Method for measuring distance between two objects and method for controlling access to an object or the use thereof, in particular access control and driving authorization for a motor vehicle

A bidirectional dialogue is carried out between a portable code emitter ( 15 ) and a base station ( 1 ) for access to a motor vehicle. Both signals are correlated with each other and the dialogue repeated at an altered carrier frequency. The distance of the code emitter ( 15 ) from the base station...

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Bibliographische Detailangaben
1. Verfasser:	BERGERHOFF NIKOLAS
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES THEREFOR ANALOGOUS ARRANGEMENTS USING OTHER WAVES ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDEDFOR ELSEWHERE CHECKING-DEVICES CONTROL OR REGULATING SYSTEMS IN GENERAL CONTROLLING DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES FIXED CONSTRUCTIONS FUNCTIONAL ELEMENTS OF SUCH SYSTEMS GENERATING RANDOM NUMBERS HANDCUFFS KEYS LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES LOCKS MEASURING MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS ORELEMENTS PERFORMING OPERATIONS PHYSICS RADIO DIRECTION-FINDING RADIO NAVIGATION REGISTERING OR INDICATING THE WORKING OF MACHINES REGULATING SAFES TESTING TIME OR ATTENDANCE REGISTERS TRANSPORTING VEHICLES IN GENERAL VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISEPROVIDED FOR VOTING OR LOTTERY APPARATUS WINDOW OR DOOR FITTINGS
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Beschreibung
Zusammenfassung:	A bidirectional dialogue is carried out between a portable code emitter ( 15 ) and a base station ( 1 ) for access to a motor vehicle. Both signals are correlated with each other and the dialogue repeated at an altered carrier frequency. The distance of the code emitter ( 15 ) from the base station ( 11 ) is determined from the difference in two phase difference measurements between the sent and received signal in one station ( 11 or 15 ). Access to, or use of the motor vehicle ( 10 ) is only permitted when the code emitter ( 15 ) is within a certain distance from the motor vehicle ( 10 ).