Patent ID: 7603232
Filing Date: 2009-10-13
Classification: G01C

Abstract:
1. A vehicle position information transmitter via a satellite comprising: a satellite network signal transceiver for transmitting and receiving a satellite signal to/from a vehicle position information relay satellite through a satellite network antenna; a terrestrial network signal transceiver for transmitting and receiving a mobile communication signal to/from a base station through a terrestrial network antenna; a receiving signal comparator for comparing an intensity of the received satellite signal with an intensity of the received mobile communication signal; a communication network determiner for determining a signal transmission network based on the result of comparison the signal intensities from the receiving signal comparator; a communication link setup unit for establishing a satellite network link through the satellite network signal transceiver or a terrestrial network link through the terrestrial network signal transceiver according to the determined communication network from the communication network determiner; and a transmission signal generator for generating a signal to transmit through the setup communication link at the communication link setup unit, wherein vehicle position information and vehicle ID are transmitted through the satellite network if a satellite network communication state is good as the result of comparing the signal intensities, or vehicle position information and vehicle ID are transmitted through the terrestrial network if a terrestrial network communication state is good as the result of comparing the signal intensities, in response to a vehicle position information upload instruction, to provide a vehicle position tracking service to a corresponding subscriber based on the vehicle position information and vehicle ID communicated from the vehicle position information transmitter through the satellite network and/or the terrestrial network.