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Dive into the research topics where Sergei Podshivalov is active.

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Featured researches published by Sergei Podshivalov.


ieee/ion position, location and navigation symposium | 2016

On the feasibility of cm-accurate positioning via a smartphone's antenna and GNSS chip

Todd E. Humphreys; Matthew Murrian; Frank van Diggelen; Sergei Podshivalov; Kenneth M. Pesyna

The feasibility of centimeter-accurate carrier-phase differential GNSS (CDGNSS) positioning using a smartphones internal GNSS antenna and GNSS chip is investigated. Precise positioning on a mass-market platform would significantly influence the world economy, ushering in a host of consumer-focused applications that have so far been hampered by the several-meter-level errors in traditional GNSS positioning. Previous work has shown that GNSS signals received through a mass-market smartphones GNSS antenna can be processed to yield a centimeter-accurate CDGNSS position solution, but this earlier work processed all GNSS signals externally to the smartphone. The question remains whether a smartphones internal oscillator and GNSS chip can produce observables of sufficient quality to support centimeter-accurate carrier-phase-based positioning. This paper answers the question by accessing and processing the raw code- and carrier-phase observables produced by a mass-market smartphone GNSS chip - observables that have heretofore been unavailable to the research community. The phones carrier phase measurements are shown to suffer from five anomalies compared to those from a survey-grade GNSS receiver, four of which are readily fixed in post-processing. The remaining anomaly, an error in the phase measurement that grows approximately linearly with time, currently prevents the phones phase measurements from satisfying the conditions for CDGNSS positioning. But the phones measurements seem otherwise fully capable of supporting cm-accurate carrier-phase differential GNSS positioning. A separate analysis of a smartphones GNSS signal strength dependency on azimuth and elevation reveals that multipath-induced deep fading and large phase errors remain a significant challenge for centimeter-accurate smartphone positioning.


Archive | 2007

Method and system for determining time in a satellite positioning system

Charles Abraham; Sergei Podshivalov; Frank van Diggelen


Archive | 2003

Method and apparatus for performing signal correlation

Charles Abraham; Serge de la Porte; Sergei Podshivalov


Archive | 2004

Method and apparatus for processing location service messages in a satellite position location system

Charles Abraham; Sergei Podshivalov


Archive | 2009

Method and apparatus for enhanced autonomous gps

Frank van Diggelen; Sergei Podshivalov; Charles Abraham


Archive | 2004

Method and apparatus for tagging digital photographs with geographic location data

Charles Abraham; Sergei Podshivalov


Archive | 2006

Method and apparatus for mitigating multipath effects at a satellite signal receiver using a sequential estimation filter

Frank van Diggelen; Charles Abraham; Sergei Podshivalov


Archive | 2006

Method and apparatus for generating and securely distributing long-term satellite tracking information

Matthew Riben; Sergei Podshivalov; Frank van Diggelen; Charles Abraham


Archive | 2004

Method and apparatus for distribution of satellite navigation data

Sergei Podshivalov; Charles Abraham


Archive | 2005

Multi-function appliance for a satellite navigation data distribution system

Charles Abraham; Steven Malkos; Sergei Podshivalov

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Kenneth M. Pesyna

University of Texas at Austin

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Matthew Murrian

University of Texas at Austin

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Todd E. Humphreys

University of Texas at Austin

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