19 | GPS Sensor
118/136 Vehicle_Control_Unit_VCU_Manual Bosch Motorsport
19 GPS Sensor
19.1 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 Vehicle Control Unit VCU (not covered
here)
Serial output -> Read in messages via RS232 Interface of Vehicle Control Unit VCU (serial
interface 2)
19.1.1 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, Vehicle Control Unit VCU supports 1,200 to 115,200
baud. GPS Rx interface baud rate must match Vehicle Control Unit VCU interface baud
rate. Vehicle Control Unit VCU Baud rate can be set with the ‘GPS_BAUDRATE’ character-
istic Data format: Vehicle Control Unit VCU expects 8 data bits, no parity bit, 1 stop bit
(8N1)
19.2 Protocol
Vehicle Control Unit VCU 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.
19.3 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.
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