EP1336264A1 - Systeme d'antennes - Google Patents

Systeme d'antennes

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Withdrawn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)
English (en)
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/fr
Withdrawn legal-status Critical Current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.

Landscapes

  • 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

L'invention concerne un système d'antennes (1) comprenant plusieurs antennes (2) qui peuvent être reliées à au moins deux récepteurs (4, 4') par l'intermédiaire d'une unité combinée. Ce système comprend une unité de traitement de signaux (5) servant à analyser les signaux de sortie des récepteurs (4, 4') et une unité de commande (10) au moyen de laquelle au moins une des antennes peut être commutée en mode émission pour effectuer un autotest. Cette antenne (2) émet des signaux de contrôle présentant une fréquence de contrôle prédéterminée par l'intermédiaire d'un premier récepteur (4), ces signaux étant injectés dans au moins une autre antenne (2) reliée, par l'intermédiaire de l'unité combinée (3), au deuxième récepteur (4'), dont la fréquence est accordée avec la fréquence de contrôle. Pour effectuer l'autotest, on prend les niveaux de réception du deuxième récepteur (4') comme valeurs réelles et on les compare aux valeurs théoriques prédéterminées. On obtient ainsi un système d'antennes permettant de réaliser un contrôle de fonctionnement à moindres frais.
EP01900420A 2000-11-20 2001-01-11 Systeme d'antennes Withdrawn EP1336264A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE20019677U 2000-11-20
DE20019677U DE20019677U1 (de) 2000-11-20 2000-11-20 Antennensystem
PCT/EP2001/000255 WO2002041537A1 (fr) 2000-11-20 2001-01-11 Systeme d'antennes

Publications (1)

Publication Number Publication Date
EP1336264A1 true EP1336264A1 (fr) 2003-08-20

Family

ID=7949046

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01900420A Withdrawn EP1336264A1 (fr) 2000-11-20 2001-01-11 Systeme d'antennes

Country Status (5)

Country Link
US (1) US7084808B2 (fr)
EP (1) EP1336264A1 (fr)
JP (1) JP2004514373A (fr)
DE (1) DE20019677U1 (fr)
WO (1) WO2002041537A1 (fr)

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Also Published As

Publication number Publication date
JP2004514373A (ja) 2004-05-13
WO2002041537A1 (fr) 2002-05-23
US20040058690A1 (en) 2004-03-25
US7084808B2 (en) 2006-08-01
DE20019677U1 (de) 2001-02-15

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