GPS Sensor Model for Modern Avionics System Simulation

Rajendra Malla and Charles Behre

Abstract:	The modern day avionics system is a combination of sub-systems of complex multiple sensors. The GPS sensor plays a vital role in providing precise time, position, and navigation support to the system. A modern GPS sensor model necessarily includes functional models for antennas with anti-jam (AJ) capability, receiver tracking loops, and all known environmental effects. Indeed, such a simulation capability can be used interchangeably with Hardware in the Loop (HWIL) Simulations. The navigation filter of the GPS sensor model works with the integrity monitoring fault detection and exclusion model, in order to simulate the receiver positioning and navigational behavior under any desired satellite integrity conditions. The AJ model accurately represents the effects of jamming and anti-jamming on the GPS signal. The tracking loop model outputs simulated measurement data with the corresponding expected measurement errors and GPS satellite ephemeris of all available satellites tracked by the receiver. These measurement data are used by the model of the main navigator of the avionics system. The main navigator model is closely tied to the accuracy and optimal use of the receiver model outputs. The navigation filter also performs the aiding by providing the GPS based corrections to the inertial navigation system. Differential GPS can also be applied to the measurements that are output by the GPS Sensor model. The navigation data output in the form of position, velocity, acceleration and time are used by the main flight management system. In this paper, a brief description of system architecture of Raytheon’s GPS Sensor Model is presented.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	1777 - 1785
Cite this article:	Malla, Rajendra, Behre, Charles, "GPS Sensor Model for Modern Avionics System Simulation," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 1777-1785.
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