Analysis and processing of GPS data format [easy to understand]

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GPS The output statements of the receiver are ：GPGGA,GPRMC,GPVTG,GPGSV,

1.$GPGGA,GPS Fix data Output statement

Its standard format is ：

$GPGGA,(1),(2),(3),(4),(5),(6),(7),(8),(9),M,(10),M,(11),(12)＊hh(CR)(LF)

With $GPGGA,082006.000,3852.9276,N,11527.4283,E,1,08,1.0,20.6,M,,,,0000*35 For example , The meaning of each part is as follows ,

(1) location UTC Time ：08 when 20 branch 06 second

(2) latitude ( Format ddmm.mmmm: namely dd degree ,mm.mmmm branch );

(3) N/S( North or south latitude )： North latitude 38 degree 52.9276 branch ;

(4) longitude ( Format dddmm.mmmm： namely ddd degree ,mm.mmmm branch );

(5) E/W( East or west longitude )： East longitude 115 degree 27.4283 branch ;

(6) Quality factor (0= No location ,1= real time GPS,2= Difference GPS)：1= real time GPS;

(7) Number of satellites available (0～8)： Number of satellites available =08;

(8) Horizontal accuracy factor (1.0～99.9); Horizontal accuracy factor =1.0;

(9) Antenna elevation ( The sea level ,－9999.9～99999.9, Company ：m); Antenna elevation =20.6m);

(10) The height of the ellipsoid relative to sea level (－999.9～9999.9, Company ：m): nothing ;

(11) Difference GPS Data age , real time GPS No time : nothing ;

(12) Differential reference station No (0000～1023), real time GPS No time : nothing ;

＊ Checksum field ;hh Checksum :35(CR)(LF) enter , Line break .

2. $GPRMC,GPS Recommended location information

Its standard format is ：

$GPRMC,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11><CR><LF>

With $GPRMC,082006.000,A,3852.9276,N,11527.4283,E,0.00,0.0,261009,,*38 For example , The semantics of each part are as follows ,

(1) Standard positioning time （UTC time） Format ： Every minute . Seconds seconds seconds seconds （hhmmss.sss）.

(2) Positioning status ,A = Data available ,V = Data not available .

(3) latitude , Format ： Degrees and minutes . Minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute （ddmm.mmmm）.

(4) Latitude distinction , Northern Hemisphere （N） Or the southern hemisphere （S）.

(5) longitude , Format ： Degrees and minutes . Minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute minute .

(6) Longitude discrimination , In the east （E） Hemisphere or Western （W） hemisphere .

(7) Relative displacement velocity , 0.0 to 1851.8 knots

(8) Relative displacement direction ,000.0 to 359.9 degree . actual value .

(9) date , Format ： Day after day, month after month, year after year （ddmmyy）.

(10) Pole variable ,000.0 to 180.0.

(11) Degrees .

(12) Checksum.( Check position )

3. $GPVTG,GPS Ground speed information

Its standard format is ：

$GPVTG,<1>,T,<2>,M,<3>,N,<4>,K,<5>*hh

With $GPVTG,0.0,T,,M,0.00,N,0.0,K*50 For example , The semantics of each part are as follows ,

<1> Ground course with true north as reference (000~359 degree , Ahead 0 Will also be transmitted )

<2> Ground course with magnetic north as reference (000~359 degree , Ahead 0 Will also be transmitted )

<3> Ground speed (000.0~999.9 section , Ahead 0 Will also be transmitted )

<4> Ground speed (0000.0~1851.8 km / Hours , Ahead 0 Will also be transmitted )

<5> Mode indication ( only NMEA0183 3.00 Version output ,A= Self positioning ,D= Difference ,E= Estimate ,N= Invalid data )

4. $GPGSV,GPS Visual satellite status output statement

Its standard format is ：

$GPGSV,(1),(2),(3),(4),(5),(6),(7),…(4),(5),(6),(7)*hh(CR)(LF)

With $GPGSV,2,1,08,06,33,240,45,10,36,074,47,16,21,078,44,17,36,313,42*78 For example , The semantics of each part are as follows ,

(1) The total GSV The number of sentence messages ;2;

(2) At present GSV Statement number :1; 　　

(3) The total number of visual satellites :08; 　　

(4) Satellite :06; 　　

(5) Elevation (00～90 degree ):33 degree ; 　　

(6) azimuth (000～359 degree ):240 degree ; 　　

(7) Signal-to-noise ratio (00～99dB):45dB( The following is... In turn 10,16,17 Information from satellite ); 　　

* Checksum field ;　　

hh Checksum :78; 　　

(CR)(LF) enter , Line break . 　　

notes ： Each statement contains information about up to four satellites , The information of each satellite has four data items , namely ：　　

(4)－ Satellite ,(5)－ Elevation ,(6)－ azimuth ,(7)－ Signal-to-noise ratio .

5. $GPGSA,GPS Current satellite information

Its standard format is ：

$GPGSA,<1>,<2>,<3>,<3>,,,,,<3>,<3>,<3>,<4>,<5>,<6>,<7>

<1> Pattern ：M = Manual , A = Automatically .

<2> Positioning type 1 = Not located , 2 = Two dimensional positioning , 3 = Three dimensional positioning .

<3>PRN Numbers ：01 to 32 Table number of satellites in use in the sky , Up to 12 Satellite information .

<4> PDOP Position accuracy factor (0.5~99.9)

<5> HDOP Horizontal accuracy factor (0.5~99.9)

<6> VDOP Vertical precision factor (0.5~99.9)

<7> Checksum.( Check position ).

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