DISTANCE DETERMINATION AND AUTHENTICATION OF A REMOTE CONTROL KEY TO A VEHICLE
First Claim
Patent Images
1. A method for authenticating a radio key for a vehicle, the method comprising:
- determining a distance between the radio key and the vehicle; and
authenticating the radio key;
generating a character string independent of an item of information transmitted by the vehicle;
transmitting the character string generated by the radio key to the vehicle to determine the distance between the radio key and the vehicle,wherein the authentication is carried out based on the character string,wherein the determination of the distance includes a propagation time measurement carried out by transmitting a first radio signal from the vehicle to the radio key, and transmitting a second radio signal transmitted from the radio key to the vehicle,wherein either the second radio signal is transmitted by the radio key as soon as the first radio signal is received by the radio key, or the first radio signal is transmitted by the vehicle as soon as the second radio signal is received by the vehicle, andwherein the authentication begins only after the two radio signals have been received.
1 Assignment
0 Petitions
Accused Products
Abstract
A method for authenticating a radio key for a vehicle involving determining a distance between the radio key and the vehicle and authenticating the radio key. A character string generated by the radio key is transmitted to the vehicle to determine the distance. The character string is generated independently of an item of information transmitted by the vehicle, and the authentication is based on the character string.
23 Citations
16 Claims
-
1. A method for authenticating a radio key for a vehicle, the method comprising:
-
determining a distance between the radio key and the vehicle; and authenticating the radio key; generating a character string independent of an item of information transmitted by the vehicle; transmitting the character string generated by the radio key to the vehicle to determine the distance between the radio key and the vehicle, wherein the authentication is carried out based on the character string, wherein the determination of the distance includes a propagation time measurement carried out by transmitting a first radio signal from the vehicle to the radio key, and transmitting a second radio signal transmitted from the radio key to the vehicle, wherein either the second radio signal is transmitted by the radio key as soon as the first radio signal is received by the radio key, or the first radio signal is transmitted by the vehicle as soon as the second radio signal is received by the vehicle, and wherein the authentication begins only after the two radio signals have been received. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A vehicle comprising:
-
a transmitter; a receiver; and controller, wherein the transmitter emits a first radio signal, the receiver is configured to receive a second radio signal from a radio key, which second radio signal comprises a character string, wherein the controller is configured to record a period of time between the emission of the first radio signal and the reception of the second radio signal to calculate a distance between the vehicle and the radio key based on the period of time and to authenticate the radio key based on the character string, wherein the vehicle is configured to determine the distance by a propagation time measurement, wherein the vehicle is configured to carry out the propagation time measurement based on a first radio signal being transmitted to the radio key by the transmitter and based on a second radio signal transmitted from the radio key and received by the receiver, wherein either the second radio signal is transmitted by the radio key as soon as the first radio signal is received by the radio key, or the first radio signal is transmitted by the vehicle as soon as the second radio signal is received by the vehicle, and wherein the vehicle is configured to begin the authentication only after the first and second radio signals have been received. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
Specification