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gpsd版本3.22，使用gpsfake模拟gps数据，gpsfake -D3 -t -S nmea.log
按照read_gps_data.c源代码，读取gps数据，gps_data.fix.status一直是0，为什么呢？nmea.log中的数据已经是fix过后的数据了，以下是一段gps数据，GNGGA的第7个字段是1，表示fix过后了
$GNGGA,104006.000,5136.9209,N,00011.1120,W,1,9,1.17,83.4,M,47.0,M,,60
$GPGSA,A,3,04,09,19,11,06,,,,,,,,1.43,1.17,0.830B
$GLGSA,A,3,68,69,85,78,,,,,,,,,1.43,1.17,0.8317
$GNRMC,104006.000,A,5136.9209,N,00011.1120,W,0.00,191.54,161022,,,A6E
$GNZDA,104006.000,16,10,2022,,4F
$GPGRS,104006.000,1,-9.50,-1.69,-17.7,-2.85,-10.3,-0.54,4.08,-0.79,3.41,,,45
$GPGST,104006.000,6.3,8.8,2.8,16.0,8.5,3.6,237B
$GNGGA,104007.000,5136.9209,N,00011.1120,W,1,9,1.17,83.4,M,47.0,M,,61
$GPGSA,A,3,04,09,19,11,06,,,,,,,,1.43,1.17,0.830B
$GLGSA,A,3,68,69,85,78,,,,,,,,,1.43,1.17,0.8317
$GNRMC,104007.000,A,5136.9209,N,00011.1120,W,0.00,191.54,161022,,,A*6F
$GNZDA,104007.000,16,10,2022,,*4E
$GPGRS,104007.000,1,0.87,-1.94,-18.0,-1.19,-11.9,-0.18,3.93,-1.62,7.08,,,62
$GPGST,104007.000,6.3,9.0,3.0,15.6,8.7,3.8,2373