A method to solve the inconsistency between satellite baseline solution scale and total station distance measurement scale

Abstract

The present invention discloses a method for solving the inconsistency between the satellite baseline solution scale and the total station distance measurement scale. The method is applicable to related operations of precise construction measurement using the satellite baseline to solve plane coordinates. The method can ensure the consistency between the satellite baseline scale used for coordinate solution and the total station distance measurement scale, that is, within a certain error range, meet the precise construction measurement technical requirements, and thus improve the accuracy of plane coordinate solution.

Description

Technical Field

[0001] The invention relates to the technical field of precision engineering measurement, and in particular to a method for solving the inconsistency between a satellite baseline solution scale and a total station distance measurement scale. Background Art

[0002] The construction control network is the control benchmark for engineering construction. It is figuratively called the "dragon vein" and "skeleton" of engineering construction. It is the starting data for construction layout, metal installation and deformation monitoring in the project area, and plays a vital role in engineering construction. The calculation accuracy of the satellite baseline side length determines the accuracy of the plane coordinate calculation, which in turn affects the level of the construction control network. If the level of the construction control network is low and the accuracy is poor, it will affect the accuracy of the measurement site operation, thereby affecting the quality of engineering construction.

[0003] According to the investigation, in the data processing process of most engineering control network construction, the satellite baseline solution software has some satellite baseline side lengths with the weakest side relative mean error exceeding the limit during the data solution process, but the coordinate adjustment result indicators calculated by the satellite baseline software meet the corresponding grade requirements of the specification. In actual work, for the problem of excessive accuracy of individual satellite baseline lengths, no certain technical means are taken to eliminate or reduce it, and the coordinate values ​​obtained by the software are directly used for construction work. Therefore, it is necessary to explore a method to solve the inconsistency between the satellite baseline solution scale and the total station ranging scale, eliminate or reduce the error, so as to eliminate the hidden dangers of measurement accidents, escort construction safety and engineering quality, and have important significance for engineering measurement, especially precision engineering measurement. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned background technology and provide a method for solving the inconsistency between the satellite baseline solution scale and the total station ranging scale. The method is suitable for related operations of precision construction measurement using satellite baselines to solve plane coordinates. It can ensure the consistency of the satellite baseline scale used for coordinate solution and the total station ranging scale, that is, within a certain error range, meet the technical requirements of precision construction measurement, thereby improving the accuracy of plane coordinate solution.

[0005] In order to realize the above technical features, the object of the present invention is achieved as follows: a method for solving the inconsistency between the satellite baseline solution scale and the total station ranging scale, comprising the following steps:

[0006] Step 1: Obtain known point information and satellite original observation data within the survey area and construct the satellite baseline vector;

[0007] Step 2: Calculate the horizontal distance between control points based on the precise elevation coordinate information of each control point within the survey area and the satellite baseline length information;

[0008] Step 3: Establish a transformation model between the length of the satellite baseline and the horizontal distance of the control point, the height difference between the control point and the projection surface, and the coordinate system parameters of the satellite original observation data;

[0009] Step 4: Calculate the model parameters using the original satellite observation data and the precise elevation values ​​of the control points, obtain the specific form of the satellite baseline length modification formula, and calculate the length L of the satellite baseline after modification.

[0010] Step 5: Use a precision total station to check the distance between control points and compare it with the length of the modified satellite baseline to verify the scale.

[0011] In step 2, taking control points A and B as an example, the specific process of calculating the horizontal distance between control points is as follows:

[0012]

[0013] h1=h b -h a (2)

[0014] Where V is the horizontal distance between control points, in meters; L1 is the length of the satellite observation baseline, in meters; h1 is the height difference between control points, in meters; h a ,h b They are the normal elevations of points A and B, in m.

[0015] The modified model in step 3 is:

[0016]

[0017]

[0018] Where L is the modified value of the satellite baseline side length, in meters; V is the horizontal distance between control points, in meters; ΔH is the height difference between the control point and the projection surface, in meters; h a ,h b They are the normal elevation values ​​of points A and B, in m and h respectively. m is the normal elevation value of the average elevation surface of the survey area, in m; a is the average radius of curvature of the earth, in m.

[0019] The present invention has the following beneficial effects:

[0020] The method of the present invention has strong applicability, reliable accuracy, and has been verified over a long period of time. It can greatly improve the accuracy of plane coordinate solution using the side length of the satellite baseline, thereby effectively improving the accuracy of the construction control network, and has high practical value in precision construction measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] Figure 1 This is the layout diagram of the construction control network in the survey area.

[0023] Figure 2 This is a partial map of the construction control network in the survey area. DETAILED DESCRIPTION

[0024] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0025] Embodiment 1:

[0026] A method for solving the inconsistency between the satellite baseline solution scale and the total station ranging scale includes the following steps:

[0027] Step 1: Obtain known point information and satellite original observation data within the survey area and construct the satellite baseline vector;

[0028] Step 2: Based on the precise elevation coordinate information of each control point within the survey area and the satellite baseline length information, calculate the horizontal distance between control points; taking control points A and B as an example, the specific process of calculating the horizontal distance between control points is as follows:

[0029]

[0030] h1=h b -h a (2)

[0031] Where V is the horizontal distance between control points, in meters; L1 is the length of the satellite observation baseline, in meters; h1 is the height difference between control points, in meters; h a ,h b They are the normal elevations of points A and B, in m.

[0032] Step 3: Establish a transformation model between the length of the satellite baseline and the horizontal distance of the control point, the height difference between the control point and the projection surface, and the coordinate system parameters of the satellite original observation data;

[0033]

[0034]

[0035] Where L is the modified value of the satellite baseline side length, in meters; V is the horizontal distance between control points, in meters; ΔH is the height difference between the control point and the projection surface, in meters; h a ,h b They are the normal elevation values ​​of points A and B, in m and h respectively. m is the normal elevation value of the average elevation surface of the survey area, in m; a is the average radius of curvature of the earth, in m.

[0036] Step 4: Calculate the model parameters using the original satellite observation data and the precise elevation values ​​of the control points, obtain the specific form of the satellite baseline length modification formula, and calculate the length L of the satellite baseline after modification.

[0037] Step 5: Use a precision total station to check the distance between control points and compare it with the length of the modified satellite baseline to verify the scale.

[0038] Embodiment 2:

[0039] Figure 1 For a construction control network layout of an actual project, the site data is obtained using a GPS receiver and combined with the satellite baseline side length calculation process. Figure 2 , taking the three baselines P01-P08, P01-P11 and P03-P11 as examples, the present invention is further elaborated in detail.

[0040] Step 1: In this measurement, the control points are distributed as follows: Figure 1 As shown, P01 and P02 are known points, and P03 to P11 are control points with unknown coordinate information;

[0041] Step 2: Based on the satellite observation baseline length and height difference information, calculate the horizontal distances of the three satellite baselines P01-P08, P01-P11 and P03-P11 in the survey area control network. The results are as follows:

[0042] Table 1 Control point horizontal distance results table

[0043]

[0044] Note: P01 is at an elevation of 572.2482m; P08 is at an elevation of 509.6691m; P11 is at an elevation of 475.2554m; and P03 is at an elevation of 579.5355m.

[0045] Step 3: Establish a correction model between the length of the satellite baseline and the horizontal distance of the control point, the height difference between the control point and the projection surface, and the coordinate system parameters of the satellite original observation data, as shown in formula (3);

[0046] Step 4: Input the changed model parameters into formula (3) for solution. GPS uses the WGS84 coordinate system, so the average radius of curvature of the earth a in formula (3) is 6371000m.

[0047] Step 5: Substitute the parameters obtained in step 3 into formula (4) to obtain the length of the modified satellite baseline. The results are shown in Table 2:

[0048] Table 2 Satellite baseline length modification results

[0049]

[0050] Note: The projection surface is 470m; P01 elevation is 572.2482m; P08 elevation is 509.6691m, P11 elevation is 475.2554m, and P03 elevation is 579.5355m.

[0051] Step 6: Use a precision total station to observe the lengths of the three baselines P01-P08, P01-P11, and P03-P11, and project them onto the same projection plane as the satellite baseline lengths. Compare them with the satellite lengths before and after the modification, and perform scale analysis, as shown in Table 3.

[0052] Table 3 Comparison of the side lengths observed by the total station and before and after the satellite baseline projection modification

[0053]

[0054]

[0055] Note: The total station side length and satellite baseline side length in the table use the same modified elevation surface of 470m.

[0056] in conclusion:

[0057] Taking the side length measured by the precision total station as the benchmark, the deviation between the modified satellite baseline side length and the benchmark value is calculated, and the accuracy is tested. From Table 3, it can be seen that the horizontal deviation between the modified satellite baseline side length and the total station measured side length is greatly reduced. Within a certain error range, the consistency of the satellite baseline side length and the total station measured scale is effectively guaranteed, ensuring the accuracy and reliability of the precision construction quality.

Claims

1. A method for solving the inconsistency between satellite baseline solution scale and total station ranging scale, characterized in that: The following steps are involved: Step 1: Obtain known point information and satellite original observation data within the survey area and construct the satellite baseline vector; Step 2: Calculate the horizontal distance between control points based on the precise elevation coordinate information of each control point within the survey area and the satellite baseline length information; Step 3: Establish a transformation model between the length of the satellite baseline and the horizontal distance of the control point, the height difference between the control point and the projection surface, and the coordinate system parameters of the satellite original observation data; Step 4: Use the original satellite observation data and the precise elevation values ​​of the control points to calculate the parameters of each model, obtain the specific form of the satellite baseline length modification formula, and calculate the length of the satellite baseline after modification. L ; Step 5: Use a precision total station to check the distance between control points and compare it with the length of the modified satellite baseline to verify the scale; In step 2, taking control points A and B as an example, the specific process of calculating the horizontal distance between control points is as follows: （1） h 1= h b - h a （2） In the formula, V is the horizontal distance between control points, in m; L 1 is the satellite observation baseline length, in meters; h 1 is the height difference between control points, in meters; h a , h b are the normal elevations of points A and B, in meters; The modified model in step 3 is: （3） （4） In the formula, L It is the modified value of the satellite baseline side length, in meters; V is the horizontal distance between control points, in m; is the height difference between the control point and the projection surface, in meters; h a , h b are the normal elevations of points A and B, in meters. h m is the normal elevation value of the average elevation surface of the survey area, in meters; a is the mean radius of curvature of the earth, in meters.

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