Due to its requirements for well-positioned base stations and lengthy times-to-first-fix, the Precise Point Positioning (PPP) techniques for decimeter positioning haven't found widespread application in navigation in smartphones. In principle, a global network of PPP base stations can provide decimeter-level accuracy to various positioning applications, including smartphone-based navigation. However, a global network of PPP base stations that can monitor and gather satellite information is expensive to build and maintain. This disclosure describes a crowdsourced, dense, PPP network and ephemeris-coverage map that can enable GNSS chipsets (e.g., utilized in smartphones and other mobile devices) to obtain decimeter-level positioning accuracy.
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Malkos, Steve and Diggelen, Frank van, "A Crowdsourced GNSS and PPP Reference Network", Technical Disclosure Commons, (August 02, 2021)