In order to reduce the influence of vehicular platform deformation on the theodolite measuring precision

compensate the angle error caused by large deformation

and to realize the trajectory measurement worked on mobile station

the principle of the effect of platform deformation on the measuring results was analyzed

and the center deformation angles caused by the platform deformation were measured by using dual-axis inclinometers put on the center of the azimuth axis

then the measuring coordinate deflection was calculated to figure out the deformation profile.The finite deformation testing results were storaged in a computer and a two-dimensional look-up table was created by taking azimuth and elevation angles as inputs. Finally

the any deformation angles on any azimuth and elevation angles were interpolated and calculated to complete the error compensation after the task.Results show that this method can compensate the error as large as 142″ caused by the platform deformation and can improve the azimuth precision by 44″ and elevation precision by 8.5″. It is shown that the method is a credible approach to pointing error correction of high precision vehicular platform theodolites.