Navigation processor, function - GF82.85-P-3103-07B
Navigation processor and GPS control unit.
The navigation processor (N41/1) is the central component of the navigation system. It uses the incoming signals to calculate the location of the vehicle and also calculates the vehicle's route after the destination has been entered. The GPS control unit is part of the navigation processor (N41/1). It evaluates the satellite signals received from the GPS antenna (A2/49a2) (with model 220), GPS antenna (A2/23) (with model 215) and uses these signals to calculate the position of the vehicle. At least 4 satellites are required for dead reckoning, 3 satellites are sufficient for other calculations. If these requirements for dead reckoning do not exist, only the number of satellites appears in the display.
All optical information is passed to the COMAND operating, display and control unit (A40/3) via the Media Oriented System Transport (MOST). The acoustic driving directions are also transferred directly to the audio gateway control unit (N93/1) via the MOST bus.
Below is a list of the basic functions:
- Receive operating unit commands
- Control the DVD drive
- Determine the position of the vehicle
- Evaluate wheel pulses
- Route planning, route calculation and navigation
- Optical driving directions
- Communication with other system components via the optical MOST bus
- Display maps of various scales
Yaw rate sensor
The yaw rate sensor determines the direction changes of the vehicle. The yaw rate sensor is build into the navigation processor (N41/1). Calibration is not required.
When navigation begins the message "Please insert DX navigation CD" appears on the display of the operating unit.
This message is intended to ensure that the customer procures the right navigation DVD.
The DVD contains the following data:
- Program data for execution in navigation processor
- Voice data for voice output
- Map data.
The digitized map area on the DVD contains villages, towns, cities, streets, intersections and their attributes (e.g.: one-way streets, turn prohibitions, etc.). It does not contain information about company and private land, farms, small housing estates and paths.