Office for Technology Commercialization

Vehicle Navigation During GPS Outages Using Differential GPS Augmentation

Technology #20100049

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DGPS Augmentation SystemGPS OutagesDGPS Augmented System
Max Donath, PhD Director, Intelligent Transportation Systems Institute
Dr. Donath is a renowned researcher and professor at the University of Minnesota, as well as director of the Intelligent Transportation Systems Institute. The ITS Institute, under his direction since 1997, pursues research in the areas of human performance and behavior, driver interfaces, sensors, vehicle and traffic controls, communications, and traffic modeling and simulation—developing new approaches for confronting difficult transportation issues. His focus lies in the integration of sensors, intelligence, and motor control to provide machines with human-like functions.
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Craig Shankwitz, PhD
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Andrew Morrow
Technology Licensing Officer
Patent Protection


US Patent Pending 2011-0153266

Differential GPS Augmentation Improves Vehicle Navigation

The augmented differential GPS (DGPS) system combines hardware and software to maintain positional vehicle accuracy for navigation and is highly accurate, fast, and a low-cost method to maintain navigation during GPS outage. This system employs a simple, reliable method of guiding vehicles when the GPS signal is unavailable. The DGPS system uses direct measures of ground velocity, a measure of yaw rate, and an accurate estimate of the vehicle position and heading at the time the GPS signal is lost to estimate the current vehicle position. The key to DGPS augmentation is an accurate estimation of the vehicle positioning and heading at the time the GPS signal is lost.

Note: The augmented differential GPS technology has been exclusively licensed. If you have questions, please contact the University of Minnesota's Office for Technology Commercialization.

DGPS Augmentation System

The DGPS Augmentation System directly measures ground vehicle velocity using a sensor that is not susceptible to drift, but accurately measures vehicle velocities in two dimensions. The DGPS Augmentation System utilizes an array of less expensive 2D velocity sensors to provide yaw rate estimates. Multiple sensors also provide a more accurate measure of ground velocity than a single, expensive sensor. The system’s engineering principles successfully eliminates bias and heading errors, and addresses initial and integration errors.


  • More Affordable--utilizes multiple less expensive sensors which provide a more accurate ground velocity measure than a single, expensive sensor.
  • Accurate--eliminates bias errors and greatly reduces drift.
  • Improves GPS Reliability--compensates for GPS outages that occur in tunnels, under long bridges, under trees, and in congested cities.