Communication with {HEAD ~ the nearest road side data exchange device} is performed via {TAIL ~ a preset communication protocol} to acquire the satellite calibration data 
Communication with { HEAD ~ the nearest road side data exchange device } is performed via { TAIL ~ a preset communication protocol } to acquire the satellite calibration data
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH