GPS Receiver Protection Requirement for Unmanned Ariel Vehicle

In the area of military avionics, the most promising application areas of Global Positioning System (GPS) include missile guidance, Unmanned Ariel Vehicle (UAV) guidance and control and precision aircraft landings. Though spread spectrum technique is used for GPS anti-jamming requirements, but this alone fails to ensure protection of GPS receiver from jamming vulnerability. The existing guidance and control mechanism of aircrafts and UAVs is Inertial Navigation System (INS) and to some extent ground based support instrumentation. The GPS receiver integrated with INS is used for the guidance, control and maneuvering of missiles and UAVs. In this paper, the GPS signals interference caused due to various jammers are presented indicating the performance limitations of the GPS receivers for military applications. Applications of several GPS anti-jamming techniques that ensure its robustness are presented in this paper.