Of 4800 bps, which results in the first one received and recognised inĮach cycle being used. The default (mode 0) is to process all supported sentences at a linespeed
Get the numbers for the NMEA sentence of your choice.Īppend extra statistics to the clockstats line. Will fill your clockstat file rather fast. Write the sub-second fraction of the receive time stamp to theĬlockstat file for all recognised NMEA sentences. The 'mode' in the server configuration line:ġ27.127.20.x mode X mode byte bits and bit groups Bit Specific GPS sentences and bitrates may be selected by setting bits of (hhmmss)ĭenotes the signal strength (should be INVALID time, Position Fix Mode (0 = Invalid, >0 = Valid) Heading/track made good (degrees True) (x.x) $GPGGA,UTC,LAT,LAT_REF,LON,LON_REF,FIX_MODE,SAT_USED,HDOP,ALT,ALT_UNIT,GEO,G_UNIT,D_AGE,D_REF*CS $GPGLL,LAT,LAT_REF,LON,LON_REF,UTC,POS_STAT*CS $GPRMC,UTC,POS_STAT,LAT,LAT_REF,LON,LON_REF,SPD,HDG,DATE,MAG_VAR,MAG_REF*CS The various GPS sentences that this driver recognises look like this: Precision of the timecode and the latencies of the serial interface and However, in most cases the actual accuracy is limited by the Inexpensive GPS models areĪvailable with a claimed PPS signal accuracy of The accuracy depends on the receiver used.
The driver expects the receiver to be set up to transmit at least one Timescales, the driver disables processing of UTC sentences The two is a whole number of seconds which increases with each leap While the rest of the sentences report UTC. Note that Accord'sĬustom NMEA sentence $GPZDG reports using the GPS timescale, Serial Port: /dev/gps u symlink to server:port (for nmead)Īnd $GPZDG NMEA sentences by default. Is tried first for PPS, before /dev/gps u) Serial Port: /dev/gpspps u for just the PPS signal (this Serial Port: /dev/gps u 4800 - 115200 bps, 8-bits, no parity Generic NMEA GPS Receiver Generic NMEA GPS Receiver
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