Location Corrections Through Differential Networks System

electrical and electronics
Location Corrections Through Differential Networks System (LAR-TOPS-296)
Improving the Global Positioning System (GPS) positioning accuracy for internet capable mobile devices
In recent years, the development and use of internet enabled mobile devices with built in GPS receivers (e.g. cell phones, tablet computers) have seen substantial increases. Correspondingly, the quantity and variety of applications using the GPS capabilities of these devices have also increased. However, one limiting factor for some desired uses, such as establishing drop zones for package delivery, is that these devices typically have limited precise positioning capabilities due to minimizing Size, Weight, Power and Cost (SWaP-C) for their GPS antennas and chip sets. Research suggests that the expected positional accuracy for a typical mobile device (cell phone or tablet computer) is around 3-10 meters, which is prohibitive for applications that require higher precision.

The Technology
The system is designed to work with any internet enabled mobile device that has access to its GPS pseudorange, code phase and potentially carrier phase measurements. The system makes use of GPS measurements or corrections obtained from a stationary base station to refine its positioning estimate using established computational techniques such as those associated with differential GPS, Real-Time Kinematic (RTK) GPS and/or the Local Area Augmentation System (LAAS). The location information from mobile and fixed base signals can be integrated using established such as those used for differential GPS, Such methods remove errors common to the measurements of both devices (the mobile and base station) thereby increasing accuracy of the mobile device position estimates.
The mobile device refines its position estimates using unprocessed measurements retransmitted by the base station. 
Image Credit: NASA
  • Supports 1-meter positional accuracy systems
  • May be independent of existing CORs or NTRIPS systems
  • May be operational in areas outside of existing systems

  • Utilizing a mobile phone to GPS-mark a location i.e. Drone based package delivery
  • e911 calls that provide accurate GPS locations for first responders
Technology Details

electrical and electronics
LAR-18969-1 LAR-19365-1
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