EC20模块GPS功能的AT指令顺序
1.AT串口（波特率9600）输入“AT+QGPS=1”，启动GPS获取。（室外，大概一分钟）NMEA串口（波特率9600）拿到的数据：（1次/s）$GPGSV,5,1,20,01,69,037,33,03,29,136,34,05,27,06,24*7E$GPGSV,5,2,20,07,28,196,45,08,22,067,36,14,49,322,34,17,31,288,32*79$GPGSV,5,3,20,19,10,271,41,21,43,040,26,22,37,102,38,2
