Falling point estimation of a body in Earth gravitational field by using measurements of several motion parameters

An algorithm of falling point determination of a body in the Earth gravitational field is developed. Algorithm uses radar measurements: radial distance, radial velocity, elevation and azimuth angles. A technique for falling point error estimation is proposed. It allows to depict a scatter ellipsoid on the Earth surface. The algorithm based on augmented Kalman filter which calculates full state vector estimation using motion equations and measurements model.