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ALS3-US R4 Hardware Interface Overview
4 GNSS Receiver
27
ALS3-USR4_HIO_v03.915
2017-03-27
Confidential / Preliminary
Page 27 of 44
4
GNSS Receiver
ALS3-US R4 integrates a GNSS receiver that offers the full performance of GPS/GLONASS/
Galileo technology. The GNSS receiver is able to continuously track all satellites in view, thus
providing accurate satellite position data.
Galileo technology. The GNSS receiver is able to continuously track all satellites in view, thus
providing accurate satellite position data.
The integrated GNSS receiver supports the NMEA protocol via USB or ASC0 interface. NMEA
is a combined electrical and data specification for communication between various (marine)
electronic devices including GNSS receivers. It has been defined and controlled by the US
based National Marine Electronics Association. For more information on the NMEA Standard
please refer to http://www.nmea.org.
is a combined electrical and data specification for communication between various (marine)
electronic devices including GNSS receivers. It has been defined and controlled by the US
based National Marine Electronics Association. For more information on the NMEA Standard
please refer to http://www.nmea.org.
Depending on the receiver’s knowledge of last position, current time and ephemeris data, the
receiver’s startup time (i.e., TTFF = Time-To-First-Fix) may vary: If the receiver has no knowl-
edge 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.
receiver’s startup time (i.e., TTFF = Time-To-First-Fix) may vary: If the receiver has no knowl-
edge 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.
By default, the GNSS receiver is switched off. It has to be switched on and configured using AT
commands. For more information on how to control the GNSS interface via the AT commands
see
commands. For more information on how to control the GNSS interface via the AT commands
see