Measurement label
Function
gps_speed
Speed over the ground in kilometers/hour
gps_direction
Track angle in degrees
gps_declination
Magnetic variation degrees (Easterly var. subtracts from
true course)
gps_year
Years since 1900
gps_mon
Months since January ‐ [0,11]
gps_day
Day of the month ‐ [1,31]
gps_hour
Hours since midnight ‐ [0,23]
gps_min
Minutes after the hour ‐ [0,59]
gps_sec
Seconds after the minute ‐ [0,59]
gps_hsec
Hundredth part of second ‐ [0,99]
gps_smask
Bit mask over received NMEA sentences (Bit 0 = GGA,
Bit 1 = GSA, Bit 2 =GSV, Bit 3 = RMC, Bit 4 =VTG) within
last second.
gps_sig
GPS quality indicator (0 = Invalid; 1 = Fix; 2 = Differen‐
tial, 3 = Sensitive)
gps_fix
Operating mode, used for navigation (1 = Fix not avail‐
able; 2 = 2D; 3 = 3D)
These measurement labels are arrays, where the indexed element points to the
same satellite.
(E.g. gps_info_satsigstrength[3] tells the receiving signal strength of satellite 3.
Satellite 3 has the SAT‐ID given in gps_info_satid[3])
Measurement label
Function
gps_info_satid[ ]
Satellite PRN number
gps_info_satinuse[ ]
Used in position fix
gps_info_satelevation[ ] Elevation in degrees, 90 maximum
gps_info_satazimuth[ ] Azimuth, degrees from true north, 000 to 359
gps_info_satsig‐
strength[ ]
Signal, 00‐99 dB
GPS troubleshooting
Electrical
Is the transmitter signal of the GPS sensor connected to the receiver pin of serial
interface 2 of the DDU 8?
Is the GPS sensor powered up?
Does the GPS sensor deliver RS232 signal levels?
Is the sensor connected to the „sensor ground“ of the device?
15.5
GPS Sensor | 15
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DDU S2 PLUS Manual
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