4. PRODUCT FEATURES
Multi-Constellation Navigation (SL869-V2 and SL869L-V2
only)
GPS and GLONASS constellations are enabled by default. Enabling BeiDou disables
GLONASS and Galileo.
The user may enable or disable constellations via the $PMTK353 command
The SL869-V2S and SL869L-V2S support GPS only.
Quasi-Zenith Satellite System (QZSS)
The satellites of the Japanese regional SBAS are in a highly inclined, elliptical
geosynchronous orbit, allowing continuous high-elevation coverage over Japan using
only three satellites plus one geostationary satellite. PRNs 193, 194, and 195 are
supported. They provide ranging signals for augmentation of the GPS system.
QZSS constellation usage is controlled by the $PMTK352 command and is disabled by
default.
NMEA reporting for QZSS may be enabled/disabled by the $PMTK351 command.
Satellite-Based Augmentation System (SBAS)
SBAS is not supported on the current production SL869L-V2S and SL869-V2S modules
(with the enhanced ROM).
The receiver is capable of using SBAS satellites as a source of differential corrections.
These systems (WAAS, EGNOS, GAGAN and MSAS) use geostationary satellites to
transmit signals similar to those of GPS in the same L1 band.
Enabling the SBAS feature limits the maximum fix rate to 5 Hz. If disabled, the maximum
is 10 Hz.
The module is enabled for SBAS by default but can be disabled by command PTMK313.
Either SBAS or DGPS corrections can be used and are selected by the PMTK301
command.
SBAS is not supported on the SL869L-V2S or the SL869-V2S with enhanced ROM (from
Oct 2015).
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