EP1336264A1 - Antenna system - Google Patents

Antenna system

Info

Publication number
EP1336264A1
EP1336264A1 EP01900420A EP01900420A EP1336264A1 EP 1336264 A1 EP1336264 A1 EP 1336264A1 EP 01900420 A EP01900420 A EP 01900420A EP 01900420 A EP01900420 A EP 01900420A EP 1336264 A1 EP1336264 A1 EP 1336264A1
Authority
EP
European Patent Office
Prior art keywords
receiver
test
antenna system
antenna
frequency
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.)
Withdrawn
Application number
EP01900420A
Other languages
German (de)
French (fr)
Inventor
Achim Ratzel
Dirk Wendt
Peter Schaich
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.)
Hirschmann Electronics GmbH and Co KG
Hirschmann Electronics GmbH
Original Assignee
Hirschmann Electronics GmbH and Co KG
Hirschmann Electronics GmbH
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 Hirschmann Electronics GmbH and Co KG, Hirschmann Electronics GmbH filed Critical Hirschmann Electronics GmbH and Co KG
Publication of EP1336264A1 publication Critical patent/EP1336264A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/20—Monitoring; Testing of receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining

Definitions

  • the invention relates to an antenna system.
  • Such an antenna system is known from DE 196 18 333 AI.
  • the antenna system is part of a mobile radio reception system.
  • Antenna system has at least one antenna.
  • the signals received by the antenna are fed to a receiver designed as a superimposed receiver.
  • the superimposition receiver has a mixer, to which a bandpass filter is assigned on the input side and on the output side.
  • An oscillator is also assigned to the mixer.
  • the bandpass filter upstream of the mixer is used for image frequency suppression.
  • the signal present at the input and the oscillator signal are mixed by means of the mixer.
  • the intermediate frequency signal thus obtained is filtered in the bandpass filter downstream of the mixer and then fed to a signal processing unit for further processing.
  • the antenna system can be switched from a control mode in which radio signals are received and evaluated to a test mode in which a self-test is carried out.
  • a separate transmission antenna and a circuit arrangement connected to the transmission antenna are provided for carrying out the self-test.
  • the circuit arrangement has a frequency converter which generates a high-frequency output signal with which the transmitting antenna is controlled.
  • the frequency converter is connected to the oscillator of the local receiver.
  • the frequency converter is connected to an intermediate frequency oscillator, which is also part of the circuit arrangement.
  • an intermediate frequency limiter can be provided, which is connected to the output of the heterodyne receiver.
  • the frequency of the high-frequency output signal generated in the frequency converter is predetermined by the intermediate frequency oscillator and the oscillator of the local receiver and thus to the frequency of the
  • the high-frequency output signal is capacitively coupled into the antenna of the antenna system via the transmitting antenna.
  • the signals present at the output of the heterodyne receiver are recorded by means of a measuring device for carrying out the self-test.
  • the object of the invention is to provide an antenna system in which a function check can be carried out with as little effort as possible.
  • the antenna system according to the invention has a plurality of antennas which can be connected in predetermined combinations to at least two receivers via a combination unit.
  • the antenna system also has a signal processing unit for evaluating the output signals of the receivers and a control unit by means of which at least one of the antennas can be switched to transmit mode in order to carry out a self-test. With a test frequency specified via a first receiver, this antenna sends test signals which are coupled into at least one further antenna which is connected to the second receiver via the combination device and whose frequency is matched to the test frequency.
  • Self-tests record the reception levels of the second receiver as actual values and compare them with specified target values.
  • the antenna system according to the invention has at least two receivers, which are preferably operated simultaneously during normal operation of the antenna system.
  • a first receiver is preferably used for preprocessing radio signals received with an antenna, which are currently being received and output in the radio reception system. With the other receiver, radio signals that are received with further antennas are processed to provide additional functions for the radio reception system.
  • Such additional functions can be formed, for example, by reception optimization functions, in particular RDS (Radio Data System) functions. If the radio receiver system is used to receive a radio station at a certain frequency, the second receiver is used to check whether the same content is better on other frequencies, i.e. can be received with signals of higher amplitudes or with a better signal / noise ratio.
  • RDS Radio Data System
  • the two receivers are used to carry out the self- tests used.
  • the self-test and its control are expediently carried out centrally in the control unit.
  • control unit switches one of the antennas of the antenna system to transmit mode, this antenna sending test signals, the test frequency of which is predetermined by the first receiver.
  • the antenna to be tested is connected to the second receiver, the frequency of which is matched to the test frequency.
  • the reception levels of the test signal are recorded as actual values and compared with predetermined target values.
  • the main advantage of the antenna system according to the invention is that by using the two receivers to carry out the self-test, separate, additional components can be almost completely dispensed with. The self-test can therefore be carried out with little additional circuitry.
  • an antenna of the antenna system can be switched to transmit mode for carrying out the self-test, so that
  • test frequency can be tuned via the control unit, so that a comprehensive and reliable function check is guaranteed.
  • Figure 1 Block diagram of an exemplary embodiment of the invention
  • FIG. 1 shows an exemplary embodiment of the antenna system 1 according to the invention.
  • the antenna system 1 is part of a mobile radio reception system, which in the present example is installed in a motor vehicle.
  • the antenna system 1 has a plurality of antennas 2, which are preferably integrated in the rear window of the motor vehicle.
  • the antennas 2 can be designed differently and can be used to receive radio signals of different frequency ranges.
  • individual antennas 2 can also be provided for receiving additional signals, which are used, for example, for the central locking of the motor vehicle.
  • the antennas 2 are connected to two receivers 4, 4 'via a combination device 3. In principle, more than two receivers 4, 4 'can also be connected.
  • the outputs of the receiver unit are routed to a signal processing unit 5, which is formed by an analog, integrated circuit or a digital signal processor.
  • the combination device 3 is formed by a circuit logic, by means of which a predetermined combination of antennas 2 can be switched to each of the receivers 4, 4 '.
  • the combination device 3 thus makes a selection as to which antennas 2 are assigned to the individual receivers 4, 4 '.
  • the receivers 4, 4 ' are designed as superimposed receivers with an essentially identical structure.
  • Each of the receivers 4, 4 ' has a mixer 6, 6', to the first input of which an oscillator 7, T is connected.
  • a supply line leads from an output of the combination device 3 via a first bandpass filter 8, 8 'to a second input of the mixer 6, 6'.
  • the output of the mixer 6, 6 ' is led to the signal processing unit 5 via a second bandpass filter 9, 9 ".
  • the first bandpass filter 8, 8 ' is tuned to the frequency of the radio signals received with the antennas 2.
  • the filtered output signal of the combination device 3 and the signal of the oscillator 7, 7 ' are mixed in the mixer 6, 6', as a result of which a lower-frequency intermediate-frequency signal is generated from the high-frequency broadcast signal.
  • the intermediate frequency corresponds to the difference between the frequencies of the broadcast signal and the oscillator 7, 7 '.
  • the intermediate frequency signal is then filtered in the second bandpass filter 9, 9 'which is permanently set to the intermediate frequency.
  • the output signal of the respective receiver 4, 4 'obtained in this way is further processed in the signal processing unit 5.
  • the combination device 3 is controlled by a control unit 10, which is preferably formed by a microcontroller.
  • the oscillators 7, 7 'of the receivers 4, 4 are also controlled by the control unit 10.
  • a self-test is carried out to check the functionality.
  • the self-test is preferably carried out during predetermined time intervals which interrupt the normal operation of the antenna system 1.
  • a self-test takes place after a motor vehicle has been assembled, during a vehicle's downtime in a workshop and when the radio receiver system is switched on.
  • the self-test is carried out and controlled centrally via the control unit 10.
  • a switch 11 connected to the control unit 10 is provided to control the self-test.
  • the switch 11 is arranged on a feed line which connects the oscillator 7 of the first receiver 4 to the combination device 3.
  • a level measuring device 12 is provided at the output of the second receiver 4 ′′.
  • the level measuring device 12 is on the control unit 10 is connected so that the received levels detected by the level measuring device 12 can be read into the control unit 10 for further evaluation.
  • radio signals in particular These are the radio signals from the radio station that is currently set in the radio reception system.
  • At least one further antenna 2 is connected to the other receiver 4 'or 4.
  • the radio signals are expediently received and evaluated in this receiver 4 'or 4 in order to provide additional functions for the radio receiver system.
  • Such additional functions can in particular be formed by reception optimization functions such as the RDS (Radio Data System) function.
  • This function is used to optimize the reception of a specific radio station in the broadcast reception system.
  • Radio stations are reproduced via the radio reception system, the radio signals of the same content received with the second receiver 4 'or 4, which are, however, transmitted with different additional frequencies, are evaluated in the background.
  • the signal processing unit 5 then examines the frequency at which the radio signals of the same content are optimally received, i.e. for which frequency the highest signal amplitude and / or the best signal / noise ratio is obtained. Then the broadcast signals with the optimal frequency can be selected automatically for playback via the signal processing unit 5.
  • the regular operation is carried out via the control unit 10 at predetermined times interrupted, so that the antenna system 1 is then switched to a test mode for carrying out a self-test.
  • the duration of the self-test is also specified via the control unit 10.
  • the switch 11 is closed via the control unit 10.
  • the control unit 10 inputs a control command into the combination device 3.
  • the control command in the combination device 3 switches one of the antennas 2 to transmit mode.
  • the antenna 2 operated in transmission mode is connected to the oscillator 7 of the first receiver 4 by the closed switch 11.
  • the antenna 2 operated in transmission mode thus sends out test signals with a test frequency which is predetermined by the oscillator 7 of the first receiver 4.
  • the antenna 2 operated in the transmission mode is expediently not one of the antennas 2 of the antenna system 1 which are used for the current reception of the radio signals.
  • the control unit 10 also selects the antennas 2 to be checked during the self-test, which are preferably connected one after the other to the second receiver 4 'via the combination device 3.
  • test signals emitted by the antenna 2 operated in the transmission mode are coupled to the antenna 2 to be tested and connected to the second receiver 4 '.
  • the test signals received by this antenna 2 are evaluated in the second receiver 4 '.
  • the frequency of the second receiver 4 ' is on the test frequency, which in the
  • Oscillator 7 of the first receiver 4 is generated, tuned.
  • the test frequency is 100 MHz
  • the bandpass filter 8 'of the second receiver 4 is matched to this test frequency.
  • the oscillator 7 'of the second receiver 4 C is tuned to the test frequency. In the present example, its frequency is 110.7 MHz, so that the intermediate frequency signal at the output of the mixer 6 'is 10.7 MHz, the downstream bandpass being tuned to this intermediate frequency.
  • the test frequency i.e. the frequency of the oscillator 7 of the first receiver 4 can be tuned.
  • the frequency of the oscillator 7 'of the second receiver 4' is changed accordingly.
  • the arrangement thus formed for carrying out the self-test thus has a two-channel structure.
  • the first receiver 4 with the antenna 2 operated in transmission mode forms a first channel
  • the second receiver 4 ′ forms the second channel with the antenna 2 to be checked.
  • test signals are coupled from the transmitting antenna into the antenna 2 to be checked.
  • the received levels recorded with the level measuring device 12 form actual values which are compared in the control unit 10 with setpoints which are specified and stored there. Additionally or alternatively, received quality-evaluating signals obtained from the signal processing unit 5 from the output signals of the second receiver 4 'can be included as actual values in the
  • Control unit 10 is read in and compared there again with suitable target values.
  • the comparison of the actual values with the target values in the control unit 10 provides a measure of the quality of the signals which are received by the antenna 2 to be checked.
  • the actual values are preferably compared with the target values based on tolerance bands specified in the control unit 10. Adequate error-free functioning of the antenna system 1 is present when the actual values match the target values within the respective tolerance bands.
  • all antennas 2 required for receiving operation are preferably checked.
  • the test frequency is changed within a predetermined frequency range during the self-test.
  • the switch 11 is opened again and the antenna 2 operated during the self-test in the transmission mode is switched back to the reception mode.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

The invention relates to an antenna system (1) comprising several antennas (2), which can be connected to at least two receivers (4, 4') via a combination unit. According to the invention, a signal processing unit (5) for evaluating the output signals of the receivers (4, 4') and a control unit (10) are provided, by means of which at least one of the antennas can be switched to transmit mode in order to conduct a self-test. These antennas (2) transmit test signals with a test frequency that is pre-set by a first receiver (4). Said test signals are fed into at least one other antenna (2) that, via the combination device (3), is connected to the second receiver (4') whose frequency is tuned to the test frequency. In order to conduct the self-test, the receiving levels of the second receiver (4') are recorded as actual values and compared with predetermined set values. This results in the realization of an antenna system in which a function check is conducted with the least possible amount of complexity.

Description

Antennensystemantenna system
Die Erfindung betrifft ein Antennensystem.The invention relates to an antenna system.
Ein derartiges Antennensystem ist aus der DE 196 18 333 AI bekannt. Das Antennensystem ist Bestandteil einer mobilen Rundfunkempfangsanlage. DasSuch an antenna system is known from DE 196 18 333 AI. The antenna system is part of a mobile radio reception system. The
Antennensystem weist wenigstens eine Antenne auf. Die von der Antenne empfangenen Signale werden einem als Überlagerungsempfänger ausgebildeten Empfänger zugeführt. Der Überlagerungsempfänger weist einen Mischer auf, welchem eingangsseitig und ausgangsseitig jeweils ein Bandpassfϊlter zugeord- net ist. Zudem ist dem Mischer ein Oszillator zugeordnet. Das dem Mischer vorgeordnete Bandpassfilter dient zur Spiegelfrequenzunterdrückung. Mittels des Mischers wird das am Eingang anstehende Signal und das Oszillatorsignal gemischt. Das dadurch erhaltene Zwischenfrequenzsignal wird in dem dem Mischer nachgeordneten Bandpassfilter gefiltert und dann einer Signalverarbei- tungseinheit zur Weiterverarbeitung zugeführt.Antenna system has at least one antenna. The signals received by the antenna are fed to a receiver designed as a superimposed receiver. The superimposition receiver has a mixer, to which a bandpass filter is assigned on the input side and on the output side. An oscillator is also assigned to the mixer. The bandpass filter upstream of the mixer is used for image frequency suppression. The signal present at the input and the oscillator signal are mixed by means of the mixer. The intermediate frequency signal thus obtained is filtered in the bandpass filter downstream of the mixer and then fed to a signal processing unit for further processing.
Zur Funktionsüberprüfung des Antennensystems ist dieses von einem Regelbetrieb, in welchem Rundfunksignale empfangen und ausgewertet werden, auf einen Prüfmodus umschaltbar, in welchem ein Selbsttest durchgeführt wird.To check the function of the antenna system, it can be switched from a control mode in which radio signals are received and evaluated to a test mode in which a self-test is carried out.
Zur Durchführung des Selbsttests ist eine separate Sendeantenne und ein an die Sendeantenne angeschlossene Schaltungsanordnung vorgesehen.A separate transmission antenna and a circuit arrangement connected to the transmission antenna are provided for carrying out the self-test.
Die Schaltungsanordnung weist einen Frequenzumsetzer auf, welcher ein Hochfrequenz-Ausgangssignal erzeugt, mit welchem die Sendeantenne angesteuert wird. Der Frequenzumsetzer ist an den Oszillator des Überlagerungsempfängers angeschlossen. Zudem ist der Frequenzumsetzer an einen Zwischenfrequenzoszillator angeschlossen, der ebenfalls Bestandteil der Schaltungsanordnung ist. Alternativ zum Zwischenfrequenzoszillator kann ein Zwischenfrequenz- Begrenzer vorgesehen sein, der an den Ausgang des Überlagerungsempfängers angeschlossen ist.The circuit arrangement has a frequency converter which generates a high-frequency output signal with which the transmitting antenna is controlled. The frequency converter is connected to the oscillator of the local receiver. In addition, the frequency converter is connected to an intermediate frequency oscillator, which is also part of the circuit arrangement. As an alternative to the intermediate frequency oscillator, an intermediate frequency limiter can be provided, which is connected to the output of the heterodyne receiver.
Die Frequenz des im Frequenzumsetzer generierten Hochfrequenz- Ausgangssignals ist durch den Zwischenfrequenzoszillator und den Oszillator des Überlagerungsempfängers vorgegeben und damit auf die Frequenz desThe frequency of the high-frequency output signal generated in the frequency converter is predetermined by the intermediate frequency oscillator and the oscillator of the local receiver and thus to the frequency of the
Überlagerungsempfängers abgestimmt.Overlay receiver tuned.
Das Hochfrequenz-Ausgangssignal wird kapazitiv über die Sendeantenne auf die Antenne des Antennensystems eingekoppelt.The high-frequency output signal is capacitively coupled into the antenna of the antenna system via the transmitting antenna.
Die dabei am Ausgang des Überlagerungsempfängers anstehenden Signale werden mittels einer Messeinrichtung zur Durchführung des Selbsttests erfasst.The signals present at the output of the heterodyne receiver are recorded by means of a measuring device for carrying out the self-test.
Nachteilig bei einem derartigen Antennensystem ist, dass zur Durchführung eines Selbsttests eine zusätzliche Schaltungsanordnung mit einer separatenA disadvantage of such an antenna system is that an additional circuit arrangement with a separate one is used to carry out a self-test
Sendeantenne notwendig ist. Dies bedingt einen unerwünscht hohen Aufwand zur Durchführung des Selbsttests.Transmitting antenna is necessary. This requires an undesirably high amount of effort to carry out the self-test.
Der Erfindung liegt die Aufgabe zugrunde, ein Antennensystem bereitzustellen, bei welchem eine Funktionsuberprufung mit möglichst geringem Aufwand durchführbar ist.The object of the invention is to provide an antenna system in which a function check can be carried out with as little effort as possible.
Zur Lösung dieser Aufgabe sind die Merkmale des Anspruchs 1 vorgesehen. Vorteilhafte Ausführungsfoπnen und zweckmäßige Weiterbildungen der Erfindung sind in den Unteransprüchen beschrieben. Das erfindungsgemäße Antennensystem weist mehrere Antennen auf, welche in vorgegebenen Kombinationen über eine Kombinationseinheit an wenigstens zwei Empfanger anschließbar sind. Das Antennensystem weist weiterhin eine Signal Verarbeitungseinheit zur Auswertung der Ausgangssignale der Empfän- ger und eine Steuereinheit auf, mittels derer zur Durchführung eines Selbsttests wenigstens eine der Antennen auf Sendebetrieb schaltbar ist. Diese Antenne sendet mit einer über einen ersten Empfänger vorgegebene Prüffrequenz Prüfsignale, welche in wenigstens eine weitere Antenne eingekoppelt sind, welche über das Kombinationsgerät an den zweiten Empfänger angeschlossen ist, des- sen Frequenz auf die Prüffrequenz abgestimmt ist. Zur Durchführung desThe features of claim 1 are provided to achieve this object. Advantageous embodiments and expedient developments of the invention are described in the subclaims. The antenna system according to the invention has a plurality of antennas which can be connected in predetermined combinations to at least two receivers via a combination unit. The antenna system also has a signal processing unit for evaluating the output signals of the receivers and a control unit by means of which at least one of the antennas can be switched to transmit mode in order to carry out a self-test. With a test frequency specified via a first receiver, this antenna sends test signals which are coupled into at least one further antenna which is connected to the second receiver via the combination device and whose frequency is matched to the test frequency. To carry out the
Selbsttests werden die Empfangspegel des zweiten Empfängers als Istwerte erfasst und mit vorgegebenen Sollwerten verglichen.Self-tests record the reception levels of the second receiver as actual values and compare them with specified target values.
Das erfindungsgemäße Antennensystem weist wenigstens zwei Empfänger auf, die im Regelbetrieb des Antennensystems vorzugsweise simultan betrieben werden. Ein erster Empfänger dient vorzugsweise zur Vorverarbeitung von mit einer Antenne empfangenen Rundfunksignalen, welche momentan in der Rundfunkempfangsanlage empfangen und ausgegeben werden. Mit dem anderen Empfänger werden Rundfunksignale, die mit weiteren Antennen empfangen werden, zur Bereitstellung von Zusatzfunktionen für die Rundfunkempfangsanlage verarbeitet.The antenna system according to the invention has at least two receivers, which are preferably operated simultaneously during normal operation of the antenna system. A first receiver is preferably used for preprocessing radio signals received with an antenna, which are currently being received and output in the radio reception system. With the other receiver, radio signals that are received with further antennas are processed to provide additional functions for the radio reception system.
Derartige Zusatzfunktionen können beispielsweise von Empfangs- Optimierungsfunktionen, insbesondere RDS(Radio Data System)-Funktionen gebildet sein. Wird mit der Rundftinkempfangsanlage ein Radiosender bei einer bestimmten Frequenz empfangen, so wird mittels des zweiten Empfängers geprüft, ob derselbe Inhalt auf anderen Frequenzen besser, d.h. mit Signalen höherer Amplituden oder mit besserem Signal/Rauschverhältnis empfangen werden kann.Such additional functions can be formed, for example, by reception optimization functions, in particular RDS (Radio Data System) functions. If the radio receiver system is used to receive a radio station at a certain frequency, the second receiver is used to check whether the same content is better on other frequencies, i.e. can be received with signals of higher amplitudes or with a better signal / noise ratio.
Erfindungsgemäß werden die beiden Empfänger zur Durchführung des Selbst- tests genutzt. Die Durchfuhrung des Selbsttests und dessen Steuerung erfolgt zweckmäßigerweise zentral in der Steuereinheit.According to the invention, the two receivers are used to carry out the self- tests used. The self-test and its control are expediently carried out centrally in the control unit.
Hierzu schaltet die Steuereinheit eine der Antennen des Antennensystems auf Sendebetrieb, wobei diese Antenne Prüfsignale sendet, deren Prüffrequenz vom ersten Empfänger vorgegeben ist.For this purpose, the control unit switches one of the antennas of the antenna system to transmit mode, this antenna sending test signals, the test frequency of which is predetermined by the first receiver.
Die jeweils zu prüfende Antenne ist an den zweiten Empfänger angeschlossen, dessen Frequenz auf die Prüffrequenz abgestimmt ist. Zur Durchführung des Selbsttests werden die Empfangspegel des Prüfsignals als Istwerte erfasst und mit vorgegebenen Sollwerten verglichen.The antenna to be tested is connected to the second receiver, the frequency of which is matched to the test frequency. In order to carry out the self-test, the reception levels of the test signal are recorded as actual values and compared with predetermined target values.
Der wesentliche Vorteil des erfindungsgemäßen Antennensystems besteht darin, dass durch die Nutzung der beiden Empfänger zur Durchführung des Selbst- tests auf separate, zusätzliche Komponenten nahezu vollständig verzichtet werden kann. Der Selbsttest ist daher mit nur geringem zusätzlichen Schaltungsaufwand durchführbar.The main advantage of the antenna system according to the invention is that by using the two receivers to carry out the self-test, separate, additional components can be almost completely dispensed with. The self-test can therefore be carried out with little additional circuitry.
Insbesondere ist vorteilhaft, dass eine Antenne des Antennensystems zur Durchführung des Selbsttests auf Sendebetrieb umschaltbar ist, so dass zurIn particular, it is advantageous that an antenna of the antenna system can be switched to transmit mode for carrying out the self-test, so that
Funktionsüberprüfung des Antennensystems keine separate Antenne vorgesehen werden muss.Functional check of the antenna system no separate antenna must be provided.
Weiterhin ist vorteilhaft, dass die Prüffrequenz über die Steuereinheit durch- stimmbar ist, so dass eine umfassende und sichere Funktionsüberprüfung gewährleistet ist.It is also advantageous that the test frequency can be tuned via the control unit, so that a comprehensive and reliable function check is guaranteed.
Die Erfindung wird im Folgenden anhand der Zeichnung erläutert. Es zeigt:The invention is explained below with reference to the drawing. It shows:
Figur 1 : Blockschaltbild eines Ausfuhrungsbeispiels des erfindungsgemäßenFigure 1: Block diagram of an exemplary embodiment of the invention
Antennensystems. Figur 1 zeigt ein Ausfuhrungsbeispiel des erfindungsgemäßen Antennensystems 1. Das Antennensystem 1 ist Bestandteil einer mobilen Rundfunkempfangsanlage, welche im vorliegenden Beispiel in einem Kraftfahrzeug eingebaut ist.Antenna system. FIG. 1 shows an exemplary embodiment of the antenna system 1 according to the invention. The antenna system 1 is part of a mobile radio reception system, which in the present example is installed in a motor vehicle.
Das Antennensystem 1 weist mehrere Antennen 2 auf, welche vorzugsweise in der Heckscheibe des Kraftfahrzeugs integriert sind. Die Antennen 2 können unterschiedlich ausgebildet sein und zum Empfang von Rundfunksignalen unterschiedlicher Frequenzbereiche dienen. Zudem können einzelne Antennen 2 auch zum Empfang von Zusatzsignalen vorgesehen sein, die beispielsweise für die Zentralverriegelung des Kraftfahrzeugs dienen.The antenna system 1 has a plurality of antennas 2, which are preferably integrated in the rear window of the motor vehicle. The antennas 2 can be designed differently and can be used to receive radio signals of different frequency ranges. In addition, individual antennas 2 can also be provided for receiving additional signals, which are used, for example, for the central locking of the motor vehicle.
Die Antennen 2 sind über ein Kombinationsgerät 3 an zwei Empfänger 4, 4' angeschlossen. Prinzipiell können auch mehr als zwei Empfanger 4, 4' ange- schlössen sein. Die Ausgänge der Empfängereinheit sind auf eine Signalverarbeitungseinheit 5 geführt, die von einer analogen, integrierten Schaltung oder einem digitalen Signalprozessor gebildet ist.The antennas 2 are connected to two receivers 4, 4 'via a combination device 3. In principle, more than two receivers 4, 4 'can also be connected. The outputs of the receiver unit are routed to a signal processing unit 5, which is formed by an analog, integrated circuit or a digital signal processor.
Das Kombinationsgerät 3 ist von einer Schaltungslogik gebildet, mittels derer auf jeden der Empfänger 4, 4' eine vorgegebene Kombination von Antennen 2 schaltbar ist. Somit wird mit dem Kombinationsgerät 3 eine Auswahl getroffen, welche Antennen 2 den einzelnen Empfängern 4, 4' zugeordnet werden.The combination device 3 is formed by a circuit logic, by means of which a predetermined combination of antennas 2 can be switched to each of the receivers 4, 4 '. The combination device 3 thus makes a selection as to which antennas 2 are assigned to the individual receivers 4, 4 '.
Die Empfanger 4, 4' sind als Überlagerungsempfänger mit im Wesentlichen identischem Aufbau ausgebildet.The receivers 4, 4 'are designed as superimposed receivers with an essentially identical structure.
Dabei weist jeder der Empfänger 4, 4' einen Mischer 6, 6' auf, an dessen erstem Eingang ein Oszillator 7, T angeschlossen ist. Von einem Ausgang des Kombinationsgeräts 3 fuhrt eine Zuleitung über ein erstes Bandpassfilter 8, 8' auf einen zweiten Eingang des Mischers 6, 6'. Der Ausgang des Mischers 6, 6' ist über ein zweites Bandpassfilter 9, 9" zu der Signalverarbeitungseinheit 5 geführt. Das erste Bandpassfilter 8, 8' ist auf die Frequenz der mit den Antennen 2 empfangenen Rundfunksignale abgestimmt. Das gefilterte Ausgangssignal des Kombinationsgeräts 3 und das Signal des Oszillators 7, 7' werden im Mischer 6, 6' gemischt, wodurch aus dem hochfrequenten Rundfunksignal ein niederfrequenteres Zwischenfrequenzsignal generiert wird. Die Zwischenfrequenz entspricht dabei der Differenz der Frequenzen des Rundfunksignals und des Oszillators 7, 7'. Das Zwischenfrequenzsignal wird dann in dem zweiten, auf die Zwischenfrequenz fest eingestellten Bandpassfilter 9, 9' gefiltert. Das so erhaltene Ausgangssignal des jeweiligen Empfängers 4, 4' wird in der Signalverarbeitungseinheit 5 weiterverarbeitet.Each of the receivers 4, 4 'has a mixer 6, 6', to the first input of which an oscillator 7, T is connected. A supply line leads from an output of the combination device 3 via a first bandpass filter 8, 8 'to a second input of the mixer 6, 6'. The output of the mixer 6, 6 'is led to the signal processing unit 5 via a second bandpass filter 9, 9 ". The first bandpass filter 8, 8 'is tuned to the frequency of the radio signals received with the antennas 2. The filtered output signal of the combination device 3 and the signal of the oscillator 7, 7 'are mixed in the mixer 6, 6', as a result of which a lower-frequency intermediate-frequency signal is generated from the high-frequency broadcast signal. The intermediate frequency corresponds to the difference between the frequencies of the broadcast signal and the oscillator 7, 7 '. The intermediate frequency signal is then filtered in the second bandpass filter 9, 9 'which is permanently set to the intermediate frequency. The output signal of the respective receiver 4, 4 'obtained in this way is further processed in the signal processing unit 5.
Das Kombinationsgerät 3 wird über eine Steuereinheit 10 gesteuert, die vorzugsweise von einem Microcontroller gebildet ist. Auch die Oszillatoren 7, 7' der Empfänger 4, 4" werden von der Steuereinheit 10 gesteuert.The combination device 3 is controlled by a control unit 10, which is preferably formed by a microcontroller. The oscillators 7, 7 'of the receivers 4, 4 "are also controlled by the control unit 10.
Erfindungsgemäß wird zur Überprüfung der Funktionsfähigkeit ein Selbsttest durchgeführt. Der Selbsttest wird vorzugsweise während vorgegebener Zeitintervalle durchgeführt, welche den Regelbetrieb des Antennensystems 1 unterbrechen. Typischerweise erfolgt ein derartiger Selbsttest nach erfolgtem Zu- sammenbau eines Kraftfahrzeugs, während der Stillstandszeiten eines Kraftfahrzeugs in einer Werkstatt und bei Einschalten der Rundftinkempfangsanlage. Die Durchführung und Steuerung des Selbsttests erfolgt dabei zentral über die Steuereinheit 10.According to the invention, a self-test is carried out to check the functionality. The self-test is preferably carried out during predetermined time intervals which interrupt the normal operation of the antenna system 1. Typically, such a self-test takes place after a motor vehicle has been assembled, during a vehicle's downtime in a workshop and when the radio receiver system is switched on. The self-test is carried out and controlled centrally via the control unit 10.
Zur Steuerung des Selbsttests ist insbesondere ein an die Steuereinheit 10 angeschlossener Schalter 11 vorgesehen. Der Schalter 11 ist an einer Zuleitung angeordnet, welche den Oszillator 7 des ersten Empfängers 4 mit dem Kombinationsgerät 3 verbindet.In particular, a switch 11 connected to the control unit 10 is provided to control the self-test. The switch 11 is arranged on a feed line which connects the oscillator 7 of the first receiver 4 to the combination device 3.
Zur Durchführung des Selbsttests ist am Ausgang des zweiten Empfangers 4" eine Pegelmesseinrichtung 12 vorgesehen. Die Pegelmesseinrichtung 12 ist an die Steuereinheit 10 angeschlossen, so dass die mit der Pegelmesseinrichtung 12 erfassten Empfangspegel in die Steuereinheit 10 zur weiteren Auswertung eingelesen werden können.To carry out the self-test, a level measuring device 12 is provided at the output of the second receiver 4 ″. The level measuring device 12 is on the control unit 10 is connected so that the received levels detected by the level measuring device 12 can be read into the control unit 10 for further evaluation.
Während des Regelbetriebs des Antennensystems 1 werden mit den AntennenDuring normal operation of the antenna system 1, the antennas
2 insbesondere Rundfunksignale empfangen. Dabei sind dies die Rundfunksignale des Radiosenders der aktuell in der Rundfunkempfangsanlage eingestellt ist.2 receive radio signals in particular. These are the radio signals from the radio station that is currently set in the radio reception system.
Auf den anderen Empfänger 4' oder 4 ist wenigstens eine weitere Antenne 2 geschaltet. In diesem Empfänger 4' oder 4 werden die Rundfunksignale zweckmäßigerweise zur Bereitstellung von Zusatzfunktionen für die Rundftinkempfangsanlage empfangen und ausgewertet. Derartige Zusatzfunktionen können insbesondere von Empfangs-Optimierungs-Funktionen wie zum Bei- spiel der RDS(Radio Data System)-Funktion gebildet sein.At least one further antenna 2 is connected to the other receiver 4 'or 4. The radio signals are expediently received and evaluated in this receiver 4 'or 4 in order to provide additional functions for the radio receiver system. Such additional functions can in particular be formed by reception optimization functions such as the RDS (Radio Data System) function.
Diese Funktion dient zur Optimierung des Empfangs eines bestimmten Radiosenders in der Rundftinkempfangsanlage.This function is used to optimize the reception of a specific radio station in the broadcast reception system.
Während die im ersten Empfänger 4 oder 4' empfangenen Rundfunksignale desWhile the broadcast signals received in the first receiver 4 or 4 '
Radiosenders über die Rundfunkempfangsanlage wiedergegeben werden, werden im Hintergrund die mit dem zweiten Empfänger 4' oder 4 empfangenen Rundfunksignale desselben Inhalts, die jedoch mit unterschiedlichen weiteren Frequenzen ausgesendet werden, ausgewertet. In der Signal verarbeitungsein- heit 5 wird dann untersucht, auf welcher Frequenz die Rundfunksignale desselben Inhalts optimal empfangen werden, d.h. für welche Frequenz die höchste Signalamplitude und/oder das beste Signal/Rauschverhältnis erhalten wird. Dann können über die Signalverarbeitungseinheit 5 automatisch die Rundfunksignale mit der optimalen Frequenz für die Wiedergabe ausgewählt werden.Radio stations are reproduced via the radio reception system, the radio signals of the same content received with the second receiver 4 'or 4, which are, however, transmitted with different additional frequencies, are evaluated in the background. The signal processing unit 5 then examines the frequency at which the radio signals of the same content are optimally received, i.e. for which frequency the highest signal amplitude and / or the best signal / noise ratio is obtained. Then the broadcast signals with the optimal frequency can be selected automatically for playback via the signal processing unit 5.
Der Regelbetrieb wird über die Steuereinheit 10 zu vorgegebenen Zeitpunkten unterbrochen, so dass dann jeweils das Antennensystem 1 in einen Prüfmodus zur Durchfuhrung eines Selbsttests umgeschaltet wird. Auch die Dauer des Selbsttests wird über die Steuereinheit 10 vorgegeben.The regular operation is carried out via the control unit 10 at predetermined times interrupted, so that the antenna system 1 is then switched to a test mode for carrying out a self-test. The duration of the self-test is also specified via the control unit 10.
Zu Beginn des Selbsttests wird über die Steuereinheit 10 der Schalter 11 geschlossen. Zudem wird von der Steuereinheit 10 ein Steuerbefehl in das Kombinationsgerät 3 eingegeben. Durch den Steuerbefehl wird in dem Kombinationsgerät 3 eine der Antennen 2 auf Sendebetrieb umgeschaltet. Die im Sendebetrieb betriebene Antenne 2 ist durch den geschlossenen Schalter 11 an den Oszillator 7 des ersten Empfängers 4 angeschlossen. Damit sendet die im Sendebetrieb betriebene Antenne 2 Prüfsignale mit einer Prüffrequenz aus, die durch den Oszillator 7 des ersten Empfängers 4 vorgegeben wird.At the beginning of the self-test, the switch 11 is closed via the control unit 10. In addition, the control unit 10 inputs a control command into the combination device 3. The control command in the combination device 3 switches one of the antennas 2 to transmit mode. The antenna 2 operated in transmission mode is connected to the oscillator 7 of the first receiver 4 by the closed switch 11. The antenna 2 operated in transmission mode thus sends out test signals with a test frequency which is predetermined by the oscillator 7 of the first receiver 4.
Zweckmäßigerweise handelt es sich bei der im Sendebetrieb betriebenen An- tenne 2 nicht um eine der Antennen 2 des Antennensystems 1, die zum aktuellen Empfang der Rundfunksignale verwendet werden.The antenna 2 operated in the transmission mode is expediently not one of the antennas 2 of the antenna system 1 which are used for the current reception of the radio signals.
Über die Steuereinheit 10 erfolgt weiterhin die Auswahl der während des Selbsttests zu überprüfenden Antennen 2, die vorzugsweise einzeln nacheinan- der über das Kombinationsgerät 3 an den zweiten Empfänger 4' angeschlossen werden.The control unit 10 also selects the antennas 2 to be checked during the self-test, which are preferably connected one after the other to the second receiver 4 'via the combination device 3.
Die von der im Sendebetrieb betriebenen Antenne 2 ausgesendeten Prüfsignale werden auf die an den zweiten Empfänger 4' angeschlossene, zu prüfende An- tenne 2 eingekoppelt. Die von dieser Antenne 2 empfangenen Prüfsignale werden im zweiten Empfänger 4' ausgewertet.The test signals emitted by the antenna 2 operated in the transmission mode are coupled to the antenna 2 to be tested and connected to the second receiver 4 '. The test signals received by this antenna 2 are evaluated in the second receiver 4 '.
Die Frequenz des zweiten Empfängers 4' ist dabei auf die Prüffrequenz, die imThe frequency of the second receiver 4 'is on the test frequency, which in the
Oszillator 7 des ersten Empfängers 4 generiert wird, abgestimmt. Liegt bei- spielsweise die Prüffrequenz bei 100 MHz, so ist das Bandpassfilter 8' des zweiten Empfängers 4 auf diese Prüffrequenz entsprechend abgestimmt. Auch der Oszillator 7' des zweiten Empfangers 4C ist auf die Prüffrequenz abgestimmt. Im vorliegenden Beispiel beträgt dessen Frequenz 110,7 MHz, so dass das Zwischenfrequenzsignal am Ausgang des Mischers 6' 10,7 MHz beträgt, wobei der nachgeordnete Bandpass auf diese Zwischenfrequenz abgestimmt ist.Oscillator 7 of the first receiver 4 is generated, tuned. For example, if the test frequency is 100 MHz, the bandpass filter 8 'of the second receiver 4 is matched to this test frequency. Also the oscillator 7 'of the second receiver 4 C is tuned to the test frequency. In the present example, its frequency is 110.7 MHz, so that the intermediate frequency signal at the output of the mixer 6 'is 10.7 MHz, the downstream bandpass being tuned to this intermediate frequency.
Zweckmäßigerweise ist über die Steuereinheit 10 die Prüffrequenz, d.h. die Frequenz des Oszillators 7 des ersten Empfängers 4 durchstimmbar. In entsprechender Weise wird dabei auch die Frequenz des Oszillators 7' des zweiten Empfängers 4' geändert.The test frequency, i.e. the frequency of the oscillator 7 of the first receiver 4 can be tuned. The frequency of the oscillator 7 'of the second receiver 4' is changed accordingly.
Die so gebildete Anordnung zur Durchführung des Selbsttests weist somit einen zweikanaligen Aufbau auf. Der erste Empfänger 4 mit der im Sendebetrieb betriebenen Antenne 2 bildet einen ersten Kanal, während der zweite Empfänger 4' mit der zu überprüfenden Antenne 2 den zweiten Kanal bildet.The arrangement thus formed for carrying out the self-test thus has a two-channel structure. The first receiver 4 with the antenna 2 operated in transmission mode forms a first channel, while the second receiver 4 ′ forms the second channel with the antenna 2 to be checked.
Die Prüfsignale werden von der Sendeantenne in die zu überprüfende Antenne 2 eingekoppelt. Die entsprechenden Empfangspegel am zweiten Empfängers 4' werden in der Pegelmesseinrichtung 12 erfasst und in die Steuereinheit 10 eingelesen.The test signals are coupled from the transmitting antenna into the antenna 2 to be checked. The corresponding reception levels at the second receiver 4 'are recorded in the level measuring device 12 and read into the control unit 10.
Dabei bilden die mit der Pegelmesseinrichtung 12 erfassten Empfangspegel Istwerte, die in der Steuereinheit 10 mit dort vorgegebenen und abgespeicherten Sollwerten verglichen werden. Zusätzlich oder alternativ können aus der Signalverarbeitungseinheit 5 aus den Ausgangssignalen des zweiten Empfän- gers 4' gewonnene empfangsqualitätsbewertende Signale als Istwerte in dieIn this case, the received levels recorded with the level measuring device 12 form actual values which are compared in the control unit 10 with setpoints which are specified and stored there. Additionally or alternatively, received quality-evaluating signals obtained from the signal processing unit 5 from the output signals of the second receiver 4 'can be included as actual values in the
Steuereinheit 10 eingelesen und dort wiederum mit geeigneten Sollwerten verglichen werden.Control unit 10 is read in and compared there again with suitable target values.
Generell liefert der Vergleich der Istwerte mit den Sollwerten in der Steuerein- heit 10 ein Maß für die Qualität der Signale, die mit der zu überprüfenden Antenne 2 empfangen werden. Vorzugsweise erfolgt der Vergleich der Istwerte mit den Sollwerten anhand von in der Steuereinheit 10 vorgegebenen Toleranzbändern. Eine hinreichend fehlerfreie Funktion des Antennensystems 1 liegt dann vor, wenn die Istwerte mit den Sollwerten innerhalb der jeweiligen Toleranzbänder übereinstimmen.In general, the comparison of the actual values with the target values in the control unit 10 provides a measure of the quality of the signals which are received by the antenna 2 to be checked. The actual values are preferably compared with the target values based on tolerance bands specified in the control unit 10. Adequate error-free functioning of the antenna system 1 is present when the actual values match the target values within the respective tolerance bands.
Bei der Funktionsprüfung werden vorzugsweise sämtliche für den Empfangsbetrieb benötigten Antennen 2 abgeprüft. Um diese möglichst sichere und umfassende Funktionsprüfung zu gewährleisten, wird während des Selbsttests die Prüffrequenz innerhalb eines vorgegebenen Frequenzbereichs verändert.During the functional test, all antennas 2 required for receiving operation are preferably checked. In order to ensure that the functional test is as safe and comprehensive as possible, the test frequency is changed within a predetermined frequency range during the self-test.
Bei Beenden des Selbsttests durch die Steuereinheit 10 wird der Schalter 11 wieder geöffnet und die während des Selbsttests im Sendebetrieb betriebene Antenne 2 wieder auf Empfangsbetrieb umgeschaltet. When the self-test is ended by the control unit 10, the switch 11 is opened again and the antenna 2 operated during the self-test in the transmission mode is switched back to the reception mode.

Claims

Schutzansprüche protection claims
1. Antennensystem (1) mit mehreren Antennen (2), welche in vorgegebenen Kombinationen über eine Kombinationseinheit an wenigstens zwei Emp- fänger (4, 4') anschließbar sind, mit einer Signalverarbeitungseinheit (5) zur Auswertung der Ausgangssignale der Empfänger (4, 4') und mit einer Steuereinheit (10), mittels derer zur Durchführung eines Selbsttests wenigstens eine der Antennen (2) auf Sendebetrieb schaltbar ist, wobei diese Antenne (2) mit einer über einen ersten Empfänger (4) vorgegebene Prüf- frequenz Prüfsignale sendet, welche in wenigstens eine weitere Antenne1. Antenna system (1) with several antennas (2), which can be connected in predetermined combinations via a combination unit to at least two receivers (4, 4 '), with a signal processing unit (5) for evaluating the output signals of the receivers (4, 4 ') and with a control unit (10) by means of which at least one of the antennas (2) can be switched to transmit mode in order to carry out a self-test, said antenna (2) sending test signals with a test frequency specified via a first receiver (4) which in at least one other antenna
(2) eingekoppelt sind, welche über das Kombinationsgerät (3) an den zweiten Empfänger (4') angeschlossen ist, dessen Frequenz auf die Prüffrequenz abgestimmt ist, und wobei zur Durchführung des Selbsttests die Empfangspegel des zweiten Empfängers (4') als Istwerte erfasst und mit vorgegebenen Sollwerten verglichen werden.(2) are coupled in, which is connected via the combination device (3) to the second receiver (4 '), the frequency of which is matched to the test frequency, and the reception level of the second receiver (4') is recorded as actual values for the self-test and compared with predetermined target values.
2. Antennensystem nach Anspruch 1, dadurch gekennzeichnet, dass die Empfanger (4, 4') jeweils von einem Überlagerungsempfänger gebildet sind, wobei jeder Empfänger (4, 4') einen Mischer (6, 6') aufweist, an welchen ein Oszillator (7, 7') angeschlossen ist, und wobei an der Ein- gangsseite und an der Ausgangsseite des Mischers (6, 6') jeweils ein2. Antenna system according to claim 1, characterized in that the receivers (4, 4 ') are each formed by a superimposed receiver, each receiver (4, 4') having a mixer (6, 6 ') to which an oscillator ( 7, 7 ') is connected, and one on the input side and one on the output side of the mixer (6, 6')
Bandpassfilter (8, 8', 9, 9') vorgesehen ist.Bandpass filter (8, 8 ', 9, 9') is provided.
3. Antennensystem nach Anspruch 2, dadurch gekennzeichnet, dass die Prüffrequenz für die während des Selbsttests im Sendebetrieb betriebene Antenne (2) mittels des Oszillators (7, 7') des ersten Empfängers (4) ge- neriert wird. 3. Antenna system according to claim 2, characterized in that the test frequency for the antenna (2) operated during the self-test in transmission mode is generated by means of the oscillator (7, 7 ') of the first receiver (4).
4. Antennensystem nach Anspruch 3, dadurch gekennzeichnet, dass der Oszillator (7, 7') des ersten Empfangers (4) über eine einen Schalter (1 1) aufweisende Zuleitung an das Kombinationsgerät (3) angeschlossen ist, wobei der Schalter (11) über die Steuereinheit (10) betätigbar ist.4. Antenna system according to claim 3, characterized in that the oscillator (7, 7 ') of the first receiver (4) is connected to the combination device (3) via a supply line having a switch (1 1), the switch (11) can be actuated via the control unit (10).
5. Antennensystem nach Anspruch 4, dadurch gekennzeichnet, dass der5. Antenna system according to claim 4, characterized in that the
Schalter (11) nur während der Durchführung des Selbsttests geschlossen ist.Switch (11) is only closed while the self-test is being carried out.
6. Antennensystem nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, dass dem Bandpass am Ausgang des zweiten Empfängers (4') eine Pegelmesseinrichtung (12) zur Bestimmung der Istwerte nachgeordnet ist.6. Antenna system according to one of claims 2 to 5, characterized in that the bandpass at the output of the second receiver (4 ') is followed by a level measuring device (12) for determining the actual values.
7. Antennensystem nach Anspruch 6, dadurch gekennzeichnet, dass die Pegelmesseinrichtung (12) an die Steuereinheit (10) angeschlossen ist, in welcher die Istwerte mit den in der Steuereinheit (10) abgespeicherten Sollwerten verglichen werden.7. Antenna system according to claim 6, characterized in that the level measuring device (12) is connected to the control unit (10), in which the actual values are compared with the setpoints stored in the control unit (10).
8. Antennensystem nach einem der Ansprüche 6 oder 7, dadurch gekennzeichnet, dass aus der Signalverarbeitungseinheit (5) Istwerte bildende empfangsqualitätsbewertende Signale in die Steuereinheit (10) zum Vergleich mit dort abgespeicherten Sollwerten eingelesen werden.8. Antenna system according to one of claims 6 or 7, characterized in that from the signal processing unit (5), actual value-forming signals evaluating reception quality are read into the control unit (10) for comparison with setpoint values stored there.
9. Antennensystem nach einem der Ansprüche 2 bis 8, dadurch gekennzeichnet, dass der Oszillator (7, 7') des zweiten Empfängers (4') während des Selbsttests auf die Prüffrequenz abgestimmt ist.9. Antenna system according to one of claims 2 to 8, characterized in that the oscillator (7, 7 ') of the second receiver (4') is tuned to the test frequency during the self-test.
10. Antennensystem nach einem der Ansprüche 2 bis 9, dadurch gekennzeichnet, dass die Frequenzen der Oszillatoren (1, 7') über die Steuerein- heit (10) einstellbar sind.10. Antenna system according to one of claims 2 to 9, characterized in that the frequencies of the oscillators (1, 7 ') are adjustable via the control unit (10).
1 1. Antennensystem nach Anspruch 10, dadurch gekennzeichnet, dass die Frequenzen der Oszillatoren 7, 7' zur Durchführung des Selbsttests in einem vorgegebenen Frequenzbereich verändert werden. 1 1. Antenna system according to claim 10, characterized in that the frequencies of the oscillators 7, 7 'for performing the self-test are changed in a predetermined frequency range.
12. Antennensystem nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass die Steuereinheit (10) von einem Microcontroller gebildet ist.12. Antenna system according to one of claims 1 to 11, characterized in that the control unit (10) is formed by a microcontroller.
13. Antennensystem nach einem der Ansprüche 1 bis 12, dadurch gekenn- zeichnet, dass dieses als Bestandteil einer Rundfunkempfangsanlage in einem Kraftfahrzeug integriert ist.13. Antenna system according to one of claims 1 to 12, characterized in that it is integrated as part of a radio reception system in a motor vehicle.
14. Antennensystem nach Anspruch 13, dadurch gekennzeichnet, dass die Antennen in der Heckscheibe des Kraftfahrzeugs integriert sind.14. Antenna system according to claim 13, characterized in that the antennas are integrated in the rear window of the motor vehicle.
15. Antennensystem nach Anspruch 13 oder 14, dadurch gekennzeichnet, dass während dessen Regelbetriebs mittels eines Empfängers (4) auf einer ersten Frequenz ausgesendete, von einer Kombination oder Auswahl von Antennen (2) empfangende Rundfunksignale zur Wiedergabe in der Rundfunkempfangsanlage verarbeitet werden, und dass mittels des weiteren Empfängers (4') auf einer zweiten Frequenz ausgesendete, von einer weiteren Antenne (2) empfangene Rundfunksignale verarbeitet werden, welche zur Bereitstellung von Zusatzfunktionen in der Rundfunkempfangsanlage in der Signalverarbeitungseinheit (5) weiterverarbeitet werden.15. Antenna system according to claim 13 or 14, characterized in that during its regular operation by means of a receiver (4) broadcast at a first frequency, from a combination or selection of antennas (2) receiving radio signals for playback in the radio receiving system are processed, and that Radio signals transmitted by a further antenna (2) and processed by the further receiver (4 ') are processed, which are further processed in the signal processing unit (5) to provide additional functions in the radio reception system.
16. Antennensystem nach Anspruch 15, dadurch gekennzeichnet, dass die Zusatzfunktionen von Empfangs-Optimierungs-Funktionen gebildet sind. 16. Antenna system according to claim 15, characterized in that the additional functions are formed by reception optimization functions.
BezugszeichenlisteLIST OF REFERENCE NUMBERS
(1) Antennensystem(1) Antenna system
(2) Antenne(2) antenna
(3) Kombinationsgerät(3) combination device
(4) Empfanger(4) Receiver
(4') Empfanger(4 ') receiver
(5) S ignal verarbeitungseinheit(5) Signal processing unit
(6) Mischer(6) mixer
(6') Mischer(6 ') mixer
(7) Oszillator(7) oscillator
(7') Oszillator(7 ') oscillator
(8) Bandpassfilter(8) bandpass filter
(8') Bandpassfilter(8 ') bandpass filter
(9) Bandpassfilter(9) bandpass filter
(9') Bandpassfilter(9 ') bandpass filter
(10) Steuereinheit(10) control unit
(H) Schalter(H) switch
(12) Pegelmesseinrichtung (12) level measuring device
EP01900420A 2000-11-20 2001-01-11 Antenna system Withdrawn EP1336264A1 (en)

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PCT/EP2001/000255 WO2002041537A1 (en) 2000-11-20 2001-01-11 Antenna system

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EP (1) EP1336264A1 (en)
JP (1) JP2004514373A (en)
DE (1) DE20019677U1 (en)
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JP2004514373A (en) 2004-05-13

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