Global navigation satellite system has become a de-facto standard for navigation, with enormous applications worldwide. Currently, four global navigation satellite systems are operational and a number of regional navigation satellite systems are also in place including Indian Regional Navigation Satellite System (IRNSS) which is also known as Navigation with Indian Constellation (NavIC). NavIC is a regional navigation satellite system owned and operated by ISRO. The application of GNSS ranges from commercial applications to intercontinental ballistic missiles or heavy lifters of ISRO/NASA. High dynamic NavIC receivers are used in ISRO launch vehicles for preliminary orbit determination/closed loop guidance along with inertial navigation system in an integrated manner. When such critical applications of GNSS are considered, the integrity of navigation data in real time is a prime concern. Different methods are developed by different agencies over time in this area. Usage of inbuilt health information from satellite is one of the possible methods of integrity check. Receiver autonomous integrity monitoring (RAIM) provides integrity checking of GNSS without an external aid. NavIC/GPS receiver architecture is presented in this paper, the satellite signal analysis is done, and possible integrity threats are identified. The different approaches are considered in RAIM algorithm, and a simplified RAIM approach is developed which has good real-time performance. The simulation studies and flight software development are completed.
GNSS Receiver Autonomous Integrity Monitoring
Lect.Notes Mechanical Engineering
2023-05-18
9 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
Integrity monitoring , RAIM , Pseudo-range , GNSS , Fault detection and isolation , NavIC , GPS , Satellite navigation Engineering , Aerospace Technology and Astronautics , Control, Robotics, Mechatronics , Multiagent Systems , Space Sciences (including Extraterrestrial Physics, Space Exploration and Astronautics)
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