16 | GPS Sensor
136/148 DDU 9 Bosch Motorsport
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 = Differential, 3 =
Sensitive)
gps_fix Operating mode, used for navigation (1 = Fix not available; 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_satsigstrength[ ] Signal, 00-99 dB
16.5 GPS troubleshooting
Electrical
Is the transmitter signal of the GPS sensor connected to the receiver pin of serial interface
2 of the DDU 9?
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?
Interface
Do the baud rates of the GPS sensor and the DDU 9 match?
Is the GPS sensor set up for 8N1 transmission parameters?
Is the GPS sensor set up for NMEA messages?
Are the GGA, VTG, RMC messages activated?
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