nmea数据如下： $GPGGA,121252.000,3937.3032,N,11611.6046,E,1,05,2.0,45.9,M,-5.7,M,0000*77 $GPRMC,121252.000,A,3958.3032,N,11629.6046,E,15.15,359.95,070306,A*54 $GPVTG,359.95,T,M,15.15,N,28.0,K,A*04 $GPG