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Position finding and destination-oriented navigation, function - GF82.61-P-2010GA

MODEL 463.306 /336 /346 up to 31.5.12 with CODE (EU1) COMAND APS except CODE (ZJ1) Japan version as of Model Year 2011 /YoM 10 

MODEL 463.202 /222 /236 /237 /270 /271 /303 /340 /341 up to 31.5.12 with CODE (EU1) COMAND APS except CODE (ZJ1) Japan version as of Model Year 2009 /YoM 08 

Shown on code (EU9) Surround sound system (harman/kardon Logic 7) 

Fig 1: Position Finding And Destination-Oriented Navigation Function Diagram
G07891396Courtesy of MERCEDES-BENZ USA

Function requirements, general 

Position finding and destination-oriented navigation, general 

The position finding and destination-oriented navigation function is divided into the following subareas:

General information on GPS position finding 

The GPS is a satellite-based positioning system. It is available worldwide. The GPS satellites permanently transmit time and position data (longitude and latitude).

GPS position finding is irretrievable after vehicle transport (e.g. by train or ferry or after towing). A new GPS position (after interruption of the satellite reception) can take several minutes (up to t = 20 minutes when the equipment is commissioned).

The accuracy of the position finding and the actual calculation is essentially based on the measurement of the runtimes of the signals transmitted synchronously by the various satellites. A vital precondition is the synchronicity of the clocks in the satellites and in the receiver. To this end the receiver is equipped with an automatic time correction, which in turn is made possible with the aid of the satellite signals.

GPS position finding function requirements 

Function sequence for GPS position finding 

The GPS signals are received by the GPS receiver integrated in the COMAND operating, display and controller unit via the following route:

The GPS signals are used by the COMAND operating, display and controller unit to calculate the momentary position of the vehicle (receiver). In addition, the vehicle's direction of travel is determined with the aid of the sequence of the locations calculated with GPS.

IMPORTANT Possible interference in reception of GPS signals:

Since GPS operates in the gigahertz (GHz) range (microwaves) and the signals are weak, reception interference can occur as a result of the following events:

General information on basic position finding 

Basic position finding runs parallel to GPS position finding. The COMAND operating, display and controller unit requires the following information for basic position finding:

Basic position finding function requirements 

Function sequence for basic position finding 

For basic position finding the COMAND operating, display and controller unit requires signals from the following components:

The COMAND operating, display and controller unit receives the vehicle speed signals via the following route:

The data in the turn rate sensor (gyro sensor) integrated into the COMAND operating, display and controller unit is forwarded within the COMAND operating, display and controller unit.

The data about the direction of travel (forward or backward) is received by the COMAND operating, display and controller unit in the following way:

After this, the COMAND operating, display and controller unit uses the distance traveled, the vehicle alignment and direction of travel as well as the previous location to calculate the instantaneous vehicle position (longitude and latitude).

The steering angle signal from the steering angle sensor is forwarded to the COMAND operating, display and controller unit via the following route:

IMPORTANT Calculation of the basic position finding takes approx. 1/s.

IMPORTANT Error during position finding

Basic position finding is falsified when a vehicle rolls backwards with circuit 15 OFF (ignition switched off) or if it is transported somewhere. In both cases, the deviation is corrected automatically by the navigation processor integrated into the COMAND operating, display and controller unit.

Recalibration 

Because of the tire abrasion, a constant recalibration of the tire circumference is required. It is carried out automatically and is based on the difference between the calculated and actually traveled distance between two turning points calculated with the help of map-based position finding.

General information on route calculation 

The following stretches can be excluded from the route calculation in the "Navi" base function under the "Mode" menu item:

In vehicles without code (ZU8) USA version, additional stretches can be excluded from the route calculation:

Route calculation is accomplished using the options set to the best possible extent. If observance of the options is not possible, then the options set are ignored for the sections in question and a message is displayed and signaled audibly.

The set criteria and options can be displayed and changed at any time. After successful calculation, the route is displayed on the map and an acoustic message "Calculating route" is issued at the start.

Function sequence for destination-oriented navigation through voice output 

The integrated navigation processor continuously compares the route calculation data with the position finding data and uses the data to deduce measures for further destination-oriented navigation. The voice output for route guidance is transmitted to the MOST and amplified in the sound system amplifier (with code (EU9) Surround sound system (harman/kardon Logic 7)).

The voice output is sent to the following speakers via direct lines using an audio signal:

On vehicles without code (EU9) Surround sound system (harman/ kardon Logic 7), the audio signals are output by the COMAND operating, display and controller unit via direct lines to the following speakers:

The signals for visually displaying the route guidance (map navigation) are generated by the COMAND operating, display and controller unit and shown on the display on the COMAND operating, display and controller unit, and also in the multifunction display (A1p13) of the instrument cluster (A1) in the form of arrow pictographs.

General information on dynamic route guidance (without code (ZU8) USA version) 

The current traffic situation is taken into consideration in the dynamic route guidance. The incoming information on the traffic situation can be received by the radio data system (RDS)/Traffic Message Channel (TMC) function via FM radio. The information on the current traffic situation is sent out by a specially equipped broadcasting corporation on an area-related basis via FM. A suitable FM/RDS transmitter must be tuned in. The traffic data recorder decodes the traffic information and forwards it internally to the navigation processor upon request. The navigation processor makes the decision whether the route should be changed. If necessary, a message that the route has been changed is output over the above speakers.

Function sequence for dynamic route guidance (without code (ZU8) USA version) 

The FM receiver in the COMAND operating, display and controller unit receives the traffic reports from amplifier module 1, window antenna and amplifier module 3, window antenna (except model 463.202/303) or from the radio and cell phone antenna (A28) via the radio and cell phone antenna splitter (A28/1) and the antenna splitter HF switch (A28/7) (in model 463.202/303). From there the traffic messages are forwarded to the traffic data recorder in the COMAND operating, display and controller unit. The traffic reports are stored in the traffic data recorder of the COMAND operating, display and controller unit and made available to the integrated navigation processor. The voice output for dynamic route guidance is transmitted to the MOST and amplified in the sound system amplifier (with code (EU9) Surround sound system (harman/kardon Logic 7)). The audio signals are then sent to the above speakers via direct lines.

In vehicles without code (EU9) Surround sound system (harman/ kardon Logic 7), the voice output for dynamic route guidance is performed by the COMAND operating, display and controller unit over the above vehicle speakers via direct lines using an audio signal.

Destination-oriented navigation through driving lane recommendations 

For certain turnoff situations on multiple-lane exit points (e.g. freeway intersections), driving lane recommendations are shown in the bottom line.

Along with a turnoff recommendation, the distance to the actual turnoff point is also displayed by means of a bar graph. The lanes have arrows assigned to them, which indicate on which lane the destination can be reached or the best way to reach it.

The following colors are used to represent the lanes on the display of the COMAND operating, display and controller unit:

IMPORTANT Only the dark blue arrows are displayed in the instrument cluster's multifunction display.

Map function 

The map display is always controlled by the COMAND operating, display and controller unit.

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With code (EU9) Surround sound system (harman/kardon Logic 7)		 GF82.62-P-6003G 
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