Significant adoption of Global Navigation Satellite System (GNSS) services by government, industry, and private users creates a dependency. A loss of service whether accidental or otherwise can have economic and political consequences. In the United States, ubiquitous GPS usage classifies the system as critical infrastructure. Numerous reports and studies assessed the vulnerabilities associated with short- or long-term outages. Recommendations to minimize safety, environmental, or economic impacts include the retention or provision of alternate services that provide position, velocity, and time.
Loran is, for the largest user communities, the only viable alternative system. It is:
· Characterized by dissimilar failure modes to GNSS
· Difficult to jam due to high power levels
· Provision of an area navigation capability (RNAV)
· Precise time and frequency service
· Capable of meeting harbor/harbor minimums
· Most cost effective per square kilometer
Technological improvements in transmitter performance, system control, and end-user signal processing equipment and antennas offer improved system accuracy, availability, and integrity.