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A Retrieval Method of Atmospheric Refractive Coefficient Based on Triangular Elevation Network

A technology of triangular elevation and atmospheric refraction, applied in the direction of instruments, etc., can solve problems such as large changes, difficult to calculate accurate values, instability, etc., and achieve the effect of improving applicability

Inactive Publication Date: 2015-07-29
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention provides a fast and convenient atmospheric refraction coefficient inversion method based on a triangular elevation network, aiming at the defects of the prior art such as instability, large changes, and difficulty in deriving accurate values.

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  • A Retrieval Method of Atmospheric Refractive Coefficient Based on Triangular Elevation Network
  • A Retrieval Method of Atmospheric Refractive Coefficient Based on Triangular Elevation Network
  • A Retrieval Method of Atmospheric Refractive Coefficient Based on Triangular Elevation Network

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Embodiment 1

[0047] Such as figure 1 , figure 2 and image 3 shown, according to figure 1 The method flow process of " dam appearance control network monitoring " is an application example, and the present invention is further elaborated:

[0048] There are 9 control outlets in the network, namely LE1, LE2, LE3, LE4, LE5, LS1, LS2, LS3, LS4. Using the atmospheric refraction coefficient inversion method based on the triangular elevation network of the present invention, the calculation process and results are as follows:

[0049] (1) Use the full-circle observation method of the total station to observe, and assume the instrument at the above 9 points respectively, and the observation direction at each point is as follows: figure 2 shown. There are two types of observations: zenith and slant distances.

[0050] (2) Calculate the height difference of forward measurement and return measurement of each measurement section in the network. Such as figure 2 As shown, the triangular ele...

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Abstract

The invention discloses an atmospheric refraction coefficient inverting method based on a trigonometric leveling network. The method comprises the following steps of acquiring trigonometric leveling network data; calculating the direct observation level difference hli and the reversed observation level difference h2i of each measured side in the network by the trigonometric leveling measuring method; calculating the number n of independent triangles in the network; calculating the sum Cj of the three sides of each triangle; calculating the weight Pj of each triangle in the network; calculating the level difference closure error omega j of each triangle; applying a constraint condition y; according to the relation between the constraint condition y and the atmospheric refraction coefficient k, drawing a curve graph; taking k value by using the curve graph and the constraint condition; and calculating discrepancy value delta i of the direct observation level difference and the reversed observation level difference, and finding out the k value which makes the y value minimum under the premise that the delta i and the omega j are not beyond limit. The method is more dynamic for the selection of the atmospheric refraction coefficient instead of separately using the atmospheric refraction reference coefficient; and the k value of each side is not required to be calculated, but the most appropriate k value applicable to the whole network is calculated according to related conditions, and the value has relatively high actual goodness fit, so that the applicability of the method is improved to certain degree.

Description

technical field [0001] The invention belongs to the technical field of surveying and mapping science or dam safety monitoring, and relates to an atmospheric refraction coefficient inversion method based on a triangular elevation network. Background technique [0002] The main factors affecting the accuracy of one-way trigonometric elevation measurement are distance observation error, vertical angle observation error, instrument height and target elevation measurement error, atmospheric refraction error, etc. The value error is the main part that affects the accuracy of trigonometric elevation measurement. How to implement effective atmospheric refraction correction becomes the key to improving the accuracy of one-way trigonometric elevation. [0003] At present, the survey of the dam appearance control network often spans a long area of ​​water. The conventional triangular elevation survey uses the atmospheric refraction reference coefficient (0.09-0.14) provided by the tria...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01W1/00
Inventor 黄腾沈月千黄昱旻欧乐王成
Owner HOHAI UNIV
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