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