Three-dimensional control network construction method based on non-free station setting of absolute distance measurement instrument

The invention relates to a three-dimensional control network construction method based on non-free station setting of an absolute distance measurement instrument, and belongs to the field of precision industry and engineering measurement. The method comprises the following steps of: 1) measuring absolute distances between each control point and all control points except the control point by adopting an absolute distance measurement instrument, and constructing an adjustment model according to the absolute distances between the control points; 2) performing coordinate budget on the three-dimensional coordinate of each control point by using an LM algorithm to obtain an approximate coordinate of each control point: calculating an iteration parameter in the LM algorithm according to a value of an overdetermined nonlinear equation set at each iteration solution set and a scaling factor, and adaptively adjusting the scaling factor and the solution set of each iteration according to a convergence condition of each