Analytical Method Study of Different Format Data Stream Based on ASCII

The USA National Marine Electronics Association developed a set of universal ASCII DATA Format ,the NMEA protocol for the establishment of a unified RTCM naviga-tion device (RTCM ) standard in GPS (Global Positioning System ) .At present a lot of wire-less communications equipment interface and communication protocol according to the format of NM EA-0183 .By studing on ASCII serial communication in the real-time data stream for-mat and the method of resolving real time data ,and ,writing the program of the method on the platform of VC+ + 2008 ,this paper can povide some help for the accurate real time data acquisition in satellite navigation and positioning .