Importance

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Abstract

A method of determining the position of a navigation device when only relatively poor GPS signals are available is described, together with a navigation device capable of determining its current location in such conditions. The method comprises the steps of receiving a plurality of GPS signals from a plurality of GPS satellites, determining range information from timing information forming part of said signals, together with identification information, specific to each of said satellites, attempting to receive and store the entire ephemeris data payloads additionally forming part of each said signals and being specific to each of said satellites.

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First Claim