NetModule NB224x, User Manual

Page: 89 / 99

User Manual NetBox Wireless Router
89/99
4-Jan-10
manual_netbox_e
4 Software Interfaces
4.1 GPS Server
4.1.1 Berlios GPS Server
This is a TCP server which provides GPS data in various format. Find more information under
http://gpsd.berlios.de
4.1.2 NetModule GPS Server
If valid GPS data is available it will be sent as UDP Payload to the configured host. The content is separated
into two lines. The first line contains data in the GPGGA format; the second line contains GPRMC data.
4.1.2.1 $GPGGA - Global Positioning System Fix Data
Format: $GPGGA,<time>,<latitude>,<longitude>,<quality>,<satellites>,0,<sealevel>,,*<CS><CR><LF>
Sample Data: $GPGGA,154250,4749.8678,N,00871.8469,E,1,06,0.0,498,M,0.0,M,,*6A <CR><LF>
No. Name Data Description
1 Sentence Identifier $GPGGA Global Positioning System Fix Data
2 Time <time> UTC of position fix
3 Latitude <latitude,N/S> Latitude of fix
4 Longitude <longitude,E/W> Longitude of fix
5 Fix Quality <quality> 0 = Invalid
1 = GPS fix
6 = estimated
6 Number of Satellites <satellites> Number of satellites in view
7 Horizontal Dilution of Precision
(HDOP) 0.0 Not available (Value = 0)
8 Altitude <sealevel,M> Meters above mean sea level
9 Height of geoid above WGS84 ellip-
soid 0.0,M Not available (Value = 0)
10 Time since last DGPS update blank No last update
11 DGPS reference station id blank No station id
12 Checksum *<CS> Used by program to check for transmis-
sion errors
13 White spaces <CR><LF> Carriage return and line feed