Evaluating Receiver Architectures for Inertial Aiding and Coasting

Pedro F. Silva, Joao S. Silva, Jose F.M. Lorga, Antonio Fernandez, Jose Diez, Mariano Wis, M. Eulalia Pares, and Ismael Colomina

Abstract:	In addition to Galileo core services, a set of end-user combined services using different technologies, such as GBAS, SBAS and Inertial Systems, will allow the deployment of added value services resulting in an overall enhanced navigation performance. The use of inertial aiding and coasting of the Galileo or Galileo/GPS receivers using low cost MEMS miniature Inertial Measurement Units (IMU), which can be seamlessly and transparently integrated into GNSS receiver antennas, will significantly contribute to reach improved performances. Hence, new perspectives for future generation of receivers will be open. In this paper we present the results achieved using tightly coupled architecture, also termed deeply coupled, under different scenarios, using aiding and coasting techniques for Galileo signals. Aiding refers to the use of inertialderived position and velocity to aid the receiver tracking loops. Coasting refers to the use of inertial-derived position and velocity for short periods of time due to signal outages. The superior performance of such architecture is specially suited for receivers operating in demanding environments; for instance, urban scenarios, where signal blockage is frequent, and high dynamics, such as accelerating trains. Also important is the contribution in the reduction of the total error budget and increased robustness of satellite signal tracking, ultimately allowing to explore new applications and new possibilities of GNSS. The work is a follow-up of the IADIRA study for the Galileo Joint Undertaking 2nd Call, conducted by DEIMOS Engenharia and the Institute of Geomatics. The hybrid receiver has been implemented in the GRANADA software receiver, and further testing activities have been performed with new data and longer simulations, allowing to quantify how a higher level of integration can lead to better results, including increasing the GNSS output frequency to reduce both filter stabilisation period and navigation solution divergence.
Published in:	Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007) September 25 - 28, 2007 Fort Worth Convention Center Fort Worth, TX
Pages:	2778 - 2786
Cite this article:	Silva, Pedro F., Silva, Joao S., Lorga, Jose F.M., Fernandez, Antonio, Diez, Jose, Wis, Mariano, Pares, M. Eulalia, Colomina, Ismael, "Evaluating Receiver Architectures for Inertial Aiding and Coasting," Proceedings of the 20th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2007), Fort Worth, TX, September 2007, pp. 2778-2786.
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