Abstract

This scientific article reserches a key problem of the construction of state spatial reference system - that’s a construction of the high accurate state Quasigeoid model. Solving of the abovementioned problem is related to series of such complicated techno-scientific tasks as construction of state GNSS network based on both GPs and GLONASS technologies, adjustment of the first and second orders state levelling networks in local geoid - based vertical system Hon Dau for determination of geopotentials of the first and second orders height points, correction of the harmonic expansion coefficients of the Earth Gravitational Mogel (EGM) based detailed gravimetric data on state territory and geopotentials of the first and second orders height points, adjustment and combining of GNSS network inti state spatial reference system. This articale also shows that the correction of the harmonic expansion coefficients of the Earth Gravitational Mogel (EGM) for getting of height anomaly with accuracy more than of 0.08 m is one of inportant scientific bases of the construction of the state Quasigeoid model with accuracy more than of 0.04 m.