GNSS (Global Navigation Satellite System) plane retest method, system, equipment and medium

Abstract

The invention provides a GNSS plane retest method, system, device and medium, and belongs to the technical field of high-speed railway measurement, and the method comprises the following steps: determining a combined retest mode of a CPI control network, a CPII control network and an encryption control network according to the number of GNSS receivers; and starting to arrange observation stations from the starting point of the line according to the determined combined remeasurement mode until reaching the end point of the line, carrying out field measurement according to the determined observation time period number after the observation stations are arranged each time, and carrying out unified indoor calculation on the combined remeasurement control network after the field measurement of all the observation stations is finished. According to the method, the number of times of remeasurement is reduced, the remeasurement period is shortened, the workload of repeated measurement and secondary recheck is reduced, and a guarantee is provided for the safety and the operation quality of the high-speed railway.

Description

Technical Field

[0001] The present invention belongs to the technical field of high - speed railway surveying, and particularly relates to a GNSS plane re - measurement method, system, device and medium. Background Art

[0002] GNSS, short for Global Navigation Satellite System, is a technology that uses navigation satellites for positioning and navigation. In the re - measurement of high - speed railway precise control networks and dense control networks, GNSS technology is widely used because it can provide high - precision and all - weather positioning services.

[0003] With the large - scale development of high - speed railways, the number of construction projects is increasing, and higher requirements are put forward for the establishment and re - measurement of precise control networks and dense control networks. Since precise control networks and dense control networks are the benchmarks for the construction accuracy of high - speed railways, their accuracy and stability are directly related to the safety and operation quality of high - speed railways.

[0004] The plane re - measurement of precise control networks and dense control networks usually adopts GNSS surveying technology. However, the traditional GNSS plane re - measurement method measures in the order of hierarchical measurement and step - by - step control. Specifically, it includes the re - measurement of CPI control network, CPII control network and dense control network. This measurement method has problems of many re - measurement times and low efficiency. Specifically, first, the re - measurement period is long. Since CPI control points need to be measured three times, CPII control points need to be measured twice, and dense control points need to be measured once, the entire re - measurement period is relatively long. Second, there are many repeated measurements. Since CPI control points and CPII control points need to be set up stations repeatedly, the measurement workload is increased. Finally, the secondary review is cumbersome. If the point position difference or the accuracy of adjacent points exceeds the limit during the re - measurement process, secondary review is required, further increasing the workload. Summary of the Invention

[0005] In a first aspect, an embodiment of the present application provides a GNSS plane re - measurement method, including the following steps: S1. Determine the combined re - measurement method of CPI control network, CPII control network and dense control network according to the number of GNSS receivers; S2. Arrange survey stations from the starting point of the line according to the determined combined re - measurement method until reaching the end point of the line. After each survey station is arranged, conduct field measurement according to the determined number of observation periods. After the field measurement of all survey stations is completed, perform unified indoor calculation on the combined re - measurement control network.

[0006] Further, the specific steps of step S1 are as follows: S11. Identify the number N of available GNSS receivers, and obtain the preset first receiver number threshold N1, second receiver number threshold N2, and third receiver number threshold N3, where N1 > N2 > N3; When N ≥ N1, proceed to step S12; When N3 ≤ N ≤ N2, proceed to step S13; S12. Determine to conduct a combined resurvey of the CPI control network, CPII control network, and encrypted control network, and proceed to step S2; S13. Determine to conduct a separate resurvey of the CPI control network, and conduct a combined resurvey of the CPII control network and the encrypted control network.

[0007] Furthermore, the specific steps of step S2 are as follows: S21. Identify the combined resurvey method; When it is a combined resurvey of three networks, proceed to step S22; When it is a combined resurvey of two networks, proceed to step S23; S22. Arrange the control points in the CPI control network, CPII control network, and encrypted control network in a cycle from the start point to the end point of the line. After each station arrangement is completed, use two observation periods for field measurement. After the field measurement of the entire cycle is completed, conduct unified indoor calculation for the CPI control network, CPII control network, and encrypted control network, and end; S23. Arrange the control points of the CPI control network separately from the start point to the end point of the line for the first cycle of station arrangement, field measurement, and indoor calculation; S24. Arrange the control points in the CPII control network and the encrypted control network in a second cycle from the start point to the end point of the line. After each station arrangement in the second cycle is completed, use two observation periods for field measurement. After the field measurement of the second cycle is completed, conduct unified indoor calculation for the CPII control network and the encrypted control network.

[0008] Furthermore, the specific steps of step S24 are as follows: S241. Select the number m1 of encrypted control points for one station arrangement; If m1 is odd, proceed to step S242; If m1 is even, proceed to step S243; S242. Select one encrypted point as the common point for the CPI control point or the CPII control point for connection, and set m1 = m1 - 1; S243. Determine the number m2 of CPI control points and the number m3 of CPII control points for one station arrangement according to the number N of GNSS receivers and the number m1 of encrypted control points; Among them, ; S244. Take one end of the line as the starting point and the starting point as the current point; S245. Starting from the current point, deploy GNSS receivers at the first m2 CPI control points, the first m3 CPII control points, and the first encrypted control points; S246. Start field measurement, and during the first observation period, observe the measurement data of the m2 CPI control points, the m3 CPII control points, and the first encrypted control points arranged at the current station, and deploy GNSS receivers at the last encrypted control points, and during the second observation period, observe the measurement data of the m2 CPI control points, the m3 CPII control points, and the last encrypted control points arranged at the current station; S247. Determine whether the line has been arranged to the end point; If yes, go to step S248; If no, take the last two or three CPI control points / CPII control points in the previous period as the overlapping common points, determine the current point of the line, continue with the station layout, and return to step S245; S248. Perform in - house calculations on the data of the two observation periods in each station layout.

[0009] Furthermore, the specific steps of step S246 are as follows: S2461. Determine the effective observation time t1 of the CPI control points and the CPII control points, and the effective observation time t2 of the encrypted control points, where t2 < t1 and t1 is less than or equal to the total duration of the first observation period; S2462. Start field measurement. During the first observation period, observe the m2 CPI control points and the m3 CPII control points arranged at the current station according to t1, and observe the measurement data of the first encrypted control points according to t2; S2463. During the time period from t2 to t1 after the encrypted control points are observed, move the GNSS receivers deployed at the first encrypted control points to the last encrypted control points; S2464. After the first observation period, during the second observation period, observe the m2 CPI control points and the m3 CPII control points arranged at the current station according to t1, and observe the measurement data of the last encrypted control points according to t2.

[0010] Furthermore, the specific steps of step S247 are as follows: S2471. During the time period from t2 to t1 after the encrypted control points are observed, determine whether the line layout has reached the end point; If so, proceed to step S248; If not, proceed to step S2472; S2472. After turning off the GNSS receivers of the subsequent encrypted control points, relocate to the previous encrypted control points for the next survey station layout; S2473. Determine whether the second observation period of the current survey station layout has been completed; If so, proceed to step S2475; If not, proceed to step S2474; S2474. Wait for the set time period and return to step S2473; S2475. After turning off the GNSS receivers deployed at the current m2 CPI control points and m3 CPII control points, relocate to the m2 CPI control points and m3 CPII control points of the next survey station layout, and return to step S246.

[0011] Further, the specific steps of step S248 are as follows: S2481. Take the data of the first observation period in each survey station layout as the first data, and the data of the second observation period as the second data; S2482. Import the first data, delete the observation data of the encrypted control points by screening the point numbers, perform baseline solution of the CPII control network and then perform adjustment calculation; S2483. Determine whether there are any observed values and adjusted values in the coordinates of the CPII control points that are greater than the set threshold or the accuracy of adjacent CPII control points is less than the set ratio; If there is at least one item, identify the out-of-limit points in the CPII control points and proceed to step S2484; If none of them exist, proceed to step S2485; S2484. Import the second data, delete the observation data of the encrypted control points by screening the point numbers, perform local baseline solution for the CPII control points within the set range around the out-of-limit points, and then perform adjustment calculation for the out-of-limit points; S2485. Import the first data and the second data, and screen out the observation data of the encrypted control points by screening the point numbers. After performing baseline solution on the two sets of observation data, perform adjustment calculation for the encrypted control points.

[0012] Second, the embodiments of the present application also provide a GNSS plane resurvey system, including: A remeasurement method determination module, configured to determine a combined remeasurement method for a CPI control network, a CPII control network, and an encrypted control network according to the number of GNSS receivers; A remeasurement execution module, configured to arrange survey stations starting from the starting point of the line according to the determined combined remeasurement method until reaching the end point of the line, and perform field measurements according to the determined number of observation periods after each survey station is arranged, and perform unified indoor calculations on the combined remeasured control network after the field measurements of all survey stations are completed.

[0013] Thirdly, an embodiment of the present application further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the program, the steps of the GNSS plane remeasurement method described in the first aspect are implemented.

[0014] Fourthly, an embodiment of the present application further provides a storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the GNSS plane remeasurement method described in the first aspect are implemented.

[0015] It can be seen from the above technical solutions that the present invention has the following advantages: In the GNSS plane remeasurement method, system, device, and medium provided by the present application, the number of remeasurement times is reduced, the remeasurement period is shortened, the workload of repeated measurement and secondary review is reduced, and the safety and operation quality of high-speed railways are guaranteed. The present invention combines the CPII control network and the encrypted control network with the most onerous GNSS plane remeasurement tasks through combined remeasurement of two networks, improves the remeasurement efficiency, reduces repeated measurement, and ensures that all accuracy indicators meet the specification requirements. The survey station layout form of the combined remeasurement of two networks in the present invention has two sets of CPII control network data, solves the link of needing to perform secondary remeasurement on CPII overlimit points, and when the CPII data of one observation period is unqualified, the data of another observation period can be used for calculation, increasing the qualified rate of the data. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the present invention, the drawings required to be used in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic flowchart of an embodiment of the GNSS plane remeasurement method of the present invention.

[0018] Figure 2 It is a schematic flowchart of another embodiment of the GNSS plane remeasurement method of the present invention.

[0019] Figure 3 This is a schematic diagram of the GNSS plane re-surveying system of the present invention. Specific embodiments

[0020] In the following detailed description of the specific steps of the GNSS plane re-surveying method, various embodiments of the present disclosure will be more comprehensively described. The present disclosure can have various embodiments, and adjustments and changes can be made therein. However, it should be understood that there is no intention to limit the various embodiments of the present disclosure to the specific embodiments disclosed herein, but the present disclosure should be understood to cover all adjustments, equivalents, and / or alternative options falling within the spirit and scope of the various embodiments of the present disclosure.

[0021] In the following embodiments, the noun explanations involved are as follows: CPI, short for Control Point I, is the control point of the basic plane control network and is the first-level control point in high-speed railway construction. The CPI control network is the most basic control network in high-speed railway construction and provides a benchmark for the subsequent CPII control network and encrypted control network.

[0022] CPII, short for Control Point II, is the control point of the line plane control network and is the second-level control point in high-speed railway construction. The CPII control network is established on the basis of the CPI control network and is used to control the direction and position of high-speed railway lines.

[0023] The encrypted control network belongs to the construction control network and is the third-level control network in high-speed railway construction. The encrypted control network is a denser control network established on the basis of the CPII control network to meet the construction accuracy requirements.

[0024] Exemplarily, with the booming expansion of high-speed railway construction, the number of projects has increased sharply, which has set more stringent standards for the construction and re-surveying of the precise measurement network and the encrypted network. As the cornerstone of the construction accuracy of high-speed railways, the accuracy and stability of the precise measurement network and the encrypted network are crucial for ensuring the safe operation and quality of high-speed railways.

[0025] According to the relevant measurement specifications of high-speed railway projects, the CPII control network should be attached to the CPI, the encrypted network should be attached to the CPII or CPI control points, and fixed data adjustment should be adopted. When conducting traditional plane re-surveying, the measurement is generally carried out in the order of hierarchical measurement and step-by-step control. The first step is to re-survey the second-class CPI control network, and the re-surveyed points are only the CPI control points; the second step is to re-survey the third-class CPII control network, and the re-surveyed points are the CPI and CPII control points; the third step is to re-survey the fourth-class encrypted control network, and the re-surveyed points are the CPI, CPII, and encrypted control points.

[0026] In the traditional GNSS plane re-survey method, it is necessary to measure from the starting point to the end point of the line three times. The CPI control points need to be measured three times, the CPII control points need to be measured twice, and the encrypted control points need to be measured once. The CPI and CPII control points are set up stations repeatedly, resulting in a long re-survey cycle. Moreover, after adjustment processing, if the point position difference and the accuracy of adjacent points exceed the limit, according to the specification, a second review is required.

[0027] In view of the above problems, this embodiment provides a GNSS plane re-survey method, which reduces the number of re-survey times, shortens the re-survey cycle, reduces the workload of repeated measurement and secondary review, and provides guarantee for the safety and operation quality of high-speed railways.

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figure 1 The flowchart of the GNSS plane re-survey method in a specific embodiment is shown. The method includes the following steps: S1. Determine the combined re-survey method of the CPI control network, CPII control network and encrypted control network according to the number of GNSS receivers; It should be noted that determining the combined re-survey method according to the number of GNSS receivers improves the flexibility and adaptability of measurement and avoids resource waste; S2. Arrange survey stations from the starting point of the line according to the determined combined re-survey method until reaching the end point of the line. After each survey station is arranged, conduct field measurement according to the determined number of observation periods, and after the field measurement of all survey stations is completed, conduct unified indoor calculation on the combined re-survey control network; It should be noted that the arrangement of survey stations and the arrangement of observation periods are optimized to ensure the continuity and accuracy of measurement and shorten the re-survey cycle.

[0030] In this embodiment, by flexibly determining the combined re-survey method of the CPI control network, CPII control network and encrypted control network according to the number of GNSS receivers, and optimizing the arrangement of survey stations and the arrangement of observation periods, the re-survey efficiency and accuracy of the high-precision network and encrypted network of high-speed railways are improved.

[0031] Furthermore, as a refinement and extension of the specific implementation manner of the above embodiment, in order to completely illustrate the specific implementation process in this embodiment, as Figure 2 shown, another GNSS plane re-survey method is provided. The method includes the following steps: S1. Determine the combined re-survey method for the CPI control network, CPII control network, and encrypted control network based on the number of GNSS receivers. The specific steps of step S1 are as follows: S11. Identify the number of available GNSS receivers N, and obtain the preset first receiver number threshold N1, second receiver number threshold N2, and third receiver number threshold N3, and N1 > N2 > N3; When N ≥ N1, proceed to step S12; When N3 ≤ N ≤ N2, proceed to step S13; S12. Determine to conduct a combined re-survey of the CPI control network, CPII control network, and encrypted control network, and proceed to step S2; S13. Determine to conduct a separate re-survey of the CPI control network, and conduct a combined re-survey of the CPII control network and the encrypted control network; It should be noted that generally 8 - 10 GNSS receivers are used for GNSS plane re-survey. If there are more than 14 GNSS receivers, the CPI, CPII, and encrypted control networks can be combined for re-survey. Due to the restriction of the number of instruments and considering the operability of implementation, when using about 10 GNSS receivers, only combining the CPII network and the encrypted control network has higher measurement efficiency and stronger practical operability. Thus, N1 can be taken as 14, N2 can be taken as 11, and N3 can be taken as 9; The specific process of judging the combined re-survey method based on the GNSS receiver number threshold provides a basis for optimizing the measurement process; S2. Arrange survey stations starting from the line start point according to the determined combined re-survey method until reaching the line end point. After each survey station arrangement is completed, conduct field measurements according to the determined number of observation periods. After all field measurements of the survey stations are completed, conduct unified indoor calculations for the combined re-survey control network. The specific steps of step S2 are as follows: S21. Identify the combined re-survey method; When it is a combined re-survey of three networks, proceed to step S22; When it is a combined re-survey of two networks, proceed to step S23; S22. Arrange survey stations for the control points in the CPI control network, CPII control network, and encrypted control network in a cycle from the line start point to the line end point. After each survey station arrangement is completed, use two observation periods for field measurements. After all field measurements of the cycle are completed, conduct unified indoor calculations for the CPI control network, CPII control network, and encrypted control network, and end; S23. Arrange survey stations, conduct field measurements, and conduct indoor calculations for the control points of the CPI control network separately in the first cycle from the line start point to the line end point; S24. Arrange the control points in the CPII control network and the encrypted control network from the starting point of the line to the end point of the line for the second cycle of measurement stations, and after each measurement station arrangement of the second cycle is completed, use two observation periods to perform field measurements, and after the second cycle of field measurements is completed, perform unified internal calculations on the CPII control network and the encrypted control network; It should be noted that the continuity and accuracy of the measurement are ensured by merging or partially merging the control networks of various levels. In the re-measurement of the two networks, the CPI control network is still re-measured separately, and the CPII control network is re-measured together with the encrypted control network. The CPI and CPII control points in the CPII control network are observed for two time periods, and 1 / 2 of the encrypted points within the re-measurement range are measured in each time period. During the observation, the encrypted points are shut down earlier than the CPI and CPII due to the short effective time period, and then moved to the encrypted points to be measured in the next time period. During the internal calculation, the CPI control network is independently processed for baseline and adjusted; the CPI and CPII in the CPII control network are observed in two periods and need to be divided into two parts, one as the data of the CPII control network and the other as the data for the secondary verification of the over-limit points. During the internal calculation of the CPII control network data, the encrypted points are first removed before the baseline processing and adjustment calculation are performed; the data of the secondary re-measurement is also removed after the encrypted points are removed before the local baseline processing and adjustment calculation are performed on the over-limit points. The encrypted control network merges the data of the two periods, retains all the control point data, and then performs baseline processing and adjustment calculation.

[0032] In an embodiment of the present invention, based on step S24, a possible embodiment is given below to illustrate its specific implementation in a non-limiting manner.

[0033] The specific steps of step S24 are as follows: S241. Select the number of encrypted control points m1 for a station layout; If m1 is an odd number, go to step S242; If m1 is an even number, go to step S243; S242. Select an encrypted point as the common point of the CPI control point or the CPII control point for overlap, and set m1=m1-1; S243. Determine the number of CPI control points m2 and the number of CPII control points m3 of a station arrangement according to the number of GNSS receivers N and the number of encrypted control points m1; in, ; S244. Take one end of the line as the starting point and the starting point as the current point; S245. Starting from the current point, the first m2 CPI control points, the first m3 CPII control points and the first Deploy GNSS receivers at encrypted control points; S246. Start field measurement, and during the first observation period, observe the measurement data of m2 CPI control points, m3 CPII control points, and the previous encrypted control points arranged at the current station, and deploy GNSS receivers at the subsequent encrypted control points, and during the second observation period, observe the measurement data of m2 CPI control points, m3 CPII control points, and the subsequent encrypted control points arranged at the current station; S247. Determine whether the line layout reaches the end point; If yes, proceed to step S248; If not, use the last two or three CPI control points / CPII control points in the previous period as overlapping common points to determine the current point of the line, continue with the station layout, and return to step S245; S248. Perform indoor calculations on the data of the two observation periods in each station layout; It should be noted that during the resurvey of the two-network merger, the station layout is optimized according to the parity of the number of encrypted control points, reducing the number of station relocations and improving the measurement efficiency.

[0034] In an embodiment of the present invention, based on step S246, step S247, and step S248, a possible embodiment will be given below to non-restrictively elaborate on its specific implementation.

[0035] The specific steps of step S246 are as follows: S2461. Determine the effective observation time t1 of CPI control points and CPII control points, and the effective observation time t2 of encrypted control points, where t2 < t1, and t1 is less than or equal to the total duration of the first observation period; S2462. Start field measurement. During the first observation period, observe m2 CPI control points and m3 CPII control points arranged at the current station according to t1, and observe the measurement data of the previous encrypted control points according to t2; S2463. Within the time period from t2 to t1 after the encrypted control points are observed, relocate the GNSS receivers deployed at the previous encrypted control points to the subsequent encrypted control points; S2464. After the first observation period, during the second observation period, observe m2 CPI control points and m3 CPII control points arranged at the current station according to t1, and observe the measurement data of the subsequent encrypted control points according to t2; The specific steps of step S247 are as follows: S2471. During the time period from t2 to t1 after the encrypted control points are observed, determine whether the line layout has reached the end point; If so, proceed to step S248; If not, proceed to step S2472; S2472. After turning off the GNSS receivers of the subsequent encrypted control points, relocate to the previous encrypted control points for the next survey station layout; S2473. Determine whether the second observation period of the current survey station layout has been completed; If so, proceed to step S2475; If not, proceed to step S2474; S2474. Wait for the set time period and return to step S2473; S2475. After turning off the GNSS receivers of the current m2 CPI control points and m3 CPII control points, relocate to the m2 CPI control points and m3 CPII control points of the next survey station layout, and return to step S246; Specifically, according to the relevant specifications of high-speed railway engineering survey, the effective period length of the CPI control network (second-class network) ≥ 90 min and the number of periods is not less than 2, the effective period length of the CPII control network (third-class network) ≥ 60 min, and the effective period length of the encrypted control network (fourth-class network) ≥ 45 min. To ensure the effective period length, the observation time of CPII control points is set to 70 min, and the observation time of encrypted control points is set to 50 min; Specifically, after the GNSS receivers are placed at the control points, turn them on simultaneously. The CPI control points and CPII control points are observed for 70 min, and the encrypted points are observed for 50 min; when the observation time of the encrypted points meets 50 min, turn off the instruments and relocate to the encrypted points to be measured in the second period. At this time, the CPI control points and CPII control points remain stationary; when the observation time of the CPI control points and CPII control points meets 70 min, turn off the CPI control points and CPII control points. At this time, the encrypted points in the second observation period are basically in place, and all CPI control points, CPII control points, and encrypted control points are turned on for the observation of the second observation period; After completing the observation of the second observation period, except for the overlapping common points, other control points are relocated; the encrypted control points can be relocated to the next encrypted control point after meeting the 50-min observation time, and the CPI control points and CPII control points are relocated after meeting the 70-min observation time; during relocation, the encrypted control points that are turned off earlier are relocated to the farther encrypted control points, and the CPI control points and CPII control points that are turned off later are relocated to the nearer control points; It should be noted that by optimizing the observation period arrangement of encrypted control points and effectively utilizing the observation time, the quality and reliability of the measurement data are improved; The specific steps of step S248 are as follows: S2481. The data of the first observation period in each station arrangement is used as the first data, and the data of the second observation period is used as the second data; S2482. Import the first data, delete the observation data of the encrypted control point by screening the point number, and perform the adjustment calculation after the baseline solution of the CPII control network; S2483. Determine whether there is an observation value and an adjustment value greater than a set threshold value in the CPII control point coordinates or the accuracy of adjacent CPII control points is less than a set ratio; If at least one item exists, identify the over-limit point in the CPII control point and proceed to step S2484; If none of them exist, go to step S2485; S2484. import the second data, delete the observation data of the encrypted control point by screening the point number, solve the local baseline of the CPII control point within the setting range around the over-limit point, and then adjust the over-limit point; S2485. Import the first data and the second data, and filter out the observation data of the encrypted control points by screening the point number, and after the two observation data are baseline solved, the adjustment calculation of the encrypted control points is performed; It should be noted that the accuracy of the measurement results is ensured and the workload of secondary review is reduced through baseline solution and adjustment calculation based on observation data; For example, after the CPII control network constraint adjustment, if the coordinate difference of some CPII control points is greater than 15mm or the accuracy of adjacent points is less than 1 / 80000, a second re-survey should be carried out in accordance with relevant specifications.

[0036] In an embodiment of the present invention, based on step S22, a possible embodiment is given below to illustrate its specific implementation scheme in a non-limiting manner.

[0037] The specific steps of step S22 are as follows: S221. Select the number of encrypted control points m1 for a station layout; If m1 is an odd number, go to step S222; If m1 is an even number, go to step S223; S222. Select an encrypted point as the common point of the CPI control point or the CPII control point for overlap, and set m1=m1-1; S223. Determine the number m1 of encrypted control points, the number m2 of CPI control points, and the number m3 of CPII control points for a single station layout according to the number N of GNSS receivers; Among them, ; S224. Take one end of the line as the starting point and use the starting point as the current point; S225. Start from the current point and deploy GNSS receivers at the first m2 CPI control points, the first m3 CPII control points, and the first encrypted control points; S226. Start the field measurement, and during the first observation period, observe the measurement data of the m2 CPI control points, the m3 CPII control points, and the first encrypted control points arranged at the current station layout, and deploy GNSS receivers at the subsequent encrypted control points, and during the second observation period, observe the measurement data of the m2 CPI control points, the m3 CPII control points, and the subsequent encrypted control points arranged at the current station layout; S227. Determine whether the line layout has reached the end point; If so, go to step S228; If not, use the last two or three CPI control points / CPII control points in the previous period as the overlapping common points, determine the current point of the line, continue the station layout, and return to step S225; S228. Perform in - house calculations on the data of the two observation periods in each station layout.

[0038] In an embodiment of the present invention, based on steps S226, S227, and S228, a possible embodiment will be given below to non - restrictively elaborate on its specific implementation plan.

[0039] The specific steps of step S226 are as follows: S2261. Determine the effective observation time t1 of the CPI control points, the effective observation time t2 of the CPII control points, and the effective observation time t3 of the encrypted control points, where t3 < t2 < t1, and t1 is less than or equal to the total duration of the first observation period; S2262. Start the field measurement. During the first observation period, observe the m2 CPI control points arranged at the current station layout according to t1, observe the m3 CPII control points according to t2, and observe the measurement data of the first encrypted control points according to t3; S2263. During the time period from t3 to t2 after the encrypted control points are observed, move the GNSS receivers deployed at the first encrypted control points to the subsequent encrypted control points; After the effective observation time t2 of m3 CPII control points is completed, wait for the effective observation time t1 of CPI control points to be completed; After the first observation period is completed, in the second observation period, observe m2 CPI control points arranged at the current measuring station according to t1, observe m3 CPII control points according to t2, and observe the measurement data of the subsequent encrypted control points according to t3; The specific steps of step S227 are as follows: S2271. Within the time period between t3 and t2 after the encrypted control points are observed, determine whether the line layout reaches the end point; If so, go to step S228; If not, go to step S2272; S2272. After turning off the GNSS receivers of the subsequent encrypted control points, relocate to the previous encrypted control points arranged at the next measuring station; S2273. Within the time period between t2 and t1 after the CPII control points are observed, turn off the GNSS receivers of m3 CPII control points and relocate to m3 CPII control points in the next measuring station step; S2274. Determine whether the second observation period arranged at the current measuring station is completed; If so, go to step S2276; If not, go to step S2275; S2275. Wait for the set time period and return to step S2274; S2276. After turning off the GNSS receivers arranged at the current m2 CPI control points, relocate to m2 CPI control points arranged at the next measuring station, and return to step S226; Specifically, according to the relevant specifications of high-speed railway engineering survey, the effective period length of the CPI control network (second-class network) ≥ 90 min and the number of periods is not less than 2, the effective period length of the CPII control network (third-class network) ≥ 60 min, and the effective period length of the encrypted control network (fourth-class network) ≥ 45 min. To ensure the effective period length, the observation time of CPII control points is set to 70 min, and the observation time of encrypted control points; is set to 50 min; Specifically, when integrating the three networks, after the instrument is placed at the control point, turn on all devices simultaneously. The CPI control points are observed for 100 minutes, the CPII control points are observed for 70 minutes, and the encrypted points are observed for 50 minutes. When the observation time of the encrypted points reaches 50 minutes, turn off the GNSS receiver and move it to the encrypted points to be measured in the second period. At this time, the CPI control points and CPII control points remain stationary. When the observation time of the CPI control points reaches 100 minutes and the observation time of the CPII control points reaches 70 minutes, turn off the CPI control points and CPII control points. At this time, the encrypted points in the second period are basically in place, and all CPI control points, CPII control points, and encrypted control points are turned on for observation in the second observation period. After completing the observation in the second observation period, except for the overlapping CPI common points, other control points are relocated. The CPII control points can be relocated to the next station after 70 minutes of observation, and the encrypted points can be relocated after 50 minutes of observation. The CPI control points are relocated after 100 minutes of observation. When relocating, the encrypted control points that were turned off earlier are moved to the more distant control points, and the CPI control points and CPII control points that were turned off later are moved to the closer control points. The specific steps of step S228 are as follows: S2281. Take the data of the first observation period in each station layout as the first data, and the data of the second observation period as the second data. S2282. Import the first data and the second data, delete the observation data of the encrypted control points and CPII control points by screening the point numbers, perform baseline solution of the CPI control network and then perform adjustment calculation. S2283. Import the second data, delete the observation data of the encrypted control points by screening the point numbers, perform baseline solution of the CPII control network and then perform adjustment calculation. S2284. Determine whether there is an observed value in the coordinates of the CPII control points that is greater than the set threshold compared to the adjusted value, or whether the accuracy of adjacent CPII control points is less than the set ratio. If there is at least one item, identify the out-of-limit points in the CPII control points and enter step S2285. If none of them exist, enter step S2286. S2285. Import the second data, delete the observation data of the encrypted control points by screening the point numbers, perform local baseline solution for the CPII control points within a set range around the out-of-limit points, and then perform adjustment calculation for the out-of-limit points. S2286. Import the first data and the second data, screen out the observation data of the encrypted control points by screening the point numbers, perform baseline solution for the two sets of observation data, and then perform adjustment calculation for the encrypted control points.

[0040] It should be noted that through data processing during the remeasurement of the three-network merger, the observation data was merged and divided, improving the accuracy and reliability of the measurement results.

[0041] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not imply the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0042] As Figure 3 shown, the following are embodiments of the GNSS plane remeasurement system provided by the embodiments of the present disclosure. This system and the GNSS plane remeasurement methods of the above embodiments belong to the same inventive concept. For the details not described in detail in the embodiments of the GNSS plane remeasurement system, reference can be made to the embodiments of the above GNSS plane remeasurement methods.

[0043] The system includes: A remeasurement method determination module, configured to determine the combined remeasurement methods for the CPI control network, CPII control network, and encrypted control network according to the number of GNSS receivers; A remeasurement execution module, configured to arrange survey stations starting from the starting point of the line according to the determined combined remeasurement method until reaching the end point of the line, and perform field measurements according to the determined number of observation periods after each survey station is arranged. After the field measurements of all survey stations are completed, unified indoor calculations are performed on the combined remeasurement control network.

[0044] The GNSS plane remeasurement method provided by the embodiments of the present application can be applied to an electronic device. Those skilled in the art can understand that the structure of the electronic device involved in the embodiments of the present invention does not constitute a limitation to the electronic device. The electronic device may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements. In the embodiments of the present invention, the electronic device includes, but is not limited to, a laptop computer, a desktop computer, a workbench, a personal digital assistant, a server, a blade server, a mainframe computer, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as, a personal digital processor, a cellular phone, a smart phone, a wearable device, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the embodiments of the present application described herein and / or claimed.

[0045] The electronic device may include a processor, an external memory interface, an internal memory, a universal serial bus (USB) interface, a charging management module, a power management module, a battery, a wireless communication module, an audio module, a speaker, a microphone, a sensor module, a key, a camera, a display screen, and a SIM card interface, etc.

[0046] It can be understood that the structure illustrated in the embodiments of the present application does not constitute a specific limitation on the electronic device. In other embodiments of the present application, the electronic device may include more or fewer components than those illustrated, or combine certain components, or split certain components, or have different component arrangements. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0047] The processor may include one or more processing units. For example, the processor may include a central processing unit (CPU), an application processor (AP), a modem processor, a graphics processing unit (GPU), an image signal processor (ISP), a controller, a memory, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Among them, different processing units may be independent devices or integrated in one or more processors.

[0048] Among them, the processor may be the nerve center and command center of the electronic device. The controller may generate operation control signals according to the instruction operation code and timing signals to complete the control of fetching and executing instructions.

[0049] A memory may also be provided in the processor for storing instructions and data. In some embodiments, the memory in the processor is a cache memory. This memory may save the instructions or data that the processor has just used or recycled. If the processor needs to use the instruction or data again, it can be directly called from this memory. This avoids repeated accesses, reduces the waiting time of the processor, and thus improves the system efficiency.

[0050] The above-mentioned electronic device implements the technical solution of the GNSS plane re-survey method of the present application, which determines the combined re-survey method of the CPI control network, CPII control network, and encrypted control network according to the number of GNSS receivers; arranges survey stations starting from the starting point of the line until reaching the end point of the line according to the determined combined re-survey method, and performs field measurements according to the determined number of observation periods after each survey station is arranged, and after the field measurements of all survey stations are completed, performs unified indoor calculations on the combined re-survey control network. This achieves the beneficial effect of combining the measurement of the CPII control network and the encrypted control network, which are the most laborious in the GNSS plane re-survey task, improves the efficiency of the re-survey, reduces repeated measurements, and ensures that all accuracy indicators meet the specification requirements.

[0051] In the storage medium provided by this application, there is a program product capable of implementing the GNSS plane re-survey method.

[0052] The GNSS plane re-survey method includes: determining the combined re-survey method for the CPI control network, CPII control network, and encrypted control network according to the number of GNSS receivers; arranging survey stations starting from the line start point according to the determined combined re-survey method until reaching the line end point, and performing field measurements according to the determined number of observation periods after each survey station is arranged, and after the field measurements of all survey stations are completed, performing unified indoor calculations on the combined re-survey control network.

[0053] In some possible implementation manners, the GNSS plane re-survey method of the present disclosure can be implemented in the form of a program product, which includes program code. When the program product runs on a terminal device, the program code is used to cause the terminal device to execute the steps according to various exemplary embodiments of the present disclosure described in the above "Exemplary Method" section of this specification.

[0054] The storage medium of the present disclosure can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the above. More specific examples (non-exhaustive list) of the readable storage medium include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0055] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A GNSS plane re-survey method, characterized in that: The steps include: S1. Determine the combined re-survey method of the CPI control network, CPII control network and encrypted control network according to the number of GNSS receivers; S2. Arrange measuring stations from the starting point of the line according to the determined combined re-survey method until the end of the line is reached, and carry out field measurements according to the determined number of observation periods after each arrangement of measuring stations is completed. After the field measurements of all measuring stations are completed, perform unified internal calculations on the combined re-survey control network.

2. The GNSS plane re-survey method according to claim 1, characterized in that: The specific steps of step S1 are as follows: S11. Identify the number of available GNSS receivers N, and obtain a preset first receiver number threshold N1, a second receiver number threshold N2, and a third receiver number threshold N3, and N1>N2>N3; When N≥N1, go to step S12; When N3≤N≤N2, go to step S13; S12. Determine the CPI control network, CPII control network and encryption control network for three-network merger retest, and proceed to step S2; S13. Determine that the CPI control network is retested separately, and combine the CPII control network and the encryption control network for retesting.

3. The GNSS plane re-survey method according to claim 2, characterized in that: The specific steps of step S2 are as follows: S21. Identify the combined retest method; When it is a three-network merger retest, go to step S22; When the two networks are combined for retest, go to step S23; S22. Arrange the control points in the CPI control network, CPII control network and encrypted control network in a cycle from the starting point of the line to the end point of the line, and after each station arrangement is completed, use two observation periods to perform field measurements, and after the field measurements of the entire cycle are completed, perform unified internal calculations on the CPI control network, CPII control network and encrypted control network, and end; S23. Arrange the control points of the CPI control network from the starting point of the line to the end point of the line for the first cycle of station arrangement, field measurement and indoor calculation; S24. Arrange the control points in the CPII control network and the encrypted control network for the second cycle from the starting point of the line to the end point of the line, and after each station arrangement of the second cycle is completed, use two observation periods to perform field measurements, and after the second cycle of field measurements is completed, perform unified internal calculations on the CPII control network and the encrypted control network.

4. The GNSS plane re-survey method according to claim 3, characterized in that: The specific steps of step S24 are as follows: S241. Select the number of encrypted control points m1 for a station layout; If m1 is an odd number, go to step S242; If m1 is an even number, go to step S243; S242. Select an encrypted point as the common point of the CPI control point or the CPII control point for overlap, and set m1=m1-1; S243. Determine the number of CPI control points m2 and the number of CPII control points m3 of a station arrangement according to the number of GNSS receivers N and the number of encrypted control points m1; in, ; S244. Take one end of the line as the starting point and the starting point as the current point; S245. Starting from the current point, the first m2 CPI control points, the first m3 CPII control points and the first Deploy GNSS receivers at encrypted control points; S246. Start field measurement and observe the m2 CPI control points, m3 CPII control points and the previous control points arranged at the current station in the first observation period. The measurement data of the encrypted control points, and the In the second observation period, the GNSS receivers are deployed at the encrypted control points, and the m2 CPI control points, m3 CPII control points and the subsequent Measurement data of encrypted control points; S247. Determine whether the route is arranged to the end point; If yes, go to step S248; If not, use the last two or three CPI control points / CPII control points in the previous time period as the overlapping common points, determine the current point of the line, continue with the survey station layout, and return to step S245; S248. Perform in-office calculations on the data of two observation time periods in each survey station layout.

5. The GNSS plane re-survey method according to claim 4, characterized in that: The specific steps of step S246 are as follows: S2461. Determine the effective observation time t1 of the CPI control points and CPII control points, and the effective observation time t2 of the encrypted control points, where t2 < t1 and t1 is less than or equal to the total duration of the first observation time period; S2462. Start field measurement. In the first observation period, observe the m2 CPI control points and m3 CPII control points arranged at the current station according to t1, and observe the previous Measurement data of encrypted control points; S2463. After the encrypted control point is observed, in the period between t2 and t1, After the GNSS receivers deployed at the encrypted control points are migrated to Encryption control points; S2464. After the first observation period is completed, in the second observation period, observe the m2 CPI control points and m3 CPII control points arranged at the current observation station according to t1, and observe the m2 CPI control points and m3 CPII control points arranged at the current observation station according to t2. The measurement data of the encrypted control points.

6. According to the GNSS plane resurvey method described in claim 4, characterized in that the specific steps of step S247 are as follows: The specific steps of step S247 are as follows: S2471. Within the time period from t2 to t1 after the encrypted control points are observed, determine whether the line layout reaches the end point; If so, go to step S248; If not, go to step S2472; S2472. After After the GNSS receiver of the encrypted control point is turned off, the station is moved to the front of the next station layout. Encryption control points; S2473. Determine whether the observation of the second observation time period in the current survey station layout is completed; If so, go to step S2475; If not, go to step S2474; S2474. Wait for the set time period and return to step S2473; S2475. After turning off the GNSS receivers deployed at the current m2 CPI control points and m3 CPII control points, relocate them to the m2 CPI control points and m3 CPII control points of the next survey station layout, and return to step S246.

7. The GNSS plane re-survey method according to claim 5, characterized in that: The specific steps of step S248 are as follows: S2481. Use the data of the first observation time period in each survey station layout as the first data, and the data of the second observation time period as the second data; S2482. Import the first data, delete the observation data of the encrypted control points by screening the point numbers, perform baseline solution of the CPII control network and then perform adjustment calculation; S2483. Determine whether there are any observed values and adjusted values in the coordinates of the CPII control points that are greater than the set threshold or the accuracy of adjacent CPII control points is less than the set ratio; If there is at least one item, identify the out-of-limit points in the CPII control points and go to step S2484; If none of them exist, go to step S2485; S2484. Import the second data, delete the observation data of the encrypted control points by screening the point numbers, perform local baseline solution on the CPII control points within the set range around the out-of-limit points, and then perform adjustment calculation on the out-of-limit points; S2485. Import the first data and the second data, and screen out the observation data of the encrypted control points by screening the point numbers. After performing baseline solution on the two sets of observation data, perform adjustment calculation of the encrypted control points.

8. A GNSS plane re-survey system, characterized in that: Including: A resurvey method determination module for determining the combined resurvey method of the CPI control network, CPII control network, and encrypted control network according to the number of GNSS receivers; A resurvey execution module for arranging survey stations starting from the starting point of the line according to the determined combined resurvey method until reaching the end point of the line, performing field measurements according to the determined number of observation time periods after each survey station layout is completed, and performing unified in-office calculations on the combined resurvey control network after the field measurements of all survey station layouts are completed.

9. An electronic device, characterized in that: The method comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the GNSS plane re-survey method according to any one of claims 1 to 8 when executing the program.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the GNSS plane re-survey method according to any one of claims 1 to 8 are implemented.

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