An access system for a vehicle includes a receiver and an access module. The receiver is configured to receive a signal transmitted from a portable access device to the vehicle. The access module is configured to: generate a differentiated signal based on the received signal; up-sample the differentiated signal to generate a first up-sampled signal; obtain or generate an expected signal; up-sample the expected signal to generate a second up-sampled signal; cross-correlate the first up-sampled signal and the second up-sampled signal to generate a cross-correlation signal; based on the cross-correlation signal, determine a phase difference between the first up-sampled signal and the second up-sampled signal; determine a round trip time of the signal received by the receiver; and permit access to the vehicle based on the round trip time.

A first device includes: a first reference signal source; a first transmitting/receiving unit which transmits two or more first carrier signals and receives two or more second carrier signals using an output of the first reference signal source; and a calculating unit. A second device includes: a second reference signal source configured to be operated independently from the first reference signal source; and a second transmitting/receiving unit configured to transmit two or more second carrier signals and receive two or more first carrier signals using an output of the second reference signal source. A frequency group of two or more first carrier signals and a frequency group of two or more second carrier signals differ from each other. The calculating unit calculates a distance between the first device and the second device based on a phase detection result obtained by receiving the first and second carrier signals.

A portable device includes a reception antenna and a strength meter. The reception antenna includes antennas of three axes each receiving a first signal and a second signal. The strength meter measures a reception strength of the request signal and the request signal received by each of the three axes of the LF receiver. A relay attack determination device is provided with a comparator that executes a comparative process of strength ratios of the request signal and the request signal based upon a measurement value of the reception strength. In a case where the three axes include an ineffective axis, in which the measurement value of the reception strength of the request signal or the request signal deviates from a usable range, the comparator excludes the ineffective axis and executes the comparative process.

A portable device includes a reception antenna and a strength meter. The reception antenna includes antennas of three axes each receiving a first signal and a second signal. The strength meter measures a reception strength of the request signal and the request signal received by each of the three axes of the LF receiver. A relay attack determination device is provided with a comparator that executes a comparative process of strength ratios of the request signal and the request signal based upon a measurement value of the reception strength. In a case where the three axes include an ineffective axis, in which the measurement value of the reception strength of the request signal or the request signal deviates from a usable range, the comparator excludes the ineffective axis and executes the comparative process.

A vehicle includes: at least one memory configured to store at least one default Instruction Structure Key (ISK), a generated ISK, and a pin code of the vehicle; and at least one processor. The at least one default ISK may include a first default ISK and a second default ISK. The processor may generate a random number using the first default ISK, receive the second default ISK encrypted with the generated ISK generated based on the pin code, and determine the generated ISK as an encryption key for encryption communication of the vehicle when the generated random number and the random number corresponding to the second default ISK are the same.

A method for connecting a Bluetooth key to a vehicle, a vehicle Bluetooth system, and a Bluetooth key, comprises: when a mobile terminal enters a preset distance range of a vehicle, a Bluetooth master module of the vehicle performs authentication and connection with a Bluetooth key of the mobile terminal according to preset key information (S11); after the Bluetooth master module is successfully connected to the Bluetooth key, the Bluetooth master module generates an original random code and encrypts the original random code to obtain an encrypted random code (S12); the Bluetooth master module sends the original random code to a Bluetooth slave module, and sends the encrypted random code to the Bluetooth key (S13); and the Bluetooth slave module and the Bluetooth key perform bidirectional authentication according to the encrypted random code and the original random code, and when bidirectional authentication succeeds, the connection is established (S14).

An access system for a vehicle includes a receiver and an access module. The receiver is configured to receive a signal transmitted from a portable access device to the vehicle. The access module is configured to: generate a differentiated signal based on the received signal; up-sample the differentiated signal to generate a first up-sampled signal; obtain or generate an expected signal; up-sample the expected signal to generate a second up-sampled signal; cross-correlate the first up-sampled signal and the second up-sampled signal to generate a cross-correlation signal; based on the cross-correlation signal, determine a phase difference between the first up-sampled signal and the second up-sampled signal; determine a round trip time of the signal received by the receiver; and permit access to the vehicle based on the round trip time.

The present invention relates to a method for securely connecting a vehicle and a Bluetooth key, a vehicle Bluetooth module and a Bluetooth key. The method comprises: when a vehicle Bluetooth module successfully establishes a Bluetooth communication connection with a mobile terminal installed with a Bluetooth key, the vehicle Bluetooth module receiving an authentication request from the Bluetooth key, wherein an authentication manner of the authentication request is simple authentication or common authentication; when the authentication manner of the authentication request is simple authentication, the vehicle Bluetooth module performing security authentication on the Bluetooth key according to the simple authentication manner, and sending an authentication result to the Bluetooth key; and when the authentication result indicates that authentication fails, or the authentication manner of the authentication request is common authentication, the vehicle Bluetooth module performing security authentication on the Bluetooth key according to the common authentication manner.

A method for controlling a vehicle is applied to an in-vehicle terminal, includes: obtaining current position information of a vehicle and a preset electronic fence, determining a travel direction according to the current position information and the preset electronic fence; when determining that the vehicle travels from the inside of the preset electronic fence to the outside of the preset electronic fence, determining a current position state of the vehicle according to the current position information, where the position state represents a relative position of the vehicle and the preset electronic fence; determining whether the current position state is the same as a previous position state of the vehicle; and when the current position state is different from the previous position state, performing one or two of outputting warning information and sending a key shielding signal, to enable a key controller to shield a key control signal of the vehicle.

A method for passive access control including a mobile device serving as key and an interaction unit, the mobile device and the interaction unit having in each case at least one data communication facility for exchanging authorization information. Operations are provided for carrying out an electronic distance measurement between the mobile device and the interaction unit and for permitting an access and/or an interaction only if the distance of the mobile device from the interaction unit is within a permitted distance.