Patent ID: 6630904
Filing Date: 2003-10-07
Classification: G01C,G01S

Abstract:
A system for determining a multidimensional navigation state for a navigation platform based on radio navigation data transmitted by external terminals comprising:a radio navigation data receiver for receiving and amplifying said radio navigation data embedded in noise; a bank of correlators, including a prompt correlator, for extracting said radio navigation data from said noise over a range of delay error, said correlators processing said radio navigation data and said noise to generate correlator output functions indicative of the degree of correlation for each correlator between said radio navigation data and a known internal replica signal; an estimator for estimating the radio navigation data signal power and noise power from the correlator output functions; and a measurement update unit including a nonlinear filter, said measurement update unit for updating the navigation state based on conditional moments of the navigation state calculated as a function of the estimated radio navigation data signal power and noise power, and the correlator outputs.