Patent ID: 8164417

Claim:
A vehicle remote control system comprising: an in-vehicle transmission unit which transmits an authentication-use inquiry signal and a presence-check inquiry signal; two or more mobile apparatuses, each comprising a reception unit which receives the presence-check inquiry signal and the authentication-use inquiry signal and a transmission unit which transmits to the in-vehicle apparatus a response signal to the presence-check inquiry signal and the authentication-use inquiry signal; an in-vehicle reception unit which receives the response signals transmitted from the transmission units of the two or more mobile apparatuses; and an in-vehicle operation control unit which controls an operation state of the in-vehicle apparatus when a response code in at least one of the response signals received by the in-vehicle apparatus has been compared, wherein the transmission units of the two or more mobile apparatuses convert the response signals into binary data, modulate a carrier wave with a digital signal obtained through modulation by a plurality of pseudo-random codes corresponding to the binary data, and then transmit the response signals, wherein the reception unit of the in-vehicle apparatus evaluates correlations of the received response signals by use of a plurality of correlators corresponding to the plurality of pseudo-random codes and demodulates the response signals, based on outputs of the plurality of correlators, wherein the transmission unit of the in-vehicle apparatus retransmits the presence-check inquiry signal or the authentication-use inquiry signal to the two or more mobile apparatuses when there have been outputs from the plurality of correlators within a predetermined time of the occurrence of the pseudo-random codes, wherein the response signals from the transmission units of the two or more mobile apparatuses include a communication-error detection code, wherein the reception unit of the in-vehicle apparatus has a communication-error detection unit which detects, by use of the communication-error detection code, whether or not there exists a communication error, and wherein the transmission unit of the in-vehicle apparatus retransmits the presence-check inquiry signal or the authentication-use inquiry signal to the two or more mobile apparatuses when the communication-error detection unit detects a communication error.