Bug #851
硬件已经支持北斗，但cat /dev/ttyS3输出报文数据后没有输出北斗的定位数据（BDGGA），只有北斗的卫星数量与信号值（BDGSV）
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Description
1、所以报文数据如下：
$GNGGA,102236.000,3104.68802,N,12130.73049,E,1,27,0.6,109.1,M,11.5,M,,*43 $GNGLL,3104.68802,N,12130.73049,E,102236.000,A,A*49 $GNGSA,A,3,04,06,09,11,12,14,17,19,20,22,194,195,1.0,0.6,0.8,1*3E $GNGSA,A,3,05,07,08,10,13,19,22,24,26,29,35,38,1.0,0.6,0.8,4*3E $GPGSV,3,1,12,04,22,066,25,06,56,340,37,09,35,099,31,11,39,294,41,0*6C $GPGSV,3,2,12,12,22,309,32,14,13,177,41,17,53,115,22,19,76,060,25,0*61 $GPGSV,3,3,12,20,36,234,41,22,32,192,43,194,42,168,30,195,69,057,28,0*61 $BDGSV,4,1,16,03,51,200,38,05,14,253,39,07,84,216,32,08,57,232,28,0*7A $BDGSV,4,2,16,10,75,292,38,13,47,231,35,19,63,109,24,22,32,187,38,0*74 $BDGSV,4,3,16,24,08,298,38,26,15,251,41,29,40,089,27,35,60,345,28,0*72 $BDGSV,4,4,16,38,73,247,44,40,77,107,27,44,21,306,26,45,06,199,19,0*76 $GNRMC,102236.000,A,3104.68802,N,12130.73049,E,0.00,0.00,260225,,,A,V*05 $GNVTG,0.00,T,,M,0.00,N,0.00,K,A*23 $GNZDA,102236.000,26,02,2025,00,00*4F $GPTXT,01,01,01,ANTENNA OK*35 $GNGGA,102237.000,3104.68802,N,12130.73049,E,1,27,0.6,109.1,M,11.5,M,,*42 $GNGLL,3104.68802,N,12130.73049,E,102237.000,A,A*48 $GNGSA,A,3,04,06,09,11,12,14,17,19,20,22,194,195,1.0,0.6,0.8,1*3E $GNGSA,A,3,05,07,08,10,13,19,22,24,26,29,35,38,1.0,0.6,0.8,4*3E $GPGSV,3,1,12,04,22,066,25,06,56,340,37,09,35,099,31,11,39,294,41,0*6C $GPGSV,3,2,12,12,22,309,32,14,13,177,42,17,53,115,25,19,76,060,25,0*65 $GPGSV,3,3,12,20,36,234,41,22,32,192,43,194,42,168,30,195,69,057,28,0*61 $BDGSV,4,1,16,03,51,200,38,05,14,253,39,07,84,216,33,08,57,232,28,0*7B $BDGSV,4,2,16,10,75,292,38,13,47,231,35,19,63,109,24,22,33,187,39,0*74
2、BD功能定位返回数据，目前北斗的系统数据定位信息会被汇总到GNGGA信息中，而GNGGA是综合的定位数据其中包括（GPS、HLONASS和北斗）BD也会输出单独的BDGSV语句，表示北斗的可见卫星数量与信号质量。
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