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WO2003102878A1 - Method for controlling user authorization - Google Patents

Method for controlling user authorization Download PDF

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Publication number
WO2003102878A1
WO2003102878A1 PCT/EP2003/005613 EP0305613W WO03102878A1 WO 2003102878 A1 WO2003102878 A1 WO 2003102878A1 EP 0305613 W EP0305613 W EP 0305613W WO 03102878 A1 WO03102878 A1 WO 03102878A1
Authority
WO
WIPO (PCT)
Prior art keywords
encoded
data protocol
sent
ask
motor vehicle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2003/005613
Other languages
German (de)
French (fr)
Inventor
Michael Fromm
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Leopold Kostal GmbH and Co KG
Original Assignee
Leopold Kostal GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Leopold Kostal GmbH and Co KG filed Critical Leopold Kostal GmbH and Co KG
Priority to AU2003250333A priority Critical patent/AU2003250333A1/en
Publication of WO2003102878A1 publication Critical patent/WO2003102878A1/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/2072—Means to switch the anti-theft system on or off with means for preventing jamming or interference of a remote switch control signal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/20—Means to switch the anti-theft system on or off
    • B60R25/24—Means to switch the anti-theft system on or off using electronic identifiers containing a code not memorised by the user
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means
    • G07C2009/00793—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means by Hertzian waves
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C2209/00—Indexing scheme relating to groups G07C9/00 - G07C9/38
    • G07C2209/60—Indexing scheme relating to groups G07C9/00174 - G07C9/00944
    • G07C2209/61—Signal comprising different frequencies, e.g. frequency hopping

Definitions

  • the invention relates to a usage authorization control method for motor vehicles between a transceiver device on the motor vehicle side and a mobile identification transmitter, in which a digitally coded data protocol is transmitted on a radio-frequency radio link between the transceiver device on the motor vehicle side and the identification transmitter.
  • Usage authorization control methods are used in motor vehicles, in which mostly bidirectional data communication for querying an authorization control is carried out between a transceiver device arranged on the motor vehicle side and an identification transmitter carried by a user. Communication between the motor vehicle transceiver and the mobile identification transmitter takes place on a radio link in the HF range.
  • Such usage authorization control methods are used to check an access control when a locked motor vehicle is to be opened as part of a passive access and driving authorization system. Basically, these systems work satisfactorily.
  • common-channel interferers can be problematic, which can be traced back to a wide variety of sources working on the same radio channel. If a radio link is used within a free frequency, for example within the ISM bands, the potential of the co-channel interference can be relatively large.
  • Interference on the radio link means that the data protocol sent is dismembered, changed or incompletely received by the respective other subscriber - motor vehicle-side transceiver or identification transmitter - so that the desired action, for example opening or unlocking a door of a motor vehicle is not running.
  • the query dialog is triggered by manual actuation of a button on the identification transmitter, it can be easily repeated as often as often as soon as it is ascertained that a first triggering process has not led to the desired success.
  • passive access authorization systems in which the query dialog between the motor vehicle transceiver and the identification code Not possible depending on the presence of certain parameters, for example the entry of the identification transmitter in a near reception area to the motor vehicle.
  • the invention is therefore based on the object of developing an aforementioned generic access authorization control method in such a way that it is less sensitive to co-channel interference.
  • This object is achieved in that the data protocol is additionally sent on the same radio link with at least one coding that differs from the first coding.
  • This usage authorization control method takes advantage of the fact that the likelihood of two co-channel interferers with the same coding, here: with the same type of modulation as used by the user authorization control method, is much lower than the probability of the existence of a co-channel interferer in a single type of modulation used to reduce interference.
  • the probability is very high that the data protocol sent in the other type of modulation can be read completely by the receiver.
  • provision can be made to send the data protocols of the different types of modulation in succession.
  • the method can be designed to send the data protocol sent in the second or further type of modulation only when no response signal has been received within a certain period of time after sending the data protocol in a first type of modulation.
  • a data protocol can be FSK-coded (frequency shift keying), which modulation is superimposed by ASK coding (amplitude shift keying).
  • data protocols can be placed next to one another, one after the other or also overlaid by a combination of PSK modulation (phase shift keying) with AKS modulation, FSK modulation with PSK modulation, ASK modulation with FMCW modulation ( Frequency-M. modulated continuous wave) or an FSK, ASK or PSK modulation can be combined with FFSK modulation (Fast Frequency Shift Keying).
  • data protocol coding can also be carried out by changing the transmission rate. For example, a lower transmission rate, for example 7 kbaud, can represent a logical "0" and a higher transmission rate of, for example, 8.6 kbaud a logical "1".
  • FIG. 1 shows schematically the necessary elements of a transceiver unit 1 on the motor vehicle side and a mobile identification transmitter 2 for carrying out a usage authorization control method, for example as part of an access authorization control of a motor vehicle.
  • the motor vehicle transceiver 1 comprises a microcontroller 3 for providing the data to be transmitted and for controlling the transceiver process. Only the transmitter unit 'of the transceiver on the motor vehicle side is shown in the figure.
  • the data coming from the microcontroller act on an FSK modulator 4, the output of which acts on the input of an amplifier 5.
  • the amplifier 5 On the output side, the amplifier 5 is connected to an ASK modulator 6, which in turn is connected to the output side an antenna 7 is connected.
  • the ASK modulator 6 is ultimately a switch which is controlled by a control element 8.
  • the ASK modulation is provided by switching the ASK modulator 6 on and off. It is provided that the frequency of the ASK modulation is twice as high as the frequency of the FSK modulation, so that no FSK information is lost in the off phases of the ASK modulator 6.
  • a receiving device is arranged on the mobile identification transmitter 2 side.
  • the identification transmitter 2 also comprises a transmitting device which is constructed like the transmitting device of the motor vehicle-side transmitting / receiving device 1 just described.
  • the signal transmitted via a high-frequency link HF is received by an antenna 9.
  • the further circuit is designed in the manner of a divider and comprises an FSK demodulation branch 10 and an ASK demodulation branch 11. Part of the FSK demodulation branch is an FSK demodulator 12, the output signal of which ultimately acts on an input of a microcontroller 13.
  • An ASK demodulator 14 is arranged in the ASK demodulation branch 11, the output of which acts on a further input of the microcontroller 13 via a delay line 15.
  • the ASK demodulator 14 can be implemented via the RSSI output of the receiver, via which it can basically be determined whether a received signal is present or not.
  • the ASK demodulator 14 can also be implemented by a rectifier circuit, via which filtering is simultaneously possible with regard to the useful signal to be received.
  • the motor vehicle-side transceiver 1 also includes a receiver, as described as part of the identification transmitter 2, so that a bidirectional dialog can be carried out.
  • the microcontrollers used in both units serve both to control the transmission and the reception process.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mechanical Engineering (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

Disclosed is a method for controlling user authorization for motor vehicles between a transceiver device (1) that is located on the motor vehicle side and a mobile identifier (2). According to said method, a digitally encoded data protocol is transmitted on a high-frequency hop between the transceiver device (1) which is located on the motor vehicle side and the identifier (2). The inventive method is characterized by the fact that the data protocol is transmitted on the same hop along with at least one additional code which is different from the first code.

Description

Nutzungsberechtigungskontrollverfahren Use authorization verification method

Die Erfindung betrifft ein Nutzungsberechtigungskontrollverfahren für Kraftfahrzeuge zwischen einer kraftfahrzeugseitigen Sende- Empfangseinrichtung und einem mobilen Identifikationsgeber, bei dem auf einer Hochfrequenz-Funkstrecke zwischen der kraftfahrzeugseitigen Sen- de-Empfangseinrichtung und dem Identifikationsgeber ein digital codiertes Datenprotokoll übertragen wird.The invention relates to a usage authorization control method for motor vehicles between a transceiver device on the motor vehicle side and a mobile identification transmitter, in which a digitally coded data protocol is transmitted on a radio-frequency radio link between the transceiver device on the motor vehicle side and the identification transmitter.

Bei Kraftfahrzeugen werden Nutzungsberechtigungskontrollverfahren ein- gesetzt, bei denen zwischen einer kraftfahrzeugseitig angeordneten Sen- de-Empfangseinrichtung und einem von einem Benutzer mitgeführten I- dentifikationsgeber eine zumeist bidirektionale Datenkommunikation zum Abfragen einer Berechtigungskontrolle durchgeführt wird. Die Kommunikation zwischen der kraftfahrzeugseitigen Sende-Empfangseinrichtung und dem mobilen Identifikationsgeber erfolgt auf einer Funkstrecke im HF- Bereich. Solche Nutzungsberechtigungskontrollverfahren werden zum Ü- berprüfen einer Zugangskontrolle bei einem gewünschten Öffnen eines verschlossenen Kraftfahrzeuges im Rahmen eines passiven Zugangs- und Fahrberechtigungssystems eingesetzt. Grundsätzlich arbeiten diese Sys- teme zufriedenstellend. Problematisch können jedoch mitunter Gleichka- nalstörer sein, die auf unterschiedlichste, auf dem selben Funkkanal arbeitende Verursacher zurückführbar sind. Bei einer Benutzung einer Funkstrecke innerhalb einer freien Frequenz, etwa innerhalb der ISM- Bänder kann das Potential der Gleichkanalstörer relativ groß sein. Störun- gen auf der Funkstrecke führen dazu, daß das gesendete Datenprotokoll von dem jeweilig anderen Teilnehmer - kraftfahrzeugseitige Sende- Empfangseinrichturig oder Identifikationsgeber - zerstückelt, geändert oder unvollständig empfangen wird, so daß die gewünschte Aktion, beispielsweise das Öffnen bzw. Entriegeln einer Türe eines Kraftfahrzeuges nicht ausgeführt wird. Bei Funkfernbedienungen, bei denen der Abfragedialog durch manuelle Betätigung eines Tasters des Identifikationsgebers ausgelöst wird, kann ohne weiteres bei Feststellen, daß ein erster Auslösevorgang nicht zu dem gewünschten Erfolg geführt hat, dieser quasi beliebig häufig wiederholt werden. Dieses ist jedoch bei passiven Zugangsbe- rechtigungssystemen, bei denen der Abfragedialog zwischen der kraftfahrzeugseitigen Sende-Empfangseinrichtung und dem Identifikationsge- ber in Abhängigkeit von dem Vorliegen bestimmter Parameter, beispielsweise dem Eintritt des Identifikationsgebers in einem Nahempfangsbereich zum Kraftfahrzeug ausgelöst wird, nicht möglich. Diese Systeme gestatten keinen benutzerseitigen Eingriff, wie häufig ein Datenprotokoll gesendet werden kann, um störungsfrei empfangen zu werden. Zur Erhöhung der Manipulationssicherheit sperren diese Systeme in aller Regel nach dem Empfang von Störungen. Bei Vorliegen von solchen Gleichkanalstörern kann bei Einsatz eines solchen Systems der gewünschte Zutritt zum Kraftfahrzeug nicht auf die gewünschte Weise erfolgen; ein Zutritt ist dann allenfalls manuell möglich.Usage authorization control methods are used in motor vehicles, in which mostly bidirectional data communication for querying an authorization control is carried out between a transceiver device arranged on the motor vehicle side and an identification transmitter carried by a user. Communication between the motor vehicle transceiver and the mobile identification transmitter takes place on a radio link in the HF range. Such usage authorization control methods are used to check an access control when a locked motor vehicle is to be opened as part of a passive access and driving authorization system. Basically, these systems work satisfactorily. However, common-channel interferers can be problematic, which can be traced back to a wide variety of sources working on the same radio channel. If a radio link is used within a free frequency, for example within the ISM bands, the potential of the co-channel interference can be relatively large. Interference on the radio link means that the data protocol sent is dismembered, changed or incompletely received by the respective other subscriber - motor vehicle-side transceiver or identification transmitter - so that the desired action, for example opening or unlocking a door of a motor vehicle is not running. In the case of radio remote controls in which the query dialog is triggered by manual actuation of a button on the identification transmitter, it can be easily repeated as often as often as soon as it is ascertained that a first triggering process has not led to the desired success. However, this is the case with passive access authorization systems in which the query dialog between the motor vehicle transceiver and the identification code Not possible depending on the presence of certain parameters, for example the entry of the identification transmitter in a near reception area to the motor vehicle. These systems do not allow user intervention as to how often a data log can be sent to be received without interference. To increase the security against manipulation, these systems usually lock after receiving interference. If such co-channel interferers are present, the desired access to the motor vehicle cannot take place in the desired manner when using such a system; access is then only possible manually.

Ausgehend von diesem diskutierten Stand der Technik liegt der Erfindung daher die Aufgabe zugrunde, ein eingangs genanntes, gattungsgemäßes Zugangsberechtigungskontrollverfahren dergestalt weiterzubilden, daß dieses gegenüber Gleichkanalstöreinflüssen unempfindlicher ist.On the basis of this prior art discussed, the invention is therefore based on the object of developing an aforementioned generic access authorization control method in such a way that it is less sensitive to co-channel interference.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß das Datenprotokoll auf derselben Funkstrecke zusätzlich mit zumindest einer sich von der ersten Codierung unterscheidenden Codierung gesendet wird.This object is achieved in that the data protocol is additionally sent on the same radio link with at least one coding that differs from the first coding.

Bei diesem Nutzungsberechtigungskontrollverfahren wird zur Reduzierung von Störeinflüssen ausgenutzt, daß die Wahrscheinlichkeit, daß zwei Gleichkanalstörer mit derselben Codierung, hier: mit derselben Modulationsart, wie von den Nutzungsberechtigungskontrollverfahren benutzt, sehr viel geringer ist als die Wahrscheinlichkeit des Vorhandenseins eines Gleichkanalstörers in einer einzigen benutzten Modulationsart. Möglich ist selbstverständlich auch der Einsatz von drei oder mehreren Modulationsarten, über die das Datenprotokoll gesendet wird. Jedes in der unterschiedlichen Modulationsart gesendete Datenprotokoll ist für sich vollstän- dig und beinhaltet die gesamte zu übermittelnde Information. Daher ist es letztendlich für den Empfänger gleichgültig, ob das Datenprotokoll, über die eine oder andere Modulationsart codiert, empfangen worden ist, solange das Datenprotokoll in der einen oder anderen Modulationsart vollständig empfangen worden ist. Ist ein Gleichkanalstörer vorhanden und wird das Datenprotokoll, daß in der einen Benutzungsart gesendet worden ist, nicht vollständig oder gar nicht empfangen, dann ist die Wahrscheinlichkeit sehr hoch, daß das auf die andere Modulationsart gesendete Datenprotokoll vollständig empfängerseitig gelesen werden kann. Grundsätzlich kann vorgesehen sein, die Datenprotokolle der verschiedenen Modulationsarten nacheinander zu senden. In diesem Fall kann das Verfahren ausgebildet sein, das in der zweiten oder weiteren Modulationsart gesendete Datenprotokoll erst dann zu senden, wenn auf das Sen- den des Datenprotokolls in einer ersten Modulationsart innerhalb einer gewissen Zeitspanne kein Antwortsignal erhalten worden ist. Zur Erhöhung der Reaktionszeit des Systems ist es jedoch zweckmäßig, das Datenprotokoll in den unterschiedlichen Modulationsarten gleichzeitig zu senden, wobei in diesem Falle eine Überlagerung der verschiedenen Mo- dulationsarten bevorzugt wird. Auf diese Weise kann beispielsweise ein Datenprotokoll FSK-codiert (Frequenzy-Shift-Keying) moduliert sein, welche Modulation durch eine ASK-Codierung (Amplitude-Shift-Keying) ü- berlagert wird. Grundsätzlich können Daten Protokolle nebeneinander, nacheinander oder auch überlagert durch eine Kombination einer PSK- Modulation (Phase-Shift-Keying) mit einer AKS-Modulation, einer FSK- Modulation mit einer PSK-Modulation, einer ASK-Modulation mit einer FMCW-Modulation (Frequenzy-M.odulated-Continous-Wave) oder einer FSK-, ASK- oder PSK-Modulation mit einer FFSK-Modulation (Fast- Frequenzy-Shift-Keying) kombiniert sein. Zusätzlich kann eine Datenpro- tokoll-Codierung auch durch Ändern der Übertragungsrate vorgenommen werden. So kann beispielsweise eine kleinere Übertragungsrate, beispielsweise 7 kBaud eine logische „0" und eine höhere Übertraungsrate von beispielsweise 8,6 kBaud eine logische „1" darstellen.This usage authorization control method takes advantage of the fact that the likelihood of two co-channel interferers with the same coding, here: with the same type of modulation as used by the user authorization control method, is much lower than the probability of the existence of a co-channel interferer in a single type of modulation used to reduce interference. Of course, it is also possible to use three or more types of modulation via which the data protocol is sent. Each data protocol sent in the different type of modulation is complete on its own and contains all of the information to be transmitted. Therefore, it ultimately does not matter to the receiver whether the data protocol encoded by one or another type of modulation has been received as long as the data protocol has been completely received in one or the other modulation type. If there is a co-channel interferer and the data protocol that was sent in one type of use is not received completely or not at all, then the probability is very high that the data protocol sent in the other type of modulation can be read completely by the receiver. In principle, provision can be made to send the data protocols of the different types of modulation in succession. In this case, the method can be designed to send the data protocol sent in the second or further type of modulation only when no response signal has been received within a certain period of time after sending the data protocol in a first type of modulation. To increase the response time of the system, however, it is expedient to send the data protocol in the different types of modulation at the same time, in which case an overlay of the different types of modulation is preferred. In this way, for example, a data protocol can be FSK-coded (frequency shift keying), which modulation is superimposed by ASK coding (amplitude shift keying). Basically, data protocols can be placed next to one another, one after the other or also overlaid by a combination of PSK modulation (phase shift keying) with AKS modulation, FSK modulation with PSK modulation, ASK modulation with FMCW modulation ( Frequency-M. modulated continuous wave) or an FSK, ASK or PSK modulation can be combined with FFSK modulation (Fast Frequency Shift Keying). In addition, data protocol coding can also be carried out by changing the transmission rate. For example, a lower transmission rate, for example 7 kbaud, can represent a logical "0" and a higher transmission rate of, for example, 8.6 kbaud a logical "1".

Nachfolgend ist unter Bezugnahme auf die beigefügte Figur 1 eine solche Nutzungsberechtigungskontrolleinrichtung beschrieben. Figur 1 zeigt schematisiert die notwendigen Elemente einer kraftfahrzeugseitigen Sen- de-Empfangseinheit 1 und eines mobilen Identifikationsgebers 2 zum Durchführen eines Nutzungsberechtigungskontrollverfahrens, beispiels- weise im Rahmen einer Zugangsberechtigungskontrolle eines Kraftfahrzeuges. Die kraftfahrzeugseitige Sende-Empfangseinrichtung 1 umfaßt einen Mikrocontroller 3 zum Bereitstellen der zu sendenden Daten und zur Steuerung des Sende-Empfangsvorganges. Dargestellt ist in der Figur lediglich die Sendeeinheit' der kraftfahrzeugseitigen Sende- Empfangseinrichtung. Die von dem Mikrocontroller ausgehenden Daten beaufschlagen einen FSK-Modulator 4, dessen Ausgang den Eingang eines Verstärkers 5 beaufschlagt. Ausgangsseitig ist der Verstärker 5 an einen ASK-Modulator 6 angeschlossen, der ausgangsseitig wiederum mit einer Antenne 7 verbunden ist. Der ASK-Modulator 6 ist in dem dargestellten Ausführungsbeispiel letztlich ein Schalter, der durch ein Steuerglied 8 angesteuert wird. Durch Ein- bzw. Ausschalten des ASK- Modulators 6 wird die ASK-Modulation bereitgestellt. Dabei ist vorgese- hen, daß die Frequenz der ASK-Modulation doppelt so hoch ist wie die Frequenz der FSK-Modulation, damit in den Aus-Phasen des ASK- Modulators 6 keine FSK-Information verlorengeht.Such a usage authorization control device is described below with reference to the attached FIG. 1. FIG. 1 shows schematically the necessary elements of a transceiver unit 1 on the motor vehicle side and a mobile identification transmitter 2 for carrying out a usage authorization control method, for example as part of an access authorization control of a motor vehicle. The motor vehicle transceiver 1 comprises a microcontroller 3 for providing the data to be transmitted and for controlling the transceiver process. Only the transmitter unit 'of the transceiver on the motor vehicle side is shown in the figure. The data coming from the microcontroller act on an FSK modulator 4, the output of which acts on the input of an amplifier 5. On the output side, the amplifier 5 is connected to an ASK modulator 6, which in turn is connected to the output side an antenna 7 is connected. In the exemplary embodiment shown, the ASK modulator 6 is ultimately a switch which is controlled by a control element 8. The ASK modulation is provided by switching the ASK modulator 6 on and off. It is provided that the frequency of the ASK modulation is twice as high as the frequency of the FSK modulation, so that no FSK information is lost in the off phases of the ASK modulator 6.

Auf Seiten des mobilen Identifikationsgebers 2 ist eine Empfangseinrich- tung angeordnet. Neben dieser Empfangseinrichtung umfaßt der Identifikationsgeber 2 ebenfalls eine Sendeeinrichtung, die aufgebaut ist wie die eben beschriebene Sendeeinrichtung der kraftfahrzeugseitigen Sende- Empfangseinrichtung 1. Das über eine Hochfrequenzstrecke HF gesendete Signal wird von einer Antenne 9 empfangen. Der weitere Schaltkreis ist nach Art eines Teilers ausgebaut und umfaßt einen FSK- Demodulationszweig 10 und einen ASK-Demodulationszweig 11. Teil des FSK-Demodulationszweiges ist ein FSK-Demodulator 12, dessen Ausgangssignal letztendlich einen Eingang eines Mikrocontrollers 13 beaufschlagt. In dem ASK-Demodulationszweig 11 ist ein ASK-Demodulator 14 angeordnet, dessen Ausgang über eine Verzögerungsleitung 15 einen weiteren Eingang des Mikrocontrollers 13 beaufschlagt. Der ASK- Demodulator 14 kann über den RSSI-Ausgang des Empfängers realisiert sein, über den grundsätzlich feststellbar ist, ob ein Empfangssignal vorhanden ist oder nicht. Der ASK-Demodulator 14 kann auch durch eine Gleichrichterschaltung realisiert sein, über die gleichzeitig eine Filterung im Hinblick auf das zu empfangene Nutzsignal möglich ist.A receiving device is arranged on the mobile identification transmitter 2 side. In addition to this receiving device, the identification transmitter 2 also comprises a transmitting device which is constructed like the transmitting device of the motor vehicle-side transmitting / receiving device 1 just described. The signal transmitted via a high-frequency link HF is received by an antenna 9. The further circuit is designed in the manner of a divider and comprises an FSK demodulation branch 10 and an ASK demodulation branch 11. Part of the FSK demodulation branch is an FSK demodulator 12, the output signal of which ultimately acts on an input of a microcontroller 13. An ASK demodulator 14 is arranged in the ASK demodulation branch 11, the output of which acts on a further input of the microcontroller 13 via a delay line 15. The ASK demodulator 14 can be implemented via the RSSI output of the receiver, via which it can basically be determined whether a received signal is present or not. The ASK demodulator 14 can also be implemented by a rectifier circuit, via which filtering is simultaneously possible with regard to the useful signal to be received.

Die kraftfahrzeugseitige Sende-Empfangseinrichtung 1 umfaßt ebenfalls einen Empfänger, wie als Teil des Indentifikationsgebers 2 beschrieben ist, damit ein bidirektionaler Dialog durchgeführt werden kann. Die in beiden Einheiten eingesetzten Mikrocontroller dienen sowohl zum Steuern des Sende- als auch des Empfangsvorganges.The motor vehicle-side transceiver 1 also includes a receiver, as described as part of the identification transmitter 2, so that a bidirectional dialog can be carried out. The microcontrollers used in both units serve both to control the transmission and the reception process.

Aus der Beschreibung der Erfindung wird deutlich, daß mit einfachen Mit- teln wirksam die Störanfälligkeit im Hinblick auf Gleichkanalstörer nicht unerheblich reduziert worden ist. BezugszeichenlisteIt is clear from the description of the invention that the susceptibility to interference with regard to co-channel interference has been reduced considerably with simple means. LIST OF REFERENCE NUMBERS

Sende-EmpfangseinrichtungTransceiver

Identifikationsgeberidentification transmitter

Mikrocontrollermicrocontroller

FSK-ModulatorFSK modulator

Verstärkeramplifier

ASK-ModulatorASK modulator

Antenneantenna

Steuergliedcontrol member

Antenneantenna

FSK-DemodulationszweigFSK demodulation

ASK-DemodulationszweigASK demodulation

FSK-DemodulatorFSK demodulator

Mikrocontrollermicrocontroller

ASK-DemodulatorASK demodulator

Verzögerungsleitungdelay line

Hochfrequenzstrecke Radiofrequency link

Claims

Patentansprüche claims 1. Nutzungsberechtigungskontrollverfahren für Kraftfahrzeuge zwischen einer kraftfahrzeugseitigen Sende-Empfangseinrichtung (1) und ei- nem mobilen Identifikationsgeber (2), bei dem auf einer Hochfrequenz-Funkstrecke zwischen der kraftfahrzeugseitigen Sende- Empfangseinrichtung (1 ) und dem Identifikationsgeber (2) ein digital codiertes Datenprotokoll übertragen wird, dadurch gekennzeichnet, daß das Datenprotokoll auf derselben Funkstrecke zusätzlich mit zumindest einer sich von der ersten Codierung unterscheidenden1. Use authorization control method for motor vehicles between a motor vehicle-side transceiver (1) and a mobile identification transmitter (2), in which a digitally coded data protocol is used on a high-frequency radio link between the motor vehicle-side transceiver (1) and the identification generator (2) is transmitted, characterized in that the data protocol on the same radio link additionally with at least one different from the first coding Codierung gesendet wird.Coding is sent. 2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß die unterschiedliche codierten Datenkprotokolle nacheinander gesendet werden.2. The method according to claim 1, characterized in that the different coded data protocols are sent in succession. 3. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß die unterschiedlich codierten Datenprotokolle zeitgleich gesendet.3. The method according to claim 1, characterized in that the differently coded data protocols are sent simultaneously. 4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die unterschiedlich codierten Datenprotokolle überlagert gesendet werden.4. The method according to claim 3, characterized in that the differently coded data protocols are sent superimposed. 5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Datenprotokoll sowohl FSK-codiert sowie ASK- codiert gesendet wird.5. The method according to any one of claims 1 to 4, characterized in that the data protocol is both FSK-encoded and ASK-encoded is sent. 6. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Datenprotokoll sowohl PSK-codiert sowie ASK- codiert gesendet wird.6. The method according to any one of claims 1 to 4, characterized in that the data protocol is both PSK-encoded and ASK-encoded is sent. 7. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Datenprotokoll sowohl FSK-codiert sowie PSK- codiert gesendet wird.7. The method according to any one of claims 1 to 4, characterized in that the data protocol is both FSK-encoded and PSK-encoded is sent. 8. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Datenprotokoll sowohl ASK-codiert als auch FMCW-codiert gesendet wird. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Datenprotokoll zum einen FSK-codiert, ASK- codiert oder PSK-codiert und ferner FFSK-codiert gesendet wird. 8. The method according to any one of claims 1 to 4, characterized in that the data protocol is both ASK-encoded and FMCW-encoded. Method according to one of claims 1 to 4, characterized in that the data protocol is on the one hand FSK-encoded, ASK-encoded or PSK-encoded and also FFSK-encoded.
PCT/EP2003/005613 2002-05-31 2003-05-28 Method for controlling user authorization Ceased WO2003102878A1 (en)

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Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10224284.4 2002-05-31
DE2002124284 DE10224284A1 (en) 2002-05-31 2002-05-31 Use authorization verification method

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