Vaisala Hydromet Data Collection Platform - Manual (Page 93)

Chapter 3 _____________________________________________ Configuring Modules and Sensors
VAISALA_______________________________________________________________________ 91
Synchronizing QML Logger Clock
It is possible to synchronize the QML logger clock according to the time
given in the NMEA GGA message. When adding the NMEA_GGA
receiver into the configuration, a static parameter GPStimeSyncDiff is
automatically generated. The default value is 0, which means that the
clock will not be synchronized. The value of GPStimeSyncDiff is the
tolerance of time difference between the logger time and the time from
the NMEA GGA message in seconds. For example, if
GPStimeSyncDiff is set as 10, and the time difference between the
logger clock and the time in the message is 10 seconds or more, the
logger clock is synchronized.
GPS_fix_st Fix quality:
0 = invalid
1 = GPS fix (SPS)
2 = DGPS fix
3 = PPS fix
4 = Real Time Kinematic
5 = Float RTK
6 = estimated (dead reckoning) (2.3
feature)
7 = Manual input mode
8 = Simulation mode
HDOP Horizontal dilution of position
Lat_NorS Latitude (North or South)
Latitude Latitude in degrees
Lon_EorW Longitude (East or West)
Longitude Longitude in degrees
no_of_sat Number of satellites being tracked
status Status of sensor interface
UTCHours Hours of UTC time
UTCMinutes Minutes of UTC time
UTCSeconds Seconds of UTC time
NOTE The time is not synchronized more often than once in a minute.
NOTE If the number of satellites tracked is zero, the time will not be
synchronized.
Table 7 GGA Variables (Continued)
Variable Description