Basic location finding, function - GF82.61-P-3006GI

MODEL 163 as of 1.9.01 with CODE (522) Modular control system (MCS) radio USA with CODE (357) Navigation system - additional unit with CODE (818b) Single CD player - additional unit with CODE (491) U.S. version 

Basic location finding (dead reckoning) 

Is the basic function of permanent location finding It is accomplished permanently by the navigation processor  when the ignition is switched on and is not dependent on the CD-ROM  map.

The current position is stored after the ignition is switched off.

The following information is calculated with the aid of basic location finding  :

• Distance traveled
• Direction of motion (forward or backward) and
• Direction in which vehicle is pointing

Basic location finding is accomplished approx. once per second  .

Distance traveled 

The navigation processor  receives the signals output by the front right wheel speed sensor (L6/2) from the traction system control module (N47)  via discrete leads.

Evaluation of the wheel speed signals allows calculation of the distance traveled.

Direction of motion 

The navigation processor  recognizes the direction of motion (forward or reverse) from the reverse signal.

Direction in which vehicle is pointing 

From the data of the gyrosensor  and the sequence of the locations calculated with GPS  the navigation processor the  calculates the direction in which the vehicle is pointing (compass direction).

The difference between calculated and actual distance traveled between two turning points is used for automatic recalibration of the tire circumference (required due to tire wear).

Location finding errors during basic location finding 

Rolling backwards without the reverse gear engaged is evaluated as forward motion, and may lead to an error in the location finding.

Rolling with the ignition switched off or vehicle transportation also falsify map matching.

In both cases the deviation is automatically corrected by the navigation processor  after receiving GPS data  .

Calibration 

Wheel calibration is not required following tire change.

	Global positioning system location finding, function		GF82.61-P-3007GI
	Map-supported location finding, function		GF82.61-P-3008GI
	Guidance, function		GF82.61-P-3012GI
	Radio and navigation module, location/purpose/ design/function		GF82.61-P-4109GI