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US20160320491A1   [0013] 

Understanding GPS Principles and Applications   [0003] 
Indoor Positioning Using GPS Revisited   [0011] 
GNSS Repeater Based Approach for Indoor Positioning: Current Status   [0013] 
Indoor Navigation System using Asyn-chronous Pseudolites   [0013] 
Phased array antenna handbook   [0027] 
Optimizing the directivity diagram of underwater acoustic wide band antennas   [0027]