Vehicle tracking system that uses satellites of global positioning system (GPS).

摘要

PRESENTS A MONITORING SYSTEM EMPLOYING SATELLITES WITH GLOBAL POSITIONING SYSTEM (GPS) providing location information, speed and time EXTREMELY ACCURATE VEHICLE OR ANY OTHER OBJECTS animate or inanimate IN ANY COMMUNICATION SYSTEM MOBILE RADIO OR INFORMATION SYSTEM, INCLUDING THOSE OPERATING IN URBAN AREAS WITH LARGE LIFTS. The monitoring system includes a sensor mounted to each object, a communication link, a workstation and a receiver GPS reference. SENSOR RUNS AFTER HIS autonomously initialisation with easy handling by an external NETWORK TO FOLLOW THROUGH THE VISIBLE SATELLITE GPS, taking measurements of time difference and frequency difference. NO navigation functions are performed by the sensor, whereby are achieved significant reductions in the cost of it. ROUGH MEASURES TAKEN BY THE SATELLITE WITH RELEVANT TIME INFORMATION AND STATE ARE SENT TO COMMUNICATION LINK retransmitted PERIODICALLY TO BE BACK TO WORK STATION. DIFFERENTIAL CORRECTIONS ALSO BE CARRIED OUT IN THE WORKSTATION TO INCREASE THE ACCURACY OF THE DETERMINATION OF THE SITUATION OF OBJECT. IN NORMAL OPERATION, REQUIRED MEASUREMENTS OF THREE SATELLITES FOR CALCULATING THE SITUATION OF AN OBJECT, BUT FOR A SHORT PERIOD OF TIME ARE ACCEPTABLE MEASURES AT LEAST TWO SATELLITES WITH AN INFORMATION SUPPORT OF TIME, ALTITUDE AND MAPPING IS SUPPLIED BY workstation.