Linx-technologies RXM-GPS-R4 Bedienungsanleitung PDF herunterladen (Seite 9)

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NMEA Output Messages

The following sections outline the data structures of the various NMEA

messages that are supported by the module. By default, the commands

are at 9,600bps, 8 data bits, 1 start bit, 2 stop bits, and no parity.

GGA – Global Positioning System Fixed Data

Figure 8 contains the values for the following example:

$GPGGA,053740.000,2503.6319,N,12136.0099,E,1,08,1.1,63.8,M,15.2,M,,0000*64

Global Positioning System Fixed Data Example

Name Example Units Description

Message ID $GPGGA GGA protocol header

UTC Time 053740.000 hhmmss.sss

Latitude 2503.6319 ddmm.mmmm

N/S Indicator N N=north or S=south

Longitude 12136.0099 dddmm.mmmm

E/W Indicator E E=east or W=west

Position Fix Indicator 1 See Figure 9

Satellites Used 08 Range 0 to 12.

HDOP 1.1 Horizontal Dilution of Precision

MSL Altitude 63.8 meters

Units M meters

Geoid Separation 15.2 meters

Units M meters

Age of Diff. Corr. second Null ﬁelds when DGPS is not used

Diff. Ref. Station 0000

Checksum *64

<CR> <LF> End of message termination

Figure 8: Global Positioning System Fixed Data Example

Position Indicator Values

Value Description

0 Fix not available or invalid

1 GPS SPS Mode, ﬁx valid

2 Differential GPS, SPS Mode, ﬁx valid

3–5 Not supported

6 Dead Reckoning Mode, ﬁx valid

Figure 9: Position Indicator Values

GLL – Geographic Position – Latitude / Longitude

Figure 10 contains the values for the following example:

$GPGLL,2503.6319,N,12136.0099,E,053740.000,A,A*52

GSA – GPS DOP and Active Satellites

Figure 11 contains the values for the following example:

$GPGSA,A,3,24,07,17,11,28,08,20,04,,,,,2.0,1.1,1.7*35

GPS DOP and Active Satellites Example

Name Example Units Description

Message ID $GPGSA GSA protocol header

Mode 1 A See Figure 12

Mode 2 3 1=No ﬁx, 2=2D, 3=3D

ID of satellite used 24 Sv on Channel 1

ID of satellite used 07 Sv on Channel 2

... ...

ID of satellite used Sv on Channel 12

PDOP 2.0 Position Dilution of Precision

HDOP 1.1 Horizontal Dilution of Precision

VDOP 1.7 Vertical Dilution of Precision

Checksum *35

<CR> <LF> End of message termination

Figure 10: Geographic Position – Latitude / Longitude Example

Geographic Position – Latitude / Longitude Example

Name Example Units Description

Message ID $GPGLL GLL protocol header

Latitude 2503.6319 ddmm.mmmm

N/S Indicator N N=north or S=south

Longitude 12136.0099 dddmm.mmmm

E/W Indicator E E=east or W=west

UTC Time 053740.000 hhmmss.sss

Status A A=data valid or V=data not valid

Mode A

A=autonomous, D=DGPS, N=Data

not valid

Checksum *52

<CR> <LF> End of message termination

Figure 11: GPS DOP and Active Satellites Example

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 18 19

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