Development of a FOG-based GPS/INS

Honeywell and its teammates, Allied Signal and Trimble, have developed a design for a compact (100 in³) integrated Global Positioning System/Inertial Navigation System (GPS/INS) under the GPS Guidance Package (GGP) Program funded by DARPA. This effort included developing new inertial sensor technology and implementing inertial aiding of the GPS receiver´s tracking loops. The inertial sensors consist of fiber-optic gyroscopes and solid-state silicon accelerometers suitable for a 1-nmi/hr-class navigation system. Inertial aiding of the GPS receiver´s carrier tracking loop was used to enhance tracking under severe dynamics without compromising anti-jam performance. This paper reviews the system architecture, provides a brief description of the key subassemblies and describes the test results from a prototype unit. These prototype units demonstrated the capabilities of the overall system, including integrated GPS/INS navigation and enhanced performance of the GPS receiver as a result of carrier loop aiding