Engineering measurement methods, CORS system

Abstract

This invention relates to the field of engineering surveying technology and discloses an engineering surveying method to solve the technical problems of slow measurement speed and inaccurate measurement results in existing engineering surveying methods. The method includes: receiving satellite positioning signals from GNSS satellites based on a CORS reference station, and parsing the satellite signals to obtain first positioning data corresponding to the CORS reference station; receiving satellite positioning signals from GNSS satellites based on a CORS rover station, and calculating second positioning data corresponding to the CORS rover station based on the satellite positioning signals; when the server receives a measurement request sent by a user, performing differential calculation on the first and second positioning data to obtain the position coordinates of the CORS rover station; determining the position coordinates of each measurement point in the construction area based on the position coordinates of the CORS rover station, and calculating the engineering surveying result requested in the measurement request based on the position coordinates of each measurement point.

Description

Technical Field

[0001] The present invention relates to the field of engineering measurement technology, and in particular to an engineering measurement method and a CORS system. Background Art

[0002] In the process of infrastructure construction such as railways, highways, and municipal projects, in order to ensure that the project effect meets the standards, it is necessary to ensure that the construction location is accurate and the project size obtained by the construction is accurate. In this process, it is necessary to measure a variety of data. Due to the different environments and times during the construction of different projects, the measurement work in different environments will encounter many obstacles such as mountains, forests, or surrounded by high-rise buildings, and will also encounter bad weather. Moreover, these situations may cause the terrain of the construction area to change during the construction process, so it is very important to quickly measure the construction area in real time.

[0003] The measurement method used in the prior art generally calibrates data and obtains measurement results through a reference station. However, the measurement method in the prior art takes a long time to work and requires a long time for field operations. In addition, the positioning accuracy is insufficient and is easily affected by the environment, resulting in slow measurement speed and inaccurate measurement results. Summary of the invention

[0004] The main purpose of the present invention is to solve the technical problems of slow measurement speed and inaccurate measurement results in the engineering measurement method in the prior art.

[0005] A first aspect of the present invention provides an engineering measurement method, which is applied to a CORS system, characterized in that the CORS system includes at least one CORS base station, at least one CORS mobile station and a server, wherein the CORS base station and the CORS mobile station are respectively arranged in a construction area corresponding to the engineering project to be measured, and the CORS mobile station corresponds to a measurement point in the construction area. The engineering measurement method includes: based on the CORS base station receiving a satellite positioning signal from a GNSS satellite, parsing the satellite signal to obtain first positioning data corresponding to the CORS base station; based on the CORS mobile station receiving a satellite positioning signal from the GNSS satellite, calculating second positioning data corresponding to the CORS mobile station according to the satellite positioning signal; when the server receives a measurement request sent by a user, the server performs a differential calculation on the first positioning data and the second positioning data to obtain the position coordinates of the CORS mobile station; according to the position coordinates of the CORS mobile station, the position coordinates of each measurement point in the construction area are determined, and according to the position coordinates of each measurement point, the engineering measurement result requested by the measurement request is calculated.

[0006] Optionally, in a first implementation manner of the first aspect of the present invention, when the number of the at least one CORS base station is at least two and the number of the at least one CORS mobile station is one, the differential calculation of the first positioning data and the second positioning data by the server to obtain the position coordinates of the CORS mobile station includes: using the server to calculate the distance between the CORS mobile station and each of the CORS base stations based on the second positioning data and the first positioning data; selecting a number of CORS base stations that meet the conditions from at least two of the CORS base stations as target CORS base stations based on the distance, and extracting the first positioning data corresponding to each of the target CORS base stations to obtain a target first positioning data set; performing differential calculation based on the target first positioning data set and the second positioning data to obtain the position coordinates of the CORS mobile station.

[0007] Optionally, in a second implementation manner of the first aspect of the present invention, when the number of the several target CORS reference stations is three, performing differential calculation based on the target first positioning data set and the second positioning data to obtain the position coordinates of the CORS mobile station includes: obtaining three synchronized target first positioning data of the three target CORS reference stations, wherein the target first positioning data include precise ephemeris and precise clock error; determining a triangulated network area based on the three target CORS reference stations; performing differential processing on the three target first positioning data to determine regional correction parameters of the triangulated network area; simulating an error correction model of the triangulated network area; performing differential calculation based on the target first positioning data set and the second positioning data to obtain a calculation result; and correcting the calculation result according to the error correction model of the triangulated network area to obtain the position coordinates of the CORS mobile station.

[0008] Optionally, in a third implementation method of the first aspect of the present invention, when the number of the several target CORS reference stations is one, the method of selecting several CORS reference stations that meet the conditions from at least two of the CORS reference stations as the target CORS reference stations according to the distance, and extracting the first positioning data corresponding to each of the target CORS reference stations, to obtain the target first positioning data set includes: sorting at least two of the CORS reference stations according to the distance to obtain a reference station distance sequence; extracting the CORS reference station corresponding to the smallest distance in the reference station distance sequence, and using the corresponding CORS reference station as the target CORS reference station.

[0009] Optionally, in a fourth implementation method of the first aspect of the present invention, calculating the engineering measurement result requested by the measurement request based on the position coordinates of each of the measuring points includes: obtaining the type of the position coordinates of the CORS mobile station and the plane rectangular coordinate type of the construction area; calculating the mathematical conversion relationship between the type and the plane rectangular coordinate type; converting the position coordinates of each of the measuring points according to the mathematical conversion relationship to obtain a converted coordinate result; and calculating the engineering measurement result based on the converted coordinate result.

[0010] Optionally, in the fifth implementation method of the first aspect of the present invention, before receiving the satellite positioning signal from the GNSS satellite based on the CORS base station, it also includes: obtaining the construction design documents of the engineering survey project, and determining the position of the reference point where the CORS base station is to be installed in the construction area according to the construction design documents; collecting environmental data of the position of the reference point, and evaluating whether the environment is qualified; if qualified, building a receiver bracket at the position of the reference point, and installing an outdoor receiver on the receiver bracket; installing an indoor server, and connecting the indoor server to the outdoor receiver; calling the indoor server to verify the position of the outdoor receiver with a pre-established known position point to obtain a CORS base station.

[0011] Optionally, in a sixth implementation of the first aspect of the present invention, the collecting of environmental data of the location of the reference point and the evaluation of whether the environment is qualified include: setting up a geodetic choke antenna at the location of the reference point, recording 24 hours of observation data of GNSS satellite signals at a sampling interval of 30 seconds, and calling a preset environmental detection software to analyze the observation data to obtain a software detection result; if the software detection result is passed, the environmental data is considered qualified; if the software detection result is failed, parsing the software detection result to determine whether the four indicators Cycle Slips, Multipath, Data Completeness, and Epochs With Data included in the software detection result are incorrect; if no error occurs, checking the signal-to-noise ratio; if the signal-to-noise ratio is within a preset signal-to-noise ratio threshold range, the environmental data is considered qualified; if the software detection result is failed, parsing the software detection result to determine whether the four indicators Cycle Slips, Multipath, Data Completeness, and Epochs With Data included in the software detection result are incorrect. Whether there are errors in the four indicators of Data, if there are errors, the preset environmental detection software is called to analyze and obtain the re-test results. If the re-test results are still unqualified, the environmental data is considered unqualified.

[0012] Optionally, in the seventh implementation method of the first aspect of the present invention, before parsing the satellite positioning signal from the GNSS satellite received by the CORS base station to obtain the first positioning data corresponding to the CORS base station, it also includes: obtaining the construction design document of the engineering project to be measured, determining the test location corresponding to the data to be measured according to the construction design document according to the engineering project to be measured, and marking the test location as a measurement point; installing the CORS mobile station at the measurement point.

[0013] A second aspect of the present invention provides a CORS system, comprising: at least one CORS base station, at least one CORS mobile station and a server that realize communication connection based on a network; the CORS mobile station is used to receive satellite positioning signals from GNSS satellites, parse the satellite signals to obtain first positioning data corresponding to the CORS base station, and send the first positioning data to the server; the CORS base station is used to receive satellite positioning signals from GNSS satellites, parse the satellite signals to obtain first positioning data corresponding to the CORS base station, and send the first positioning data to the server; the server is used to, when receiving a measurement request sent by a user, perform differential calculation on the first positioning data and the second positioning data through the server to obtain the position coordinates of the CORS mobile station; determine the position coordinates of each measuring point in the construction area according to the position coordinates of the CORS mobile station, and calculate the engineering measurement results requested by the measurement request according to the position coordinates of each measuring point.

[0014] Optionally, in a first implementation manner of the second aspect of the present invention, when the number of the at least one CORS reference station is at least two and the number of the at least one CORS mobile station is one, the server includes: a distance calculation module, used to use the server to calculate the distance between the CORS mobile station and each of the CORS reference stations based on the second positioning data and the first positioning data; a screening module, used to select a number of CORS reference stations that meet the conditions from at least two of the CORS reference stations as target CORS reference stations based on the distance, and extract the first positioning data corresponding to each of the target CORS reference stations to obtain a target first positioning data set; a differential calculation module, used to perform differential calculation based on the target first positioning data set and the second positioning data to obtain the position coordinates of the CORS mobile station.

[0015] Optionally, in a second implementation of the second aspect of the present invention, when the number of the several target CORS reference stations is three, the differential calculation module includes: a first positioning data extraction unit, used to obtain three synchronized first positioning data of the three target CORS reference stations, wherein the target first positioning data includes precise ephemeris and precise clock error; a triangulation network determination unit, used to determine the triangulation network area according to the three target CORS reference stations; a correction parameter determination unit, used to perform differential processing on the three target first positioning data to determine the regional correction parameters of the triangulation network area; a model simulation unit, used to simulate the error correction model of the triangulation network area; a calculation execution unit, used to perform differential calculation based on the target first positioning data set and the second positioning data to obtain a calculation result; a correction unit, used to correct the calculation result according to the error correction model of the triangulation network area to obtain the position coordinates of the CORS mobile station.

[0016] Optionally, in a third implementation method of the second aspect of the present invention, when the number of the several target CORS reference stations is one, the differential calculation module includes: a sorting unit, used to sort at least two of the CORS reference stations according to the distance to obtain a reference station distance sequence; a screening unit, used to extract the CORS reference station corresponding to the smallest distance in the reference station distance sequence, and use the corresponding CORS reference station as the target CORS reference station.

[0017] Optionally, in a fourth implementation method of the second aspect of the present invention, the server also includes a coordinate type conversion module, and the coordinate type conversion module includes: a type extraction unit, used to obtain the type of the position coordinates of the CORS mobile station, and the plane rectangular coordinate type of the construction area; a transformation relationship calculation unit, used to calculate the mathematical transformation relationship between the type and the plane rectangular coordinate type; a coordinate conversion unit, used to convert the position coordinates of each of the measuring points according to the mathematical transformation relationship to obtain a conversion coordinate result; and a result calculation unit, used to calculate the engineering measurement result based on the conversion coordinate result.

[0018] Optionally, in a fifth implementation manner of the second aspect of the present invention, the CORS system also includes a base station installation module, which is specifically used to: obtain the construction design documents of the engineering measurement project, and determine the position of the base point where the CORS base station is to be installed in the construction area according to the construction design documents; collect environmental data of the position of the base point, and evaluate whether the environment is qualified; if qualified, build a receiver bracket at the position of the base point, and install an outdoor receiver on the receiver bracket; install an indoor server, and connect the indoor server to the outdoor receiver; call the indoor server to verify the position of the outdoor receiver with a pre-established known position point to obtain a CORS base station.

[0019] Optionally, in a sixth implementation manner of the second aspect of the present invention, the base station installation module also includes an environmental assessment unit, which is specifically used to: set up a geodetic choke antenna at the location of the base point, record 24 hours of GNSS satellite signal observation data at a sampling interval of 30 seconds, and call a preset environmental detection software to analyze the observation data to obtain a software detection result; if the software detection result is passed, the environmental data is considered qualified; if the software detection result is failed, the software detection result is analyzed to determine whether the four indicators CycleSlips, Multipath, Data Completeness, and Epochs With Data included in the software detection result are incorrect; if no error occurs, the signal-to-noise ratio is checked; if the signal-to-noise ratio is within a preset signal-to-noise ratio threshold range, the environmental data is considered qualified; if the software detection result is failed, the software detection result is analyzed to determine whether the four indicators CycleSlips, Multipath, Data Completeness, and Epochs With Data included in the software detection result are incorrect. Whether there are errors in the four indicators of Data, if there are errors, the preset environmental detection software is called to analyze and obtain the re-test results. If the re-test results are still unqualified, the environmental data is considered unqualified.

[0020] Optionally, in a seventh implementation method of the second aspect of the present invention, the CORS system is also used to obtain construction design documents of the engineering project to be measured, determine the test location corresponding to the data to be measured according to the construction design documents, and mark the test location as a measurement point; and install the CORS mobile station at the measurement point.

[0021] In the technical solution provided by the present invention, based on the CORS base station receiving the satellite positioning signal from the GNSS satellite, the satellite signal is parsed to obtain the first positioning data corresponding to the CORS base station; based on the CORS mobile station receiving the satellite positioning signal from the GNSS satellite, the second positioning data corresponding to the CORS mobile station is calculated according to the satellite positioning signal; when the server receives the measurement request sent by the user, the server performs a differential calculation on the first positioning data and the second positioning data to obtain the position coordinates of the CORS mobile station; the position coordinates of each measuring point in the construction area are determined according to the position coordinates of the CORS mobile station, and the engineering measurement result requested by the measurement request is calculated according to the position coordinates of each measuring point, which can reduce the influence of obstacles and weather on the engineering measurement, improve the measurement speed and improve the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a flow chart of a first embodiment of an engineering measurement method according to an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of a flow chart of a second embodiment of an engineering measurement method according to an embodiment of the present invention;

[0024] Figure 3 It is a flow chart of a third embodiment of the engineering measurement method according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the structure of the CORS system in an embodiment of the present invention;

[0026] Figure 5 Schematic diagram of information processing of the CORS system in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In the technical solution provided by the present invention, based on the CORS base station receiving the satellite positioning signal from the GNSS satellite, the satellite signal is parsed to obtain the first positioning data corresponding to the CORS base station; based on the CORS mobile station receiving the satellite positioning signal from the GNSS satellite, the second positioning data corresponding to the CORS mobile station is calculated according to the satellite positioning signal; when the server receives the measurement request sent by the user, the server performs a differential calculation on the first positioning data and the second positioning data to obtain the position coordinates of the CORS mobile station; the position coordinates of each measuring point in the construction area are determined according to the position coordinates of the CORS mobile station, and the engineering measurement result requested by the measurement request is calculated according to the position coordinates of each measuring point, which can reduce the influence of obstacles and weather on the engineering measurement, improve the measurement speed and improve the measurement accuracy.

[0028] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "including" or "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0029] For ease of understanding, the specific process of the embodiment of the present invention is described below. Figure 1 An embodiment of the engineering measurement method in the embodiment of the present invention includes the following contents:

[0030] The engineering measurement method of this embodiment is a measurement method applied to a CORS system, wherein the CORS system includes at least one CORS base station, at least one CORS mobile station and a server, wherein the CORS base station and the CORS mobile station are respectively arranged in construction areas corresponding to the engineering project to be measured, and the CORS mobile station corresponds to a measurement point in the construction area.

[0031] Among them, the CORS base station is a pre-established reference station used as a reference, wherein the CORS is the abbreviation of Continuously Operating Reference Stations, which means a continuously operating (satellite positioning service) reference station established using multi-base station network RTK technology. The CORS system is a product of a combination of multiple technologies such as satellite positioning technology, computer network technology, and digital communication technology. CORS has expanded the coverage, reduced operating costs, improved positioning accuracy, and reduced positioning initialization time in engineering surveying. Among them, RTK technology refers to Real-time kinematic, that is, real-time differential positioning, which is a measurement method that can obtain centimeter-level positioning accuracy in real time in the field. Its emergence has greatly improved the efficiency of field operations.

[0032] 101. Receive a satellite positioning signal from a GNSS satellite based on a CORS base station, parse the satellite signal to obtain first positioning data corresponding to the CORS base station, and send the first positioning data to a server;

[0033] In this embodiment, the CORS single base station technology is used as an example for explanation. The single base station refers to a CORS base station with only one continuously running base station. This base station can also be used as a server. The software can be used to view the satellite status in real time, store static data, send differential information to the Internet in real time, and monitor the operation of the CORS mobile station. The CORS mobile station communicates with the base station server through GPRS and CDMA network communication methods. Before measuring, a CORS base station is built at the location range of the engineering measurement to be carried out. With less investment, a CORS base station can be established in a small or medium-sized city to meet the needs of local measurement users for spatial information technology services at different levels: the urban and suburban areas where the base station is located, along the main traffic lines of the city's imports and exports, and the districts, towns, and urban and rural areas within 30 kilometers of the base station as the center to achieve rapid centimeter-level real-time positioning and post-differentiation.

[0034] The single CORS reference station of this embodiment is built at the location range where the engineering measurement is to be carried out. This CORS reference station can be used multiple times after a one-time investment in the early stage. After the project is completed, the equipment is moved to the next construction site, thereby ensuring the positioning measurement accuracy while saving engineering costs.

[0035] In this step, the CORS base station continuously observes the satellite signals of the GNSS satellite to obtain the "local precise ephemeris" and other correction parameters for the area and time period, packages and stores the static data according to user requirements, and sends the GNSS satellite information of the CORS base station to the specified location of the Eagle software on the server.

[0036] The GNSS (Global Navigation Satellite System) described in this embodiment is the abbreviation of the global navigation satellite system, which is a collective term for all global navigation satellite systems and their augmentation systems, and is an all-weather radio navigation system covering the entire world established using all navigation satellites in the world. Currently available global satellite navigation systems include the GPS of the United States, the GLONASS of Russia, the BDS (Beidou) of China, and the Galileo of Europe.

[0037] 102. Based on the CORS mobile station receiving a satellite positioning signal from a GNSS satellite, calculate second positioning data corresponding to the CORS mobile station according to the satellite positioning signal;

[0038] Determine the measurement point according to the measurement data required in the engineering design document, place the CORS mobile station at the measurement point, call the CORS mobile station to receive the satellite positioning signal from the GNSS satellite, calculate the second positioning data corresponding to the current CORS mobile station according to the satellite positioning signal, and send the second positioning data to the server through the GPRS / CDMA data communication module.

[0039] 103. When the server receives the measurement request sent by the user, the server performs a differential calculation on the first positioning data and the second positioning data to obtain the position coordinates of the CORS mobile station;

[0040] The user can operate on the CORS mobile station, send a positioning acquisition request to the server through the communication unit of the CORS mobile station, obtain the first positioning data provided by the CORS base station through the server, and input the first positioning data and the second positioning data into the user unit for differential calculation to obtain the specific location coordinates of the CORS mobile station.

[0041] 104. Determine the position coordinates of each measuring point in the construction area according to the position coordinates of the CORS mobile station, and calculate the engineering measurement result requested by the measurement request according to the position coordinates of each measuring point.

[0042] After obtaining the position coordinates of the CORS mobile station, the position coordinates of the measurement point where the current mobile station is located can be determined. Among them, the position of the measurement point described in this step is specifically determined according to the content to be measured in the construction design document. Take a specific example to illustrate, when the content to be measured is the distance between two points, the measurement point is determined according to the position of the two points, the CORS mobile station is respectively located at two corresponding measurement points, and the specific measured measurement point position coordinates are calculated through the measurement request, and the specific distance between the two points to be obtained is calculated based on the position coordinates of the two measurement points obtained. In this embodiment, when performing specific measurements, a CORS mobile station can be used to obtain the position coordinates when it moves to multiple measurement points to be measured, or multiple CORS mobile stations can be used to simultaneously set to multiple different measurement points to be measured to obtain the position coordinates. Among them, when multiple CORS mobile stations are simultaneously set up at multiple different measurement points to be measured to obtain position coordinates, if there are multiple CORS base stations within the construction range, the CORS base station can be selected according to the preset base station selection method and the first positioning data corresponding to the selected base station can be obtained to obtain the position coordinates of the measurement point. To illustrate with a specific example, the CORS base station closest to the CORS mobile station can be selected and the first positioning data corresponding to the selected base station can be obtained to obtain the position coordinates of the measurement point.

[0043] The embodiment of the present invention exchanges signals with a satellite through a CORS base station to determine the position coordinates of a CORS mobile station and a CORS reference station, thereby calculating engineering measurement results according to the tested position coordinates; the influence of obstacles and weather on engineering measurements can be reduced, and the measurement speed and measurement accuracy can be improved.

[0044] See also Figure 2, the second embodiment of the engineering measurement method in the embodiment of the present invention includes:

[0045] 201. Obtain the construction design document of the engineering measurement project, and determine the location of the reference point of the CORS reference station to be installed in the construction area according to the construction design document;

[0046] In this embodiment, the CORS reference station is firstly sited according to the construction design document to determine the location of the reference point.

[0047] Specifically, the CORS reference station site selection design principles are as follows:

[0048] (1) Stay away from tall buildings, trees, water bodies, beaches and areas prone to water accumulation. The distance should be no less than 200m;

[0049] (2) There should be a satellite visibility condition with a horizon elevation angle of more than 10°;

[0050] (3) Stay away from electromagnetic interference areas (microwave stations, radio transmitters, high-voltage line crossing areas, etc.) and lightning strike areas, with a distance of no less than 200m;

[0051] (4) Avoid places prone to vibration, such as railways and roads;

[0052] (5) CORS base stations should avoid areas with unstable geological structures: fault fracture zones, locations prone to local deformation such as landslides and subsidence (such as mining areas, oil and gas production areas, groundwater funnel settlement areas, etc.), and locations prone to flooding or large changes in groundwater levels;

[0053] (6) Easy access to public communication networks;

[0054] (7) Have a stable, safe and reliable AC power supply;

[0055] (8) Conduct a site survey to confirm the load-bearing capacity of the site. The final site should be established on load-bearing columns or load-bearing walls.

[0056] 202. Collect environmental data of the location of the benchmark and evaluate whether the environment is qualified;

[0057] 203. If qualified, build a receiver bracket at the location of the reference point and install an outdoor receiver on the receiver bracket;

[0058] After the benchmark point is determined, the environment of the benchmark point is evaluated to see if it meets the above principles and the surrounding environmental interference is within the threshold range. If the environmental evaluation result is qualified, a CORS benchmark station is built at the location of the above benchmark point.

[0059] The CORS base station of this embodiment is composed of two parts: indoor equipment and outdoor equipment, which mainly include: lightning protection equipment, external receiver (GNSS antenna), server (computer), display, external network equipment, and uninterruptible power supply.

[0060] Specifically, first, a receiver bracket is provided, and an outdoor receiver is installed on the bracket. The bracket of this embodiment can be a cement pier or a tripod. This embodiment takes a tripod as an example: the tripod is welded with angle steel, and the bottom triangle size can be set to a 40×40 (cm) right-angle isosceles triangle with a height of 40 cm. The upper triangle is welded with a centering plate and fixed at the selected reference point.

[0061] Then, connect the outdoor receiver to the cement pier or the tripod centering plate with connecting bolts, connect one end of the GPS signal line to the outdoor receiver, and connect the other end to the indoor CORS host along the edge of the roof. The GPS signal line exposed outdoors must be covered with a PVC protective sleeve to extend the service life of the GPS signal line. The PVC protective sleeve can be made of a PVC pipe with a diameter of 2cm to 5cm. The connection parts are connected with special PVC pipe joints and fixed with corresponding nail wire clips.

[0062] 204. Install an indoor server and connect the indoor server to an outdoor receiver;

[0063] 205. Calling the indoor server to check the position of the outdoor receiver with the pre-established known position point to obtain the CORS reference station;

[0064] Indoor equipment consists of servers (computers), monitors, CORS hosts, UPS relays, wireless routers, cabinets, etc. The specific connection relationships are as follows:

[0065] (1) The server needs to be powered on and running continuously for a long time;

[0066] (2) Indoor equipment is stored in a cabinet;

[0067] (3) The dedicated network cable should be connected to the server network interface, and then use one end of the network cable to connect to another network interface of the server, and the other end to connect to the CORS host network interface. If a computer host is used as a server, a router (wireless router is also acceptable) is required as an adapter, and the dedicated network cable is connected to the router WAN port, and then two network cables are connected to the router at one end, and the other ends are connected to the computer host and the CORS host respectively;

[0068] (4) The cabinet power supply is connected to the UPS relay to ensure that the server can maintain working status for a period of time after a power outage; or a battery is connected to the UPS relay for continuous power supply;

[0069] (5) Both the indoor CORS host and network cable connector need to be grounded.

[0070] After the installation is complete, debug the server, and after debugging is completed, the constructed CORS base station is obtained.

[0071] 206. Receiving a satellite positioning signal from a GNSS satellite based on the CORS base station, parsing the satellite signal to obtain first positioning data corresponding to the CORS base station;

[0072] The number of CORS reference stations described in this embodiment is at least two, and each CORS reference station receives a satellite positioning signal from a GNSS satellite, and parses the satellite signal to obtain first positioning data corresponding to the CORS reference station. The first positioning data corresponds to the CORS reference station one-to-one, and after the first positioning data is obtained, the first positioning data is sent to the server.

[0073] 207. Based on the CORS mobile station receiving a satellite positioning signal from a GNSS satellite, calculate second positioning data corresponding to the CORS mobile station according to the satellite positioning signal;

[0074] Determine the measurement point according to the measurement data required in the engineering design document, place the CORS mobile station at the measurement point, call the CORS mobile station to receive the satellite positioning signal from the GNSS satellite, calculate the second positioning data corresponding to the current CORS mobile station according to the satellite positioning signal, and send the second positioning data to the server through the GPRS / CDMA data communication module.

[0075] 208. Calculate, by using the server, the distance between the CORS mobile station and each CORS reference station according to the second positioning data and the first positioning data;

[0076] Among them, according to the aforementioned steps, there are at least two CORS reference stations in this embodiment, and at least two first positioning data are obtained. Then, the distance between the CORS mobile station and each CORS reference station in this embodiment is analyzed according to the second positioning data and each first positioning data, and each CORS reference station is sorted according to the distance between the CORS mobile station and each CORS reference station to obtain a CORS reference station sequence.

[0077] 209. Selecting a number of CORS reference stations that meet the conditions from at least two CORS reference stations as target CORS reference stations according to the distance, and extracting first positioning data corresponding to each target CORS reference station to obtain a target first positioning data set;

[0078] The target CORS reference station closest to the CORS mobile station is extracted from the CORS reference station sequence as the target CORS reference station, the first positioning data corresponding to the target CORS reference station is extracted, the target first positioning data is obtained, and specific calculations are performed according to the target first positioning data in subsequent steps.

[0079] 210. Perform differential calculation based on the first positioning data set and the second positioning data of the target to obtain the position coordinates of the CORS mobile station;

[0080] The position coordinates of the CORS mobile station are determined by performing differential calculation based on the first positioning data and the second positioning data of the target. Specifically, the specific calculation formula is:

[0081]

[0082] in, represents the phase measurement value; ρ represents the geometric distance between the star stations; c represents the speed of light; d T Indicates the receiver clock error; d t represents the satellite clock error; λ represents the carrier phase wavelength; N represents the integer unknown number; d trop represents the influence of tropospheric refraction; d ion Represents the effect of ionospheric refraction; d preal represents the relativistic effect, represents the observation noise.

[0083] 211. Obtain the type of the position coordinates of the CORS mobile station and the plane rectangular coordinate type of the construction area;

[0084] 212. Calculate the mathematical conversion relationship between the type of position coordinates and the type of local plane rectangular coordinates;

[0085] 213. According to the mathematical transformation relationship, the position coordinates of each measuring point are transformed to obtain the transformation coordinate results;

[0086] 214. Calculate the engineering measurement results based on the converted coordinate results.

[0087] The position coordinates of the measurement point are determined according to the position coordinates of the CORS mobile station obtained above, wherein the position coordinates include a variety of different coordinate types. When the GNSS satellite in this embodiment is a GPS satellite, the position coordinates of the CORS mobile station obtained in this embodiment are WGS84 coordinates. The local plane rectangular coordinate type required for use in this embodiment is obtained, and the mathematical conversion relationship between the position coordinate type and the local plane rectangular coordinate type is calculated.

[0088] The data collected by the GPS satellite positioning system in engineering applications is WGS84 coordinate system data, while the coordinate data currently used in the summary of construction survey results is based on the 1954 Beijing coordinate system or the local (arbitrary or local) independent coordinate system. Therefore, the WGS84 coordinates must be converted to the BJ-54 coordinate system or the local (arbitrary) independent coordinate system. Converting the GPS coordinate system to our local plane coordinate system includes: datum conversion, projection, horizontal and vertical adjustment. Finally, the converted coordinate results are obtained, and the engineering measurement results are calculated based on the converted coordinate results.

[0089] The embodiment of the present invention exchanges signals with a satellite through a CORS base station to determine the position coordinates of a CORS mobile station and a target CORS reference station, thereby calculating an engineering measurement result according to the tested position coordinates; the influence of obstacles and weather on the engineering measurement can be reduced, and the measurement speed and measurement accuracy can be improved.

[0090] See also Figure 3 , a third embodiment of the engineering measurement method in the embodiment of the present invention includes:

[0091] 301. Obtain the construction design document of the engineering measurement project, and determine the location of the reference point of the CORS reference station to be installed in the construction area according to the construction design document;

[0092] The specific content of this step is basically the same as that of step 201 in the above embodiment, so it will not be repeated here.

[0093] 302. Collect environmental data of the location of the benchmark and evaluate whether the environment is qualified;

[0094] After determining the specific location of the benchmark point, it is necessary to evaluate the environment of the benchmark point to see whether the environment meets the above principles and whether the surrounding environmental interference is within the threshold range.

[0095] Specifically, in this step, a geodetic choke antenna is set up at the location of the reference point and connected to the CORS host, and the observation data of the GNSS satellite signal for 24 hours is recorded at a sampling interval of 30 seconds, and the observation data is analyzed using the preset environmental detection software;

[0096] If the environmental data passes the test by the preset environmental testing software, the environmental data is considered qualified, wherein the environmental testing software may be QC software;

[0097] If the preset environment detection software fails to detect, the detection results are obtained to determine whether the four indicators of Cycle Slips, Multipath, Data Completeness, and Epochs With Data contained in the detection results have errors. If no errors are found, the signal-to-noise ratio is checked in conjunction with the NOVATEL CDU software. If the signal-to-noise ratio is within the preset signal-to-noise ratio threshold range, the environment data is considered qualified.

[0098] If the preset environment detection software fails to pass the detection, the detection result is obtained to determine whether the four indicators of Cycle Slips, Multipath, Data Completeness, and Epochs With Data included in the detection result are wrong. If so, it is necessary to retest and obtain the retest result. If the retest result is still failed, it is considered that the environment has large interference and is not suitable for site construction.

[0099] 303. If qualified, build a receiver bracket at the location of the reference point and install an outdoor receiver on the receiver bracket;

[0100] 304. Install an indoor server and connect the indoor server to an outdoor receiver;

[0101] 305. Calling the indoor server to check the position of the outdoor receiver with the pre-established known position point to obtain the CORS reference station;

[0102] The contents of step 303 to step 305 of this embodiment are substantially the same as those of step 203 to step 205 of the aforementioned embodiment, and thus will not be described in detail here.

[0103] 306. Receive a satellite positioning signal from a GNSS satellite based on the CORS base station, parse the satellite signal to obtain first positioning data corresponding to the CORS base station, and send the first positioning data to a server;

[0104] This embodiment is described with the number of CORS reference stations being at least three; each CORS reference station described in this embodiment receives a satellite positioning signal from a GNSS satellite, and parses the satellite signal to obtain the first positioning data corresponding to the CORS reference station. The first positioning data corresponds one-to-one to the CORS reference station, and after the first positioning data is obtained, the first positioning data is sent to the server. According to the tree age of the CORS reference station, a triangular network, a geodetic quadrilateral network, a belt network, a ring network or a star network is formed to improve the accuracy of positioning.

[0105] In this embodiment, when the number of CORS reference stations is at least three, the three CORS reference stations closest to the CORS mobile station are determined according to the first positioning data of each CORS reference station, and a triangular network area is formed according to these three CORS reference stations. The subsequent position of the CORS mobile station is specifically determined according to the first positioning information of these three CORS reference stations.

[0106] 307. Based on the CORS mobile station receiving a satellite positioning signal from a GNSS satellite, calculate second positioning data corresponding to the CORS mobile station according to the satellite positioning signal;

[0107] Determine the measurement point according to the measurement data required in the engineering design document, place the CORS mobile station at the measurement point, call the CORS mobile station to receive the satellite positioning signal from the GNSS satellite, calculate the second positioning data corresponding to the current CORS mobile station according to the satellite positioning signal, and send the second positioning data to the server through the GPRS / CDMA data communication module.

[0108] 308. When the server receives the measurement request sent by the user, obtain the first positioning data of three targets synchronized by three target CORS reference stations;

[0109] 309. Determine the triangulated network area based on the three target CORS reference stations;

[0110] 310. Perform differential processing on the first positioning data of the three targets to determine the regional correction parameters of the triangulated network area;

[0111] 311. Simulate the error correction model of the triangular network area;

[0112] 312. Perform differential calculation based on the target first positioning data set and the second positioning data to obtain a calculation result;

[0113] 313. Correct the calculation results according to the error correction model of the triangulated network area to obtain the position coordinates of the CORS mobile station;

[0114] In this embodiment, a triangular network CORS is used for measurement, and reference stations can be evenly and sparsely deployed in a larger range. The real-time observation data of the reference station network is used to model the system error of the coverage area, and then the system error of the observation data of the mobile user stations in the area is estimated to eliminate the influence of the system error as much as possible, and obtain centimeter-level real-time positioning results. The accuracy coverage of the network RTK technology is greatly increased, and the accuracy distribution is uniform.

[0115] Specifically, when performing measurement calculations, when using a triangulated network, the first positioning data of the target includes precise ephemeris and precise clock error; using precise ephemeris and precise clock error, collect the synchronous observations of the three nearest reference stations for differential processing, generate a set of regional correction parameters for each triangle, and simulate the comprehensive error correction model in the area through the triangulated network. The model covers the area within the triangulated network and 30 kilometers outside the network.

[0116] The observation data of multiple CORS reference stations are used to optimize the comprehensive error models such as ionosphere, troposphere, and orbit error, while continuously monitoring the integrity of the reference station data. During operation, the mobile station needs to send its point information (GGA data) to the central control center through two-way data communication devices such as GPRS and CDMA. Based on the position of the mobile station, the system calculates the GPS orbit error, ionosphere, troposphere, and atmospheric refraction errors of the point, and sends the comprehensive error of the position correction to the CORS mobile station. The effect is equivalent to generating a "virtual reference station" at the mobile station position for short baseline solution. The mobile station uses the correction number of the comprehensive error sent back by the central control system to achieve real-time differential positioning.

[0117] In addition, in this embodiment, the position coordinates of the CORS mobile station are calculated based on the selected target CORS reference station. When there are three target CORS reference stations, three calculation results are obtained. While correcting the obtained calculation results, the degree of deviation of the obtained results is also calculated; and the calculation results are screened according to the obtained degree of deviation to obtain the final position coordinates of the CORS mobile station.

[0118] 314. Determine the position coordinates of each measuring point in the construction area according to the position coordinates of the CORS mobile station, and calculate the engineering measurement result requested by the measurement request according to the position coordinates of each measuring point.

[0119] After the position coordinates of the CORS mobile station are obtained, the position coordinates of the preset measuring points can be determined. The position coordinates of the measuring points in this step are specifically determined according to the content to be measured in the construction design document.

[0120] The embodiment of the present invention exchanges signals with a satellite through a CORS base station to determine the position coordinates of a CORS mobile station and a target CORS reference station, and further reduces errors through positioning data of multiple target CORS reference stations, thereby calculating engineering measurement results based on the tested position coordinates, and being able to automatically calculate the results in a required coordinate system; the influence of obstacles and weather on engineering measurements can be reduced, and the measurement speed and accuracy can be improved.

[0121] The above describes the engineering measurement method in the embodiment of the present invention. The following describes the CORS system in the embodiment of the present invention. Figure 4 as well as Figure 5 , an embodiment of the CORS system in the embodiment of the present invention includes:

[0122] At least one CORS reference station 401, a server 402 and at least one CORS mobile station 403 that are connected to each other via a network;

[0123] The CORS mobile station 403 is used to receive satellite positioning signals from GNSS satellites, parse the satellite signals to obtain first positioning data corresponding to the CORS reference station 401, and send the first positioning data to the server 402;

[0124] The CORS reference station 401 is used to receive satellite positioning signals from GNSS satellites, parse the satellite signals to obtain first positioning data corresponding to the CORS reference station 401, and send the first positioning data to the server 402;

[0125] The server 402 is used to perform differential calculation on the first positioning data and the second positioning data through the server 402 when receiving a measurement request sent by the user, so as to obtain the position coordinates of the CORS mobile station 403; determine the position coordinates of each measuring point in the construction area according to the position coordinates of the CORS mobile station 403, and calculate the engineering measurement results requested by the measurement request according to the position coordinates of each measuring point.

[0126] In another embodiment of the present application, when the number of the at least one CORS reference station 401 is at least two, and the number of the at least one CORS mobile station 403 is one, the server 402 includes:

[0127] a distance calculation module, configured to calculate the distance between the CORS mobile station 403 and each of the CORS reference stations 401 using the server 402 according to the second positioning data and the first positioning data;

[0128] A screening module, configured to select a plurality of CORS reference stations 401 meeting the conditions from at least two of the CORS reference stations 401 as target CORS reference stations 401 according to the distance, and extract the first positioning data corresponding to each of the target CORS reference stations 401 to obtain a target first positioning data set;

[0129] The differential calculation module is used to perform differential calculation according to the target first positioning data set and the second positioning data to obtain the position coordinates of the CORS mobile station 403.

[0130] In another embodiment of the present application, when the number of the target CORS reference stations 401 is three, the difference calculation module includes:

[0131] A first positioning data extraction unit, used for acquiring the three first positioning data of the target synchronously of the three target CORS reference stations 401, wherein the first positioning data of the target includes precise ephemeris and precise clock error;

[0132] A triangulated network determining unit, configured to determine a triangulated network area according to the three target CORS reference stations 401;

[0133] A correction parameter determination unit, used for performing differential processing on the first positioning data of the three targets to determine the regional correction parameters of the triangulated network area;

[0134] A model simulation unit, used for simulating an error correction model of the triangulated network area;

[0135] A calculation execution unit, used for performing a differential calculation based on the target first positioning data set and the second positioning data to obtain a calculation result;

[0136] The correction unit is used to correct the calculation result according to the error correction model of the triangulated network area to obtain the position coordinates of the CORS mobile station 403.

[0137] In another embodiment of the present application, when the number of the target CORS reference stations 401 is one, the difference calculation module includes:

[0138] A sorting unit, configured to sort at least two of the CORS reference stations 401 according to the distances to obtain a reference station distance sequence;

[0139] The screening unit is used to extract the CORS reference station 401 corresponding to the smallest distance in the reference station distance sequence, and use the obtained corresponding CORS reference station 401 as the target CORS reference station 401.

[0140] In another embodiment of the present application, the server 402 further includes a coordinate type conversion module, and the coordinate type conversion module includes:

[0141] A type extraction unit, used to obtain the type of the position coordinates of the CORS mobile station 403 and the plane rectangular coordinate type of the construction area;

[0142] A conversion relationship calculation unit, used for calculating the mathematical conversion relationship between the type and the plane rectangular coordinate type;

[0143] A coordinate conversion unit, used for converting the position coordinates of each of the measuring points according to the mathematical conversion relationship to obtain a conversion coordinate result;

[0144] The result calculation unit is used to calculate the engineering measurement result according to the converted coordinate result.

[0145] In another embodiment of the present application, the CORS system further includes a reference station installation module, and the reference station installation module is specifically used to:

[0146] Obtain a construction design document of the engineering survey project, and determine the position of the reference point of the CORS reference station 401 to be installed in the construction area according to the construction design document;

[0147] Collecting environmental data of the location of the reference point and evaluating whether the environment is qualified;

[0148] If qualified, a receiver bracket is constructed at the location of the reference point, and an outdoor receiver is installed on the receiver bracket;

[0149] Install an indoor server and connect the indoor server to the outdoor receiver;

[0150] The indoor server is called to check the position of the outdoor receiver with a pre-established known position point to obtain a CORS reference station 401.

[0151] In another embodiment of the present application, the reference station installation module further includes an environment assessment unit, and the environment assessment unit is specifically used to:

[0152] A geodetic choke antenna is set up at the location of the reference point, 24 hours of GNSS satellite signal observation data is recorded at a sampling interval of 30 seconds, and a preset environmental detection software is called to analyze the observation data to obtain a software detection result;

[0153] If the software test result is passed, the environmental data is considered qualified;

[0154] If the software detection result is not passed, the software detection result is analyzed to determine whether the four indicators of Cycle Slips, Multipath, Data Completeness, and Epochs With Data included in the software detection result have errors. If no errors occur, the signal-to-noise ratio is checked. If the signal-to-noise ratio is within a preset signal-to-noise ratio threshold range, the environmental data is considered qualified.

[0155] If the software detection result is failed, the software detection result is analyzed to determine whether there are errors in the four indicators of Cycle Slips, Multipath, Data Completeness, and Epochs With Data included in the software detection result. If an error occurs, the preset environment detection software is called to analyze and obtain the retest result. If the retest result is still failed, the environment data is considered unqualified.

[0156] In another embodiment of the present application, the CORS system is also used to obtain the construction design documents of the engineering project to be measured, determine the test location corresponding to the data to be measured according to the construction design documents, and mark the test location as a measurement point; and install the CORS mobile station 403 at the measurement point.

[0157] The embodiment of the present invention exchanges signals with a satellite through a CORS base station to determine the position coordinates of a CORS mobile station and a target CORS reference station, and further reduces errors through positioning data of multiple target CORS reference stations, thereby calculating engineering measurement results based on the tested position coordinates, and being able to automatically calculate the results in a required coordinate system; the influence of obstacles and weather on engineering measurements can be reduced, and the measurement speed and accuracy can be improved.

[0158] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An engineering measurement method, applied to a CORS system, characterized in that: The CORS system includes at least one CORS reference station, at least one CORS mobile station and a server, wherein the CORS reference station and the CORS mobile station are respectively arranged in a construction area corresponding to the engineering project to be measured, and the CORS mobile station corresponds to a measurement point in the construction area. The engineering measurement method includes: Receiving a satellite positioning signal from a GNSS satellite based on the CORS reference station, parsing the satellite signal to obtain first positioning data corresponding to the CORS reference station; Based on the CORS mobile station receiving the satellite positioning signal from the GNSS satellite, calculating the second positioning data corresponding to the CORS mobile station according to the satellite positioning signal; When the server receives the measurement request sent by the user, the server performs a differential calculation on the first positioning data and the second positioning data to obtain the position coordinates of the CORS mobile station; Determine the position coordinates of each measuring point in the construction area according to the position coordinates of the CORS mobile station, and calculate the engineering measurement result requested by the measurement request according to the position coordinates of each measuring point; When the number of the at least one CORS reference station is at least two, and the number of the at least one CORS mobile station is one, performing differential calculation on the first positioning data and the second positioning data by the server to obtain the position coordinates of the CORS mobile station includes: using the server to calculate the distance between the CORS mobile station and each of the CORS reference stations according to the second positioning data and the first positioning data; selecting a number of CORS reference stations that meet the conditions from at least two of the CORS reference stations as target CORS reference stations according to the distance, and extracting the first positioning data corresponding to each of the target CORS reference stations to obtain a target first positioning data set; performing differential calculation on the target first positioning data set and the second positioning data to obtain the position coordinates of the CORS mobile station; When the number of the several target CORS reference stations is three, performing differential calculation based on the target first positioning data set and the second positioning data to obtain the position coordinates of the CORS mobile station includes: acquiring three synchronized first positioning data of the three target CORS reference stations, wherein the target first positioning data include precise ephemeris and precise clock error; determining a triangulated network area based on the three target CORS reference stations; performing differential processing on the three target first positioning data to determine regional correction parameters of the triangulated network area; simulating an error correction model of the triangulated network area; performing differential calculation based on the target first positioning data set and the second positioning data to obtain a calculation result; and correcting the calculation result based on the error correction model of the triangulated network area to obtain the position coordinates of the CORS mobile station.

2. The engineering measurement method according to claim 1, characterized in that: When the number of the target CORS reference stations is one, selecting a plurality of CORS reference stations that meet the conditions from at least two of the CORS reference stations as the target CORS reference stations according to the distance, and extracting the first positioning data corresponding to each of the target CORS reference stations, to obtain the target first positioning data set includes: Sorting at least two of the CORS reference stations according to the distances to obtain a reference station distance sequence; A CORS reference station corresponding to the smallest distance in the reference station distance sequence is extracted, and the corresponding CORS reference station obtained is used as a target CORS reference station.

3. The engineering measurement method according to any one of claims 1 to 2, characterized in that: The step of calculating the engineering measurement result requested by the measurement request according to the position coordinates of each of the measurement points includes: Obtaining the type of the position coordinates of the CORS mobile station and the type of the plane rectangular coordinates of the construction area; Calculate the mathematical conversion relationship between the type and the plane rectangular coordinate type; According to the mathematical transformation relationship, the position coordinates of each of the measuring points are transformed to obtain a transformation coordinate result; The engineering measurement result is calculated according to the converted coordinate result.

4. The engineering measurement method according to claim 3, characterized in that: Before receiving the satellite positioning signal from the GNSS satellite based on the CORS reference station, the method further includes: Obtaining a construction design document of an engineering measurement project, and determining the position of a reference point of the CORS reference station to be installed in a construction area according to the construction design document; Collecting environmental data of the location of the reference point and evaluating whether the environment is qualified; If qualified, a receiver bracket is constructed at the location of the reference point, and an outdoor receiver is installed on the receiver bracket; Install an indoor server and connect the indoor server to the outdoor receiver; The indoor server is called to check the position of the outdoor receiver with a pre-established known position point to obtain a CORS reference station.

5. The engineering measurement method according to claim 1, characterized in that: The collecting of the environmental data of the location of the reference point and evaluating whether the environment is qualified includes: A geodetic choke antenna is set up at the location of the reference point, 24 hours of GNSS satellite signal observation data is recorded at a sampling interval of 30 seconds, and a preset environmental detection software is called to analyze the observation data to obtain a software detection result; If the software test result is passed, the environmental data is considered qualified; If the software detection result is not passed, the software detection result is analyzed to determine whether the four indicators of Cycle Slips, Multipath, Data Completeness, and Epochs With Data included in the software detection result have errors. If no errors occur, the signal-to-noise ratio is checked. If the signal-to-noise ratio is within a preset signal-to-noise ratio threshold range, the environmental data is considered qualified. If the software detection result is failed, the software detection result is analyzed to determine whether there are errors in the four indicators of Cycle Slips, Multipath, Data Completeness, and Epochs With Data included in the software detection result. If an error occurs, the preset environment detection software is called to analyze and obtain the retest result. If the retest result is still failed, the environment data is considered unqualified.

6. The engineering measurement method according to claim 5, characterized in that: Before parsing the satellite positioning signal from the GNSS satellite received by the CORS reference station to obtain the first positioning data corresponding to the CORS reference station, the method further includes: Obtaining the construction design document of the engineering project to be measured, determining the test location corresponding to the data to be measured according to the construction design document and marking the test location as a measurement point; The CORS mobile station is installed at the measurement point.

7. A CORS system, characterized in that: The CORS system includes: at least one CORS reference station, at least one CORS mobile station and a server that realize communication connection based on a network; The CORS reference station is used to receive a satellite positioning signal from a GNSS satellite, parse the satellite signal to obtain first positioning data corresponding to the CORS reference station, and send the first positioning data to a server; The CORS mobile station is used to receive a satellite positioning signal from a GNSS satellite, parse the satellite signal to obtain second positioning data corresponding to the CORS mobile station, and send the second positioning data to a server; The server is used to, when receiving a measurement request sent by a user, perform differential calculation on the first positioning data and the second positioning data through the server to obtain the position coordinates of the CORS mobile station; determine the position coordinates of each measuring point in the construction area according to the position coordinates of the CORS mobile station, and calculate the engineering measurement result requested by the measurement request according to the position coordinates of each measuring point; When the number of the at least one CORS reference station is at least two, and the number of the at least one CORS mobile station is one, the server includes: a distance calculation module, used to use the server to calculate the distance between the CORS mobile station and each of the CORS reference stations according to the second positioning data and the first positioning data; a screening module, used to select a number of CORS reference stations that meet the conditions from at least two of the CORS reference stations as target CORS reference stations according to the distance, and extract the first positioning data corresponding to each of the target CORS reference stations to obtain a target first positioning data set; a differential calculation module, used to perform differential calculation based on the target first positioning data set and the second positioning data to obtain the position coordinates of the CORS mobile station; When the number of the target CORS reference stations is three, the differential calculation module includes: a first positioning data extraction unit, used to obtain three synchronized first positioning data of the three target CORS reference stations, wherein the target first positioning data includes precise ephemeris and precise clock error; a triangulated network determination unit, used to determine the triangulated network area according to the three target CORS reference stations; a correction parameter determination unit, used to perform differential processing on the three target first positioning data to determine the regional correction parameters of the triangulated network area; a model simulation unit, used to simulate the error correction model of the triangulated network area; a calculation execution unit, used to perform differential calculation based on the target first positioning data set and the second positioning data to obtain a calculation result; a correction unit, used to correct the calculation result according to the error correction model of the triangulated network area to obtain the position coordinates of the CORS mobile station.

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