EP0329641B1 - Receiving device for signals transmitted on the basis of the IUR standard to vehicles, especially railway vehicles - Google Patents

Receiving device for signals transmitted on the basis of the IUR standard to vehicles, especially railway vehicles Download PDF

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Publication number
EP0329641B1
EP0329641B1 EP89890036A EP89890036A EP0329641B1 EP 0329641 B1 EP0329641 B1 EP 0329641B1 EP 89890036 A EP89890036 A EP 89890036A EP 89890036 A EP89890036 A EP 89890036A EP 0329641 B1 EP0329641 B1 EP 0329641B1
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Prior art keywords
stages
signals
evaluation
frequencies
signal
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German (de)
French (fr)
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EP0329641A2 (en
EP0329641A3 (en
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Peter Hans Dipl.-Ing. Fischer
Karl Jelinek
Dobart Dipl.-Ing. Erwin
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Kapsch AG
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Kapsch AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L3/00—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal
    • B61L3/02—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control
    • B61L3/08—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically
    • B61L3/12—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically using magnetic or electrostatic induction; using radio waves
    • B61L3/126—Constructional details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B61—RAILWAYS
    • B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L3/00—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal
    • B61L3/02—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control
    • B61L3/08—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically
    • B61L3/12—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically using magnetic or electrostatic induction; using radio waves
    • B61L3/125—Devices along the route for controlling devices on the vehicle or train, e.g. to release brake or to operate a warning signal at selected places along the route, e.g. intermittent control simultaneous mechanical and electrical control controlling electrically using magnetic or electrostatic induction; using radio waves using short-range radio transmission

Definitions

  • the invention relates to the signal transmission between locally separated, stationarily arranged along a predetermined route, controlled by a central transceiver station and a mobile transceiver on a mostly track-bound vehicle following the route in question, based on the UIC standard (International Union of Railways).
  • UIC standard International Union of Railways
  • the signal transmission to the mobile transceiver takes place from the successive transceiver stations at alternating, equidistant transmission frequencies, with each mobile transceiver being set to the signal that is best received, which is usually the transmission frequency of the transmission closest to the vehicle -Reception station has.
  • the conventional mobile transceivers have only a single transposable transceiver channel and start a search (scanner principle) if an evaluation criterion is not satisfied until a transmission frequency is found at which a satisfactory signal quality is obtained. For reasons of time, however, it is not necessary to check whether this frequency is actually the cheapest of all the transmission frequencies available at the respective receiving location.
  • Approx. 30 - 100 ms are required to switch to a new signal frequency and to evaluate the signal quality.
  • this time can be up to 2 s.
  • Such observation and switchover times are generally not acceptable.
  • In systems with data transmission typically length of a data telegram approx. 100 ms
  • namely telegrams are lost entirely or at least partially. These telegrams would have to be sent repeatedly, which would lead to an increased load on the system (poor channel utilization). Whole syllables could be lost during voice transmission, which would lead to inquiries and thus longer talk times for inexperienced users.
  • the observation time could alternatively or cumulatively be shortened, the criterion for the switchover selected very low and the field strength in the coverage area selected to be greater than absolutely necessary.
  • the mobile transceiver remains at the selected signal frequency for as long as possible, although a much cheaper frequency would already be available.
  • DE-A-3 231 564 discloses a radio system for transmitting messages between transceiver stations moving along predetermined routes and fixed transceiver stations arranged along these routes at predetermined intervals, in which an alternating frequency change takes place along the route.
  • the received frequency-shifted RF transmission signals of the fixed transceiver stations are added in terms of power.
  • the invention now relates to a device for receiving signals transmitted on vehicles based on the UIC standard via locally separate transmission antennas on alternating equidistant transmission frequencies, in particular rail-bound vehicles, which use evaluation levels for the selection of the most favorable transmission frequency, whereby the input part of the receiver is designed to be broadband for all signal frequencies to be received, that band filters for dividing the signal frequencies transposed downwards in the input part into separate channels and then to these band filters separate mixing stages for transposing the signal frequencies in the separate channels downwards as well as separate amplifiers.
  • the optimum reception frequency can be selected at any time using a switching matrix. Since no frequencies have to be changed to switch from one receiving frequency to another and the observation of all channels takes place continuously, the typical switching times are less than 1 ms.
  • the receiver according to the invention avoids this effort considerably by using a first and second local oscillator common to all channels.
  • the effort required for this from different intermediate frequency filters for all channels is comparatively small in series production and technically much less problematic than the frequency synchronization of three oscillators.
  • Another advantage is the partial redundancy of the overall system.
  • the switching matrix can be implemented in terms of hardware, the software expenditure is considerably less than that of the conventional reception devices.
  • the input signals coming from connection 1 of a vehicle antenna used for transmitting and receiving in the simultaneous operation are fed to a duplex filter 2 which serves to separate the output signals of the mobile transceiver supplied via the transmitter output line 3 of the vehicle transceiver from the input signals thereof.
  • the input signals are received by the receiver input line 4 via a band filter 5, e.g. a helix filter, an input amplifier 6 and a further band filter 7, which can also be a helix filter, are fed to a mixer 8 which is supplied with a carrier frequency by a local oscillator 9 and is used to transpose the input signals to lower intermediate frequencies ZF1.
  • the intermediate-frequency input signals are fed to a signal divider 11, which feeds these signals to three parallel reception channels 12, 13 and 14. Up to the outputs of this signal divider, the entire common reception path with levels 4 to 11 is broadband, i.e. permeable for all transmission frequencies of the transceiver stations arranged along the route or for the intermediate frequencies ZF1 derived therefrom.
  • Separate narrow-band filters 15, 16 and 17 are connected to the output channels 12 to 14 of the signal divider 11, which are permeable to one of the intermediate frequencies ZF1, which are obtained by transposing the Equidistant signal frequencies can be obtained by means of the oscillator 9.
  • the intermediate frequencies ZF1 thus obtained are transposed to substantially lower intermediate frequencies ZF2 in three separate mixers 18, 19 and 20 by means of a carrier supplied by a second common oscillator 21 via a signal divider 22 and separate feed lines 23, 24 and 25, e.g. at 405, 455 and 505 kHz.
  • the signals with these intermediate frequencies IF2 are then amplified and demodulated in IF amplifiers and demodulators 26, 27, 28.
  • the demodulated signals which are, for example, low-frequency analog signals, are applied directly to the signal inputs of a switching matrix 32 via output lines 29, 30 and 31.
  • the switching of the signal inputs of the switching matrix 32 to its signal output 45 takes place automatically on the basis of a quality and quantity evaluation of the input signals.
  • quality amplification levels 33, 34 and 35 for example noise assessment levels
  • quantity assessment levels 39, 40 and 41 for example field strength assessment levels
  • the evaluation levels 33 to 35 and 39 to 41 supply the evaluation results in the form of digital switching signals via lines 36, 37 and 38 or 42, 43 and 44 to the control inputs of the switching matrix 32.
  • Noise evaluation stages providing digital signals are known under the name squelch, and field strength assessment stages are likewise known which deliver digital output signals via analog-digital converters and / or comparators.
  • the digital signals of the two types of evaluation stages 33 to 35 and 39 to 41 select in a manner known per se in the switching matrix 32 the highest quality of the input signals supplied via the input lines 29 and 31 to the switching matrix and output it to the output line 45. In this way, a practically uninterrupted readiness to receive is ensured under optimal reception conditions.
  • the intermediate frequency formation in the separate reception channels 12, 13 and 14 can also be carried out with the aid of three separate local oscillators, the frequencies of which are offset from one another by the frequency spacing of the equidistant transmission frequencies SF and which are thus mixed with the output frequencies of the channel filters 15 to 17, that the transposed frequencies are equal to each other.
  • the evaluation criteria can be achieved by using programmable logic components, i.e. by designing this matrix as a programmable logic matrix, can be freely selected and adapted to the respective application.
  • the evaluation criteria associated with the demodulated signal connected to line 45 in each case can be related to additional lines, e.g. to line 46 for the noise criterion and to lines 47 for the field strength criterion, for the purpose of further information of the consumer.
  • all other demodulated signals can also be forwarded on continuous, parallel reception channels for monitoring.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Radio Relay Systems (AREA)
  • Circuits Of Receivers In General (AREA)
  • Monitoring And Testing Of Transmission In General (AREA)

Description

Die Erfindung bezieht sich auf die Signalübertragung zwischen örtlich getrennten, längs einer vorgegebenen Fahrstrecke stationär angeordneten, von einer Zentrale gesteuerten Sende-Empfangsstationen und einem mobilen Sende-Empfangsgerät auf einem der betreffenden Fahrstrecke folgenden, meist schienengebundenen Fahrzeug auf der Basis der UIC-Norm (International Union of Railways). Die Signalübertragung zu dem mobilen Sende-Empfangsgerät erfolgt bei solchen Systemen von den aufeinanderfolgenden Sende-Empfangsstationen auf alternierenden äquidistanten Sendefrequenzen, wobei jedes mobile Sende-Empfangsgerät auf das jeweils am besten zu empfangende Signal eingestellt werden soll, welches meist die Sendefrequenz der dem Fahrzeug nächstgelegenen Sende-Empfangsstation hat.The invention relates to the signal transmission between locally separated, stationarily arranged along a predetermined route, controlled by a central transceiver station and a mobile transceiver on a mostly track-bound vehicle following the route in question, based on the UIC standard (International Union of Railways). In such systems, the signal transmission to the mobile transceiver takes place from the successive transceiver stations at alternating, equidistant transmission frequencies, with each mobile transceiver being set to the signal that is best received, which is usually the transmission frequency of the transmission closest to the vehicle -Reception station has.

Als Bewertungskriterien für die Signalqualität werden z.B. der Rauschabstand und/oder die Empfangsfeldstärke herangezogen (Rauschbewertung bzw. Feldstärkebewertung). Die bisher üblichen mobilen Sende-Empfangsgeräte haben nur einen einzigen transponierbaren Sende-Empfangskanal und beginnen bei Nichtbefriedigung eines Bewertungskriteriums mit einem Suchlauf (Scannerprinzip), bis eine Sendefrequenz gefunden wird, bei welcher eine zufriedenstellende Signalqualität erhalten wird. Aus Zeitgründen wird dabei aber darauf verzichtet, zu überprüfen, ob diese Frequenz tatsächlich die günstigste aller am jeweiligen Empfangsort verfügbaren Sendefrequenzen ist.As evaluation criteria for the signal quality e.g. the signal-to-noise ratio and / or the reception field strength are used (noise assessment or field strength assessment). The conventional mobile transceivers have only a single transposable transceiver channel and start a search (scanner principle) if an evaluation criterion is not satisfied until a transmission frequency is found at which a satisfactory signal quality is obtained. For reasons of time, however, it is not necessary to check whether this frequency is actually the cheapest of all the transmission frequencies available at the respective receiving location.

Für das Umschalten auf eine neue Signalfrequenz und das Bewerten der Signalqualität werden ca. 30 - 100 ms benötigt. Bei Systemen, bei denen eine längere Beobachtungszeit vorgeschrieben ist (z.B. gemäß UIC-Empfehlung, Punkt E 1.13.2 ungefähr 1 s), kann diese Zeit bis zu 2 s betragen. Solche Beobachtungs- und Umschaltzeiten sind in der Regel nicht tragbar. Bei Systemen mit Datenübertragung (typische Länge eines Datentelegrammes ca. 100 ms) könnten nämlich Telegramme zur Gänze oder mindestens teilweise verloren gehen. Diese Telegramme müßten wiederholt gesendet werden, was zu einer Mehrbelastung des Systems führen würde (schlechte Kanalausnutzung). Bei Sprachübertragung könnten ganze Silben verlorengehen, was bei ungeübten Benützern zu Rückfragen und damit zu längeren Gesprächszeiten führen würde.Approx. 30 - 100 ms are required to switch to a new signal frequency and to evaluate the signal quality. In systems where a longer observation time is required (e.g. according to UIC recommendation, point E 1.13.2 approx. 1 s), this time can be up to 2 s. Such observation and switchover times are generally not acceptable. In systems with data transmission (typical length of a data telegram approx. 100 ms) namely telegrams are lost entirely or at least partially. These telegrams would have to be sent repeatedly, which would lead to an increased load on the system (poor channel utilization). Whole syllables could be lost during voice transmission, which would lead to inquiries and thus longer talk times for inexperienced users.

Zur Behebung der beschriebenen Mängel könnte alternativ oder kumulativ die Beobachtungszeit verkürzt, das Kriterium für die Umschaltung sehr niedrig gewählt und die Feldstärke im Versorgungsgebiet größer als unbedingt nötig gewählt werden.To remedy the deficiencies described, the observation time could alternatively or cumulatively be shortened, the criterion for the switchover selected very low and the field strength in the coverage area selected to be greater than absolutely necessary.

Bei Verkürzung der Beobachtungs- und Umschaltzeit sind die UIC-Normen nicht immer erfüllbar und die Kriterien für die Signalbewertung werden sehr unsicher. Bei lokalen Überreichweiten, die meist geographisch bedingt und sehr begrenzt sind, wird dann der Kanal unnötig oft gewechselt. Dadurch ist eine optimale Erreichbarkeit des mobilen Sende-Empfangsgerätes nicht mehr sichergestellt.If the observation and switchover times are shortened, the UIC standards cannot always be met and the criteria for signal evaluation become very uncertain. In the case of local overreaches, which are mostly geographically dependent and very limited, the channel is then changed unnecessarily often. As a result, optimal accessibility of the mobile transceiver is no longer ensured.

Wird anderseits das Kriterium für die Umschaltung sehr niedrig gewählt, so bleibt das mobile Sende-Empfangsgerät so lange wie möglich bei der jeweils gewählten Signalfrequenz, obwohl schon eine wesentlich günstigere Frequenz verfügbar wäre.If, on the other hand, the criterion for the switchover is selected to be very low, the mobile transceiver remains at the selected signal frequency for as long as possible, although a much cheaper frequency would already be available.

Höhere Feldstärken haben schließlich naturgemäß höhere Störreichweiten zur Folge. Die einzelnen Signal-frequenzen können dann erst in sehr großen Abständen wiederholt werden und werden daher schlecht ausgenutzt.Ultimately, higher field strengths naturally result in higher interference ranges. The individual signal frequencies can then only be repeated at very large intervals and are therefore poorly used.

DE-A- 3 231 564 offenbart ein Funksystem zur Nachrichtenübertragung zwischen sich längs vorgegebener Strecken bewegenden Sende-Empfangsstationen und längs dieser Strecken in vorgegebenen Abständen angeordneten, ortsfesten Sende-Empfangsstationen, bei dem längs der Strecke ein alternierender Frequenzwechsel erfolgt. In einem breitbandigen Empfangsteil der beweglichen Sende-Empfangsstationen werden die empfangenen frequenzversetzten RF-Sendesignale der ortsfesten Sende-Empfangsstationen leistungsmäßig addiert. Außerdem ist aus diesem Dokument bekannt, Interferenzstörungen bei Funksystemen mit mehreren gleichmodulierten Sendern durch Verwendung ebensovieler diskreter Funkfrequenzen, die im Funkempfänger gesondert empfangen und ausgewertet werden, zu vermeiden. Das jeweils bestempfangene Sendesignal wird dabei ausgewählt.DE-A-3 231 564 discloses a radio system for transmitting messages between transceiver stations moving along predetermined routes and fixed transceiver stations arranged along these routes at predetermined intervals, in which an alternating frequency change takes place along the route. In a broadband reception section of the movable transceiver stations, the received frequency-shifted RF transmission signals of the fixed transceiver stations are added in terms of power. In addition, it is known from this document to avoid interference interference in radio systems with several identically modulated transmitters by using as many discrete radio frequencies, which are received and evaluated separately in the radio receiver. The best received broadcast signal is selected.

Die Erfindung betrifft nun eine Einrichtung zum Empfang von auf der Basis der UIC-Norm über örtlich getrennt angeordnete Sendeantennen auf alternierenden äquidistanten Sendefrequenzen übertragenen Signalen auf Fahrzeugen, insbesondere schienengebundenen Fahrzeugen, die unter Verwendung von Bewertungsstufen für die Auswahl der jeweils günstigsten Sendefrequenz, wobei der Eingangsteil des Empfängers breitbandig für alle zu empfangenden Signalfrequenzen ausgebildet ist, daß Bandfilter zur Aufteilung der im Eingangsteil gemeinsam nach unten transponierten Signalfrequenzen auf getrennte Kanäle und anschließend an diese Bandfilter getrennte Mischstufen zur Transponierung der Signalfrequenzen in den getrennten Kanälen nach unten sowie getrennte Verstärker- und Demodulatorstufen für diese transponierten Signalfrequenzen vorgesehen sind, und wobei je ein Ausgang der Verstärker- und Demodulatorstufen unmittelbar und zumindest ein weiterer Ausgang derselben mittelbar über eine Qualitäts- und/oder Quantitäts-Bewertungsstufe an eine Schaltmatrix zur Auswahl des jeweils bestbewerteten Signals für die weitere Verarbeitung angeschlossen sind.The invention now relates to a device for receiving signals transmitted on vehicles based on the UIC standard via locally separate transmission antennas on alternating equidistant transmission frequencies, in particular rail-bound vehicles, which use evaluation levels for the selection of the most favorable transmission frequency, whereby the input part of the receiver is designed to be broadband for all signal frequencies to be received, that band filters for dividing the signal frequencies transposed downwards in the input part into separate channels and then to these band filters separate mixing stages for transposing the signal frequencies in the separate channels downwards as well as separate amplifiers. and demodulator stages are provided for these transposed signal frequencies, and one output of each of the amplifier and demodulator stages and at least one further output of the same indirectly via a quality and / or quantity evaluation stage to a switching matrix for selection of the respectively best-rated signal for further processing are connected.

Da mit einem erfindungsgemäßen Empfänger alle Sende-frequenzen der Sende-Empfangsstation an der Fahrstrecke vom mobilen Sende-Empfangsgerät empfangen, demoduliert und bewertet werden, ist zu jedem Zeitpunkt bekannt, welche Frequenz die beste Signalqualität bietet. Demnach kann zu jedem Zeitpunkt die optimale Empfangsfrequenz mittels einer Schaltmatrix gewählt werden. Da für das Umschalten von einer Empfangsfrequenz auf eine andere keine Frequenzen geändert werden müssen und die Beobachtung aller Kanäle kontinuierlich stattfindet, liegen die typischen Umschaltzeiten unter 1 ms.Since with a receiver according to the invention all transmission frequencies of the transceiver on the route are received, demodulated and evaluated by the mobile transceiver, it is known at all times which frequency offers the best signal quality. Accordingly, the optimum reception frequency can be selected at any time using a switching matrix. Since no frequencies have to be changed to switch from one receiving frequency to another and the observation of all channels takes place continuously, the typical switching times are less than 1 ms.

Prinzipiell wäre ein Parallelempfang auch mit voneinander unabhängigen Empfängern möglich. Dies würde aber einen erheblich größeren Aufwand erfordern, da insbesondere bei äquidistanten Signalfrequenzen und einer Kanalzahl gleich oder größer als 3 zur Vermeidung von Intermodulationsproblemen die einzelnen Empfängeroszillatoren frequenzmäßig synchronisiert werden müßten. Der erfindungsgemäße Empfänger vermeidet insbesondere in bevorzugter Ausführung diesen Aufwand erheblich durch einen für alle Kanäle gemeinsamen ersten und zweiten Überlagerungs-Oszillator. Der hierzu erforderliche Aufwand von verschiedenen Zwischenfrequenzfiltern für alle Kanäle ist bei Serienfertigung vergleichsweise gering und technisch wesentlich unproblematischer als die Frequenzsynchronisation dreier Oszillatoren. Ein weiterer Vorteil ist eine teilweise Redundanz des Gesamtsystems.In principle, parallel reception would also be possible with mutually independent receivers. However, this would require a considerably greater outlay since, in particular in the case of equidistant signal frequencies and a number of channels equal to or greater than 3, the individual receiver oscillators would have to be synchronized in terms of frequency to avoid intermodulation problems. In a preferred embodiment, the receiver according to the invention avoids this effort considerably by using a first and second local oscillator common to all channels. The effort required for this from different intermediate frequency filters for all channels is comparatively small in series production and technically much less problematic than the frequency synchronization of three oscillators. Another advantage is the partial redundancy of the overall system.

Da die Schaltmatrix hardwaremäßig realisiert werden kann, ergibt sich ein wesentlich geringerer Softwareaufwand als bei den Empfangsgeräten herkömmlicher Bauart.Since the switching matrix can be implemented in terms of hardware, the software expenditure is considerably less than that of the conventional reception devices.

Ein Ausführungsbeispiel der Erfindung wird nun anhand der den Empfangsteil eines erfindungsgemäßen mobilen Sende-Empfangsgerätes darstellenden Zeichnung genauer erläutert.An embodiment of the invention will now be explained in more detail with reference to the drawing illustrating the receiving part of a mobile transceiver according to the invention.

Die vom Anschluß 1 einer im Simultanbetrieb zum Senden und Empfangen dienenden Fahrzeugantenne kommenden Eingangssignale werden einem Duplexfilter 2 zugeführt, das zur Trennung der über die Senderausgangsleitung 3 der Fahrzeugantenne zugeführten Ausgangssignale des mobilen Sende-Empfangsgerätes von den Eingangssignalen desselben dient. Die Eingangssignale werden von der Empfängereingangsleitung 4 über ein der Vorselektion dienendes Bandfilter 5, z.B. ein Helixfilter, einen Eingangsverstärker 6 und ein weiteres Bandfilter 7, das ebenfalls ein Helixfilter sein kann, einem Mischer 8 zugeführt, der von einem Überlagerungsoszillator 9 mit einer Trägerfrequenz versorgt wird und zum Transponieren der Eingangssignale auf niedrigere Zwischenfrequenzen ZF1 dient. Nach Verstärkung in einem ZF-Verstärker 10 werden die zwischenfrequenten Eingangssignale einem Signalteiler 11 zugeführt, welcher diese Signale drei parallelen Empfangskanälen 12, 13 und 14 zuführt. Bis zu den Ausgängen dieses Signalteilers ist der gesamte gemeinsame Empfangsweg mit den Stufen 4 bis 11 breitbandig ausgebildet, d.h. für alle Sendefrequenzen der längs der Fahrstrecke angeordneten Sende-Empfangsstationen bzw. für die daraus abgeleiteten Zwischenfrequenzen ZF1 durchlässig.The input signals coming from connection 1 of a vehicle antenna used for transmitting and receiving in the simultaneous operation are fed to a duplex filter 2 which serves to separate the output signals of the mobile transceiver supplied via the transmitter output line 3 of the vehicle transceiver from the input signals thereof. The input signals are received by the receiver input line 4 via a band filter 5, e.g. a helix filter, an input amplifier 6 and a further band filter 7, which can also be a helix filter, are fed to a mixer 8 which is supplied with a carrier frequency by a local oscillator 9 and is used to transpose the input signals to lower intermediate frequencies ZF1. After amplification in an IF amplifier 10, the intermediate-frequency input signals are fed to a signal divider 11, which feeds these signals to three parallel reception channels 12, 13 and 14. Up to the outputs of this signal divider, the entire common reception path with levels 4 to 11 is broadband, i.e. permeable for all transmission frequencies of the transceiver stations arranged along the route or for the intermediate frequencies ZF1 derived therefrom.

An die Ausgangskanäle 12 bis 14 des Signalteilers 11 sind getrennte Schmalbandfilter 15, 16 und 17 angeschlossen, die für je eine der Zwischenfrequenzen ZF1 durchlässig sind, welche durch Transponierung der äquidistanten Signalfrequenzen mittels des Oszillators 9 gewonnen werden. Nimmt man gemäß Zeichnung den einfachen Fall eines Systems mit nur 3 äquidistanten Signalfrequenzen SF mit einem Frequenzabstand von 50 kHz an und bezeichnet man die mittlere Zwischenfrequenz mit ZF1m, so ergeben sich für die Kanalfilter 15 bis 17 der Reihe nach die Durchlaßfrequenzen ZF1m-50 kHz, ZF1m und ZF1m+50 kHz, woraus sich beispielsweise für ZF1m = 21.400 MHz für die Kanalfilter 15 bis 17 die Durchlaßfrequenzen 21.350, 21.400 und 21.450 MHz ergeben.Separate narrow-band filters 15, 16 and 17 are connected to the output channels 12 to 14 of the signal divider 11, which are permeable to one of the intermediate frequencies ZF1, which are obtained by transposing the Equidistant signal frequencies can be obtained by means of the oscillator 9. Assuming, according to the drawing, the simple case of a system with only 3 equidistant signal frequencies SF with a frequency spacing of 50 kHz and designating the mean intermediate frequency with ZF1 m , the pass frequencies ZF1 m -50 result in turn for the channel filters 15 to 17 kHz, ZF1 m and ZF1 m +50 kHz, which results in the pass frequencies 21.350, 21.400 and 21.450 MHz for example for ZF1 m = 21.400 MHz for the channel filters 15 to 17.

Die so erhaltenen Zwischenfrequenzen ZF1 werden in drei getrennten Mischern 18, 19 und 20 mittels eines von einem zweiten gemeinsamen Oszillators 21 über einen Signalteiler 22 und getrennte Zuleitungen 23, 24 und 25 gelieferten Trägers auf wesentlich tiefere Zwischenfrequenzen ZF2 transponiert, z.B. auf 405, 455 und 505 kHz.The intermediate frequencies ZF1 thus obtained are transposed to substantially lower intermediate frequencies ZF2 in three separate mixers 18, 19 and 20 by means of a carrier supplied by a second common oscillator 21 via a signal divider 22 and separate feed lines 23, 24 and 25, e.g. at 405, 455 and 505 kHz.

Die Signale mit diesen Zwischenfrequenzen ZF2 werden anschließend in ZF-Verstärkern und Demodulatoren 26, 27, 28 verstärkt und demoduliert. Die demodulierten Signale, die beispielsweise niederfrequente Analogsignale sind, werden über Ausgangsleitungen 29, 30 und 31 unmittelbar an die Signaleingänge einer Schaltmatrix 32 angelegt.The signals with these intermediate frequencies IF2 are then amplified and demodulated in IF amplifiers and demodulators 26, 27, 28. The demodulated signals, which are, for example, low-frequency analog signals, are applied directly to the signal inputs of a switching matrix 32 via output lines 29, 30 and 31.

Die Durchschaltung der Signaleingänge der Schaltmatrix 32 auf deren Signalausgang 45 erfolgt automatisch auf Grund einer Qualitäts- und Quantitätsbewertung der Eingangssignale. Zu diesem Zweck sind an die Verstärker und Demodulatoren 26 bis 28 Qualitätsbewertungsstufen 33, 34 und 35, z.B. Rauschbewertungsstufen, sowie Quantitätsbewertungsstufen 39, 40 und 41, z.B. Feldstärkenbewertungsstufen, angeschlossen. Die Bewertungsstufen 33 bis 35 und 39 bis 41 führen die Bewertungsergebnisse in Form digitaler Schaltsignale über Leitungen 36, 37 und 38 bzw. 42, 43 und 44 den Steuereingängen der Schaltmatrix 32 zu. Digitalsignale liefernde Rauschbewertungsstufen sind unter der Bezeichnung Squelch bekannt, und ebenso bekannt sind Feldstärkenbewertungsstufen, die über Analog-Digitalwandler und/oder Komparatoren digitale Ausgangssignale liefern.The switching of the signal inputs of the switching matrix 32 to its signal output 45 takes place automatically on the basis of a quality and quantity evaluation of the input signals. For this purpose, quality amplification levels 33, 34 and 35, for example noise assessment levels, and quantity assessment levels 39, 40 and 41, for example field strength assessment levels, are connected to the amplifiers and demodulators 26 to 28. The evaluation levels 33 to 35 and 39 to 41 supply the evaluation results in the form of digital switching signals via lines 36, 37 and 38 or 42, 43 and 44 to the control inputs of the switching matrix 32. Noise evaluation stages providing digital signals are known under the name squelch, and field strength assessment stages are likewise known which deliver digital output signals via analog-digital converters and / or comparators.

Die Digitalsignale der beiden Arten von Bewertungsstufen 33 bis 35 bzw. 39 bis 41 wählen in an sich bekannter Weise in der Schaltmatrix 32 das qualitativ hochwertigste der über die Eingangsleitungen 29 und 31 der Schaltmatrix zugeführten Eingangssignale aus und geben es an die Ausgangsleitung 45 ab. Auf diese Weise wird eine praktisch ununterbrochene Empfangsbereitschaft unter optimalen Empfangsbedingungen gesichert.The digital signals of the two types of evaluation stages 33 to 35 and 39 to 41 select in a manner known per se in the switching matrix 32 the highest quality of the input signals supplied via the input lines 29 and 31 to the switching matrix and output it to the output line 45. In this way, a practically uninterrupted readiness to receive is ensured under optimal reception conditions.

Das beschriebene Ausführungsbeispiel läßt im Rahmen der Erfindung verschiedene Abwandlungen zu. So kann beispielsweise die Zwischenfrequenzbildung in den getrennten Empfangskanälen 12, 13 und 14 auch mit Hilfe von drei getrennten Überlagerungsoszillatoren vorgenommen werden, deren Frequenzen um den Frequenzabstand der äquidistanten Sendefrequenzen SF gegeneinander versetzt sind und die so mit den Ausgangsfrequenzen der Kanalfilter 15 bis 17 gemischt werden, daß die transponierten Frequenzen untereinander gleich sind.The exemplary embodiment described allows various modifications within the scope of the invention. For example, the intermediate frequency formation in the separate reception channels 12, 13 and 14 can also be carried out with the aid of three separate local oscillators, the frequencies of which are offset from one another by the frequency spacing of the equidistant transmission frequencies SF and which are thus mixed with the output frequencies of the channel filters 15 to 17, that the transposed frequencies are equal to each other.

Ferner können in der Schaltmatrix 32 die Bewertungskriterien durch Verwendung von programmierbaren Logikbauteilen, d.h. durch Ausbildung dieser Matrix als programmierbare Logikmatrix, frei gewählt und den jeweiligen Anwendungsfällen angepaßt werden. Überdies können die zu dem jeweils zur Leitung 45 durchgeschalteten demodulierten Signal gehörigen Bewertungskriterien zu zusätzlichen Leitungen, z.B. zur Leitung 46 für das Rauschkriterium und zu den Leitungen 47 für das Feldstärkekriterium, zwecks weiterer Information des Verbrauchers ebenfalls durchgeschaltet werden. Schließlich können zur Überwachung zusätzlich zum ausgewählten Signal an der Leitung 45 auch alle übrigen demodulierten Signale auf durchgehenden parallelen Empfangskanälen weitergeleitet werden.Furthermore, in the switching matrix 32, the evaluation criteria can be achieved by using programmable logic components, i.e. by designing this matrix as a programmable logic matrix, can be freely selected and adapted to the respective application. In addition, the evaluation criteria associated with the demodulated signal connected to line 45 in each case can be related to additional lines, e.g. to line 46 for the noise criterion and to lines 47 for the field strength criterion, for the purpose of further information of the consumer. Finally, in addition to the selected signal on line 45, all other demodulated signals can also be forwarded on continuous, parallel reception channels for monitoring.

Claims (6)

  1. Apparatus for the reception of signals on vehicles, particularly railborne vehicles, which signals have been transmitted on alternating equidistant transmitter frequencies from locally spaced transmitting antennas, with the use of evaluation stages for the selection of the in each case best rated transmitter frequency, wherein the input section (4-11) of the receiver is of broadband type for all signal frequencies to be received, wherein bandpass filters (15-17) are provided for splitting the signal frequencies (ZF2) which have been commonly transposed downwards in the input section (4-11) into separate channels (12-14), and wherein subsequently to these bandpass filters (15-17) separate mixing stages (18-20) are provided for transposing the signal frequencies (ZF2) in the separate channels (12-14) downwards, and wherein separate amplifier and demodulator stages (26-28) are provided for these transposed signal frequencies (ZF2), and wherein one output (29-31) each of the amplifier and demodulator stages (26-28) is directly connected and at least one further output each is indirectly connected via a quality and/or quantity evaluation stage (33-35 and/or 39-41) to a switching matrix (32) for the selection of the in each case best rated signals for their further processing.
  2. Apparatus according to claim 1 characterized in that a common oszillator (21) is provided for the separate mixing stages (18-20).
  3. Apparatus according to claim 1 or 2 characterized in that the quality evaluation stages (33-35) are noise evaluation stages with digital output signals.
  4. Apparatus according to any of the claims 1 to 3 characterized in that the quantity evaluation stages (39-41) are field intensity evaluation stages with digital output signals.
  5. Apparatus according to any of the claims 1 to 4, characterized in that the switching matrix (32) has, in addition to the output (45) for the best rated signal, also outputs (46 and/or 47) for the quality and/or quantity evaluation signals.
  6. Apparatus according to any of the claims 1 to 5, characterized in that the switching matrix (32) is a programmable logic matrix for the adjustment of the evaluation criterias to different applications.
EP89890036A 1988-02-15 1989-02-10 Receiving device for signals transmitted on the basis of the IUR standard to vehicles, especially railway vehicles Expired - Lifetime EP0329641B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0034088A AT391573B (en) 1988-02-15 1988-02-15 DEVICE FOR RECEIVING SIGNALS TRANSMITTED ON VEHICLES BASED ON THE UIC STANDARD, IN PARTICULAR RAILWAY VEHICLES
AT340/88 1988-02-15

Publications (3)

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EP0329641A2 EP0329641A2 (en) 1989-08-23
EP0329641A3 EP0329641A3 (en) 1992-01-22
EP0329641B1 true EP0329641B1 (en) 1994-06-01

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EP89890036A Expired - Lifetime EP0329641B1 (en) 1988-02-15 1989-02-10 Receiving device for signals transmitted on the basis of the IUR standard to vehicles, especially railway vehicles

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EP (1) EP0329641B1 (en)
AT (1) AT391573B (en)
BA (1) BA96108A (en)
CS (1) CS275720B6 (en)
DD (1) DD279134A5 (en)
DE (1) DE58907722D1 (en)
FI (1) FI94303C (en)
HR (1) HRP920604B1 (en)
HU (1) HU207188B (en)
PL (1) PL159890B1 (en)
RU (1) RU1838825C (en)
SI (1) SI8910331A (en)
UA (1) UA12996A (en)
YU (1) YU47301B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2112752B1 (en) * 1995-04-28 1998-12-16 Alcatel Standard Electrica RAILWAY COMMUNICATION SYSTEM.

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3158864A (en) * 1960-12-27 1964-11-24 Space General Corp Self-synchronizing communication system
DE1591556A1 (en) * 1967-09-28 1970-10-08 Siemens Ag Radio network comprising several stationary transmitting points and mobile receiving points
DE2242057B2 (en) * 1972-08-26 1975-11-20 Te Ka De Felten & Guilleaume Fernmeldeanlagen Gmbh, 8500 Nuernberg 60 M Hz carrier frequency system
CH594324A5 (en) * 1975-08-27 1978-01-13 Autophon Ag
DE3109849C2 (en) * 1981-03-14 1983-03-24 Blaupunkt-Werke Gmbh, 3200 Hildesheim Circuit arrangement for the identification of received transmitters with the same modulation content
JPS58172012A (en) * 1982-04-01 1983-10-08 Clarion Co Ltd Identical broadcast discriminating receiver
DE3231564A1 (en) * 1982-08-25 1984-03-01 Siemens AG, 1000 Berlin und 8000 München Radio system
DE3508900A1 (en) * 1985-03-13 1986-09-25 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Arrangement for obtaining a switching criterion from a field strength measurement

Also Published As

Publication number Publication date
FI890594A (en) 1989-08-16
BA96108A (en) 1998-12-28
CS8900929A2 (en) 1991-04-11
FI94303C (en) 1995-08-10
UA12996A (en) 1997-02-28
HRP920604B1 (en) 1997-10-31
HUT52900A (en) 1990-08-28
HU207188B (en) 1993-03-01
EP0329641A2 (en) 1989-08-23
PL159890B1 (en) 1993-01-29
AT391573B (en) 1990-10-25
PL277729A1 (en) 1989-09-04
ATA34088A (en) 1990-04-15
FI890594A0 (en) 1989-02-08
EP0329641A3 (en) 1992-01-22
HRP920604A2 (en) 1994-04-30
DD279134A5 (en) 1990-05-23
YU33189A (en) 1992-07-20
YU47301B (en) 1995-01-31
FI94303B (en) 1995-04-28
DE58907722D1 (en) 1994-07-07
RU1838825C (en) 1993-08-30
CS275720B6 (en) 1992-03-18
SI8910331A (en) 1997-02-28

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