Patent ID: 6262680
Filing Date: 2001-07-17
Classification: G01S

Abstract:
A rocket trajectory estimating method comprising the steps of:measuring a GLOS angle of a flying rocket by a tracking system;passing the resulting GLOS angle data through a batch filter to reduce noises;estimating a rocket trajectory on the basis of said GLOS angle data, the noises of which have been reduced;passing the resulting rocket trajectory data through a Kalman filter to estimate biases, and correcting said GLOS angle data by eliminating the biases estimated by the Kalman filter; andestimating said rocket trajectory again on the basis of the corrected GLOS angle data, the biases of which have been eliminated, and a positional information of said tracking system, wherein saidKalman filter estimates the biases on the basis of a pseudo change of a trajectory obtained by updating an extended state vector which includes bias state variables as well as rocket trajectory state variables according to a trajectory dynamics equation.