EP1701407A1 - Système de réception à antennes multiples dans véhicules - Google Patents

Système de réception à antennes multiples dans véhicules Download PDF

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Publication number
EP1701407A1
EP1701407A1 EP06004550A EP06004550A EP1701407A1 EP 1701407 A1 EP1701407 A1 EP 1701407A1 EP 06004550 A EP06004550 A EP 06004550A EP 06004550 A EP06004550 A EP 06004550A EP 1701407 A1 EP1701407 A1 EP 1701407A1
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EP
European Patent Office
Prior art keywords
frequency band
antenna system
frequency
antenna
signals
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Withdrawn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
EP06004550A
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German (de)
English (en)
Inventor
Peter Schaich
Jörg Müller
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 Car Communication GmbH
Original Assignee
Hirschmann Car Communication 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 Car Communication GmbH filed Critical Hirschmann Car Communication GmbH
Publication of EP1701407A1 publication Critical patent/EP1701407A1/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems

Definitions

  • the invention relates to a method for signal transmission in a multi-antenna system, as well as such a multi-antenna system for mobile applications in vehicles with multiple receiving trains according to the features of the respective preamble of the independent claims.
  • LMK long wave, medium wave, short wave
  • FIG. 1 a plant according to the prior art, as currently used on a large scale, is shown by way of example in FIG.
  • a plurality (eg, three or more) of antennas are used.
  • Each antenna signal is amplified by a suitable radio frequency amplifier and matched in the output impedance to the cable impedance of a cable.
  • a correspondingly adapted coaxial cable is used in each case.
  • the multi-antenna receiving system formed in the prior art in FIG. 4 consists of, for example, three receive trains 100, 200, 300, the receive trains 100, 200 being designed for FM reception and the reception train 300 for LMK reception.
  • the first receive train 100 comprises an antenna, to which a bandpass filter 102 (filter), an amplifier 103 and a further bandpass 104 are connected downstream.
  • the high-frequency signals received by the antenna 101 are processed accordingly and fed to an output A for further processing and reproduction of the received signals.
  • the receive trains 200, 300 likewise having an antenna 201, a bandpass filter 202, an amplifier 203 and a further bandpass filter 204.
  • the reception train 300 which has an antenna 301, an amplifier 302 and a downstream bandpass 303, has a similar structure. Via a crossover 400, the signals of the receive trains 200, 300 are combined and also provided at the output A for further processing and playback.
  • the frequency band of the reception train 200 (VHF) is approximately in the range of 88 to 108 megahertz, while the LMK frequency band in the range of about 150 kilohertz to 6.2 megahertz.
  • the two frequency bands of the receive trains 200, 300 differ by at least one power of ten, if not by several powers of ten, so that the summary of the crossover 400 no problems and in the further processing a separation and the associated separate reproduction of the signals is readily possible.
  • the combination of two signals of two receive trains in the same frequency band (eg the signals of the receive train 100 and the receive train 200) is basically not possible because after the summary by the crossover 400 in the subsequent processing and playback of the signals is not a separation is possible and thus there is a mixing of the signal contents, which is not desired.
  • the transmission of several antenna signals in the same frequency band takes place in each case via a separate line between the output of the receiving train and the downstream receiving device or the device for further processing of the antenna signals.
  • VHF the same frequency band
  • the use of multiple wires (in this case, coaxial cables) adds cost to cables and connectors. This increases but also the risk of assembly errors, cable breaks, breaks in the connectors and the like, so that such a system according to the prior art has a variety of sources of error that can be determined only after installation in the vehicle and its commissioning.
  • this late detection of errors is a considerable disadvantage, since the troubleshooting is very complex because the individual components of the entire system after their installation in the vehicle are no longer readily accessible.
  • the invention is therefore based on the object, a multi-antenna receiving system and a corresponding method for mobile applications in vehicles with multiple receiving trains in such a way that the cost of signal processing and the necessary equipment significantly reduced, in particular, cables and connectors should be saved.
  • the risk of errors occurring that is, sources of error are eliminated.
  • a method for signal transmission in a multi-antenna system is proposed, which is characterized in that the frequency band of a reception train is transformed into a frequency band differing from the at least one other frequency band, the signals of the respective frequency bands are transmitted via a coaxial line and the transmitted signals are returned to their respective frequency bands are divided or are immediately further processed in the transformed band and then fed to a receiver.
  • a common antenna line coaxial line
  • the signals received by one antenna are transmitted to another frequency range and transmitted together with the signals of another antenna which otherwise operates in the same frequency band (frequency range) on a particular single line.
  • the jointly transmitted antenna signals are again separated from one another and further processed on the receiver side (eg by a radio).
  • This processing, z. B. implementation of the received high-frequency signals in low-frequency signals to be reproduced and optionally processing and presentation of Nutzinhalten the signals is known per se, but not the subject of the invention.
  • the inventive method has the advantage that signals from the same frequency band, but different receiving trains, can be transmitted over a single coaxial line, which significantly reduces the cost of cables and connectors and thus the sources of error of the overall system can be reduced.
  • the multi-antenna system carries out a diagnosis in which a test signal, in particular a test signal spectrum, generated via at least one of the antennas, received by at least one of the other antennas, in particular all other antennas, and fed to the respective Empfangszug and evaluated at the end.
  • a test signal in particular a test signal spectrum
  • the multi-antenna system itself generates a test signal and thereby at least one of the antennas is used as the transmitting antenna. If this transmitting antenna emits the test signal on request of an operator, it is received by the remaining other antennas and processed in the usual way via the downstream receiving lines.
  • An evaluation can take place at the end of a respective receive train, in particular by comparing the radiated test signal with the received signal at the end of a respective receive train. By this comparison can be determined whether the respective Receiving train has received the signals correctly and processed and forwarded. If this is not the case, it can be concluded that a fault has occurred (eg cable break, failure of a filter of an amplifier or any other element in the receiving train). If such an error is detected, it can be corrected before installing the multi-antenna system in the vehicle or this system is not even installed in the vehicle. Alternatively, the systems are first assembled and tested in the vehicle. So you can test before panels etc. are applied or (which is also common) you do a final test and then fix a detected error. Thus, the method according to the invention advantageously makes the diagnosis clearer.
  • a fault eg cable break, failure of a filter of an amplifier or any other element in the receiving train.
  • the invention proposes in particular for realizing the method described above, a multi-antenna system for mobile applications in vehicles with multiple receiving trains, which is characterized in that at least a third Empfangskar is provided, the Empfangszug has at least one antenna and for receiving at least one further frequency band wherein transform means are provided for transforming the frequency band of a receive train into a frequency band different from the at least two other frequency bands, and summing means are provided for transmitting the signals of the respective frequency bands via a coaxial line, further comprising release means, which again split the transmitted signals into their respective frequency bands.
  • the invention proposes an advantageous multi-antenna system with which the signals of two identical frequency bands (eg, VHF) can be transmitted via a single line.
  • two identical frequency bands eg, VHF
  • FIG. 1 shows a multi-antenna system for mobile use in vehicles, which in this exemplary embodiment has three receiving trains 10, 20, 30.
  • the receiver 10 includes in a conventional manner an antenna 11, a filter (bandpass 12), a regulated amplifier 13 and another bandpass 14.
  • a filter for realizing the invention, in particular for performing the frequency division multiplexing, are still a mixer 15 and an oscillator 16th switched in the receive train 10.
  • Empfangszug another filter (bandpass 17) is connected.
  • the amplifier 13 should preferably be regulated in order to prevent excessive modulation of the mixer
  • the second reception train 20 likewise has an antenna 21, a bandpass filter 22, an amplifier 23 and a further bandpass 24.
  • the two receive trains 10, 20 are designed to receive two identical frequency bands (here, for example, VHF), so that via the antennas 11, 21 either the signals of a single transmitter, but with different reception quality or the signals of two different transmitters can be received in this frequency band.
  • This third Empfangszug 30 is formed in this embodiment for the reception of LMK signals, but may also be formed analogous to the Empfangszug 10 for VHF reception.
  • the outputs A 10, A 20, A 30 of the receive trains 10, 20, 30 is connected as a summing means, for example, a crossover 40, which is the output side connected to a coaxial cable 41 for signal transmission.
  • a further crossover network 42 is connected downstream as a separating means, the output signals of which are fed to receivers 43, 44.
  • One of the two receivers also contains the device for receiving LMK (after another crossover). Therefore, therefore, the one crossover could be provided with three outputs and three receivers downstream of the respective received frequency bands.
  • the mixer 15 and the oscillator 16 are present as transformation means, for example here in the receive train 10.
  • the original frequency band of the reception train 10 is transformed into a frequency band differing therefrom, which also differs from the frequency bands of the reception trains 20, 30.
  • the frequency bands (frequency ranges) at the outputs A 10, A 20, A 30 differ significantly from each other, in particular they are powers of ten apart.
  • FIG. 2 shows a frequency plan by means of which the transformation of the frequency band of a reception train (for example of the reception train 10) into such a frequency band which is not a usable frequency band for the multi-antenna system is carried out.
  • this LMK frequency band is, for example, in the range between 150 kilohertz and 6.2 megahertz.
  • the frequency bands of the Empfangs Komes 10 and 20 are in the VHF range, for example, between 88 megahertz and 108 megahertz.
  • the frequency bands of these two receive trains 10, 20 overlap, so that they can not be transmitted without interference or mutual interference via a single coaxial line without the inventive method.
  • the invention proposes, by means of the transformation means (15, 16), to transform the frequency band of the one reception train 10 into a shifted frequency band. This is done, for example, in such a way that the frequency band of the reception train 10 is shifted into a frequency band between 66 megahertz and 86 megahertz (referred to as VHF_shifted in FIG. 2).
  • This shifted frequency band is, for example, separated by one power of ten from the LMK frequency band and also separated from the frequency band of the second reception train 20.
  • the invention makes it possible that the output signals of the three receive trains 10, 20, 30 can be transmitted via a single coaxial line 41, without causing mutual interference or interference.
  • the separation of the individual transmitted frequency ranges from the transmitted frequency spectrum is readily possible after the transmission.
  • the at least two, preferably three frequency bands are thus transmitted, for example, via the coaxial line and then separated again by means of frequency-dependent switches.
  • the frequency plan shown in Figure 2 is merely exemplary.
  • the specified upper and lower limits of the respective frequency bands may also differ from each other, as well as their width, depending on which standard is broadcast in which country and received by the multi-antenna system.
  • the shifted frequency range need not be between the two outer frequency ranges, but may be shifted (as viewed in FIG. 2) or further to the right (that is, farther away from 108 megahertz).
  • the distance of the shifted frequency band to one of the other frequency bands may also be less than one power of ten or greater than the exemplified two megahertz.
  • antenna side for example, tracking filter are used.
  • Figure 3 shows, based on the multi-antenna system according to Figure 1, a multi-antenna system with a Diagnosee Medicarekelt.
  • the multi-antenna system according to Figure 3 an oscillator 50, a limiter 51, for example, generates a comb spectrum from a sine wave, and an amplifier 52, by means of which by limiting (limiter 51) and gain (by means of amplifier 52) a test signal is generated.
  • This is, for example, a test signal spectrum, preferably a comb spectrum, which is also in the FM frequency band.
  • the output of amplifier 52 is fed to antenna 11, which is used as a transmitting antenna (in the mode rather than functioning as a receive antenna for receive train 10).
  • This radiated test signal since it is in the same frequency band to which the reception train 20 is adapted to receive, it is also, possibly with a certain transmission loss, received by the antenna 21 of the Empfangs Komes 20.
  • This The received test signal can now be transmitted and processed in a manner known per se via the receiving train 20, the means 40, 41, 42 and supplied to the associated receiver 42, 44.
  • the received field strength, the level or other parameters of the radiated and received test signal can now be determined and based on which a decision can be made as to whether the received receive train (here, for example, 21 to 24, 40 to 42), ie the associated radio frequency Transmission link, in order or if there are errors.
  • the receiver 43 is configured to control the test signal generation by means of 50 to 52, which also includes that the generated test signal is applied to an input of the bandpass 12 and thereby z. B. the connection between the bandpass 12 and the amplifier 13 is interrupted.
  • the generated test signal (eg frequency, level or the like) must be known to the receiver 43 so that it can compare it with the output signal received and transmitted here, for example, by the second receive train 20.
  • the filters which are connected in the multi-antenna systems according to FIGS. 1 and 3 are preferably all designed as bandpasses, so that they pass only the useful frequency ranges and block the signals which lie below and above these useful frequency ranges.
  • the filters in particular the bandpasses, designed as a steep filter, thus a sharp signal separation is realized. It makes sense to form this steep filter, especially the steep bandpasses, as a ceramic filter, which have the required slope in the filtering.
  • the oscillator 16 according to FIG. 1 is also used for generating the test signal for transformation purposes. That is, oscillator 16 in FIG. 1 may be the same as oscillator 50 in FIG.
  • a switch must be made, namely that the oscillator once its signals to the mixer 15 (in Figure 1) and after switching to the filter 51 for test purposes (in Figure 3) outputs.
  • This switching can for example be done automatically by one of the receivers 43 or 44 or in any other way by an operator.
  • the reception train 30 (or also other reception trains not shown here) can be designed to receive signals in the VHF range.
  • the test signal generated and radiated by the reception train 10 could be processed and checked by both the reception train 20 and the reception train 30 (or other similar reception trains).
  • all receiving trains are not designed for FM reception, but for the LMK reception, so that with respect to the VHF reception and their diagnosis for other frequency bands, in particular the LMK frequency band, applies.
  • the second receive train then comprises transformation means which shift the received frequency range, e.g. In the range of 66 megahertz to 86 megahertz. This shifted frequency range is then also supplied to the crossover 40.
  • the third frequency range likewise comprises transformation means which transform the frequency range of this reception train, for example, into a frequency range from 44 megahertz to 64 megahertz, this transformed frequency range then likewise being supplied to the frequency divider 40. Further reception trains with corresponding transformation means and transformations of the frequency band in themselves from the aforementioned frequency bands different frequency bands, all of which are not useful frequency band, is also conceivable.

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  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
EP06004550A 2005-03-08 2006-03-07 Système de réception à antennes multiples dans véhicules Withdrawn EP1701407A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005011036 2005-03-08
DE102006010591A DE102006010591A1 (de) 2005-03-08 2006-03-06 Mehrantennen-Empfangssystem in Fahrzeugen

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Publication Number Publication Date
EP1701407A1 true EP1701407A1 (fr) 2006-09-13

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EP06004550A Withdrawn EP1701407A1 (fr) 2005-03-08 2006-03-07 Système de réception à antennes multiples dans véhicules

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US (1) US20060205369A1 (fr)
EP (1) EP1701407A1 (fr)
DE (1) DE102006010591A1 (fr)

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DE102004035064A1 (de) * 2004-07-20 2006-02-16 Receptec Gmbh Antennenmodul
CN2749181Y (zh) * 2004-12-28 2005-12-28 精恒科技集团有限公司 多天线接收输出处理装置
US7164385B2 (en) 2005-06-06 2007-01-16 Receptec Holdings, Llc Single-feed multi-frequency multi-polarization antenna
US8111196B2 (en) * 2006-09-15 2012-02-07 Laird Technologies, Inc. Stacked patch antennas
US7277056B1 (en) * 2006-09-15 2007-10-02 Laird Technologies, Inc. Stacked patch antennas
US7587183B2 (en) * 2006-12-15 2009-09-08 Laird Technologies, Inc. Multi-frequency antenna assemblies with DC switching
EP2658133A1 (fr) 2012-04-26 2013-10-30 Harman Becker Automotive Systems GmbH Système d'antennes multiples
EP2658134A1 (fr) 2012-04-26 2013-10-30 Harman Becker Automotive Systems GmbH Système d'antennes multiples
EP2690793B1 (fr) 2012-07-27 2015-07-01 Harman Becker Automotive Systems GmbH Système d'antennes multiples
DE102016211138A1 (de) * 2015-06-22 2016-12-22 Hirschmann Car Communication Gmbh Einspeisung hochfrequenter Signale an mehrere verschiedene breitbandige Abnehmer aus einer Antennenwirkfläche
KR101827706B1 (ko) * 2016-09-20 2018-02-12 현대자동차주식회사 차량 및 차량의 제어 방법
DE102017203993A1 (de) 2017-03-10 2018-09-13 Bayerische Motoren Werke Aktiengesellschaft Funkempfangssystem für digitales Radio und Fernsehen
US12459551B2 (en) 2019-10-14 2025-11-04 Athena Industrial Technologies Inc. Broken rail detector
EP4045378A4 (fr) 2019-10-14 2024-04-24 Athena Industrial Technologies INC. Détecteur de rail cassé
CN119314494B (zh) * 2024-12-16 2025-03-04 国网山东省电力公司济南供电公司 电缆缺陷识别的方法、装置、电子设备及存储介质

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EP1363352A1 (fr) * 2002-05-14 2003-11-19 Alps Electric Co., Ltd. Système d'antenne avec transmission de signaux à fibre optique pour véhicule

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Publication number Priority date Publication date Assignee Title
US5345602A (en) * 1991-09-07 1994-09-06 Blaupunkt Werke Gmbh Receiver with multiple antennas
EP0877440A1 (fr) * 1997-05-08 1998-11-11 Harada Industry Co., Ltd. Antenne à diversité à directivité variable
EP0898174A1 (fr) * 1997-08-18 1999-02-24 Fujitsu Limited Appareil Radar
EP1231672A2 (fr) * 2001-02-09 2002-08-14 Kabushiki Kaisha Toshiba Dispositif d' antenne pour un véhicule
EP1363352A1 (fr) * 2002-05-14 2003-11-19 Alps Electric Co., Ltd. Système d'antenne avec transmission de signaux à fibre optique pour véhicule

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DE102006010591A1 (de) 2006-09-14
US20060205369A1 (en) 2006-09-14

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