22 | GPS Sensor
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DDU 10
Bosch Motorsport
22 GPS Sensor
22.1 GPS (Global Positioning System)
Space-based global navigation satellite system.
GPS provides positioning, navigation, and timing services to worldwide users.
GPS receiver (sensor) gives digital information about position (longitude, latitude, height),
ground speed, course, and status.
Two types of GPS receivers:
CAN output -> Read in messages via CAN Input of DDU 10 (not covered here)
Serial output -> Read in messages via RS232 Interface of DDU 10 (serial interface 2)
22.1.1 Serial interface characterization
Serial Interface is characterized by:
Voltage levels: RS232 is standard (+/-12 V), UART (0 V/ 5 V) needs level shifter
Baud rate: 9,600 is standard for GPS, DDU 10 supports 1,200 to 115,200 baud. GPS Rx in-
terface baud rate must match DDU 10 interface baud rate. DDU 10 Baud rate can be set
with the ‘GPS_BAUDRATE’ characteristic Data format: DDU 10 expects 8 data bits, no par-
ity bit, 1 stop bit (8N1)
22.2 Protocol
DDU 10 expects NMEA Protocol (ASCII).
The following messages are decoded:
Message
Function
GGA
GPS fix information
GSA
Overall satellite data
GSV
Detailed satellite data
RMC
Recommended minimum data for GPS
VTG
Vector track and speed over the ground
On most GPS sensors, these messages are activated in the default configuration.
22.3 Sensor recommendation
The system has been tested with the Navilock NL-8004P MD6 Serial PPS Multi GNSS Re-
ceiver. This sensor is based on a U-Blox 8 chipset and is fully configurable with the
Navilock “U-Center” software. To use this sensor with Bosch Motorsport components the
transfer rate, the satellite system and the update rate need to be reconfigured. More in-
formation about the configuration can be found in the Appendix.
