An anti-theft device of an operational vehicle, in which an operation of cancelling an anti-theft mode is simply and easily performed, is provided. The anti-theft device includes: a travel regulation unit (70) which maintains, when the anti-theft mode is set, the operational vehicle (1) in a state where the operational vehicle (1) cannot travel; and a wireless operation terminal (80) which wirelessly operates an operational device (20). When the wireless operation terminal (80) communicates with a controller (70), the wireless operation terminal (80) performs identification authentication, and when the identification authentication between the wireless operation terminal (80) and the controller (70) is successfully performed, the travel regulation unit (70) cancels the anti-theft mode. Since the wireless operation terminal (80) is only made to communicate with the controller (70), and thus the anti-theft mode is cancelled, the operation of cancelling the anti-theft mode is simply and easily performed.

Disclosed is a distance measuring system for measuring distance of a first transceiver from second transceivers, comprising the first transceiver having a first time zone, a second transceiver having a second time zone, and a control unit having a control-unit time zone. The second transceiver ascertains a time-zone relationship between the second transceiver and the first transceiver, and transmits the time-zone relationship to the control unit. The control unit receives the time-zone relationship, and ascertains, using the received time-zone relationship, a time-zone relationship between the control-unit time zone and the first transceiver. The first transceiver transmits at a defined instant in time or for a defined time period of the first time zone a distance measurement command to the second transceiver. The first transceiver transmits a measurement signal at a further defined instant in time, and the second transceiver switches from an inactive into an active receiving or measuring state.

The invention relates to automobile transport, specifically, to car protection (security) systems, and provides a method and a system for a safe remote engine start in guarded cars protected against unauthorized use, in case of a car being equipped with an in-built immobilizer. The car immobilizer bypass system comprises two devices, one of them being a key bypass module (4) containing transceiver modules (4.2) and (4.4) controlled by controller (4.1), and the other, a frequency converter (4.3). The transceiver module (4.2) interchanges data with transceiver module (2.1) of the car's security system (2) on preset communication frequency F corresponding to the frequency of data interchange with the transponder. The frequency converter (4.3) is designed with an option of two-way conversion of interchange signals from transceiver module (4.2) to module (4.4) from frequency F to frequency f, and in reverse. The system includes a remote start control device (5) comprising transceiver modules (5.2) and (5.4) controlled by controller (5.1), and a frequency converter (5.3). Module (5.2) ensures data interchange with module (4.4) on frequency f, and the frequency converter (5.3) is designed with an option of two-way conversion of interchange signals from transceiver module (5.2) to module (5.4) from frequency f to frequency F, and in reverse. Module (5.4) provides for the option of data interchange with transponder (1.1) on frequency F. The system allows to perform a remote engine start while enhancing the system of protection against unauthorized use and preserving all the original functions of the car's security system.

A locking/unlocking system includes: a power reception device having a vehicle coil provided in a vehicle and receiving power at a first frequency in a non-contact manner from a ground coil provided on the ground; an operation switch outputting an operation signal in response to a user operation; a locking/unlocking controller that, in response to an input of an operation signal, conducts wireless communication with a key device located within a predetermined distance at a second frequency close to the first frequency and that, in response to successful wireless communication with the key device, locks/unlocks a lock provided in the vehicle; a signal determining part that outputs an input operation signal to the locking/unlocking controller; and a wiring switch that connects wiring so that the operation signal output from the operation switch is input into the signal determining part during a power reception operation of the power reception device.

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.

Passive entry systems, such as passive entry-passive start vehicle systems, using short-range wireless communication signals to determine a distance between nomadic devices and unlockable devices based on a round trip time of flight (TOF) measurement.

An apparatus and method for detecting a vehicle key position are provided. The apparatus includes a vehicle key including an ultra-wideband (UWB) communication-based digital key, anchors to perform UWB communication with the vehicle key, and a processor to detect a position of the digital key on the basis of the plurality of anchors.

The invention relates to an apparatus (10) for a security system of a vehicle (1), in particular for a keyless activation of a locking mechanism of the vehicle (1), having a communication device (20) for communication with a mobile identification transmitter (100) by means of a radio signal (F) with a radio frequency (F.1), wherein an inductive charging process (L) can be carried out in the region of the vehicle (1) with a charging frequency (L.1), in particular for electrically charging an energy storage device. According to the invention the radio frequency (F.1) differs from the charging frequency (L.1) such that an interference in the communication with the mobile identification transmitter (100) can be prevented.

A keyfob is disclosed for use in detecting an attack on a vehicle. The keyfob includes a microcontroller, a wake receiver and an accelerometer. The wake receiver is configured to measure received signal strength and save the measured value in received signal strength indicator (RSSI). The accelerometer is used to generate acceleration data. The microcontroller detects an attack based on the RSSI and the acceleration data.

A method of transmitting signals from a first node having multiple transceivers to a second node is disclosed. The method comprises receiving a message from the second node at the first node, wherein the message is received by each of a plurality of transceivers of the first node; and transmitting by each of the plurality of transceivers a respective data frame to the second node in response to the message; wherein each transceiver initiates the transmission of its respective data frame a predetermined time period after receipt of the message by the transceiver; and wherein the transmissions of the data frames from the plurality of transceivers overlap. The data frames may form part of a two-way ranging exchange.