'Centimetre accurate' GPS system could transform virtual reality and mobile devices

Reference: http://www.futuretimeline.net/blog/computers-internet-blog.htm#.VWKCsU-8PGc

  Researchers at the University of Texas at Austin have developed a centimetre-accurate GPS-based positioning system that could revolutionise geolocation on virtual reality headsets, cellphones and other technologies – making global positioning and orientation far more precise than what is currently available on a mobile device.

  The researchers' new system could allow unmanned aerial vehicles to deliver packages to a specific spot on a consumer's back porch, improve collision avoidance technologies on cars and allow virtual reality (VR) headsets to be used outdoors. This ultra-accurate GPS, coupled with a smartphone camera, could be used to quickly build a globally referenced 3-D map of one's surroundings that would greatly expand the radius of a VR game. Currently, VR does not use GPS, which limits its use to indoors and usually a two- to three-foot radius.

  "Imagine games where, rather than sit in front of a monitor and play, you are in your backyard actually running around with other players," said Todd Humphreys, lead researcher and assistant professor in the Department of Aerospace Engineering and Engineering Mechanics. "To be able to do this type of outdoor, multiplayer virtual reality game, you need highly accurate position and orientation that is tied to a global reference frame."

  Humphreys and his team in the Radionavigation Lab have designed a low-cost system that reduces location errors from the size of a large car to the size of a nickel – a more than 100 times increase in accuracy. Humphreys collaborated on the new technology with Professor Robert W. Heath from the Department of Electrical and Computer Engineering, along with graduate students.

  Centimetre-accurate positioning systems are already used in geology, surveying and mapping – but the survey-grade antennas these systems employ are too large and costly for use in mobile devices. This breakthrough by Humphreys and his team is a powerful and sensitive software-defined GPS receiver that can extract centimetre accuracies from the inexpensive antennas found in mobile devices. Such precise measurements were not previously possible. The researchers anticipate that their software's ability to leverage low-cost antennas will reduce the overall cost of centimetre accuracy and make it economically feasible for mobile devices.