Gravity near-zone terrain correction method and device based on RTK continuous measurement method

Abstract

The present invention belongs to the field of gravity exploration technology and discloses a method for correcting near-zone gravity terrain based on RTK continuous measurement. The method comprises starting an RTK base station; determining the position of an actual gravity point; locating the actual gravity point; setting an RTK continuous measurement mode; performing RTK continuous terrain measurement; gridding near-zone terrain data; obtaining relative terrain elevation difference and inclination; calculating near-zone terrain corrections to obtain a near-zone terrain correction value for the actual gravity point; and adding the near-zone terrain correction value to the gravity measurement value to achieve near-zone gravity terrain correction. The present invention also discloses a correction device for the near-zone gravity terrain correction method based on RTK continuous measurement. The present invention is used for near-zone gravity terrain correction, can reduce the number of field workers, shorten the gravity exploration and acquisition cycle, and lower the gravity exploration and acquisition costs, resulting in significant economic benefits.

Description

Technical Field

[0001] The invention belongs to the technical field of gravity exploration, and relates to a method and device for correcting gravity near-zone terrain based on RTK continuous measurement. Background Art

[0002] Gravity exploration is one of the most fundamental geophysical exploration methods, with broad applications and important roles in geological surveys, energy resource exploration, engineering surveys, and other aspects of society. Its theoretical basis is the theory of universal gravitation, and gravity measurements include the gravitational contribution of all materials with mass.

[0003] Underground structures and geological bodies are the research targets of gravity exploration, while other mass materials that are not research targets are interference factors for gravity exploration and need to be eliminated or suppressed from gravity measurements. Undulating terrain is an interference factor for gravity exploration. It is unrelated to the geological exploration target and needs to be removed through terrain correction. Gravity terrain correction can be divided into two parts: near-zone terrain correction (a circular area with a radius of 20 meters or a square area with a half-side length of 20 meters centered on the gravity point) and mid-to-far zone terrain correction (the area outside the near-zone). Near-zone terrain correction is achieved by measuring the terrain fluctuations within the near-zone in the field and calculating the terrain correction value. Mid-to-far zone terrain correction is achieved by reading elevation from a topographic map or collecting digital terrain data and calculating the terrain correction value.

[0004] Currently, existing methods for correcting near-field terrain are based on field topography measurements using the circular and square methods. These methods then calculate terrain corrections and add them to the observed gravity values. The circular method estimates the elevation difference of terrain relative to the actual gravity point using three rings and eight directions within a range of 0 to 20 meters. This requires measuring the elevation differences of 24 terrain points in eight directions, spaced 45 degrees apart, along the three rings. The square method calculates the near-field terrain correction by measuring the elevation differences of eight terrain points, including the four corner points and the four side midpoints of a square centered at the actual gravity point and at a horizontal distance of 20 meters from half its side. Both the circular and square methods require elevation measurement of these terrain points. The existing method involves one person using a forest compass or similar device to determine eight directions. One or two other people then run a ruler in each of the eight directions to the approximate location at a specified distance. Multiple measurements and repeated adjustments are performed until the ruler reaches the desired terrain point. The ruler then measures the elevation difference of that point relative to the actual gravity point, and finally calculates the near-field terrain correction.

[0005] Existing near-zone terrain correction measurements require two to three personnel, requiring multiple measurements and repeated adjustments to ensure the runners reach the designed topographic points. In complex terrain, near-zone terrain correction for a single gravity point can take 20-30 minutes, far exceeding the 5-10 minutes required for gravity observations. Existing near-zone terrain correction methods require a large number of personnel and lengthy topographic measurement times, significantly reducing the efficiency of gravity data collection and increasing exploration costs. Therefore, a new gravity near-zone terrain correction method is urgently needed. Summary of the Invention

[0006] The purpose of the present invention is to provide a method for gravity near-zone terrain correction based on the RTK continuous measurement method. When the GNSS positioning instrument measurement mode is the RTK continuous measurement mode, the surveyor carries the GNSS positioning instrument and walks near various terrain correction points. The GNSS positioning instrument automatically and continuously records the coordinates and elevation of the terrain on the path. By gridding and interpolating the near-zone terrain data, the height difference and inclination angle of each designed terrain correction point relative to the actual gravity point are obtained. The terrain correction value is calculated according to the gravity near-zone terrain correction calculation formula and the observed gravity value is corrected to achieve gravity near-zone terrain correction.

[0007] Another object of the present invention is to provide a gravity near-zone terrain correction device based on RTK continuous measurement method.

[0008] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0009] A method for correcting near-region gravity terrain based on RTK continuous measurement method comprises the following steps:

[0010] Start the RTK base station device;

[0011] Determine the actual gravity point location and use a GNSS locator to measure the coordinates and elevation of the actual gravity point;

[0012] Set the GNSS locator to RTK continuous measurement mode and start RTK continuous measurement;

[0013] The GNSS positioner will automatically and continuously record the coordinates and elevation of the terrain along the terrain correction path while walking through the approximate locations of each designed terrain correction point.

[0014] Grid the coordinates and elevation of the terrain on the path to form the nearby terrain elevation grid data;

[0015] Interpolate the elevation of each designed terrain correction point from the nearby terrain elevation grid data, and calculate its height difference and inclination relative to the actual gravity point;

[0016] The near-area terrain correction value of the actual gravity point is calculated according to the gravity near-area terrain correction calculation formula and added to the gravity measurement value.

[0017] As a limitation, the RTK reference station equipment adopts a self-built RTK reference station or a network RTK reference station;

[0018] When using a self-built RTK base station, start the RTK base station device, including:

[0019] Set up GNSS positioning antennas at survey control points and measure antenna heights, and set up and connect RTK base station equipment;

[0020] Turn on the GNSS locator and enter the measurement control point coordinates, elevation and antenna height in the GNSS locator handbook;

[0021] Set the GNSS locator working mode to RTK base station mode and start RTK base station operation;

[0022] When a network RTK base station is used, the network RTK signal provider starts the RTK base station device and sends the network RTK signal.

[0023] As a second limitation, determining the actual gravity point position specifically includes:

[0024] According to the instructions of the topographic map and / or navigator, reach the approximate position of the designed gravity point and determine the actual gravity point position within the point offset tolerance.

[0025] As a further limitation, the measuring of the coordinates and elevation of the actual gravity point using a GNSS locator specifically includes:

[0026] Place the centering pole of the GNSS locator antenna on the actual gravity point and measure the height from the antenna to the actual gravity point.

[0027] Enter the antenna height of the point in the GNSS locator handbook and set the measurement mode to point measurement mode;

[0028] Use a GNSS locator to automatically measure and record the coordinates and elevation of the actual gravity point.

[0029] As a third limitation, setting the GNSS locator to RTK continuous measurement mode and starting RTK continuous measurement specifically includes:

[0030] Carry the GNSS locator antenna on your back and measure the height of the antenna after carrying it;

[0031] Enter the antenna height into the GNSS locator handbook and set the GNSS locator to RTK continuous measurement mode.

[0032] As a fourth limitation, the GNSS positioning device automatically and continuously records the coordinates and elevation of the terrain along the terrain correction path while sequentially walking through the approximate locations of the designed terrain correction points, specifically including:

[0033] Based on the coordinates of the actual gravity point and the requirements of the near-area terrain correction method, the coordinates of the design terrain correction points for each required measurement elevation are calculated and input into the GNSS positioning device;

[0034] Carrying the GNSS locator antenna, guided by the GNSS locator handbook, walk through the approximate locations of each designed terrain correction point in turn;

[0035] The coordinates and elevation of the terrain along the path are automatically and continuously recorded using a GNSS locator.

[0036] As a fifth limitation, the coordinates and elevation of the terrain on the path are gridded to form the near-area terrain elevation grid data, specifically including:

[0037] The GNSS locator automatically and continuously records the coordinates and elevation of the terrain on the path, and grids the data together with the coordinates and elevation of the actual gravity point to form the nearby terrain elevation grid data.

[0038] As a further limitation, the data is gridded, and the gridding range is the maximum near-area ground modification radius centered on the actual gravity point;

[0039] When using the circular method for near-area terrain correction, the grid spacing is less than or equal to the radius of the smallest ring in each terrain ring;

[0040] When using the square method for near-area terrain correction, the grid distance is less than or equal to half the length of the square side.

[0041] As a sixth limitation, the calculation of the near-area terrain correction value of the actual gravity point according to the gravity near-area terrain correction calculation formula and adding it to the gravity measurement value specifically includes:

[0042] Using the height difference or inclination of each designed terrain correction point relative to the actual gravity point, and following the gravity near-zone terrain correction calculation formula, calculate the terrain correction value corresponding to the terrain block represented by each designed terrain correction point;

[0043] Sum the terrain correction values ​​corresponding to each terrain block to obtain the terrain correction value near the actual gravity point;

[0044] Add the near-area terrain correction value to the gravity measurement value to achieve gravity near-area terrain correction.

[0045] On the other hand, the present invention also provides a correction device for the gravity near-zone terrain correction method based on the RTK continuous measurement method, comprising:

[0046] RTK base station equipment, used to receive GNSS satellite signals in real time, calculate and send differential signals to field mobile GNSS locators;

[0047] GNSS locator, used to measure the coordinates and elevation of the actual gravity point, and automatically and continuously record the coordinates and elevation of the terrain on the terrain correction path;

[0048] The data gridding module is used to grid the coordinates and elevation of the terrain on the path to form the nearby terrain elevation grid data;

[0049] The interpolation calculation processing module is used to interpolate the elevation of each designed terrain correction point from the terrain grid data and calculate its height difference and inclination relative to the actual gravity point;

[0050] The near-area terrain correction value determination module is used to calculate the near-area terrain correction value of the actual gravity point according to the gravity near-area terrain correction calculation formula, and add the near-area terrain correction value to the gravity measurement value to realize the gravity near-area terrain correction.

[0051] Due to the adoption of the above technical solution, the present invention has achieved the following technical advancements compared with the prior art:

[0052] (1) The present invention uses the RTK continuous measurement method to perform gravity near-area terrain correction, which can save 2-3 operators for each gravity group, reducing the direct investment of personnel and related logistics support costs;

[0053] (2) In complex terrain areas, the present invention can reduce the measurement time of near-area terrain correction for each actual gravity point from 20-30 minutes in conventional methods to about 10 minutes, thereby improving the efficiency of near-area terrain correction and gravity data collection in complex terrain areas;

[0054] (3) Compared with the existing technology, the present invention does not require single-point measurement and does not require strict adherence to each designed terrain correction point, which greatly improves the efficiency of gravity data collection.

[0055] (4) The present invention can improve the efficiency of gravity exploration operations, shorten the gravity exploration and acquisition cycle, and reduce the gravity exploration and acquisition costs, with obvious economic benefits.

[0056] The present invention is used to perform gravity near-area terrain correction through an RTK continuous measurement method, thereby improving near-area terrain correction efficiency and gravity data acquisition efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 Shown is a flow chart of a method according to an embodiment of the present invention;

[0058] Figure 2Schematic diagram showing the distribution of terrain correction points designed for near-area terrain correction using the square domain method according to an embodiment of the present invention;

[0059] Figure 3 Schematic diagram showing the distribution of terrain correction points designed for near-zone terrain correction using the circular domain method according to an embodiment of the present invention;

[0060] Figure 4 FIG2 is a schematic diagram of a path for continuous topographic measurement using RTK with near-area terrain correction using the square method according to an embodiment of the present invention;

[0061] Figure 5 FIG2 is a schematic diagram of a path for continuous topographic measurement using a circular domain method for near-area terrain correction using RTK according to an embodiment of the present invention;

[0062] Figure 6 FIG. 2 is a block diagram of an apparatus according to an embodiment of the present invention. DETAILED DESCRIPTION

[0063] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0064] Embodiment A method and device for correcting near-region gravity terrain based on RTK continuous measurement method

[0065] Gravity exploration is one of the most fundamental geophysical exploration methods, with broad applications and important roles in geological surveys, energy resource exploration, engineering surveys, and other aspects of society. Its theoretical basis is the theory of universal gravitation, and gravity measurements include the gravitational contribution of all materials with mass.

[0066] Subsurface structures and geological bodies are the targets of gravity exploration. Any other mass outside of these targets is considered an interference factor and needs to be eliminated or suppressed from gravity measurements. Undulating terrain is also an interference factor in gravity exploration, as it is irrelevant to the geological exploration target and needs to be removed through terrain correction.

[0067] This embodiment provides a method for correcting near-region gravity terrain based on RTK continuous measurement. Figure 1 As shown in FIG, the gravity near-area terrain correction method based on the RTK continuous measurement method includes the following steps:

[0068] S1. Start the RTK base station;

[0069] In this embodiment, the RTK reference station equipment uses a self-built RTK reference station. Before starting field work, first set up the GNSS positioning device antenna at the measurement control point and measure the antenna height, then set up and connect the RTK reference station equipment;

[0070] Turn on the GNSS locator and enter the measurement control point coordinates, elevation and antenna height in the GNSS locator handbook;

[0071] Set the GNSS locator to work in RTK base station mode and start the RTK base station operation.

[0072] The above-mentioned RTK base station setup is for conventional RTK measurement methods. In actual applications, the RTK base station can also be a network RTK base station. In this case, the operation team no longer needs to set up and operate a separate RTK base station equipment. Instead, they only need to use a GNSS positioner with network RTK signal reception capabilities to receive the network RTK signal provided by the network RTK signal provider to carry out RTK measurement and positioning.

[0073] The GNSS locator and RTK base station equipment remain powered on and working until all field RTK measurement work is completed that day.

[0074] S2. Determine the actual gravity point position

[0075] In this embodiment, the operator reaches the approximate position of the designed gravity point according to the instructions of the topographic map and / or the navigation instrument, and determines the actual gravity point position within the point offset tolerance range;

[0076] Among them, the operating personnel can take a vehicle or walk to the vicinity of the designed gravity point. Since not all locations are suitable as gravity points, it is necessary to select a ground location with relatively flat terrain, away from steep slopes and other places with rapid terrain changes within the point offset limit to determine it as the actual gravity point location.

[0077] S3. Actual gravity point positioning

[0078] Use GNSS locator to measure the coordinates and elevation of the actual gravity point;

[0079] In this embodiment, the centering rod of the GNSS locator antenna is erected on the actual gravity point, and the antenna height from the antenna to the actual gravity point is measured;

[0080] Enter the antenna height of the point in the GNSS locator handbook and set the measurement mode to point measurement mode;

[0081] Use a GNSS locator to automatically measure and record the coordinates and elevation of the actual gravity point.

[0082] S4. Set RTK continuous measurement mode

[0083] Set the GNSS locator to RTK continuous measurement mode and start RTK continuous measurement;

[0084] In this embodiment, before starting the near-area terrain correction measurement, the surveyor carries the GNSS locator antenna in a backpack and measures the antenna height when carrying it.

[0085] Enter the antenna height into the GNSS locator handbook and set the GNSS locator to RTK continuous measurement mode.

[0086] S5, RTK continuous topographic measurement

[0087] The GNSS positioner will automatically and continuously record the coordinates and elevation of the terrain along the terrain correction path while walking through the approximate locations of each designed terrain correction point.

[0088] In this embodiment, based on the coordinates of the actual gravity point and in accordance with the requirements of the near-area terrain correction method, the coordinates of the design terrain correction points for each required measurement elevation are calculated and input into the GNSS positioning device;

[0089] Carrying the GNSS locator antenna, guided by the GNSS locator handbook, walk through the approximate locations of each designed terrain correction point in turn;

[0090] The coordinates and elevation of the terrain on the terrain correction path are automatically and continuously recorded by the GNSS locator.

[0091] Among them, according to the requirements of the near-area terrain correction method, two gravity near-area terrain correction methods, the square domain method and the circular domain method, can be used. Figures 2 and 3 The following are the distribution diagrams of terrain correction points designed for near-area terrain correction using the square domain method and the circular domain method in this embodiment, Figure 2 The length of the middle half side is 20m, including 8 design terrain correction points, including 4 corner points and 4 side midpoints. Figure 3 The radii of the three central rings are 5 meters, 10 meters, and 20 meters respectively, and include 24 designed terrain correction points in eight directions at 45° intervals on the three rings. The center point "0" in the figure represents the position of the actual gravity point, and "+" represents the designed terrain correction point that requires field measurement.

[0092] Guided by the GNSS locator handbook, we walked through the approximate positions of the designed terrain correction points in turn and obtained the following Figures 4 and 5 The schematic diagram of the RTK continuous topographic measurement path for near-area terrain correction using the square domain method and the circular domain method is shown. Figure 4 The middle one is from A to H in order, Figure 5 The path is walked from A to X in sequence. During the measurement process, there is no need to reach the exact designed terrain correction point. The measurement can be completed instantly through the GNSS positioning device. The GNSS positioning device automatically and continuously records the coordinates and elevation of the terrain on the path, and the elevation of each designed terrain correction point can be obtained.

[0093] S6. Gridding of Near-Area Terrain Data

[0094] Grid the coordinates and elevation of the terrain on the path to form the nearby terrain elevation grid data;

[0095] In this embodiment, the coordinates and elevation of the terrain on the path are downloaded from the GNSS locator, and the GNSS locator automatically and continuously records the coordinates and elevation of the terrain on the path, and the data is gridded together with the coordinates and elevation of the actual gravity point to form near-area terrain elevation grid data.

[0096] Among them, the gridding range value is the maximum near-area terrain correction radius range centered on the actual gravity point; when the near-area terrain correction of the circular domain method is adopted, the grid spacing value is less than or equal to the radius of the smallest ring in each terrain ring; in this embodiment, the radius of the smallest ring of the circular domain method is 5m, so the grid spacing of the near-area terrain correction using the circular domain method is preferably 2 meters or 5 meters; when the near-area terrain correction of the square domain method is adopted, the grid spacing value is less than or equal to half the length of the square side; in this embodiment, the half length of the square side is 20m, so the grid spacing of the near-area terrain correction using the square domain method is preferably 10 meters or 20 meters; the gridding calculation method is the minimum curvature method or other gridding methods that highlight the terrain trend characteristics;

[0097] S7. Calculation of relative height difference of terrain

[0098] The elevation of each designed terrain correction point is calculated by interpolation from the nearby terrain elevation grid data, and its height difference and inclination relative to the actual gravity point are calculated.

[0099] S8, Near-area terrain correction calculation

[0100] Calculate the near-area terrain correction value of the actual gravity point according to the gravity near-area terrain correction calculation formula and add it to the gravity measurement value;

[0101] In this embodiment, the elevation difference or inclination angle of each designed terrain correction point relative to the actual gravity point is used to calculate the terrain correction value corresponding to the terrain block represented by each designed terrain correction point according to the gravity near-zone terrain correction calculation formula;

[0102] Sum the terrain correction values ​​corresponding to each terrain block to obtain the terrain correction value near the actual gravity point;

[0103] Add the near-area terrain correction value to the gravity measurement value to achieve gravity near-area terrain correction.

[0104] like Figure 6 FIG. 1 is a block diagram of a near-zone gravity terrain correction device based on RTK continuous measurement method according to this embodiment. The device includes:

[0105] RTK base station equipment, used to receive GNSS satellite signals in real time, calculate and send differential signals to field mobile GNSS locators;

[0106] GNSS locator, used to measure the coordinates and elevation of the actual gravity point, and automatically and continuously record the coordinates and elevation of the terrain on the terrain correction path;

[0107] The data gridding module is used to grid the coordinates and elevation of the terrain on the path to form the nearby terrain elevation grid data;

[0108] The interpolation calculation processing module is used to interpolate the elevation of each designed terrain correction point from the terrain grid data and calculate its height difference and inclination relative to the actual gravity point;

[0109] The near-area terrain correction value determination module is used to calculate the near-area terrain correction value of the actual gravity point according to the gravity near-area terrain correction calculation formula, and add the near-area terrain correction value to the gravity measurement value to realize the gravity near-area terrain correction.

[0110] It should be noted that the gravity near-zone terrain correction device based on RTK continuous measurement method provided in the above embodiment only uses the division of the above functional modules as an example when performing data processing. In actual applications, the above functions can be assigned to different functional modules as needed.

[0111] Taking the near-region terrain in the southern part of Sichuan Province as an example, this embodiment is compared with the existing gravity near-region terrain correction method.

[0112] Among them, the existing method of gravity near-zone terrain correction is that one person operates a forest compass to determine eight directions, and then two people run a ruler in the eight directions to the approximate position of the designed terrain point, and calculate the horizontal distance by measuring the slant distance and altitude angle. After multiple measurements and repeated position adjustments, the ruler runners reach the position of the designed terrain point, and then measure the height difference of the point relative to the actual gravity point, and finally calculate the near-zone terrain correction value.

[0113] Compared with the traditional gravity near-zone terrain correction method, the working time and number of workers of the near-zone terrain correction adopted in this embodiment are shown in Table 1.

[0114] Table 1

[0115]

[0116] As shown in Table 1, compared with the existing gravity near-zone terrain correction method, this embodiment can save terrain correction workers, improve gravity exploration efficiency, shorten the gravity exploration acquisition cycle, and reduce gravity exploration acquisition costs.

[0117] It should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art may still modify the technical solutions described in the above embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for near-region gravity terrain correction based on RTK continuous measurement method, characterized in that: The following steps are involved: Start the RTK base station device; Determine the actual gravity point location and use a GNSS locator to measure the coordinates and elevation of the actual gravity point; Set the GNSS locator to RTK continuous measurement mode and start RTK continuous measurement; The GNSS positioner will automatically and continuously record the coordinates and elevation of the terrain along the terrain correction path while walking through the approximate locations of each designed terrain correction point. Grid the coordinates and elevation of the terrain on the path to form the nearby terrain elevation grid data; The coordinates and elevation of the terrain on the path are gridded to form the near-area terrain elevation grid data, specifically including: The GNSS locator automatically and continuously records the coordinates and elevation of the terrain on the path, and grids the data together with the coordinates and elevation of the actual gravity point to form the nearby terrain elevation grid data; The data is gridded, and the gridding range is the maximum near-area ground modification radius range centered on the actual gravity point; When using the circular method for near-area terrain correction, the grid spacing is less than or equal to the radius of the smallest ring in each terrain ring; When using the near-area terrain correction method, the grid distance is less than or equal to half the length of the square side; Interpolate the elevation of each designed terrain correction point from the nearby terrain elevation grid data, and calculate its height difference and inclination relative to the actual gravity point; Calculate the near-area terrain correction value of the actual gravity point according to the gravity near-area terrain correction calculation formula and add it to the gravity measurement value; The calculation of the near-area terrain correction value of the actual gravity point according to the gravity near-area terrain correction calculation formula and adding it to the gravity measurement value specifically includes: Using the height difference or inclination of each designed terrain correction point relative to the actual gravity point, and following the gravity near-zone terrain correction calculation formula, calculate the terrain correction value corresponding to the terrain block represented by each designed terrain correction point; Sum the terrain correction values ​​corresponding to each terrain block to obtain the terrain correction value near the actual gravity point; Add the near-area terrain correction value to the gravity measurement value to achieve gravity near-area terrain correction.

2. The method for correcting near-region gravity terrain based on RTK continuous measurement according to claim 1, characterized in that: The RTK reference station equipment adopts a self-built RTK reference station or a network RTK reference station; When using a self-built RTK base station, start the RTK base station device, including: Set up GNSS positioning antennas at survey control points and measure antenna heights, and set up and connect RTK base station equipment; Turn on the GNSS locator and enter the measurement control point coordinates, elevation and antenna height in the GNSS locator handbook; Set the GNSS locator working mode to RTK base station mode and start RTK base station operation; When a network RTK base station is used, the network RTK signal provider starts the RTK base station device and sends the network RTK signal.

3. The method for correcting near-region gravity terrain based on RTK continuous measurement according to claim 1, characterized in that: Determining the actual gravity point position specifically includes: According to the instructions of the topographic map and / or navigator, reach the approximate position of the designed gravity point and determine the actual gravity point position within the point offset tolerance.

4. The method for correcting near-region gravity terrain based on RTK continuous measurement according to claim 3, characterized in that: The method of measuring the coordinates and elevation of the actual gravity point using a GNSS locator specifically includes: Place the centering pole of the GNSS locator antenna on the actual gravity point and measure the height from the antenna to the actual gravity point. Enter the antenna height of the point in the GNSS locator handbook and set the measurement mode to point measurement mode; Use a GNSS locator to automatically measure and record the coordinates and elevation of the actual gravity point.

5. The method for correcting near-region gravity terrain based on RTK continuous measurement according to claim 1, characterized in that: Setting the GNSS locator to RTK continuous measurement mode and starting RTK continuous measurement specifically includes: Carry the GNSS locator antenna on your back and measure the height of the antenna after carrying it; Enter the antenna height into the GNSS locator handbook and set the GNSS locator to RTK continuous measurement mode.

6. The method for correcting near-region gravity terrain based on RTK continuous measurement according to claim 1, characterized in that: The GNSS positioning device automatically and continuously records the coordinates and elevation of the terrain along the terrain correction path while sequentially passing through the approximate locations of the designed terrain correction points. Specifically, the following steps are performed: Based on the coordinates of the actual gravity point and the requirements of the near-area terrain correction method, the coordinates of the design terrain correction points for each required measurement elevation are calculated and input into the GNSS positioning device; Carrying the GNSS locator antenna, guided by the GNSS locator handbook, walk through the approximate locations of each designed terrain correction point in turn; The coordinates and elevation of the terrain on the terrain correction path are automatically and continuously recorded by the GNSS locator.

7. The correction device for the gravity near-zone terrain correction method based on the RTK continuous measurement method according to any one of claims 1 to 6, characterized in that: include: RTK base station equipment, used to receive GNSS satellite signals in real time, calculate and send differential signals to field mobile GNSS locators; GNSS locator, used to measure the coordinates and elevation of the actual gravity point, and automatically and continuously record the coordinates and elevation of the terrain on the terrain correction path; The data gridding module is used to grid the coordinates and elevation of the terrain on the path to form the nearby terrain elevation grid data; The interpolation calculation processing module is used to interpolate the elevation of each designed terrain correction point from the terrain grid data, and calculate its height difference and inclination relative to the actual gravity point; The near-area terrain correction value determination module is used to calculate the near-area terrain correction value of the actual gravity point according to the gravity near-area terrain correction calculation formula, and add the near-area terrain correction value to the gravity measurement value to realize the gravity near-area terrain correction.

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