Tightly coupled IFOG-based GGP implementation and field test results

Four (4) meters SEP (spherical error probable) in an integrated GPS/inertial mode and 10 meters error growth after 5 minutes without GPS reception were achieved with an interferometric fibre optic gyro (IFOG)-based GPS guidance package (GGP) under harsh field conditions. The 295 cubic inch, 14 pound Phase 1 GGP systems were evaluated under controlled laboratory conditions and during van testing, as well as in a US Army Fire Support Team Vehicle (FISTV). During the FISTV Demonstration, the GGP significantly outperformed the Army's currently used equipment. The results of these tests validated the tightly coupled GPS/inertial design approach with fiber optic sensors, and the system's suitability for applications with demanding environmental requirements. Current development is focused on 0.8 nmi/hr inertial performance and miniaturization of the system to a 100 cubic inch, 7 pound package. The Phase 2 design provides capabilities of high dynamics and low jamming susceptibility, as well as adaptability to multiple military and commercial applications with a low cost production system.