An access system for a vehicle is provided and includes antennas and an access module. The antennas are configured to each receive a signal transmitted from a portable access device to the vehicle. One of the antennas is a circular polarized antenna. The access module is configured to: downconvert the received signal to generate an in-phase signal and a quadrature phase signal; execute a music algorithm to determine angles of arrival of the received signal as received at the antennas; determine a distance between the portable access device and the vehicle based on the angles of arrival; and permit access to the vehicle based on the distance.

A system and method are described for securing a vehicle. For example, one embodiment of a method comprises: generating a secret related to a radio frequency (RF) signal characteristic to be transmitted by a key fob; securely sharing the secret between a vehicle and a wireless key fob; periodically transmitting a ping signal from the vehicle in a locked or inactive state; receiving a response ping signal to the ping signal, the response ping signal transmitted by the key fob; identifying at least a first RF signal characteristic associated with the response ping signal; determining whether the first RF signal characteristic is valid based on the secret; unlocking and/or activating the vehicle upon determining that the first RF signal characteristic is valid; and maintaining the locked or inactive state and/or requiring additional authentication if the first RF signal characteristic is invalid.

The invention relates to a method for operating functional unit (32) of a motor vehicle (34) by means of an identification system (36), in which at least a first authorisation is requested for operating the functional unit (32), and in which an identification signal is transmitted to an identification device (38) by means of an identification element (26) of the identification system (36), and the functional unit (32) is operated after receiving, wherein the functional unit (32) is only operated in a second authorisation, and the second authorisation is generated by means of the identification device (38), wherein by means of the identification device (38), a first signal duration of the identification signal is determined for determining a first spacing (A1, A2, A3, A4) of the identification element (26) at a first point in time (t1), and a second signal duration of the identification signal is determined for determining a second spacing (A1′, A2′, A3′, A4′) of the identification element (26) at a second point in time (t2), and the second authorisation is generated depending on a comparison. Furthermore, the invention relates to an identification system (36).

Disclosed are a communication method for merging, with IoT technology, a 5G communication system for supporting a data transmission rate higher than that of a 4G system, and a system therefor. The disclosure can be applied to intelligent services (for example, smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, security and safety related services, and the like) on the basis of 5G communication technology and IoT-related technologies. According to various embodiments of the disclosure, a method for authenticating a smart key of an electronic device comprises the steps of: transmitting an authentication request in a predetermined cycle; receiving authentication responses from a smart key device; determining whether there is a relay attack on the basis of the interval of the received authentication responses; and authenticating the smart key device when it is determined that there is no relay attack. However, the disclosure is not delimited to the embodiment above, and other embodiments are possible.

A keysafe includes a housing, a door, a locking mechanism, a wireless communications interface, and an inhibitor system. The housing defines an internal compartment structured to receive a key fob for a vehicle. The door is positioned to enclose the internal compartment. The locking mechanism is positioned to selectively lock the door to prevent access to the internal compartment. The wireless communications interface is configured to facilitate wireless communication with an external device. The inhibitor system includes a coil disposed around the internal compartment, a battery disposed within the housing and coupled to the coil, and a controller. The controller is configured to energize the coil with the battery to inhibit communication between the key fob and the vehicle, receive a deactivation signal from the external device via the wireless communications interface, and de-energize the coil in response to receiving the deactivation signal to permit the communication.

A system for includes master and sniffer devices. The master device includes: first antennas with different polarized axes; a transmitter transmitting a challenge signal via the first antennas from the vehicle to a slave device, where the slave device is a portable access device; and a receiver receiving a response signal in response to the challenge signal from the slave device. The sniffer device includes: second antennas with different polarized axes; and a receiver receiving, via the second antennas, the challenge signal from the transmitter and the response signal from the slave device. The sniffer device measures when the challenge signal and the response signal arrive at the sniffer device to provide arrival times. The master or sniffer device estimates at least one of a distance from the vehicle to the slave device or a location of the slave device relative to the vehicle based on the arrival times.

Systems and methods of measuring distance between two wireless devices by combining phase shift and time-of-flight measurements. A first wireless devices sends a first packet to the second wireless device. After receiving the first packet, the second wireless device sending to the first wireless device a second packet. After sending the second packet, the second wireless device sends a first continuous wave signal to the first wireless device. After receiving the first continuous wave signal, the first wireless device sends to the second wireless device a second continuous wave signal. The first wireless device then calculates a time-of-flight measurement based on a time between the first wireless device sending the first packet and receiving the second packet, and calculates a second measurement based on a phase shift of the first continuous wave signal and the second continuous wave signal, and combines the two measurements.

A position estimation method for estimating a position of a mobile terminal includes: an acquisition step of acquiring distance values and radio wave intensity values between a plurality of communication devices provided in a vehicle and the mobile terminal by communicating the communication devices with the mobile terminal; a communication availability determination step of determining that a corresponding communication device is communicable when the distance value is equal to or less than a first predetermined value and the intensity value is equal to or more than a second predetermined value; and an estimation step of narrowing down a search range of the mobile terminal based on a distance value from the communication device having the smallest distance value of at least three of communication devices determined to be communicable in the communication availability determination step, and estimating the position of the mobile terminal.

A distance measuring device according to an embodiment includes a first device including a first transceiver configured to transmit a first known signal and a second known signal and receive a third known signal corresponding to the first known signal and a fourth known signal corresponding to the second known signal, a second device including a second transceiver configured to transmit the third known signal and the fourth known signal and receive the first and second known signals and a calculating section configured to calculate a distance between the first device and the second device on a basis of phases of the first to fourth known signals, and the first transceiver and the second transceiver transmit/receive the first and third known signals one time each and transmit/receive the second and fourth known signals one time each, performing transmission/reception a total of four times.

An access system for a vehicle may include at least one antenna configured to receive access signals for authorization to gain access to the vehicle, and a controller configured to receive motion data from a key fob associated with the vehicle, the motion data indicative of a route of a user associated with the key fob, classify the motion data as one of an open route and a closed route, and restrict access to the vehicle in response to the motion data being classified as an open route.