Campbell GPS16X-HVS Instrukcja Obsługi Pobierz pdf (Strona 10)

GPS16X-HVS GPS Receiver

3. GPS Data

The GPS16X-HVS has several data formats available. The GPS16X-HVS is

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

possible to configure the GPS16X-HVS to output other NMEA strings

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

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

$GPGGA

NMEA string identifier

hhmmss

UTC of Position: Hours, minutes, seconds

1111.111

Latitude: Degrees, minutes, thousandths of minutes

N (North) or S (South)

nnnnn.nnn

Longitude: Degrees, minutes, thousandths of minutes

E (East) or W (West)

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

zzzz

Differential Reference Station ID (0000 to 1023)

Asterisk, generally used as the termination character

Checksum

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 ... 29 30

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