The GPS Net Coordinates Transform The Datum Compatibility Research And The GPS Network Deformation Analysis

It is well known, the GPS localization Achievement Belongs to the WGS-84 earth coordinate systems, but the practical survey Achievement often Belongs to some partial coordinate system, the GPS Achievement must transform to the partial coordinate system can invest the utilization. In order to reduce the length to distort, is Advantageous to the Big scale mapping And the project construction layout, the small region generally uses does not need to project the computation plane rectangular coordinates system, this coordinate system with measured the Area Average elevation surface Achievement projecting plane, through measured the Area center the meridian took the central meridian the Gauss plane rectangular coordinate system extremely Approaches. The GPS survey obtains is the WGS-84 center of earth space rectangular coordinates, But in the project construction the usual use place independent coordinate system, the request obtains the place coordinates, how realizes two transformations, is Always the hot topic which in the project construction cared About. Have two kinds of transformations models from the GPS localization result to the place coordinates. Plane transformation modular concept simple, the value stable is reliable, but is only suitable for the small scope GPS survey. The spatial transformation model may use in the wide range GPS survey, divides into 7 parameters transformations And 4 parameters According to the Actual situation transforms two kinds. In this switching process, existence datum precision question, because the known point has the residual and systematic error, there quest carries on to these Adjusted, thus the elimination error, increases the precision, finally Achieved enhances the GPS net the quality.In this Article introduced 4 methods can examine include the residual error to calculate coordinates; Also 4 methods examination results should be consistent. The comprehensive utilization 4 methods examinations Are Advantageous to the enhancement examination result reliability. Because passes Aspect the And so on technology, method restriction, the Basis technical standard not one, quite many calculated A relative present the GPS network says the precision to Be somewhat low, moreover Because executes measures the Age Already long time, many kinds of factors influence, Also possibly has had the displacement. Therefore, in carries on the GPS restraint adjusted front, to get up calculated compatibility carries on the examination is extremely essential.This topic using the elasticity theory strain Analysis method solution the control network deformation question which will cause As A result of the position existence error. The strain strength Analysis method of GPS network And the displacement deformation mathematical model in the differential ellipsoid coordinate system have been established by using the strain Analytical theory in the elasticity mechanics. The distribution of the strain strength of the simulation GPS networks has Been Analyzed. As A result, the Author has obtained some practical conclusions.