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Despite the prevalence of GPS services, they still suffer from intermittentpositioning with poor accuracy in partially shadowed regions like urbancanyons, flyover shadows, and factories' indoor areas. Existing wisdom relieson hardware modifications of GPS receivers or power-hungry infrastructuresrequiring continuous plug-in power supply which is hard to provide in outdoorregions and some factories. This paper fills the gap with GPSMirror, the firstGPS-strengthening system that works for unmodified smartphones with theassistance of newly-designed GPS backscatter tags. The key enabling techniquesin GPSMirror include: (i) a careful hardware design with microwatt-level powerconsumption that pushes the limit of backscatter sensitivity to re-radiateextremely weak GPS signals with enough coverage approaching the regulationlimit; and (ii) a novel GPS positioning algorithm achieving meter-levelaccuracy in shadowed regions as well as expanding locatable regions underinadequate satellites where conventional algorithms fail. We build a prototypeof the GPSMirror tags and conduct comprehensive experiments to evaluate them.Our results show that a GPSMirror tag can provide coverage up to 27.7 m.GPSMirror achieves median positioning accuracy of 3.7 m indoors and 4.6 m inurban canyon environments, respectively.

GPSMirror: Expanding Accurate GPS Positioning to Shadowed and Indoor Regions with Backscatter