A method for constructing a three-dimensional control network based on non-free station setting of absolute distance measurement instruments

Abstract

The present invention relates to a method for constructing a three-dimensional control network based on non-free station setting of absolute distance measuring instruments, and belongs to the field of precision industrial and engineering measurement. The method comprises the following steps: 1) using an absolute distance measuring instrument to measure the absolute distance between each control point and all control points except the control point, and constructing an adjustment model based on the absolute distances between each control point; 2) using the LM algorithm to perform coordinate approximation on the three-dimensional coordinates of each control point to obtain the approximate coordinates of each control point: the iteration parameters in the LM algorithm are calculated based on the values of the overdetermined nonlinear equations at each iteration solution set and a scaling factor, and the scaling factor and the solution set of each iteration are adaptively adjusted based on the convergence of each iteration; 3) using the approximate coordinates of each control point to perform adjustment solution on the adjustment model, and constructing a three-dimensional control network based on the adjustment solution results. The three-dimensional control network established by the method of the present invention has high accuracy and can realize spatial three-dimensional coordinate intersection measurement without self-calibration.

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