IntroductIonMission management system (MMS) is a primary system to execute missions of the unmanned aerial vehicles (UAVs). The typical functions of MMS are navigation, flight guidance, conflict management, situation assessment and online path and tactical plannings. Figure 1 depicts the various functions of MMS. MMS gives the UAV necessary autonomy and intelligence by processing the information gathered through various onboard sensors. This demands complex hardware and software to implement 'intelligent' and 'autonomous' behaviour. The need for complexity management while keeping low costs requires new architectures and methods to cope with these requirements. Hence, MMS is designed to exploit integrated modular avionics (IMA) concept together with open system architectures. This paper presents the mission computer (MC) architecture and advanced navigation methods for MMS in the subsequent sections.In current scenario the aircraft navigation is performed by the MC with the basic sensors like INS, GPS, RADALT, and air data system. The UAV is designed to navigate according to the planned flight plan. The guidance parameters are computed by the MMS using basic sensor parameters.Navigation with INS alone yields errors to the order of 1.8 Nm/hr in position 22,23 . INS with GPS combination reduces the errors to a great extent with accuracy of around 15 m. The denial/non-availability of GPS is currently being considered as an important problem in navigation.Terrain-referenced navigation can be considered as one of the important alternatives for GPS non-availability. Terrainreferenced navigation (TRN) is a function of digital terrain system (DTS) being developed for tactical aircraft operations which offers a range of capabilities in terms of both safety and tactical benefits. DTS is designed to increase the situational awareness, to improve navigation in GPS-denied environment, and to perform safe flying at low altitudes and in valleys. The paper further elaborates on usage of terrain for GPS outage conditions. Advanced Mission Management System for unmanned Aerial Vehicles AbStrActThe paper presents advanced mission management system (MMS) for unmanned aerial vehicles, based on integrated modular avionics (IMA) architecture. IMA architecture enables the MMS to host high end functions for autonomous navigation and attack. MMS is a collection of systems to execute the mission objectives. The system constitutes mission computer (MC), sensors and other sub-systems. The MMS-MC needs to execute advanced algorithms like terrain referenced navigation, vision-aided navigation, automatic target recognition, sensor fusion, online path planning, and tactical planning for autonomy and safety. This demands high-end architecture in terms of hardware, software, and communication. The MMS-MC is designed to exploit the benefits of IMA concepts such as open system architecture, hardware and software architecture catering for portability, technology transparency, scalability, system reconfigurability and fault tolerance. This paper inv...
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