Campbell-scientific GPS16-HVS Garmin GPS Receiver Manuel d'utilisateur télécharger pdf (Page 10)

Garmin 16-HVS GPS Receiver

3. GPS Data

The Garmin16-HVS has several data formats available. The Garmin16-HVS is

configured to output the NMEA $GPGGA time and position string. It is

possible to configure the Garmin16-HVS to output other NMEA strings

including the $GPVTG track made good and ground speed string. See

Appendix D for details.

Sample NMEA $GPGGA data string:

$GPGGA,hhmmss,llll.lll,a,nnnnn.nnn,b,t,uu,v.v,w.w,M,x.x,M,y.y,zzzz*hh<CR><LF>

TABLE 3-1. NMEA $GPGGA String Definition

Field Description

0 $GPGGA NMEA string identifier

1 hhmmss UTC of Position: Hours, minutes, seconds

2 1111.111 Latitude: Degrees, minutes, thousandths of minutes

3 a N (North) or S (South)

4 nnnnn.nnn Longitude: Degrees, minutes, thousandths of minutes

5 b E (East) or W (West)

6 t

GPS Quality Indicator: 0 = No GPS, 1 = GPS, 2 =

DGPS

Number of Satellites in Use

v.v

Horizontal Dilution of Precision (HDOP)

w.w

Antenna Altitude in Meters

M = Meters

x.x

Geoidal Separation in Meters

M = Meters. Geoidal separation is the difference

between the WGS-84 earth ellipsoid and mean-sea-

level.

y.y

Age of Differential GPS Data. Time in seconds since

the last Type 1 or 9 Update

14 zzzz Differential Reference Station ID (0000 to 1023)

15 * Asterisk, generally used as the termination character

16 hh Checksum

17 <CR><LF> Carriage return, line feed characters.

Sample $GPGGA output strings:

Cold Start

No satellites acquired, Real Time Clock and Almanac invalid:

$GPGGA,,,,,,0,00,,,,,,,*66

Warm Start

No satellites acquired, time from Real Time Clock, almanac valid:

$GPGGA,235032.0,,,,,0,00,,,,,,,*7D

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 31 32

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