least squares method

A method of constructing a Chebyshev approximation of multivariable functions by a generalized polynomial with the exact reproduction of its values at a given points is proposed.  It is based on the sequential construction of mean-power approximations, taking into account the interpolation condition.  The mean-power approximation is calculated using an iterative scheme based on the method of least squares with the variable weight function.  An algorithm for calculating the Chebyshev approximation parameters with the interpolation condition for absolute and relative error is described.  The

The problems of reliability of results of processing of geodetic data by finite element method are analyzed. Some optimized solutions and prospects of the method are disclosed.

Knowledge of the gravity field takes significance place in today's world. Such information is very important for performing of a number of contemporary problems related to satellite technologies. Such problems include: the launch of launch vehicles, satellites orbit prediction, the study of the surface of the oceans, transformation of normal and geodetic heights and more.