tmc

Measure loops in the road send to the urban trafic center the trafic info. All the urban trafic centers send there info to a country trafic center who send it to a Sevice provider who send it to a radio braodcaster who integrate the trafic info in the RDS (TMC) signal.This RDS/TMC info is decoded in the GPS/RDS/TMC receiver in your car.

RDS is coded in a digital data stream of 1187,5 biz and modulated on 57kHz carier.These bits are grouped in datablocs of 26bits (16 data and 10 crc bits) 4 of this blocs is called a RDS-group. An RDS-group contains data like pi(transmitter indentification), af(alternative frequency) and of course tmc. Tmc data exist in pairs of eventcode(what's happening) and locationcode(where it's happening) Eventscode in Alert-C standard.This standard defines 1500 possible events e.g. code 1478 = terroristic incident etc... also eventcodes for whether, temp, wind and .....

The locationcodes are used with the chartdata for navigationsystem.

The mc-hardware holds a miniature FM-radio with integrated rds/tmc-decoder and a processor the processing can also be done by the calculating capacity of the GPS-receiver.

Locosys has a module RSC-2024 with integrated gps receiver and rds/tmc receiver; the internal arm-processor is used for both tasks.This module can be integrated in a navigationsystem.