Terrain Referenced Navigation Technique Using Correlation Algorithms for Cruise Vehicle
2023
The Cruise vehicle is guided by an Inertial Navigation Systems (INS) and Satellite Navigation (SatNav).Where INS provide very accurate and reliable solution for navigation, but gyroscope and accelerometers errors accumulate with time, and accordingly navigation errors also grow w.r.to time leading to very high Position drifts for long duration missions.While in SatNav performance is poor due to the signal interference and jamming.The solution to these problems leads to an introduction of another device to perform precise measurements of the vehicle's geographical position along its flight path.TERCOM is a well approved navigation technique which deals with terrain elevation.TERCOM compares the measured elevation value and on-board stored elevation value using correlation algorithm.A TERCOM system is a self-contained and provides positional fixes to cruise vehicle, aircraft, and drones.TERCOM is the only fixtaking system that can operate autonomously in a RF/ SatNav denied scenarios.TERCOM can be used in both tactical and strategic systems and operates under ECM (electronic countermeasures) conditions and provides day/night, all weather capability in low altitude terrain following scenarios.This paper presents correlation algorithm and its performance evaluation in the Western Ghats of India.