Performance Analysis of Precise Point Positioning (PPP) with Rx Networks High Accuracy Assistance Service

Vijaykumar Bellad, Thyagaraja Marathe, Behnam Aminian, Nicholas Valentine, Sabitha Sarvasiddhi, Zahid Baji, Murray Petryshen, Vincent Chen

Abstract:	Precise Point Positioning (PPP) is becoming the technology of choice for emerging high precision applications as the convergence time or time to decimeter accurate fix has improved lately. Recent announcements of dual-frequency chips for mass-market have opened the prospect of precise positioning in low-cost consumer applications. Rx Networks has recently developed a new real-time PPP service targeted at consumer and broad industrial market applications requiring decimeter level accuracy. The multi-constellation corrections service supporting GPS, GLONASS, Galileo and BeiDou improves accuracy, convergence time, availability and integrity. The real-time high accuracy assistance service provides satellite orbit, clock, biases, and ionosphere corrections in standard RTCM SSR format, and a proprietary format for integration with industrial, automotive and mass-market applications. PPP performance is assessed for improvement that could be achieved using Rx Networks real-time corrections streams. This work explores the position accuracy using open source engines to assess benefits solely from the real-time corrections stream accuracy that is hardware agnostic. Further, impact of satellite bias corrections on position accuracy and convergence time is analyzed. Real-time precise positioning performance results are demonstrated using third-party open source PPP engines that accept corrections in standard RTCM SSR format. Positioning tests are performed for stationary and kinematic user scenarios. The stationary results are presented for a global test bed equipped with geodetic grade antennas and receivers. This test demonstrates the availability and accuracy of real-time corrections stream for all active and healthy satellites of a constellation. Kinematic tests are performed to assess position accuracy with multi-band patch and geodetic grade antennas. Both stationary and kinematic tests are performed with PPP algorithm running in kinematic mode to remove the effects of position filtering. Decimeter 95th-percentile accuracy is achieved in a few minutes suggesting usability of Rx Networks’ PPP corrections for several real-world use cases. Accuracy and convergence time will also be tested using a commercial PPP enabled GNSS receiver and the performance results will be presented. Further, accuracy assessment will be explored using observations from a dual-frequency Smartphone and third-party PPP engines. Metrics indicating the service reliability and latency will be included, and wherever possible metrics will be compared against other freely available services, for e.g. from IGS.
Published in:	Proceedings of the 32nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2019) September 16 - 20, 2019 Hyatt Regency Miami Miami, Florida
Pages:	1870 - 1890
Cite this article:	Bellad, Vijaykumar, Marathe, Thyagaraja, Aminian, Behnam, Valentine, Nicholas, Sarvasiddhi, Sabitha, Baji, Zahid, Petryshen, Murray, Chen, Vincent, "Performance Analysis of Precise Point Positioning (PPP) with Rx Networks High Accuracy Assistance Service," Proceedings of the 32nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2019), Miami, Florida, September 2019, pp. 1870-1890. https://doi.org/10.33012/2019.17089
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