The Global Positioning System (GPS) has been used for over a decade by civilian and military users alike. During this time all GPS users have experienced signal degradation, both from intentional and unintentional signal interference. Navigation systems have successfully integrated various sensors to achieve the required position accuracy. Today the most common military, earth-centered-earth-fixed (ECEF), precise, navigation system is comprised of an inertial measurement system and a GPS receiver. As the dependence on GPS has increased, inexpensive jammers have become more and more available, GPS receivers (and antennas) have become more expensive and complex to defeat the threat, and the cycle repeats. This paper lays out the design architecture of a system that utilizes a narrow beam width altimeter and the Digital Terrain Elevation Database (DTED), to provide terrain aided navigation (TAN). This system is integrated into an existing navigation system, which provides navigation in the presence of GPS jamming.
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