Farrell, Jay and Wang Hu
Benefit Summary HTML

A Virtual Network Differential Global Navigation Satellite System (VN-DGNSS) and Single Point Positioning (SPP) approach were tested for how well they achieved the Society of Automotive Engineering (SAE)’s specifications. SAE specifications require 68 percent of horizontal positioning error to be less than 1.5 meters and 68 percent of vertical positioning error to be less than three meters. This study evaluated the implementation of a VN-DGNSS for connected and automated vehicles (CAV) with field tests occurring from March to November 2020. A VN-DGNSS is an enhancement to a primary GNSS system to improve the accuracy of position by using a network of reference stations that broadcast differential information to the user via a client-server architecture. When testing system and lane matching accuracy on a moving vehicle, three receivers were connected to one antenna. One receiver communicated with the VN-DGNSS server to receive real-time correction information. The second receiver operated in SPP mode, without external corrections. The third one was used to support real-time kinematic (RTK) fixed solution to achieve centimeter level accuracy. Researchers drove a vehicle 12 times on a testbed in a parking lot to evaluate positioning performance in the receivers.

Created Date
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Other Reference Number
Report No. CA21-3746
Publication Sort Date
Prepared by University of California, Riverside for the California DOT
Result Type
Network Differential GNSS Corrections for Connected and Autonomous Vehicles
Project Category
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