EP0258838A2 - Process for actualizing the local time of a user of an information tranfer system - Google Patents

Process for actualizing the local time of a user of an information tranfer system Download PDF

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Publication number
EP0258838A2
EP0258838A2 EP87112555A EP87112555A EP0258838A2 EP 0258838 A2 EP0258838 A2 EP 0258838A2 EP 87112555 A EP87112555 A EP 87112555A EP 87112555 A EP87112555 A EP 87112555A EP 0258838 A2 EP0258838 A2 EP 0258838A2
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Prior art keywords
time
user system
oscillator
day
clock
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German (de)
French (fr)
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EP0258838A3 (en
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Herbert Dipl.-Ing. Gross
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Siemens AG
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Siemens AG
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04R—RADIO-CONTROLLED TIME-PIECES
    • G04R20/00—Setting the time according to the time information carried or implied by the radio signal

Definitions

  • the invention relates to a method for updating the time generated locally by means of a time transmitter of a time-controlled input parameter, in particular a key, changing user system in an information transmission system having a plurality of such user systems and operating with a changing time input parameter (key) using a reference clock timer just like the local time transmitter located in the user system consists of an oscillator and a time processor.
  • a clock with corresponding accuracy must be available for the provision of these input parameters.
  • the timers of the individual user systems are compared in a known time interval with a time reference and updated so that the time deviation resulting from tolerances does not become so great that the system falls out of step.
  • the time generator in the user system and also in the reference device usually consists of a time processor and an oscillator, which is required for permanent updating of the time.
  • the determined time store When comparing the time of the user system with that of a reference device, the determined time store is generally used to update the data in the time processor of the user system.
  • the time intervals after which this comparison must be repeated depend on the oscillator stability of the user system and the system requirements. A change in the oscillator properties with regard to frequency stability and frequency offset thus has a significant influence on the necessary adjustment intervals.
  • the object of the invention is to provide a method for updating the time generated locally in the user system, with which a statement about the frequency accuracy of the oscillator in the user system can be obtained even without regular comparison intervals. It should not be important for the method whether the comparison is made through a physical contact or via the radio path, since when processing is carried out via the radio path, appropriate devices can be added to the system which bring about a runtime correction.
  • this object is achieved in that the current time data record is transferred from the time processor of the user system to be updated when the user system is started up and immediately afterwards the clock of the oscillator for loading the time processor is released at the user system and the time of transfer of the current time data record is stored in an update time memory that after any time intervals the time data of the time processor of the user system to be updated with the time data of the time processor of the reference clock timer in be compared to a comparator, that the time storage data determined in the comparator together with the time data, which characterize the time of commissioning or a previous comparison and are stored in the update time memory of the user system, and with the current time data of the time processor of the reference clock timer are fed to an evaluator, in which the average frequency accuracy of the oscillator in the clock of the respective user system is determined from this data.
  • the mean frequency accuracy of the oscillator of the user system clock, determined in the evaluator, is used to determine the time intervals between the time comparisons used for the update, such that the time interval between successive time comparisons becomes large for small frequency deviations and this time interval becomes smaller for larger frequency deviations.
  • an oscillator with a frequency re-tuning device can be used in the clock of the user system, which is actuated when the mean frequency inaccuracy of the oscillator of the user system clock determined in the evaluator becomes so great that a very short time interval between successive time comparisons would be required.
  • the current data record of the time processor 11 is transferred to a reference device 2 via a transmission channel 9b to the time processor 5 of the user system 1 to be tracked.
  • a reference device 2 in addition to the time processor 11, an oscillator 12 which clocks the processor 11 belongs to the time generator 10.
  • the time generator 3 of the user system 1 consists of the time processor 5 and the oscillator 4.
  • the oscillator 12 in the reference device 2 is usually considerably more stable in frequency than the oscillator 4 in the user system 1.
  • the clock of the oscillator 4 is released and the time of transfer is stored in an update time memory 6. For later time comparisons, the time of the update, i.e. of the last time comparison made.
  • the time data of the user system to be tracked is checked with that of the reference device 2 in a comparator 13.
  • the time of day data transmission from the time processor 5 of the user system 1 to the comparator 13 in the reference device 2 takes place via a transmission channel 9c.
  • the time storage is compared to the reference device 2 together with the data indicating the time of the previous comparison or characterize the first commissioning and are stored in the update time memory 6, and are fed to the evaluator 14 with the current time data of the time processor 11 in the time generator 10 of the reference device 2.
  • the data of the previous comparison or of the first start-up stored in the update time memory 6 are input to the evaluator 14 in the reference device 2 via a transmission channel 9d.
  • Information 15 about the mean frequency accuracy for the time interval under consideration can be determined from the time data supplied to the evaluator 14.
  • the information 15 about the frequency accuracy of the oscillator 4 can be used to determine the time intervals between the necessary time comparisons with regard to their distance.
  • an oscillator 4 is used with a frequency re-tuning device 7, which is actuated when the mean frequency inaccuracy of the oscillator 4 of the user system timer 3 determined in the evaluator 14 becomes so great that a too short time interval between successive time comparisons would be required.
  • the oscillator 4 in the user system 1 is tuned using a reference value transmitter 16.
  • the reference value present in the reference value transmitter 16 is input via a transmission channel 9a to a reference value memory 8 in the user system 1, which then adjusts the clock frequency of the oscillator 4 by means of the retuning device 7.
  • the transmission channels 9a to 9d represented by a block 9 are implemented, eg the comparison is made through a physical contact or via the radio path with serial data transfer (time division multiplex), since the system must have the appropriate facilities and methods for a runtime correction when processing via the radio path.
  • the runtime correction must be carried out in such a way that the use of mobile user systems is possible.

Abstract

The time-of-day offset of the local time-of-day clock (3), consisting of an oscillator (4) and a time-of-day processor (5), of the user system (1) is determined with respect to a reference time-of-day clock (10) by means of a comparator (13). Together with the time-of-day data, which contain the instant of startup or the preceding comparison and are stored in an updating instant memory (6), and with the updated time-of-day data of the reference time-of-day clock (10), these time-of-day offset data are then fed to an evaluator (14) in which the mean frequency accuracy of the oscillator (4) in the time-of-day clock (3) of the user system (1) is determined and can then be used both to adjust the temporal offsets of the time-of-day comparison intervals and for a frequency retuning of the oscillator (4) in the user system time-of-day clock (3). The invention can be applied in spatially separated systems, especially mobile systems, controlled by the time of day, eg information transfer systems operating with encoding and having a temporally changed code. <IMAGE>

Description

Die Erfindung bezieht sich auf ein Verfahren zum Aktua­lisieren der lokal mittels eines Uhrzeitgebers erzeugten Uhrzeit eines zeitgesteuert einen Eingangsparameter, insbesondere einen Schlüssel, ändernden Anwendersystems in einem mehrere solche Anwendersysteme aufweisenden, mit sich zeitlich änderndem Eingangsparameter (Schlüs­sel) arbeitenden Informationsübertragungssystem unter Verwendung eines Referenzuhrzeitgebers, der genauso wie der lokal beim Anwendersystem angeordnete Uhrzeitgeber aus einem Oszillator und einem Uhrzeitprozessor besteht.The invention relates to a method for updating the time generated locally by means of a time transmitter of a time-controlled input parameter, in particular a key, changing user system in an information transmission system having a plurality of such user systems and operating with a changing time input parameter (key) using a reference clock timer just like the local time transmitter located in the user system consists of an oscillator and a time processor.

Bei Verschlüsselungssystem, die zur Übertragung von In­formationen zeitabhängige Eingangsparameter, insbesonde­re Schlüssel, verwenden, muß für die Bereitstellung dieser Eingangsparameter ein Uhrzeitgeber mit entspre­chender Genauigkeit zur Verfügung stehen. Zur Gewähr­leistung der Funktion des Gesamtsystems werden in be­kannter Weise die Uhrzeitgeber der einzelnen Anwender­systeme in festgelegten Zeitintervallen mit einer Uhr­zeitreferenz verglichen und nachgeführt, damit die durch Toleranzen entstehende Zeitabweichung nicht so groß wird, daß das System außer Tritt fällt. Der Uhrzeitgeber im Anwendersystem und auch in der Referenzeinrichtung besteht gewöhnlich aus einem Uhrzeitprozessor und einem Oszillator, der zur permanenten Aktualisierung der Uhrzeit benötigt wird.In the case of an encryption system which uses time-dependent input parameters, in particular keys, for the transmission of information, a clock with corresponding accuracy must be available for the provision of these input parameters. To ensure the function of the overall system, the timers of the individual user systems are compared in a known time interval with a time reference and updated so that the time deviation resulting from tolerances does not become so great that the system falls out of step. The time generator in the user system and also in the reference device usually consists of a time processor and an oscillator, which is required for permanent updating of the time.

Beim Vergleich der Uhrzeit des Anwendersystems mit derjenigen einer Referenzeinrichtung wird im allgemeinen die ermittelte Zeitablage zum Aktualisieren der Daten im Uhrzeitprozessor des Anwendersystems verwendet. Die Zeitabstände, nach denen dieser Vergleich wiederholt werden muß, hängen von der Oszillatorstabilität des Anwendersystems und den Systemanforderungen ab. Eine Änderung der Oszillatoreigenschaften bezüglich Frequenz­stabilität und Frequenzversatz hat somit einen wesent­lichen Einfluß auf die notwendigen Abgleichintervalle.When comparing the time of the user system with that of a reference device, the determined time store is generally used to update the data in the time processor of the user system. The time intervals after which this comparison must be repeated depend on the oscillator stability of the user system and the system requirements. A change in the oscillator properties with regard to frequency stability and frequency offset thus has a significant influence on the necessary adjustment intervals.

Bei bekannten derartigen Informationsübertragungs­systemen ist die Messung der Oszillatoreigenschaften entsprechend der Genauigkeit mit einem relativ großen apparativen Aufwand verbunden gewesen und läßt sich im allgemeinen auch nur mittels eines physischen Kontaktes des zeitlich zu aktualisierenden Anwendersystems mit der Uhrzeit-Referenzeinrichtung durchführen.In known information transmission systems of this type, the measurement of the oscillator properties, in accordance with the accuracy, was associated with a relatively large outlay in terms of apparatus and can generally only be carried out by means of a physical contact of the user system to be updated with the time reference device.

Aufgabe der Erfindung ist es, ein Verfahren zum Aktuali­sieren der lokal beim Anwendersystem erzeugten Uhrzeit anzugeben, mit dem auch ohne regelmäßige Vergleichsin­tervalle eine Aussage über die Frequenzgenauigkeit des Oszillators im Anwendersystem gewonnen werden kann. Dabei soll es für das Verfahren nicht von Bedeutung sein, ob der Vergleich durch einen physischen Kontakt oder über den Funkweg erfolgt, da bei Abwicklung über den Funkweg dem System entsprechende Einrichtungen beigegeben werden können, welche eine Laufzeitkorrektur bewerkstelligen.The object of the invention is to provide a method for updating the time generated locally in the user system, with which a statement about the frequency accuracy of the oscillator in the user system can be obtained even without regular comparison intervals. It should not be important for the method whether the comparison is made through a physical contact or via the radio path, since when processing is carried out via the radio path, appropriate devices can be added to the system which bring about a runtime correction.

Gemäß der Erfindung, die sich auf ein Verfahren der eingangs genannten Art bezieht, wird diese Aufgabe dadurch gelöst, daß bei der Inbetriebnahme des Anwen­dersystems der aktuelle Uhrzeitdatensatz vom Uhrzeitpro­zessor des zu aktualisierenden Anwendersystems übergeben und unmittelbar danach beim Anwendersystem der Takt des Oszillators zur Beaufschlagung des Uhrzeitprozessors freigegeben und der Zeitpunkt der Übergabe des aktuellen Uhrzeitdatensatzes in einem Aktualisierungszeitpunkt-­Speicher abgelegt wird, daß nach beliebigen Zeitinter­vallen die Uhrzeitdaten des Uhrzeitprozessors des zu aktualisierenden Anwendersystems mit den Uhrzeitdaten des Uhrzeitprozessors des Referenzuhrzeitgebers in einem Komparator verglichen werden, daß die im Komparator ermittelten Zeitablagedaten zusammen mit den Uhrzeitda­ten, die den Zeitpunkt der Inbetriebnahme oder eines vorausgegangenen Vergleichs charakterisieren und im Aktualisierungszeitpunkt-Speicher des Anwendersystems abgelegt sind, sowie mit den aktuellen Uhrzeitdaten des Uhrzeitprozessors des Referenzuhrzeitgebers einem Auswerter zugeführt werden, in dem aus diesen Daten die mittlere Frequenzgenauigkeit des Oszillators im Uhrzeitgeber des jeweiligen Anwendersystems ermittelt wird.According to the invention, which relates to a method of the type mentioned at the outset, this object is achieved in that the current time data record is transferred from the time processor of the user system to be updated when the user system is started up and immediately afterwards the clock of the oscillator for loading the time processor is released at the user system and the time of transfer of the current time data record is stored in an update time memory that after any time intervals the time data of the time processor of the user system to be updated with the time data of the time processor of the reference clock timer in be compared to a comparator, that the time storage data determined in the comparator together with the time data, which characterize the time of commissioning or a previous comparison and are stored in the update time memory of the user system, and with the current time data of the time processor of the reference clock timer are fed to an evaluator, in which the average frequency accuracy of the oscillator in the clock of the respective user system is determined from this data.

Die im Auswerter ermittelte mittlere Frequenzgenauig­keit des Oszillators des Anwendersystem-Uhrzeitgebers wird zur Festlegung der Zeitintervalle zwischen den der Aktualisierung dienenden Uhrzeitvergleichen herange­zogen, derart, daß bei geringen Frequenzabweichungen das Zeitintervall zwischen aufeinanderfolgenden Uhrzeit­vergleichen groß und bei größeren Frequenzabwei­chungen dieses Zeitintervall kleiner wird. Darüber hinaus kann im Uhrzeitgeber des Anwendersystems ein Oszillator mit einer Frequenznachstimmeinrichtung verwendet werden, die dann betätigt wird, wenn die im Auswerter ermittelte mittlere Frequenzungenauigkeit des Oszillators des Anwendersystem-Uhrzeitgebers so groß wird, daß ein sehr kurzes Zeitintervall zwischen aufeinander folgenden Uhrzeitvergleichen erforderlich würde.The mean frequency accuracy of the oscillator of the user system clock, determined in the evaluator, is used to determine the time intervals between the time comparisons used for the update, such that the time interval between successive time comparisons becomes large for small frequency deviations and this time interval becomes smaller for larger frequency deviations. In addition, an oscillator with a frequency re-tuning device can be used in the clock of the user system, which is actuated when the mean frequency inaccuracy of the oscillator of the user system clock determined in the evaluator becomes so great that a very short time interval between successive time comparisons would be required.

Im folgenden wird anhand eines in einer Figur gezeigten Funktionsschaltbildes das Verfahren nach der Erfindung erläutert.The method according to the invention is explained below using a functional circuit diagram shown in a figure.

Bei der Inbetriebnahme eines Anwendersystems 1 wird der aktuelle Datensatz des Uhrzeitprozessors 11 einer Referenzeinrichtung 2 über einen Übertragungskanal 9b an den Uhrzeitprozessor 5 des nachzuführenden Anwender­systems 1 übergeben. In der Referenzeinrichtung 2 gehört zum Uhrzeitgeber 1O außer dem Uhrzeitprozessor 11 ein Oszillator 12, der den Prozessor 11 taktet. In gleicher Weise besteht der Uhrzeitgeber 3 des Anwendersystems 1 aus dem Uhrzeitprozessor 5 und dem Oszillator 4. Der Oszillator 12 in der Referenzeinrichtung 2 ist dabei gewöhnlich erheblich frequenzstabiler als der Oszillator 4 im Anwendersystem 1. Nach der Übergabe des aktuellen Datensatzes an den Uhrzeitprozessor 5 des Anwender­systems 1 wird der Takt des Oszillators 4 freigegeben und der Zeitpunkt der Übergabe in einem Aktualisie­rungszeitpunkt-Speicher 6 abgelegt. Bei späteren Zeit­vergleichen wird im Speicher 6 der Zeitpunkt der Aktu­alisierung, d.h. des jeweils zuletzt vorgenommenen Zeitvergleichs, abgelegt.When a user system 1 is started up, the current data record of the time processor 11 is transferred to a reference device 2 via a transmission channel 9b to the time processor 5 of the user system 1 to be tracked. In the reference device 2, in addition to the time processor 11, an oscillator 12 which clocks the processor 11 belongs to the time generator 10. In the same way, the time generator 3 of the user system 1 consists of the time processor 5 and the oscillator 4. The oscillator 12 in the reference device 2 is usually considerably more stable in frequency than the oscillator 4 in the user system 1. After the current data set has been transferred to the time processor 5 User system 1, the clock of the oscillator 4 is released and the time of transfer is stored in an update time memory 6. For later time comparisons, the time of the update, i.e. of the last time comparison made.

Bei einem späteren Vergleich mit dem Uhrzeit-Datensatz des Uhrzeitprozessors 11 der Referenzeinrichtung 2 werden die Uhrzeitdaten des nachzuführenden Anwender­systems mit denen der Referenzeinrichtung 2 in einem Komparator 13 überprüft. Die Uhrzeit-Datenübertragung vom Uhrzeitprozessor 5 des Anwendersystems 1 zum Komparator 13 in der Referenzeinrichtung 2 erfolgt über einen Übertragungskanal 9c. Zur Bestimmung der Frequenz­genauigkeit des Oszillators 4 im Uhrzeitgeber 3 des Anwendersystems 1 wird die Uhrzeitablage gegenüber der Referenzeinrichtung 2 zusammen mit den Daten, die den Zeitpunkt der vorausgegangenen Vergleichs oder der ersten Inbetriebnahme charakterisieren und im Aktuali­sierungszeitpunkt-Speicher 6 abgelegt sind, sowie mit den aktuellen Zeitdaten des Uhrzeitprozessors 11 im Uhrzeitgeber 10 der Referenzeinrichtung 2 einem Auswerter 14 zugeführt. Die im Aktualisierungszeit­punkt-Speicher 6 abgelegten Daten des vorausgegangenen Vergleichs bzw. der ersten Inbetriebnahme werden über einen Übertragungskanal 9d dem Auswerter 14 in der Referenzeinrichtung 2 eingegeben. Aus den dem Auswerter 14 zugeführten Zeitdaten läßt sich eine Information 15 über die mittlere Frequenzgenauigkeit für das betrach­tete Zeitintervall ermitteln.In a later comparison with the time record of the time processor 11 of the reference device 2, the time data of the user system to be tracked is checked with that of the reference device 2 in a comparator 13. The time of day data transmission from the time processor 5 of the user system 1 to the comparator 13 in the reference device 2 takes place via a transmission channel 9c. To determine the frequency accuracy of the oscillator 4 in the time generator 3 of the user system 1, the time storage is compared to the reference device 2 together with the data indicating the time of the previous comparison or characterize the first commissioning and are stored in the update time memory 6, and are fed to the evaluator 14 with the current time data of the time processor 11 in the time generator 10 of the reference device 2. The data of the previous comparison or of the first start-up stored in the update time memory 6 are input to the evaluator 14 in the reference device 2 via a transmission channel 9d. Information 15 about the mean frequency accuracy for the time interval under consideration can be determined from the time data supplied to the evaluator 14.

Die Information 15 über die Frequenzgenauigkeit des Oszillators 4 kann dazu herangezogen werden, die Zeit­intervalle zwischen den notwendigen Uhrzeitvergleichen hinsichtlich ihres Abstandes festzulegen.The information 15 about the frequency accuracy of the oscillator 4 can be used to determine the time intervals between the necessary time comparisons with regard to their distance.

Im Uhrzeitgeber 3 des dargestellten Anwendersystems wird ein Oszillator 4 mit einer Frequenznachstimmeinrichtung 7 verwendet, die dann betätigt wird, wenn die im Aus­werter 14 ermittelte mittlere Frequenzungenauigkeit des Oszillators 4 des Anwendersystem-Uhrzeitgebers 3 so groß wird, daß ein zu kurzer Zeitabstand zwischen aufeinander folgenden Uhrzeitvergleichen erforderlich würde. Ent­sprechend der ermittelten Ungenauigkeit wird der Oszil­lator 4 im Anwendersystem 1 über einen Referenzwertgeber 16 nachgestimmt. Der im Referenzwertgeber 16 jeweils vorliegende Referenzwert wird über einen Übertragungs­kanal 9a einem Referenzwertspeicher 8 im Anwendersystem 1 eingegeben, der dann mittels der Nachstimmeinrichtung 7 die Taktfrequenz des Oszillators 4 nachregelt.In the timer 3 of the user system shown, an oscillator 4 is used with a frequency re-tuning device 7, which is actuated when the mean frequency inaccuracy of the oscillator 4 of the user system timer 3 determined in the evaluator 14 becomes so great that a too short time interval between successive time comparisons would be required. In accordance with the determined inaccuracy, the oscillator 4 in the user system 1 is tuned using a reference value transmitter 16. The reference value present in the reference value transmitter 16 is input via a transmission channel 9a to a reference value memory 8 in the user system 1, which then adjusts the clock frequency of the oscillator 4 by means of the retuning device 7.

Für das Verfahren nach der Erfindung ist es nicht von Bedeutung, wie die durch einen Block 9 dargestellten Übertragungskanäle 9a bis 9d ausgeführt sind, ob z.B. der Vergleich durch einen physischen Kontakt oder über den Funkweg mit seriellem Datentransfer (Zeitmultiplex) erfolgt, da bei Abwicklung über den Funkweg das System entsprechende Einrichtungen und Verfahren für eine Laufzeitkorrektur aufweisen muß. Die Laufzeitkorrektur muß dabei derart ausgeführt sein, daß der Einsatz mobiler Anwendersysteme möglich ist.For the method according to the invention it is of no importance how the transmission channels 9a to 9d represented by a block 9 are implemented, eg the comparison is made through a physical contact or via the radio path with serial data transfer (time division multiplex), since the system must have the appropriate facilities and methods for a runtime correction when processing via the radio path. The runtime correction must be carried out in such a way that the use of mobile user systems is possible.

Claims (4)

1. Verfahren zum Aktualisieren der lokal mittels eines Uhrzeitgebers erzeugten Uhrzeit eines zeitgesteuert einen Eingangsparameter, insbesondere einen Schlüssel, ändernden Anwendersystems in einem mehrere solche Anwendersysteme aufweisenden, mit sich zeitlich änderndem Eingangsparameter (Schlüssel) arbeitenden Informationsübertragungssystem unter Verwendung eines Referenzuhrzeitgebers, der genauso wie der lokal beim Anwendersystem angeordnete Uhrzeitgeber aus einem Oszillator und einem Uhrzeitprozessor besteht,
dadurch gekennzeichnet, daß bei der Inbetriebnahme des Anwendersystems (1) der aktuelle Uhrzeitdatensatz vom Uhrzeitprozessor (11) des Referenzuhrzeitgebers (10) an den Uhrzeitprozessor (5) des zu aktualisierenden Anwendersystems (1) übergeben und unmittelbar danach beim Anwendersystem der Takt des Oszillators (4) zur Beaufschlagung des Uhrzeitprozessors (5) freigegeben und der Zeitpunkt der Übergabe des aktuellen Uhrzeitdatensatzes in einem Aktualisierungs­zeitpunkt-Speicher (6) abgelegt wird, daß nach beliebi­gen Zeitintervallen die Uhrzeitdaten des Uhrzeitprozes­sors (5) des zu aktualisierenden Anwendersystems (1) mit den Uhrzeitdaten des Uhrzeitprozessors (11) des Refe­renzuhzrzeitgebers (10) in einem Komparator (13) vergli­chen werden, daß die im Komparator (13) ermittelten Zeitablagedaten zusammen mit den Uhrzeitdaten, die den Zeitpunkt der Inbetriebnahme oder eines vorausgegangenen Vergleichs charakterisieren und im Aktualisierungszeit­punkt-Speicher (6) des Anwendersystems (1) abgelegt sind, sowie mit den aktuellen Uhrzeitdaten des Uhrzeit­prozessors (11) des Referenzuhrzeitgebers (10) einem Auswerter (14) zugeführt werden, in dem aus diesen Daten die mittlere Frequenzgenauigkeit des Oszillators (4) im Uhrzeitgeber (3) des jeweiligen Anwendersystems (1) ermittelt wird.1.Method for updating the time of a time-controlled input parameter, in particular a key, of a user system which is generated locally by means of a time transmitter, in an information transmission system which has a number of such user systems and operates with a time-changing input parameter (key), using a reference clock, which is the same as the local one clocks arranged in the user system consist of an oscillator and a time processor,
characterized in that when the user system (1) is started up, the current time data record is transferred from the time processor (11) of the reference clock timer (10) to the time processor (5) of the user system (1) to be updated, and immediately afterwards the clock of the oscillator (4 ) for loading the time processor (5) and the time of transfer of the current time data record is stored in an update time memory (6) that after any time intervals the time data of the time processor (5) of the user system to be updated (1) with the time data of the Time processor (11) of the reference clock (10) can be compared in a comparator (13), that the time storage data determined in the comparator (13) together with the time data that characterize the time of commissioning or a previous comparison and in the update time memory (6) of the user system (1) gt, and with the current time data of the time processor (11) of the reference clock timer (10) are fed to an evaluator (14) in which the mean frequency accuracy of the oscillator (4) in the clock generator (3) of the respective user system (1) is derived from this data. is determined. 2. Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß die im Auswerter (14) ermittelte mittlere Frequenzge­nauigkeit des Oszillators (4) des Anwendersystem-Uhr­zeitgebers (3) zur Festlegung der Zeitintervalle zwischen den der Aktualisierung dienenden Uhrzeitver­gleichen herangezogen wird, derart, daß bei geringen Frequenzabweichungen das Zeitintervall zwischen aufein­anderfolgenden Uhrzeitvergleichen groß und bei größeren Frequenzabweichungen dieses Zeitintervall kleiner gemacht wird.2. The method according to claim 1,
characterized in that the mean frequency accuracy of the oscillator (4) of the user system clock (3) determined in the evaluator (14) is used to determine the time intervals between the time comparisons used for updating, such that the time interval between successive time comparisons is large with small frequency deviations and in the case of larger frequency deviations, this time interval is made smaller. 3. Verfahren nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß im Uhrzeitgeber (3) des Anwendersystems (1) ein Oszilla­tor (4) mit einer Frequenznachstimmeinrichtung (7) verwendet wird, die dann betätigt wird, wenn die im Auswerter (14) ermittelte mittlere Frequenzungenauigkeit des Oszillators (4) des Anwendersystem-Uhrzeitgebers (3) so groß wird, daß ein sehr kurzes Zeitintervall zwischen aufeinanderfolgenden Uhrzeitvergleichen erforderlich würde.3. The method according to claim 1 or 2,
characterized in that an oscillator (4) with a frequency re-tuning device (7) is used in the time generator (3) of the user system (1), which is actuated when the mean frequency inaccuracy of the oscillator (4) of the user system determined in the evaluator (14) -The clock (3) becomes so large that a very short time interval between successive time comparisons would be required. 4. Verfahren nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß insbesondere bei mobilen Anwendersystemen (1) mittels einer Korrektureinrichtung eine Laufzeitkorrektur der aktualisierten Uhrzeit dann vorgenommen wird, wenn die Uhrzeitvergleichsabwicklung über den Funkweg stattfin­det.4. The method according to any one of the preceding claims,
characterized in that, in particular in the case of mobile user systems (1), a runtime correction of the updated time is carried out by means of a correction device when the time comparison processing takes place via the radio path.
EP19870112555 1986-09-01 1987-08-28 Process for actualizing the local time of a user of an information tranfer system Withdrawn EP0258838A3 (en)

Applications Claiming Priority (2)

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DE3629600 1986-09-01
DE3629600 1986-09-01

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EP0258838A2 true EP0258838A2 (en) 1988-03-09
EP0258838A3 EP0258838A3 (en) 1991-01-23

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2261752A (en) * 1991-11-19 1993-05-26 Seikosha Kk Timepiece with synchronising means
EP0590337A1 (en) * 1992-10-02 1994-04-06 TEMIC TELEFUNKEN microelectronic GmbH Method for the functioning pf a radio clock and radio clock to be used in an envirenment with disturbed field
DE4423366C1 (en) * 1994-07-04 1995-10-19 Grundig Emv Software clock operating method for electronic entertainment appts. e.g with TV receiver or video recorder
EP0703514A1 (en) 1994-09-24 1996-03-27 Eta SA Fabriques d'Ebauches Time measurement in a communications system, a communications system and a receiver for use in such a system
WO2000023854A1 (en) * 1998-10-16 2000-04-27 Robert Bosch Gmbh Clock comprising a microprocessor
EP1028535A1 (en) * 1998-06-09 2000-08-16 Matsushita Electric Industrial Co., Ltd. Broadcasting receiver
EP1122622A1 (en) * 2000-02-01 2001-08-08 Matsushita Electric Industrial Co., Ltd. Electronic device and method for adjusting an internal clock
US20110035613A1 (en) * 2008-04-11 2011-02-10 Freescale Semiconductor, Inc. Microprocessor having a low-power mode and a non-low power mode, data processing system and computer program product

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US3026481A (en) * 1957-09-30 1962-03-20 Ibm Synchronized time system
US3808365A (en) * 1970-12-08 1974-04-30 Gretag Ag Method and apparatus for encoding and decoding messages
US4142069A (en) * 1977-06-20 1979-02-27 The United States Of America As Represented By The Secretary Of The Army Time reference distribution technique
US4337463A (en) * 1980-08-22 1982-06-29 Control Data Corporation Time synchronization master station and remote station system
JPS60236088A (en) * 1984-05-09 1985-11-22 Hitachi Ltd Synchronizing system of network

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US3026481A (en) * 1957-09-30 1962-03-20 Ibm Synchronized time system
US3808365A (en) * 1970-12-08 1974-04-30 Gretag Ag Method and apparatus for encoding and decoding messages
US4142069A (en) * 1977-06-20 1979-02-27 The United States Of America As Represented By The Secretary Of The Army Time reference distribution technique
US4337463A (en) * 1980-08-22 1982-06-29 Control Data Corporation Time synchronization master station and remote station system
JPS60236088A (en) * 1984-05-09 1985-11-22 Hitachi Ltd Synchronizing system of network

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Title
PATENT ABSTRACTS OF JAPAN, Band 10, Nr. 102 (P-448)[2159], 18. April 1986; & JP-A-60 236 088 (HITACHI) 22-11-1985 *

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2261752A (en) * 1991-11-19 1993-05-26 Seikosha Kk Timepiece with synchronising means
GB2261752B (en) * 1991-11-19 1995-02-01 Seikosha Kk Timepiece
US5528560A (en) * 1991-11-19 1996-06-18 Seikosha Co., Ltd. Timepiece receptive of a broadcast time-signal for correcting a time error
EP0590337A1 (en) * 1992-10-02 1994-04-06 TEMIC TELEFUNKEN microelectronic GmbH Method for the functioning pf a radio clock and radio clock to be used in an envirenment with disturbed field
DE4423366C1 (en) * 1994-07-04 1995-10-19 Grundig Emv Software clock operating method for electronic entertainment appts. e.g with TV receiver or video recorder
EP0703514A1 (en) 1994-09-24 1996-03-27 Eta SA Fabriques d'Ebauches Time measurement in a communications system, a communications system and a receiver for use in such a system
EP1028535A4 (en) * 1998-06-09 2002-11-20 Matsushita Electric Ind Co Ltd Broadcasting receiver
EP1028535A1 (en) * 1998-06-09 2000-08-16 Matsushita Electric Industrial Co., Ltd. Broadcasting receiver
US6552752B1 (en) 1998-06-09 2003-04-22 Matsushita Electric Industrial Co., Ltd. Clock generating based on a reference signal included in the digital input data of a digital broadcasting receiver
WO2000023854A1 (en) * 1998-10-16 2000-04-27 Robert Bosch Gmbh Clock comprising a microprocessor
EP1122622A1 (en) * 2000-02-01 2001-08-08 Matsushita Electric Industrial Co., Ltd. Electronic device and method for adjusting an internal clock
US20110035613A1 (en) * 2008-04-11 2011-02-10 Freescale Semiconductor, Inc. Microprocessor having a low-power mode and a non-low power mode, data processing system and computer program product
US8756446B2 (en) * 2008-04-11 2014-06-17 Freescale Semiconductor, Inc. Microprocessor having a low-power mode and a non-low power mode, data processing system and computer program product

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