi-geodetic level model to obtain a target coordinate system set; converting the coordinate set to obtain a space rectangular coordinate system; calculating seven parameters and seven parameter fitting residual errors, and adjusting a preset central meridian until the seven parameter fitting residual errors are smaller than a set threshold value; fitting the seven-parameter fitting residual errors smaller than a set threshold value into a residual error grid, and jointly forming a loose geoid model by the residual error grid and the seven parameters; and using the desilted geoid model for positioning service. The secret independent geoid refinement model is decomposed into a parameter model and a residual error grid, and the purpose of decryption is achieved by parameterization of the model, so that the safety performance is improved. And the user can acquire high-precision normal high results in real time by using the method.
Description
Technical Field
The application relates to the field of network RTK service, in particular to a normal high-security service method, a system and a data broadcasting server.
Background
In the field of network RTK services, the distance of a ground point along a plumb line to a ground level is referred to as normal elevation, and an elevation system defined by a ground level is referred to as normal elevation system. The elevation used in engineering construction is in a normal elevation system, elevation information in the area is converted by establishing a quasi-geoid model in each place, and the geoid is converted into normal elevation, but the elevation abnormal result (quasi-geoid model) with the required precision being better than +/-1 meter according to the rule of secret scope of mapping geographic information management working country belongs to confidential data, so that the model cannot be applied in real-time network RTK, and only the measurement result can be transmitted to relevant mapping management department for conversion after measurement to obtain applicable result, thereby greatly reducing mapping efficiency, failing to exert the system design requirement of real-time high-precision positioning of urban CORS system, and affecting user experience.
In the related art, zeng Xiangjiang, chen Chunhua, zhou Fengsong. In CORS real-time normal high service method research [ J ]. Global positioning System, 2022,47 (03): 104-108+113. A CORS real-time normal high service method of grid-mesh VRS is proposed.
However, the method still needs to put the ground-like level result on a non-secret-related server which interacts with the user, has a great data security problem, cannot be applied to actual production services, and meanwhile, in the method, the normal high-speed VRS service based on the grid is to change the normal high-speed correction value with a larger value to the VRS station coordinate, and the mode can cause serious reduction of the positioning precision and the fixing rate of the user.
Disclosure of Invention
The application provides a normal high-security service method, a system and a data broadcasting server, which can solve the technical problem of serious decline of user positioning precision and fixed rate in the prior art.
In a first aspect, an embodiment of the present application provides a normal high security service method, where the method includes:
acquiring a service range of a CORS system, establishing a grid according to a set resolution, and acquiring grid point sittingLabel set；
Using a geodetic model for the grid point coordinate setCorrecting the coordinate elevation of the target coordinate system set +.>；
Integrating the grid point coordinatesAnd the set of destination coordinate systems +.>Converting to obtain the coordinate set of the original space rectangular coordinate system +.>Coordinate set of rectangular coordinate system of space with target +.>；
Calculating an original space rectangular coordinate system setRectangular coordinate system set of medium coordinates and target spaceSeven parameters and seven parameter fitting residual errors among the middle coordinates, and adjusting a preset central meridian until the seven parameter fitting residual errors are smaller than a set threshold value;
fitting the seven-parameter fitting residual errors smaller than a set threshold value into a residual error grid, and jointly forming a loose geoid model by the residual error grid and the seven parameters;
and using the desilted geoid model for positioning service.
With reference to the first aspect, in an implementation manner, the acquiring a CORS system serviceEstablishing a grid according to the set resolution and acquiring a grid point coordinate setComprising:
acquiring a service range of a CORS system, and establishing a buffer zone outside the service range of the CORS system;
establishing a grid according to a set resolution in the service range of the CORS system and the buffer area;
acquiring the coordinates of grid points to form the grid point coordinate set。
With reference to the first aspect, in one embodiment, the set of grid point coordinates is mapped using a geodetic modelCorrecting the coordinate elevation of the target coordinate system set +.>Comprising:
obtaining a geoid model of a grid rangeAnd grid Point coordinate set->Longitude and latitude of each coordinate in (a)>；
According to the longitude and latitudeFrom the geoid model +.>Mid-query elevation outliersdH；
Abnormal value of the elevationdHSet of coordinate systems with destinationBond formation->Obtaining the target coordinate system set->。
With reference to the first aspect, in an implementation manner, the grid point coordinate setAnd the set of destination coordinate systems +.>Converting to obtain the coordinate set of the original space rectangular coordinate system +.>Coordinate set of rectangular coordinate system of space with target +.>Comprising:
separately computing dot coordinate sets using a first algorithmAnd the set of destination coordinate systems +.>The values of the space coordinates x, y and z of each coordinate point of the (a);
according to the dot coordinate setAnd the set of destination coordinate systems +.>The space coordinate x, y and z values of each coordinate point of the (B) are obtained to obtain the original space rectangular coordinate system coordinate set +.>Rectangular coordinate system with target spaceCoordinate set；
The first algorithm comprises:
calculating the radius of the earth's mortise and tenon circleNAnd a first eccentricitye:
；
；
Wherein a is the equatorial radius of the reference ellipsoid and b is the polar radius of the reference ellipsoid
Calculating the space coordinates x, y and z of the coordinate points:
；
；
。
with reference to the first aspect, in one implementation manner, the computing the original set of spatial rectangular coordinate systemsRectangular coordinate system set of middle coordinate and target space>Seven parameters and seven parameter fitting residuals between the middle coordinates, adjusting a preset central meridian to the seven parameter fitting residuals being smaller than a set threshold, including:
calculating an original space rectangular coordinate system setRectangular seat with middle coordinates and target spaceLabel tie setSeven parameters among the middle coordinates and seven parameter fitting residual errors;
if the seven-parameter fitting residual is larger than the set threshold, adjusting a preset central meridian, and recalculating a target coordinate system setOriginal space rectangular coordinate set>Coordinate set of rectangular coordinate system of space with targetAnd further, calculating seven parameters and seven parameter fitting residuals again until the seven parameter fitting residuals are smaller than a set threshold.
In a second aspect, an embodiment of the present application provides a data broadcasting server, configured to perform positioning service using the loose geoid model obtained by the method in any one of the first aspects, where the loose geoid model is pre-stored in the data broadcasting server, and the loose geoid model is not generated on the data broadcasting server.
In a third aspect, an embodiment of the present application provides a normal high security service system, including a user side and a data broadcasting server, where the user side is configured to send a differential data request to the data broadcasting server;
the data broadcasting server is used for responding to the differential data request, and performing positioning service by using the loose geoid model obtained by the method in any one of the first aspects, wherein the loose geoid model is pre-stored in the data broadcasting server, and the loose geoid model is not generated on the data broadcasting server.
With reference to the third aspect, in one implementation manner, the data broadcasting server is further configured to:
based on a differential data request from a user side, obtaining user position information, determining seven-parameter fitting residual errors of corresponding positions in the decrypted geoid model based on the position information, adding the seven-parameter fitting residual errors into VRS coordinates of a grid where a user is located, and generating virtual differential data.
With reference to the third aspect, in one implementation manner, the data broadcasting server is further configured to:
and encoding the virtual differential data and the seven parameters into 1021 and 1025 telegrams through RTCM encoding, and then transmitting the telegrams to a user side.
With reference to the third aspect, in an implementation manner, the user side is configured to receive the virtual differential data and the seven parameters after RTCM encoding, and perform differential positioning with satellite observation data after decoding, so as to obtain a positioning result.
The beneficial effects that technical scheme that this application embodiment provided include:
the secret independent geoid refinement model is decomposed into the seven-parameter model and the residual grid by a method of converting the geoid model into seven-parameter fitting and residual grid correction, and parameterization of the model is performed, so that the purpose of decryption is achieved, and the safety performance is improved.
And, in the Virtual Reference Station (VRS) generating broadcasting part, the grid VRS data corresponding to the parameters is transmitted to the user side in real time through the CORS system, so that the purpose of real-time ground level elevation-like conversion is achieved, and the user can acquire high-precision normal high results in real time by using the method.
Drawings
FIG. 1 is a flow chart of a first embodiment of a normal high security service method according to the present application;
FIG. 2 is a parameterized flow chart of the present application based on a normal high security service system;
fig. 3 is a diagram of a normal high security service system architecture according to the present application.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will clearly and completely describe the technical solution in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
In one embodiment, referring to fig. 1, fig. 1 is a flowchart of a first embodiment of a normal high security service method according to the present application.
The embodiment of the application provides a normal high-security service method, which comprises the following steps:
s10, acquiring a service range of a CORS system, establishing a grid according to a set resolution, and acquiring a grid point coordinate set。
In some embodiments, step S10 may include:
s110, acquiring a service range of the CORS system, and building a buffer zone outside the service range of the CORS system.
It should be appreciated that the CORS system service scope may be determined by collecting data or may be manually defined.
It should be understood that when building the grid, a buffer area may not be set up, which may still implement positioning service for the user in the service range of the CORS system, but setting up a buffer area outside the service range of the CORS system may make coverage of the service area more complete, so as to avoid the problem of data missing at the edge of the service range of the CORS system. In a specific embodiment, the buffer size is set to 2 grid dot spacing.
S120, building a grid according to the set resolution in the service range of the CORS system and the buffer zone.
When the grid is specifically established, the grid can be uniformly divided according to the set resolution, but in order to improve the user experience, the resolution can be improved in areas with severe elevation change or higher precision requirements, so that the positioning precision of the areas can be further improved.
S130, acquiring coordinates of grid points to form a grid point coordinate set。
S20, using a quasi-geodesic model to coordinate the grid pointsCorrecting the coordinate elevation of the target coordinate system set +.>。
In some embodiments, step S20 may include:
s210, obtaining a geoid model of a grid rangeAnd grid Point coordinate set->Longitude and latitude of each coordinate in (a)>；
S220, according to the longitude and latitudeFrom the geoid model +.>Mid-query elevation outliersdH；
S230, the elevation outlier is processeddHSet of coordinate systems with destinationBonding to formObtaining the target coordinate system set->。
S30, collecting the grid point coordinate setAnd the set of destination coordinate systems +.>Converting to obtain the coordinate set of the original space rectangular coordinate system +.>Coordinate set of rectangular coordinate system of space with target +.>；
In some embodiments, step S30 may include:
s310, respectively calculating dot coordinate sets by using a first algorithmAnd the destination coordinate system setThe values of the space coordinates x, y and z of each coordinate point of the (a);
it should be appreciated that the first algorithm is a point-to-point calculation, dot coordinate setThe values of the respective coordinate points in (a) are all required to be calculated by using a first algorithm, and the target coordinate system set +.>Also the first algorithm is required to calculate each coordinate point in (a).
S320, according to the dot coordinate setAnd the set of destination coordinate systems +.>The space coordinate x, y and z values of each coordinate point of the (B) are obtained to obtain the original space rectangular coordinate system coordinate set +.>Coordinate set of rectangular coordinate system of space with target +.>。
The first algorithm comprises:
calculating the radius of the earth's mortise and tenon circleNAnd a first eccentricitye:
；
；
Wherein a is the equatorial radius of the reference ellipsoid and b is the polar radius of the reference ellipsoid;
calculating the space coordinates x, y and z of the coordinate points:
；
；
。
s40, calculating an original space rectangular coordinate system setRectangular coordinate system set of medium coordinates and target spaceSeven parameters and seven parameter fitting residual errors among the intermediate coordinates, and adjusting a preset central meridian until the seven parameter fitting residual errors are smaller than the preset central meridianA fixed threshold;
in some embodiments, step S40 may include:
calculating an original space rectangular coordinate system setRectangular coordinate system set of medium coordinates and target spaceSeven parameters among the middle coordinates and seven parameter fitting residual errors;
if the seven-parameter fitting residual is larger than the set threshold, adjusting a preset central meridian, and recalculating a target coordinate system setOriginal space rectangular coordinate set>Coordinate set of rectangular coordinate system of space with targetAnd further, calculating seven parameters and seven parameter fitting residuals again until the seven parameter fitting residuals are smaller than a set threshold.
Specifically, if the seven-parameter fitting residual is greater than the set threshold, the preset central meridian L is adjusted 0 And re-executing the steps S20-S40 until the obtained seven-parameter fitting residual is smaller than the set threshold.
S50, fitting the seven-parameter fitting residual errors smaller than a set threshold value into a residual error grid, and forming a loose geoid model by the residual error grid and the seven parameters together;
the method for combining seven-parameter fitting and residual grid correction by converting the quasi-geoid model into the seven-parameter fitting and residual grid correction is used for decomposing the confidential quasi-geoid refinement model into a parameter model (namely a seven-parameter set) and a grid model (namely a residual grid), so that the purpose of decryption is achieved by parameterizing the model, and the safety performance is improved.
S60, performing positioning service by using the decrypted geoid model.
Specifically, referring to fig. 2, fig. 2 is a schematic overall flow chart of a normal high security service method of the present application.
In a second aspect, an embodiment of the present application further provides a data broadcasting server, configured to perform a positioning service using the loose geoid model obtained by the method in any one of the first aspects, where the residual grid is pre-stored in the data broadcasting server, and the loose geoid model is not generated on the data broadcasting server.
It should be noted that the de-encrypted geoid model is not generated on the data dissemination server, but may be generated on a device that is isolated (not directly connected, nor indirectly connected) from the client device in order to further improve security. And, no real-time adjustment is required once the de-compact geoid model is formed. Therefore, the decryption of the geoid model can be completed on a separate device (the device which is completely and physically isolated from the outside is not connected with a local area network or the internet, and cannot be interconnected through satellite signals), and then the decryption of the geoid model is transferred to a data broadcasting server through a mobile device, so that the whole security high-service system cannot be directly or indirectly connected to the device forming the decryption of the geoid model, and the highest security requirement can be further achieved.
The data broadcasting server in this embodiment also has all the technical effects of the first aspect, and for the sake of saving the space, the first convenient specific method and the specific technical effects are not described herein.
In a third aspect, an embodiment of the present application further provides a normal high security service system, including a user side and a data broadcasting server. Please refer to fig. 2 to fig. 3.
The user is used for sending a differential data request to the data broadcasting server;
it should be appreciated that, upon receiving a user's differential data request, the data dissemination server responds to the differential data request for location services using the de-encrypted geodetic level model obtained by any of the methods of the first aspect. The de-compact ground level model includes seven parameters and a residual grid. The de-encrypted geoid model is pre-stored in the data dissemination server and in order to maintain isolation of the user from the confidential data, the location services performed by the de-encrypted geoid model are not generated on the data dissemination server.
The data broadcasting server obtains user position information based on a differential data request from a user side, determines seven-parameter fitting residual errors of corresponding positions in a residual error grid based on the position information, adds the seven-parameter fitting residual errors into VRS coordinates of the grid where the user is located, and generates virtual differential data.
Further, the seven parameters and the virtual differential data are encoded into 1021 and 1025 messages through RTCM encoding and then sent to the user side. And the user side receives the message and decodes the message to obtain the virtual differential data and seven parameters, and then performs differential positioning with satellite observation data to obtain a positioning result.
It will be appreciated that the non-secret-related seven parameters are encoded into 1021 messages, the projection parameters are encoded into 1025 messages, and the geodetic coordinate correction and elevation anomaly mesh are encoded into 1023 messages according to the coordinate conversion parameter messages 1021-1027 message types specified in the international standard differential data protocol RTCM3.2 and above.
The terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the foregoing drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those listed steps or elements but may include other steps or elements not listed or inherent to such process, method, article, or apparatus. The terms "first," "second," and "third," etc. are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order, and are not limited to the fact that "first," "second," and "third" are not identical.
In the description of embodiments of the present application, "exemplary," "such as," or "for example," etc., are used to indicate an example, instance, or illustration. Any embodiment or design described herein as "exemplary," "such as" or "for example" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "such as" or "for example," etc., is intended to present related concepts in a concrete fashion.
In the description of the embodiments of the present application, unless otherwise indicated, "/" means or, for example, a/B may represent a or B; the text "and/or" is merely an association relation describing the associated object, and indicates that three relations may exist, for example, a and/or B may indicate: the three cases where a exists alone, a and B exist together, and B exists alone, and in addition, in the description of the embodiments of the present application, "plural" means two or more than two.
In some of the processes described in the embodiments of the present application, a plurality of operations or steps occurring in a particular order are included, but it should be understood that these operations or steps may be performed out of the order in which they occur in the embodiments of the present application or in parallel, the sequence numbers of the operations merely serve to distinguish between the various operations, and the sequence numbers themselves do not represent any order of execution. In addition, the processes may include more or fewer operations, and the operations or steps may be performed in sequence or in parallel, and the operations or steps may be combined.
It will be appreciated by those skilled in the art that the hardware architecture employed herein is not limiting of the application, and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.
It should be noted that, the foregoing embodiment numbers are merely for describing the embodiments, and do not represent the advantages and disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising several instructions for causing a terminal device to perform the method described in the various embodiments of the present application.
The foregoing description is only of the preferred embodiments of the present application, and is not intended to limit the scope of the claims, and all equivalent structures or equivalent processes using the descriptions and drawings of the present application, or direct or indirect application in other related technical fields are included in the scope of the claims of the present application.
Claims (9)
1. A normal high security service method, the method comprising:
acquiring a service range of a CORS system, establishing a grid according to a set resolution, and acquiring a grid point coordinate set；
Using a geodetic model for the grid point coordinate setCorrecting the coordinate elevation of the target coordinate system set +.>；
Integrating the grid point coordinatesAnd the set of destination coordinate systems +.>Converting to obtain the coordinate set of the original space rectangular coordinate system +.>Coordinate set of rectangular coordinate system of space with target +.>；
Calculating an original space rectangular coordinate system setRectangular coordinate system set of middle coordinate and target space>Seven parameters and seven parameter fitting residual errors among the middle coordinates, and adjusting a preset central meridian until the seven parameter fitting residual errors are smaller than a set threshold value;
fitting the seven-parameter fitting residual errors smaller than a set threshold value into a residual error grid, and jointly forming a loose geoid model by the residual error grid and the seven parameters;
performing positioning service by using the decrypted geoid model;
the CORS system service range is obtained, a grid is established according to the set resolution, and a grid point coordinate set is obtainedComprising:
acquiring a service range of a CORS system, and establishing a buffer zone outside the service range of the CORS system;
establishing a grid according to a set resolution in the service range of the CORS system and the buffer area;
acquiring the coordinates of grid points to form the grid point coordinate set。
2. The normal high security service method of claim 1, wherein,
using a geodetic modelFor the grid point coordinate setCorrecting the coordinate elevation of the target coordinate system set +.>Comprising:
obtaining a geoid model of a grid rangeAnd grid Point coordinate set->Longitude and latitude of each coordinate in (a)>；
According to the longitude and latitudeFrom the geoid model +.>Mid-query elevation outliersdH；
Abnormal value of the elevationdHSet of coordinate systems with destinationBond formation->Obtaining the target coordinate system set->。
3. The normal high security service method of claim 1, wherein,
said integrating said grid point coordinate setAnd the set of destination coordinate systems +.>Converting to obtain the coordinate set of the original space rectangular coordinate system +.>Coordinate set of rectangular coordinate system of space with target +.>Comprising:
separately computing dot coordinate sets using a first algorithmAnd the set of destination coordinate systems +.>The values of the space coordinates x, y and z of each coordinate point of the (a);
according to the dot coordinate setAnd the set of destination coordinate systems +.>The space coordinate x, y and z values of each coordinate point of the (B) are obtained to obtain the original space rectangular coordinate system coordinate set +.>Coordinate set of rectangular coordinate system of space with target；
The first algorithm comprises:
calculating the radius of the earth's mortise and tenon circleNAnd a first eccentricitye:
；
；
Wherein a is the equatorial radius of the reference ellipsoid and b is the polar radius of the reference ellipsoid;
calculating the space coordinates x, y and z of the coordinate points:
；
；
。
4. the normal high security service method of claim 1, wherein,
the calculated original space rectangular coordinate system setRectangular coordinate system set of medium coordinates and target spaceSeven parameters and seven parameter fitting residuals between the middle coordinates, adjusting a preset central meridian to the seven parameter fitting residuals being smaller than a set threshold, including:
calculating an original space rectangular coordinate system setRectangular coordinate system set of middle coordinate and target space>Seven parameters among the middle coordinates and seven parameter fitting residual errors;
if the seven-parameter fitting residual is larger than the set threshold, adjusting a preset central meridian, and recalculating a target coordinate system setOriginal space rectangular coordinate set>Coordinate set of rectangular coordinate system of space with targetAnd further, calculating seven parameters and seven parameter fitting residuals again until the seven parameter fitting residuals are smaller than a set threshold.
5. A data dissemination server for performing a location service using a de-encrypted geodetic model obtained by the method of any of claims 1 to 4, the de-encrypted geodetic model being pre-stored in the data dissemination server and the de-encrypted geodetic model not being generated on the data dissemination server.
6. The normal high-security service system comprises a user side and a data broadcasting server, and is characterized in that:
the user is used for sending a differential data request to the data broadcasting server;
the data broadcasting server is used for responding to the differential data request and performing positioning service by using the loose geodetic level model obtained by the method of any one of claims 1-4, wherein the loose geodetic level model is pre-stored in the data broadcasting server, and the loose geodetic level model is not generated on the data broadcasting server.
7. The normal high security service system of claim 6, wherein the data dissemination server is further to:
based on a differential data request from a user side, obtaining user position information, determining seven-parameter fitting residual errors of corresponding positions in the decrypted geoid model based on the position information, adding the seven-parameter fitting residual errors into VRS coordinates of a grid where a user is located, and generating virtual differential data.
8. The normal high security service system of claim 7, wherein the data dissemination server is further to:
and encoding the virtual differential data and the seven parameters into 1021 and 1025 telegrams through RTCM encoding, and then transmitting the telegrams to a user side.
9. The normal high security service system of claim 8, wherein the ue is configured to receive the RTCM encoded virtual differential data and seven parameters, and perform differential positioning with satellite observation data after decoding, to obtain a positioning result.
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