NetComm NTC-400 Series User Manual page 335

Type Description
RMC Recommended
Minimum Data
VTG Vector Track
and Speed Over
the Ground
SBAS
SBAS is Satellite-Based Augmentation Systems that is used to improve the accuracy of location data. There are several SBAS
systems for different areas in the world.
EGNOS
WAAS
GAGAN
MSAS
Assisted GPS
Assisted GPS (as known as A-GPS) is used for speeding up location fixing, especially when the satellite signal is weak. If
activating this option, the NTC-400 Series Router will download almanac data from an A-GPS server through the IP network
instead of from the satellite. You can also choose a different valid period of almanac data. Almanac data with a shorter valid
period will result in higher accuracy. However, almanac data with a shorter valid period needs to be updated more
frequently, consuming more network bandwidth.
Data to Storage
Besides transmitting location data to a remote server, you can also store location data on internal storage (e.g. microSD card)
or external storage (e.g. USB drive). The data format can be NMEA 0183 raw data or GPX file format. The location data will be
saved to a new file if the original file size is bigger than the pre-defined file size. The "Download log file" button allows you to
browse all saved log files and download to your personal devices.
Scenario of location tracking for fleet management
A fleet owner would like to see the locations of his trucks in real time. He also likes to know where his trucks have been with
time information. In his operation office, there is a server (IP: 100.100.100.1) which can interpret NMEA RMC data format
and show the truck's location and track on map. This server is listening on TCP port 888 to receive NMEA RMC packet from
trucks. The IMEI number will be added before NMEA RMC data to identify each truck. Below is the configuration of each
truck.
Basic Settings
Configuration Path
GNSS
GNSS Type
NTC-400 Series
$GPRMC,123519,A,4807.038,N,01131.000,E,022.4,084.4,230394,003.1,W*6A
$GPVTG,054.7,T,034.4,M,005.5,N,010.2,K*48
Table 247 – GPS Message Types
SBAS
Europe
North America
India
Japan
Table 248 – Satellite-Based Augmentation Systems (SBAS)
Enable
GPS
Example
Area Coverage
[GNSS]-[Configuration]
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