Abstract: The pseudolite-based navigation system includes: a plurality of pseudolites for transmitting a navigation signal which simulates a satellite signal transmitted from a plurality of GNSS satellites; and a portable device capable of calculating a navigation solution for a location thereof based on the signal received from the pseudolites, wherein the portable device includes: a GNSS receiver for receiving the navigation signal of the pseudolites and calculating a navigation solution based on the navigation signal; and a computing unit for calculating a final navigation solution by integrating the navigation solution calculated by the GNSS receiver and the location information of the GNSS satellites and the pseudolites.