GPS World, February 2012
Satellites Buildings SPP Solu on Candidate User Loca ons Along street COVER STORY Personal Navigation Shadow Matching Improved GNSS Accuracy in Urban Canyons Across street Signals blocked Signals available Signals available Signals blocked GNSS positioning in dense urban areas is unreliable with accuracy particularly poor in the cross street direction One solution is shadow matching a new positioning technique that uses 3D building models to predict which satellites are visible from different locations and compares this with the measured satellite visibility to determine position This article presents test results of a preliminary shadow matching algorithm in a London urban canyon and discusses the practical implementation of the technique Paul D Groves Lei Wang and Marek K Ziebart P FIGURE 1 SHADOW MATCHING The two GNSS mobile phones beside the middle one show additional possible user positions referenced by the along street component of the standard point positioning SPP solution GPS World February 2012 www gpsworld com 14
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