IEEE wrote:Japan’s Plan for Centimeter-Resolution GPS
A $1.2 billion system of satellites and ground stations would give unprecedented accuracy
A stranger to Tokyo could easily get lost in its urban canyons. And GPS navigation, stymied by low resolution and a blocked view of the sky, might not be much help. But that won’t be the case after 2018. Engineers at Tokyo-based Mitsubishi Electric Corp. report that they’re on track to start up the first commercial, nationwide, centimeter-scale satellite positioning technology. As well as spot-on navigation, the technology will also usher in a variety of innovative new applications, its proponents say.
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... not sure how higher-resolution GPS would help if the sky is still blocked by those "urban canyons". I wonder if anyone's ever thought about mapping the location and strength of wifi signals and enabling devices to triangulate off that?