Patent ID: 6917880
Filing Date: 2005-07-12
Classification: G01S

Abstract:
1. A method for implementing a passive navigation system for an air vehicle which comprises the steps of: providing a database for a plurality of emitters, wherein the database includes information regarding the geolocation of each emitter in the database, and information regarding at least one characteristic operating factor contained in signals transmitted by a respective emitter; receiving a signal from at least one emitter, said signal originating at a distance from the air vehicle; isolating the signal received from the emitter; processing the received signal using operating factor information in the database to establish an identity of the emitter; evaluating the geolocation information for the identified emitter in the database to estimate a direction of arrival for the air vehicle to the identified emitter; and using the emitter identity and direction of arrival to determine a course location of the air vehicle for use in navigation.