e-Loran-Compatible Low Probability of Intercept/Detection(LPI/D) Alternative Navigation System

The Global Positioning System (GPS), while being highly successful, has created a single point of failure for many military and civilian applications requiring precise time and position. The Long Range Navigation (LORAN) system was a proven and stable navigation aid until it was abandoned because of the success of GPS. Now it is clear that a backup to GPS is required and the enhanced-LORAN (eLORAN) system is being proposed to take over that role. During this Phase I program Toyon proposes to modify an existing auxiliary navigation system design that is currently being developed for the Navy for GPS-denied carrier landing to include the ability to receive and process eLORAN signals as well as other communication signals. The modified receivers developed on this program will be fully compatible with that system. When developed, the system will be able to make use of GPS and other Global Navigation Satellite System (GNSS) signals, as well as eLORAN, and signals-of-opportunity (SoOp). When GPS is degraded or denied, in addition to eLORAN and SoOp, the receiver will be able to process a novel navigation waveform that will be broadcast from a pseudolite-like reference system that requires only two beacons for a full navigation solution.