GPS World

Tag: PPP corrections

  • Rx Networks TruePoint.io global PPP corrections now quad-constellation

    Rx Networks TruePoint.io global PPP corrections now quad-constellation

    Logo: Rx NetworksRx Networks TruePoint.io global precise point positioning (PPP) correction service now provides quad-constellation support.

    More mobile devices are integrating multi-constellation GNSS chipsets for better positioning. With quad-constellation expanded multi-constellation support, Rx Networks TruePoint.io global precise point positioning (PPP) correction service unlocks that accuracy, providing global PPP corrections for every major GNSS constellation those chips can track.

    TruePoint.io global PPP originally delivered GPS and GLONASS corrections. Now, it also provides corrections for Galileo and BeiDou. Mass-market multi-constellation GNSS chipsets can now augment all their satellite measurements with accuracy and fully leverage their positioning capabilities with quad-constellation support.

    Consumer devices now have the potential to achieve 50-cm position accuracy when using Rx Networks services for any of the four GNSS constellations. Other internet of things (IoT) and infrastructure applications that do not require real-time positioning can realize 10-cm accuracy in a variety of environments.

    Multi-constellation correction capability ushers in new possibilities and use cases for the connected receiver, according to Rx Networks.

    TruePoint.io remains ubiquitous and as flexible as possible to GNSS chipsets using industry standard formats, and is also receptive to custom integration services for unique usage scenarios. By offering PPP and other high accuracy services in a variety of data standards, TruePoint.io empowers telecom providers with a straightforward approach to integrating high- accuracy services that provide more value to their client devices, and propels the development of exciting new use cases.

    “With this new expansion of TruePoint.io, applications already serviced by Rx Networks can accelerate their market growth objectives with better accuracy and precision using constellations ideal for target regions,” said Vincent Chen, product manager of Truepoint.io. “Being able to deliver global PPP corrections for GPS, GLONASS, Galileo and BeiDou also sets the stage for the addition of more constellations like QZSS. Stay tuned.”

  • Enhanced navigation, robustness, safety for autonomous vehicles

    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.