where [h.sub.i]--geoid height above ellipsoid, which is a function of geodetic coordinates
When the digital terrain map is available, the height of the topographic surface is computed as a function of geodetic coordinates
when 3D polar measurements are produced to the point with the well-known geodetic coordinates and the coordinates of the observation instrument need to be determined (for example, to determine the position of an observation instrument in an aircraft by measurements to a point on the earth with well-known coordinates).
Furthermore, when one knows the conditional intermediate horizontal coordinates of this point, polar measurement data are deduced into the horizontal coordinate system of point [P.sub.i] with the well-known geodetic coordinates. It is necessary to know distance in space [s.sub.io], zenith angle [z.sub.io] and direction [A.sub.io] of the origin (point [P.sub.i]) of the horizontal coordinate system.
20-30 km) and for the simplification of the problem the surface of the ellipsoid may be replaced by the surface of a sphere with the curvature radius R = [square root of M x N], where M and N are the radius of curvature of meridian and radius of the curvature of prime vertical respectively calculated with respect to the geodetic coordinates of point [P.sub.i].
[PHI]--common symbol for all geodetic coordinates together, i.e.
[S.sub.[PHI](B)]--common symbol for site positions given in the geodetic coordinates estimated by the BERNESE ADDNEQ module.
[V.sub.N(B)], [V.sub.E(B)], [V.sub.Up(B)]--movement velocities determined by the BERNESE ADDNEQ module in the geodetic coordinates,
[V.sub.N(LS)], [V.sub.E(LS)], [V.sub.Up(LS)]--movement velocities determined by the Least Squares regression, independently for each coordinate, in the geodetic coordinates,