Table of Contents
Advertisement
13. GPS
The MTX-Java-IoT ordered with GPS option (2G/GPS or 3G/GPS) has an internal GPS receiver which
offers the full performance of GPS technology. The GPS receiver continuously tracks all satellites in view,
thus providing accurate satellite positioning data.
13.1 GPS antenna connector
The antenna connector allows for the transmission of radio frequency (RF) signals between the modem
and an external customer-supplied antenna. The modem is fitted with a 50Ω, SMA F coaxial jack.
It is possible to connect active or passive GPS antennas. In either case they must have 50 Ohm impedance.
13.2 GPS application interface
The MTX-Java-IoT has an internal GPS receiver which offers the full performance of GPS technology. The
GPS receiver continuously tracks all satellites in view, thus providing accurate satellite positioning data.
The GPS receiver supports the NMEA protocol via serial port (RS232/RS485) and USB interface. It is
able to recognize input messages from any of these protocols (e.g., GGA, RMC GSA, GSV) and respond to
them accordingly. Input messages can be arbitrarily mixed.
The NMEA protocol is an industry standard protocol developed for marine electronics. It was originally
designed to allow data exchange between various sensors and navigation equipment aboard ships.
Nowadays, it is a de-facto standard for GPS receiver data output. For more information on the NMEA
Standard please refer to www.nmea.org.
13.3 GPS antenna interface characteristics
Depending on the receiver's knowledge of last position, current time and ephemeris data, the receiver's
startup time (TTFF) may vary: if the receiver has no knowledge of its last position or time, a startup takes
considerably longer than if the receiver has still knowledge of its last position, time and almanac or has
still access to valid ephemeris data and the precise time.
MTX-Java-IoT | 2018/2
MTX © by MATRIX ELECTRONICA S.L.U.
SUPPORT: iotsupport@mtxm2m.com | SALES: info@mtxm2m.com |
mtxm2m.com
77
Advertisement
Table of Contents
