A method for long-distance measurement using a straight-line control network

Abstract

The present invention discloses a method for long-distance measurement by jointly using a laser tracker and a total station with a straight-line control network, which is used for detecting long-distance equipment deviation. The method jointly measures by using a laser tracker and a total station, giving full play to the respective advantages of the two instruments, and can complete the measurement task of long-distance equipment without complex adjustment calculations.

Description

Technical Field

[0001] The present invention relates to the field of measurement technology, and particularly to a method for long-distance measurement by jointly using a laser tracker and a total station with a straight line control network. Background Art

[0002] During the measurement of some large long-distance high-precision equipment, affected by the measurement distance of the laser tracker, if only the measurement mode of the laser tracker transferring stations in sequence is adopted, it will cause continuous accumulation of measurement errors, and the errors will increase exponentially with the increase of the measurement distance. When only using a total station for measurement, it cannot meet the requirements of equipment measurement accuracy due to its ranging accuracy.

[0003] Comparative Document 1: A Method for Measuring the Straightness and Flatness of a Long-Distance Track

[0004] The present invention discloses a method for measuring the straightness and flatness of a long-distance track. By using the reference line function of the total station to measure the central point coordinate values at each mileage position of the track, the straightness deviation value and flatness deviation value at each mileage position can be directly obtained, and the flatness and straightness of the track can be obtained through simple calculation. Compared with this measurement method, the accuracy is significantly improved when using the method of joint measurement of a laser tracker and a total station. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for long-distance measurement by jointly using a laser tracker and a total station with a straight line control network. A total station is introduced for total station control measurement. Considering the problem of relatively low ranging accuracy of the total station, when laying out the control network, the advantages of the high angle measurement of the total station and the high ranging accuracy of the laser tracker are fully utilized to minimize the measurement error, and the measurement of long-distance high-precision equipment can be completed without any complex calculation.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A method for long-distance measurement by jointly using a laser tracker and a total station with a straight line control network of the present invention includes the following steps:

[0008] Set up the total station at the first control point, level and center it, aim at the second control point, and set the angle to zero;

[0009] Use the total station to lay out target ball seats between two control points;

[0010] Set up the laser tracker at the first station. After leveling, calibrating, and establishing the geoid, place the target balls at the target ball seats within the measurable range of the laser tracker respectively, and perform point measurement. Adopt the measuring point mode, and project these measurement points onto the geoid;

[0011] Verify the accuracy of the measurement points, and use the geoid projection points measured at the first station to fit a straight line; establish a coordinate system using this straight line and the geoid; measure the straightness of the equipment within the first station range;

[0012] Conduct measurements at the second station, third station,... according to the above steps; summarize all the measurement data of the transfer stations to complete the measurement work.

[0013] Furthermore, it specifically includes the following steps:

[0014] (1) Set up the total station at the first control point, level and center it, aim at the punch point on the second control point, and set the angle to zero;

[0015] (2) Use the total station to set up a target ball seat every six meters between the two control points, ensuring that when the theodolite target ball is placed on the target ball seat and in contact with the contact surface of the target ball, the total station can aim at its center point, so as to ensure that when the target ball is placed on the target ball seat and in contact with the contact surface of the target ball, the center position of the target ball is always on the line connecting the two control points;

[0016] (3) Set up the laser tracker at the first station. After leveling, calibrating, and establishing the geoid, place the target balls on the target ball seats within the measurable range of the laser tracker and in contact with the contact surface of the target balls, and conduct point measurement, and adopt the measurement point mode, and project these measurement points onto the geoid;

[0017] (4) Verify the accuracy of the measurement points: First, fit a straight line to all the projection points projected onto the geoid at the first station, check the deviation of each measurement point from the straight line. When it is found that the deviation of less than two measurement points from the straight line is greater than 0.5 mm, remove the points with larger deviation and refit a straight line;

[0018] (5) Establish a coordinate system using this straight line and the geoid;

[0019] (6) Measure the straightness of the equipment within the first station range;

[0020] (7) Continue the measurements at the second station, third station,... according to the above steps;

[0021] (8) Summarize all the measurement data of the transfer stations to complete the measurement work.

[0022] Furthermore, the target ball seat is fixed by adhesive bonding.

[0023] Compared with the prior art, the beneficial technical effects of the present invention:

[0024] The present invention does not require complex adjustment calculations, has high measurement accuracy, and is accurate and reliable. Description of the Drawings

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] Figure 1 It is a schematic diagram of the measurement scheme;

[0027] Figure 2 It is a schematic diagram of another angle of the measurement scheme;

[0028] Figure 3 It is a schematic diagram of the control points and the base;

[0029] Markings in the accompanying drawings: 1.1 - First control point; 1.2 - Second control point; 2 - Target ball seat; 3 - Laser tracker; 3-1 - First station; 3-2 - Second station; 3-3 - Third station; 4 - Equipment; 5 - Center punch point; 6 - Target ball contact surface. Specific embodiments

[0030] The following combines the attached Figure 1 , 2 , and 3 to further describe the implementation of the technical solution in detail, in order to more clearly explain its structure and working principle.

[0031] A method for long-distance measurement by jointly using a laser tracker and a total station with a linear control network, and the specific implementation method is as follows:

[0032] (1) Set up the total station at the first control point 1.1, level and center it (center it with the center punch point 5 on the first control point 1.1), aim at the center punch point 5 on the second control point 1.2, and set the angle to zero;

[0033] (2) Use the total station to lay out a target ball seat 2 every six meters between the two control points 1 (bonded with glue), and ensure that when the theodolite target ball is placed on the target ball seat 2 and contacts the target ball contact surface 6, the total station can aim at its center point. In this way, it can be ensured that when the target ball is placed on the target ball seat 2 and contacts the target ball contact surface 6, the center position of the target ball is always on the line connecting the two control points 1;

[0034] (3) Set up the laser tracker 3 at the first station 3.1. After leveling, calibrating, and establishing the geoid, place the target balls on the target ball seats 2 within the measurable range of the laser tracker and contact the target ball contact surface 6, and perform point measurement, and adopt the measurement point mode, and project these measurement points onto the geoid;

[0035] (4)Verify the accuracy of the measurement points: First, fit a straight line to all the projection points of the first station 3.1 projected onto the geodetic horizontal plane, and check the deviation of each measurement point from the straight line. When it is found that the deviation of less than two measurement points from the straight line is greater than 0.5 mm, remove the points with larger deviation and refit a straight line. It should be noted that the laser tracker (api) has sufficient ranging accuracy within 40 meters, which can ensure the coordinate values of 7 target ball seats 2 are measured within one station. This scheme has sufficient redundant observation points to ensure the measurement accuracy;

[0036] (5)Establish a coordinate system using this straight line and the geodetic horizontal plane;

[0037] (6)Measure the straightness of the equipment within the first station 3.1;

[0038] (7)Perform measurements for the second station 3.2, the third station 3.3,... according to the above process. The number of stations that the laser tracker 3 can move to is affected by the maximum observation distance and angular measurement accuracy of the total station;

[0039] (8)Summarize all the measurement data of the station moves to complete the measurement work.

[0040] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A method for long-distance measurement by jointly using a laser tracker and a total station with a straight-line control network, characterized in that The specific steps include: (1) Set up the total station at the first control point, level and center it, aim at the sample punch point on the second control point, and set the angle to zero; (2) Using a total station, a target ball seat is arranged every six meters between two control points to ensure that when the theodolite target ball is placed on the target ball seat and in contact with the target ball contact surface, the total station can aim at its center point, so as to ensure that when the target ball is placed on the target ball seat and in contact with the target ball contact surface, the center position of the target ball is always located on the line connecting the two control points; (3) After setting up the laser tracker at the first station and leveling, calibrating, and establishing the geoid, the target balls are placed on the target ball seats within the measurable range of the laser tracker and in contact with the target ball contact surface, and point measurements are performed in the point measurement mode, and these measurement points are projected onto the geoid; (4) Verify the accuracy of the measurement points: First, fit a straight line to all the projection points of the first station onto the geoid, and check the deviation of each measurement point from the straight line. If the deviation of two measurement points from the straight line is greater than 0.5 mm, remove the points with large deviation and refit a straight line. (5) Establishing a coordinate system using the straight line and the geoid; (6) Measure the straightness of the equipment within the first station; (7) Continue to measure the second station, the third station, and so on according to the above steps; (8) The measurement work is completed by summarizing the measurement data of all transfer stations.

2. The method for long-distance measurement by jointly using a laser tracker and a total station according to claim 1 to utilize a straight-line control network, characterized in that, The target ball seat is fixed by bonding with glue.

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