Position finding, function - GF82.95-P-3000GZU

MODEL 164 with CODE (359) TELE AID emergency call system with CODE (494) USA version 

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

Position finding 

The position of the vehicle is determined with the aid of

• GPS position finding
• vehicle-specific data.

GPS position finding 

Relocation with GPS (after interruption of satellite reception) may require several minutes (up to 20 min. when emergency call system control unit is operated for the first time). The processor and receiver unit for the GPS are integrated into the emergency call system control unit (N123/4). When signals are received by the GPS antenna (A2/93a6), from at least 3 satellites, the position of the receiver (vehicle) can be calculated. In addition, the vehicle's direction of travel is determined with the aid of the sequence of the locations calculated with GPS.

Vehicle-specific data 

Vehicle-specific data are also used, in addition to GPS position finding; these are:

• The signals processed by the ESP control unit (N47-5) from the left front RPM sensor (L6/1), right front RPM sensor (L6/2), left rear RPM sensor (L6/3) and right rear RPM sensor (L6/4) are sent to the central gateway control unit (N93) over the Control Area Network bus, class C (engine compartment) (CAN C). The central gateway control unit receives the message and transfers it to the emergency call system control unit over the Control Area Network bus, class D (diagnosis) (CAN D).
• The data from the gyrosensor integrated into the emergency call system control unit (the emergency call system control unit calculates the vehicle direction (compass direction)).
• The data on the direction of travel (forward or reverse).

With the aid of the GPS data and vehicle-specific data, the momentary vehicle position (longitude and latitude), direction and speed are calculated. If an accident occurs, the emergency call system control unit automatically generates an emergency call telegram containing the position data for the vehicle and transmits it using the mobile two-way radio system in the emergency call system. The emergency call signal reaches the service provider. With the equipment there, the exact position of the vehicle is determined using the position data.