Jackson Labs Mini-JLT GNSS, Руководство пользователя

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Mini-JLT GNSS™
User Manual
14 © 2017 Jackson Labs Technologies, Inc.
3.3.5 GPS:GPGGA
This command instructs the Mini-JLT GNSS™ to send the NMEA standard string $GPGGA every N
seconds, with N in the interval [0,255]. The command is disabled until the GNSS receiver achieves a
first fix.
This command has the following format:
GPS:GPGGA <int> [0,255]
GPGGA shows height in MSL Meters, this is different from traditional GPS receivers that display
height in GPS Meters. The difference between MSL and GPS height can be significant, 35m or more
are common.
3.3.6 GPS:GGASTat
This command instructs the Mini-JLT GNSS™ to send a modified version of the NMEA standard
string $GPGGA every N seconds, with N in the interval [0,255]. The command is disabled until the
GNSS receiver achieves a first fix.
This command has the following format:
GPS:GGASTat <int> [0,255]
This command replaces the regular NMEA GGA validity flag with a decimal number indicating the
lock-state of the unit. Please see section SERVo:TRACe for a detailed description of the lock state
variable. The command allows capture of the position and other information available in the GGA
command, as well as tracking the lock state and health of the unit’s OCXO performance.
GGASTat shows height in MSL Meters, this is different from traditional GPS receivers that display
height in GPS Meters. The difference between MSL and GPS height can be significant, 35m or more
are common.
3.3.7 GPS:GPRMC
This command instructs the Mini-JLT GNSS™ to send the NMEA standard string $GPRMC every N
seconds, with N in the interval [0,255]. The command is disabled until the GNSS receiver achieves a
first fix.
This command has the following format:
GPS:GPRMC <int> [0,255]
3.3.8 GPS:GPGSV
This command instructs the Mini-JLT GNSS™ to send the NMEA standard string $GPGSV every N
seconds,
with N in the interval [0,255]. The command is disabled until the GPS receiver achieves a first fix.
GPS:GPGSV <int> [0,255]
Please note that due to the large number of GNSS satellites that can be tracked in this unit, more than
the customary four GSV messages can be sent once per second. With multiple GNSS systems
enabled, a typical sky view may generate up to six GSV messages per second.