초록 ▼

There is provided a system in which a transponder is carried by each vehicle traveling on or above the earth\s surface which transmits a signal which is responsive to an interrogation signal to a ground station through two or more satellites and in the ground station, the position of the vehicle is

There is provided a system in which a transponder is carried by each vehicle traveling on or above the earth\s surface which transmits a signal which is responsive to an interrogation signal to a ground station through two or more satellites and in the ground station, the position of the vehicle is determined from the propagation time differences of the response signals received via the satellites. In this system, the information indicative of the time lag which is required for the transponder to receive the interrogation signal and to transmit the response signal responsive to the interrogation signal is included in the response signal and then such response signal is transmitted. Thus, the time lag which is peculiar to each transponder and corresponds to the time required from the reception of the interrogation signal to the transmission of the response signal can be corrected. With this system, the positioning accuracy of each vehicle can be improved.

대표청구항 ▼

A method for communicating with and determining the position which uses a satellite-based vehicle position determining and communicating service system comprising: transmitting with a transponder which is carried by each one of a plurality of vehicles which are traveling on or above the earth\s surf

A method for communicating with and determining the position which uses a satellite-based vehicle position determining and communicating service system comprising: transmitting with a transponder which is carried by each one of a plurality of vehicles which are traveling on or above the earth\s surface a predetermined response signal in response to reception of an interrogation signal; receiving and retransmitting with at least two or more satellites which have repeaters in each satellite the response signal transmitted from said transponder and retransmitting the response signal, said satellites positioned at spaced orbital locations above the earth\s surface; receiving with a ground station the response signal from said transponder which have been retransmitted from each of said satellites and said ground station determining the position of each vehicle which have a transponder on the basis of each received time of the signal from the time of transmission of said interrogation signal to the time of reception of said response signal, transmitting with said transponder of said vehicle information of the time lag of said vehicle transponder from the reception signal in said response signal, and calculating at said ground station, a position measurement difference of the vehicle by correcting each of said required times on the basis of said information of the time lag of said vehicle transponder.