The road side data exchange device includes a positioning system for receiving {HEAD ~ satellite data} regularly, a calculator for calculating {TAIL ~ a calibration value} of the satellite data to generate an analyzed result data, and a database for storing the analyzed result data 
The road side data exchange device includes a positioning system for receiving { HEAD ~ satellite data } regularly , a calculator for calculating { TAIL ~ a calibration value } of the satellite data to generate an analyzed result data , and a database for storing the analyzed result data
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