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Enhanced navigation, robustness, safety for autonomous vehicles

September 17, 2018  - By
Image: GPS World

By Sam Pullen, Stanford University; Jim Kilfeather, Jim Goddard, Tom Nowitzky, Brinda Shah, Wen Doong, David Kagan, and Kerry Greer, Globalstar. To be presented at ION-GNSS+ 2018.

Globalstar is developing a connected car program for continuous, worldwide service to vehicles via satellite and terrestrial communications links.

This combines PPP corrections provided globally by the second-generation Globalstar low-Earth orbit (LEO) constellation with local-area corrections via LTE cellular signals in urban areas for connectivity anytime, anywhere. Both signals are broadcast at 2.4 GHz and include pilot channels used for ranging, augmenting GNSS ranging and providing robustness against jamming and spoofing.

The program provides enhanced navigation via continuous augmentation of GNSS with data derived from ground-based reference networks for sub-meter accuracy and integrity bounds on navigation errors to probabilities as low as 10-9 per operation. When this is combined with other on-board sensors and data such as lidar, radar, optics and IMUs, it will be possible to operate autonomously under almost all conditions with a very high degree of safety.

The key is combined use of PPP corrections globally and local-area CDGNSS/RTK corrections in high-density urban regions where it is economically beneficial. Both sets of augmentations are made available to vehicles. The global approach on the left side of the figure is primary, given its near-worldwide coverage based on the LEO satellite network broadcasting corrections within its licensed communications spectrum at 2.4 GHz. The P/N-modulated pilot component of the Globalstar satellite signals will be used for ranging to augment GNSS and provide additional robustness to RF interference or spoofing at GNSS frequencies.

The paper will be given at ION GNSS+ 2018 and later be available here.

For more ION GNSS+ news, see our page here.