EP1183573A1 - Method and device for synchronisation of distant clocks to a central clock via satellite - Google Patents

Method and device for synchronisation of distant clocks to a central clock via satellite

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Publication number
EP1183573A1
EP1183573A1 EP00915192A EP00915192A EP1183573A1 EP 1183573 A1 EP1183573 A1 EP 1183573A1 EP 00915192 A EP00915192 A EP 00915192A EP 00915192 A EP00915192 A EP 00915192A EP 1183573 A1 EP1183573 A1 EP 1183573A1
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EP
European Patent Office
Prior art keywords
clock
remote
time
central
satellite
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EP00915192A
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German (de)
French (fr)
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EP1183573B1 (en
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Wolfgang Schäfer
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Individual
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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
    • G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS

Definitions

  • satellite-based time signals In addition to terrestrially transmitted time signals, eg DCF-77, satellite-based time signals have been transmitted more and more recently.
  • the best known methods are the GPS and GLONASS system
  • a serious disadvantage is the need for high-precision satellite positioning, as well as the exact knowledge of the transmission path, in particular the ionosphere and troposhare, which is inevitable for a user with the highest accuracy.
  • the satellite signals for civil users are deliberately falsified ('selective availability') In order to prevent non-military use with the greatest accuracy.
  • Methods have been developed which partially compensate for these uncertainties (eg differential GPS). The difficulties in using the GPS signal for highly precise time applications have so far not been satisfactorily resolved
  • the two-way method (TWSTFT, two-way satellite time and frequency transfer) for time transmission is particularly suitable for metrological purposes. It is a method used by national calibration authorities (e.g. PTB Braunschweig) to compare existing time quays based on atomic clocks
  • national calibration authorities e.g. PTB Braunschweig
  • the advantage of this method lies in the principle-dependent independence from the satellite position and from windows through the transmission path. It can be derived directly from the symmetry of the method. Since both partners of a connection require both a transmitting and a receiving device, the application of the method remained mainly because the relatively high effort is limited to a few national authorities (D, UK F, OE, USA YES, IT ES, NL)
  • the remote clock is synchronized via a control loop to the central clock by applying the system-related corrections that are also exchanged between the stations 4
  • the time and frequency information available at the distant clock is available to the user in the form of externally accessible electrical signals
  • the qualttat of the clock installed in the remote station can be significantly lower and cheaper compared to atomic clocks, since this clock is adjusted to the central clock by a constant control loop
  • the method is suitable for reliably preventing long-term errors (drift) of the system in particular, which, in principle, even commercial atomic clocks of the highest quality are unable to,
  • Time signals that can be used are available to the user
  • the method has calibration quality due to its direct relation to a recognized time scale
  • the measuring method is directly accessible to a Ka bration
  • the object of the invention is therefore a method and a device for synchronizing remote clocks via satellite to a central clock
  • FIG. 1 shows an example of a simple combination consisting of a central clock (1) on a satellite ground station (5) and a remote clock (2) in a further satellite ground station (11), with a suitable measuring apparatus consisting of a transmitting (7) and receiving unit (8) at the central station and the corresponding transmitting (12) and receiving unit (13) at the remote station, a control signal (17) is obtained so that the remote clock
  • both stations are connected to a bi-directional radio link (9 1) and (9 2) via a satellite (10) and exchange them in real time Results (15, 16) from time difference measurements (6, 14) in both stations directly via the radio link (9 1, 9 2), via which the time signals of the stations are also exchanged.
  • the control variable (17) is calculated from the difference between the two time difference measurements formed in the distant ground station. It influences the frequency of the distant clock (2) the reference time

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Electric Clocks (AREA)
  • Radio Relay Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

The invention relates to a method and device for synchronisation of one or more distant clocks (2) to a central clock (1) by means of a bi-directional satellite radio frequency link (9.1, 9.2). Suitable radio signal transmitters (8, 12) and receivers (5, 1) at both sides of the link exchange timing and data signals. From the time-difference measurements (6, 14) performed at both sides, a control signal is derived to adjust the distant clock, which is directly built into the remote ground station equipment (11), to be in synchronism with respect to time and frequency to the central clock by means of the Two-Way Satellite Time and Frequency Transfer (TWSTFT) method. The user has access to timing signals (18) which directly represent the time of the central clock (1). For data transmission, the same signals are used which are already used for the timing measurements. Hence, a system operating in real-time is established which makes available the information about the control-loop error (15, 16) at both sides of the system.

Description

Verfahren zur Synchronisation von entfernten Uhren über Satellit an eine zentrale UhrProcedure for synchronizing remote clocks via satellite to a central clock
Beschreibungdescription
Zusätzlich zu terrestrisch ausgesandten Zeitzeichen, z B DCF-77, werden in letzter Zeit vermehrt satellitengestutzte Zeitsignale ausgesandt Die bekanntesten Verfahren sind das GPS- und GLONASS SystemIn addition to terrestrially transmitted time signals, eg DCF-77, satellite-based time signals have been transmitted more and more recently. The best known methods are the GPS and GLONASS system
Als gravierender Nachteil ist die Notwendigkeit einer hochgenauen Satelliten- Positionierung, sowie der exakten Kenntnis des Ubertragungsweges, insbesondere der Ionosphäre und Troposhare, zu sehen, die für einen Nutzer höchster Genauigkeit unumgänglich ist Zudem werden die Satellitensignale für zivile Nutzer bewußt verfälscht ('Selective Availability ), um eine nichtmilitarische Nutzung mit höchster Genauigkeit zu verhindern Es wurden Verfahren entwickelt, die eine teilweise Kompensation dieser Unsicherheiten erlauben (z B Differential GPS) Die Schwierigkeiten zur Nutzung des GPS Signales für hochprazise Zeit-Anwendungen sind bis heute nicht zufriedenstellend gelostA serious disadvantage is the need for high-precision satellite positioning, as well as the exact knowledge of the transmission path, in particular the ionosphere and troposhare, which is inevitable for a user with the highest accuracy. In addition, the satellite signals for civil users are deliberately falsified ('selective availability') In order to prevent non-military use with the greatest accuracy. Methods have been developed which partially compensate for these uncertainties (eg differential GPS). The difficulties in using the GPS signal for highly precise time applications have so far not been satisfactorily resolved
Die genannten Verfahren sind wegen der kostengünstigen Verfügbarkeit geeigneter Empfangseinrichtungen weitverbreitet Ein operationeller Nachteil wird gerade in der militärischen Natur der Systeme gesehen, die eine Nutzung unter industrieller Verantwortung behindern Satellitengestutzte Zeitsignale erfordern eine umfangreiche Infrastruktur zur Überwachung und Verifizierung Als weiterer Nachteil ist zu sehen, daß hochprazise Daten aus den genannten Systemen nur mit Zeitverzogerungen von Stunden oder langer zur Verfugung stehenThe methods mentioned are widespread because of the inexpensive availability of suitable receiving devices. An operational disadvantage is seen particularly in the military nature of the systems which hinder use under industrial responsibility. Satellite-based time signals require an extensive infrastructure for monitoring and verification. Another disadvantage is that highly precise Data from the systems mentioned are only available with time delays of hours or longer
Für metrologische Zwecke besonders geeignet ist das Zwei-Weg Verfahren (TWSTFT, Two Way Satellite Time- and Frequency Transfer) zur Zeitubertragung Es ist ein von nationalen Eichbehorden (z B PTB Braunschweig) verwendetes Verfahren zum Vergleich existierender, auf Atomuhren basierender, Zeitskaien Der Vorteil dieses Verfahrens liegt in der prinzipiell bedingten Unabhängigkeit von der Satellitenposition und von Fenlern durch den Ubertragungsweg Er kann direkt aus der Symmetrie des Verfahrens abgeleitet werden Da beide Partner einer Verbindung sowohl eine Sende- als auch Empfangseinrichtung benotigen, blieb die Anwendung des Verfahrens insbesondere wegen des relativ hohen Aufwandes auf wenige nationale Behörden beschrankt (D, UK F, OE, USA JA, IT ES, NL)The two-way method (TWSTFT, two-way satellite time and frequency transfer) for time transmission is particularly suitable for metrological purposes. It is a method used by national calibration authorities (e.g. PTB Braunschweig) to compare existing time quays based on atomic clocks The advantage of this method lies in the principle-dependent independence from the satellite position and from windows through the transmission path. It can be derived directly from the symmetry of the method. Since both partners of a connection require both a transmitting and a receiving device, the application of the method remained mainly because the relatively high effort is limited to a few national authorities (D, UK F, OE, USA YES, IT ES, NL)
Die zunehmende Verfügbarkeit kleiner, kostengünstiger Satelliten- Bodenstationen mit Sendeeinrichtung laßt die systembedingten Nachteile heute immer mehr in den Hintergrund rucken Es liegt nahe, das seit Jahren erprobte 2-Weg Verfahren als Alternative zu Einwegeverfahren (GPS, GLONASS) einer breiten Nutzung zugänglich zu machenThe increasing availability of small, low-cost satellite ground stations with a transmitter means that the system-related disadvantages are becoming less and less important today. It makes sense to make the 2-way method, which has been tried and tested for years, an alternative to one-way methods (GPS, GLONASS) and make it widely available
Bisher stand dem im Wege daß das 2-Wege Verfahren, auch TWSTFT (Two- Way Satellite Time and Frequency Transfer) genannt, sich auf den Vergleich bestehender, extern zu den hier beschriebenen Geraten befindlicher Uhren, beschrankte und daß die Meßergebnisse erst mit einer Zeitverzogerung von bis zu mehreren Tagen nach entsprechenden Berechnungen vom BIPM (Bureau International des Poids et Mesures, Paris) veröffentlicht werdenSo far, this has stood in the way of the fact that the 2-way method, also called TWSTFT (Two-Way Satellite Time and Frequency Transfer), was limited to the comparison of existing clocks external to the devices described here, and that the measurement results only with a time delay up to several days after corresponding calculations by the BIPM (Bureau International des Poids et Mesures, Paris)
Diese Nachteile behebt das Verfahren durch fünf wesentliche NeuerungenThe process overcomes these disadvantages with five major innovations
1 In der Entfernten Station befindet sich eine physikalische Uhr mit zusätzlicher Gangreserve Es ist also nicht wie bisher beim 2-Weg Zeit-Transfer eine hochgenaue externe Uhr erforderlich, sondern es wird die direkt im Gerat eingebaute Uhr verwendet1 There is a physical clock in the remote station with an additional power reserve. A high-precision external clock is therefore not required, as was previously the case with 2-way time transfer, but the clock installed directly in the device is used
2 Die der Zeitubertragung dienenden Signale werden gleichzeitig für den bidirektionalen Austausch der 2-Weg Meßdaten genutzt2 The signals used for time transmission are used simultaneously for the bidirectional exchange of the 2-way measurement data
3 Aufgrund der standig erneuerten Meßdaten synchronisiert sich die Entfernte Uhr über einen Regelkreis auf die Zentrale Uhr unter Anbringung der sytembeαingten Korrekturen die ebenfalls zwischen den Stationen ausgetauscht werden 4 Die an der Entfernten Uhr vorhandene Zeit- und Frequenzinformation steht in Form extern zugänglicher elektrischer Signale dem Nutzer zur Verfugung3 Due to the constantly renewed measurement data, the remote clock is synchronized via a control loop to the central clock by applying the system-related corrections that are also exchanged between the stations 4 The time and frequency information available at the distant clock is available to the user in the form of externally accessible electrical signals
5 Die Qualität der Synchronisation ist aufgrund der standigen Aufdatierung der Meßdaten mit minimalem Zeitverzug überprüfbar5 The quality of the synchronization can be checked with minimal delay due to the constant updating of the measurement data
Für den Nutzer ergeben sich aus dem Verfahren folgende VorteileThe following advantages result for the user from the method
1 Unabhängigkeit von Infrastrukturen mit militärischem- und/oder multinationalem Charakter.1 Independence from infrastructures with a military and / or multinational character.
2 Es besitzt keinerlei aus militärischen Gründen bewußt eingeführte Verschlechterung der Datenqualitat ('Selective Availability')2 It has no deliberate deterioration in data quality for military reasons ('Selective Availability')
3 Das System gewährleistet unter Ausnutzung des eingeführten Meßverfahrens nach dem3 The system guarantees, taking advantage of the measuring procedure introduced after the
2-Wegeprιnzιp eine hohe Unabhängigkeit von der Satellitenposition. Es arbeitet ohne Kenntnis der Ausbreitungszeit längs des Ubertragungsweges2-way principle a high degree of independence from the satellite position. It works without knowing the propagation time along the transmission path
Die Qualltat der in der Entfernten Station eingebauten Uhr kann im Vergleich zu Atom-Uhren deutlich geringer und kostengünstiger sein, da diese Uhr durch einen standigen Regelkreis an die Zentrale Uhr angeglichen wirdThe qualttat of the clock installed in the remote station can be significantly lower and cheaper compared to atomic clocks, since this clock is adjusted to the central clock by a constant control loop
Das Verfahren ist geeignet, gerade auch Langzeitfehler (Drift) des Systemes so zuverlässig zu verhindern, wie es im praktischen Betrieb selbst kommerzielle Atomuhren höchster Qualität aus prinzipiellen Gründen nicht vermögen,The method is suitable for reliably preventing long-term errors (drift) of the system in particular, which, in principle, even commercial atomic clocks of the highest quality are unable to,
Das Verfahren arbeitet in Echt-Zeit ohne aufwendige Nachprozessierung der DatenThe process works in real time without time-consuming post-processing of the data
Dem Nutzer stehen direkt verwendbare Zeitsignale zur VerfugungTime signals that can be used are available to the user
Das Verfahren besitzt durch direkte Relation zu einer anerkannten Zeitskala Eich-QualitatThe method has calibration quality due to its direct relation to a recognized time scale
Das Meßverfahren ist einer Ka bration direkt zugänglich Aufgabe der Erfindung ist daher ein Verfahren und eine Vorrichtung zur Synchronisation von Entfernten Uhren über Satellit an eine Zentrale UhrThe measuring method is directly accessible to a Ka bration The object of the invention is therefore a method and a device for synchronizing remote clocks via satellite to a central clock
Diese Aufgabe wird mit einer Vorrichtung des Anspruchs 1a und durch eine Verfahren mit den Merkmalen der Ansprüche 1 b) bis 1 i)This object is achieved with a device of claim 1a and by a method with the features of claims 1 b) to 1 i)
Die Eπndung wird mit Bezug auf Figur 1 naher beschrieben Figur 1 zeigt am Beispiel einer einfachen Kombination bestehend aus aus einer Zentralen Uhr (1 ) an einer Satellitenbodenstation (5) und einer Entfernten Uhr (2) in einer weiteren Satellitenbodenstation (11 ), wobei mit einer geeigneten Meassapparatur bestehend aus einer Sende- (7) und Empfangseinheit (8) an der Zentralen Station sowie den Entspecehnden Sende- (12) und Empfangseinheit (13) an der entfernten Station ein Regelsignal (17) so gewonnen wird, dass die Entfernte UhrThe ending is described in more detail with reference to FIG. 1. FIG. 1 shows an example of a simple combination consisting of a central clock (1) on a satellite ground station (5) and a remote clock (2) in a further satellite ground station (11), with a suitable measuring apparatus consisting of a transmitting (7) and receiving unit (8) at the central station and the corresponding transmitting (12) and receiving unit (13) at the remote station, a control signal (17) is obtained so that the remote clock
(2) nach Stand und Gang mit der Zentralen Uhr (1 ) synchron ist Zu diesem Zweck stehen beide Stationen mit eine bi-direktionale Funkstrecke (9 1 ) und (9 2) über einen Satelliten (10) in Verbindung und tauschen in Echtzeit die Ergebnisse (15, 16) aus Zeitdifferenzmessungen (6, 14) in beiden Stationen direkt über die Funkstrecke (9 1 , 9 2) aus, über die auch die Zeitsignale der Stationen ausgetauscht werden Die Stellgrosse des Regelkreises (17) wird aus der Differenz der beiden Zeitdifferenzmessungen in der Entfernten Bodenstation gebildet Sie beeinflusst die Frequenz der Entfernten Uhr (2) Die Referenzzeit(2) synchronized according to position and aisle with the central clock (1) For this purpose both stations are connected to a bi-directional radio link (9 1) and (9 2) via a satellite (10) and exchange them in real time Results (15, 16) from time difference measurements (6, 14) in both stations directly via the radio link (9 1, 9 2), via which the time signals of the stations are also exchanged. The control variable (17) is calculated from the difference between the two time difference measurements formed in the distant ground station. It influences the frequency of the distant clock (2) the reference time
(3) der Zentralen Uhr wird dem Nutzer an der Entfernten Uhr in Form von Zeitsignalen (18) zur Verfugung gestellt(3) the central clock is made available to the user on the remote clock in the form of time signals (18)
Die Symmetrie des Gesamt-Aufbaues und der Funkstrecke sind maßgeblich für die Eliminierung der unbekannten Zeitverzogerungen des Ubertragungsweges und durch den Satelliten The symmetry of the overall structure and the radio link are decisive for the elimination of the unknown time delays of the transmission path and by the satellite

Claims

Patentansprücheclaims
1 Verfahren zur Synchronisation von Entfernten Uhren über Satellit an eine Zentrale Uhr1 Procedure for the synchronization of remote clocks via satellite to a central clock
dadurch gekennzeichnet,characterized,
a) daß sich die Entfernte Uhr physikalisch als integraler Bestandteil in einer Satelliten-Bodenstation befindeta) that the distant clock is physically an integral part of a satellite ground station
b) daß die Zentrale Uhr an einer Zentralen Bodenstation mit einer oder mehreren Entfernten Uhren über bi-direktionale Satelliten-Kommunikations- verbindungen genannt Zwei-Weg-Verbindungen entweder ununterbrochen oder intermittierend in Verbindung stehtb) that the central clock at a central ground station is connected to one or more remote clocks via bi-directional satellite communication connections called two-way connections either continuously or intermittently
c) daß beide Seiten der Kommunikationsverbindung sowohl mit einer Sende- als auch mit einer Empfangseinrichtung für Satellitensignale ausgerüstet sind,c) that both sides of the communication link are equipped with both a transmitting and a receiving device for satellite signals,
d) daß sowohl die Zentrale Uhr als auch die Entfernte Uhr jeweils die Zeitdifferenz zwischen dem Empfangszeitpunkt des von der Gegenstation gesandten Signaies gegenüber der lokalen Uhr bestimmen Diese Differenzen werden 'Meßdaten genanntd) that both the central clock and the remote clock each determine the time difference between the time of reception of the signal sent by the opposite station compared to the local clock. These differences are called 'measurement data'
e) daß Zentrale und Entfernte Uhr diese beidseitig gewonnenen 'Meßdaten' zusammen mit systembedingten Korrekturdaten intermittierend austauschene) that the central and remote clocks intermittently exchange these 'measurement data' obtained on both sides together with system-related correction data
f) daß die Entfernte Uhr aufgrund der 'Meßdaten nach Stand und Gang auf die Zentrale Uhr über einen Regelkreis synchronisiert wirdf) that the remote clock is synchronized on the basis of the measurement data according to position and gear to the central clock via a control loop
g) daß für den Datenaustausch außer den die Zeitinformation tragenden Satellitensignale keine zusätzlichen Datenkanale verwendet werden müsseng) that no additional data channels need to be used for the data exchange other than the satellite signals carrying the time information
h) daß die so in der Bodenstation entstandene Zeit- und Frequenzinformation dem Nutzer pnysika sch in der Form geeigneter puls- und/oder sinusförmiger Signale genannt Zeitsignale' einschließlich etwaiger digitaler Korrekturwerte zur Verfugung stehen Weitere Kennzeichnungenh) that the time and frequency information thus created in the ground station are available to the user pnysika sch in the form of suitable pulse and / or sinusoidal signals called time signals, including any digital correction values Other markings
2 Entfernte synchronisierte Uhr dadurch gekennzeichnet2 Remote synchronized clock marked
a) daß sie eine eingebaute Gangreserve hat die es erlaubt Kommunikationsunterbrechungen bei reduzierter Genauigkeit zu überbrückena) that it has a built-in power reserve that allows communication breaks to be bridged with reduced accuracy
b) daß zur Genauigkeitssteigerung der in den Zeitsignalen befindlichen Informationen dem Nutzer zusatzliche digitale Korrekturdaten zur Verfugung stehen könnenb) that additional digital correction data may be available to the user to increase the accuracy of the information contained in the time signals
c) daß die eindeutige Zeit- und Datumsangabe an einem Datenausgang zur Verfugung stehtc) that the clear time and date information is available at a data output
d) daß das Gesamtsystem dadurch gekennzeichnet ist, daß es keinerlei besondere Einrichtungen an Bord des Satelliten benotigt, diese allerding auch nicht ausschließtd) that the overall system is characterized in that it does not require any special facilities on board the satellite, but does not exclude them
e) Das Gesamtsystem ohne Information über die aktuelle Satellitenposition arbeitete) The entire system works without information about the current satellite position
f) Es sich um ein Echt-Zeit Verfahren mit standiger aktueller Verfügbarkeit der Datums- Zeit- und Frequenzinformation handeltf) It is a real-time method with constant current availability of the date, time and frequency information
Weitere AnsprücheFurther claims
3 Verfahren nach einem der vorhergehenden Anpruche, dadurch gekennzeichnet daß die Entfernte Bodenstation über ein Frequenzmultiplexverfahren (FDMA) mit der Zentralen Uhr in Verbindung steht3 Method according to one of the preceding claims, characterized in that the remote ground station is connected to the central clock via a frequency division multiplex method (FDMA)
4 Verfahren nach einem der vorhergehenden Anpruche dadurch gekennzeichnet daß die Entfernte Bodenstation über ein Codemultiplexverfahren (CDMA) mit der Zentralen Uhr in Verbindung steht Verfahren nach einem der vorhergehenden Anpruche dadurch gekennzeichnet daß die Entfernte Bodenstation über ein Zeitmultiplexverfahren (TDMA) mit der Zentralen Uhr in Verbindung steht4 Method according to one of the preceding claims, characterized in that the remote ground station is connected to the central clock via a code division multiplex method (CDMA) Method according to one of the preceding claims, characterized in that the remote ground station is connected to the central clock via a time division multiplex method (TDMA)
Verfahren nach einem der vorhergehenden Anpruche, dadurch gekennzeichnet, daß die Entfernte Bodenstation über einen oder mehrere Satelliten mit der Zentralen Uhr in Verbindung stehtMethod according to one of the preceding claims, characterized in that the remote ground station is connected to the central clock via one or more satellites
Verfahren nach einem der vorhergehenden Anpruche dadurch gekennzeichnet, daß die Entfernte Bodenstation mit einem System aus redundanten Zentralen Uhren über ein Multiplexverfahren Verbindung stehtMethod according to one of the preceding claims, characterized in that the remote ground station is connected to a system of redundant central clocks via a multiplex method
Verfahren nach einem der vorhergehenden Anpruche, dadurch gekennzeichnet, daß eine beliebige Anzahl von Entfernten Bodenstation über ein Multiplexverfahren mit der Zentralen Uhr in Verbindung stehtMethod according to one of the preceding claims, characterized in that any number of remote ground stations is connected to the central clock via a multiplex method
Verfahren nach einem der vorhergehenden Anpruche, dadurch gekennzeichnet, daß eine beliebige Anzahl von Entfernten Bodenstation über ein Multiplexverfahren mit einem redundanten System von Zentralen Uhren in Verbindung stehtMethod according to one of the preceding claims, characterized in that any number of remote ground stations is connected to a redundant system of central clocks via a multiplex method
Verfahren nach einem der vorhergehenden Anpruche dadurch gekennzeichnet, daß die sich an Bord des Satelliten ein transparenter Transponder befindetMethod according to one of the preceding claims, characterized in that there is a transparent transponder on board the satellite
Verfahren nach einem der vorhergehenden Anpruche dadurch gekennzeichnet daß die sich an Bord des Satelliten ein regenerativer Transponder befindetMethod according to one of the preceding claims, characterized in that there is a regenerative transponder on board the satellite
Verfahren nach einem der vorhergehenden Anpruche dadurch gekennzeichnet daß dem Nutzer in digitaler Form der aktuelle Stand der Entfernten Uhr bezüglich der Zentralen Uhr mitgeteilt wirdMethod according to one of the preceding claims, characterized in that the user is informed in digital form of the current status of the remote clock with respect to the central clock
Verfanren nach einem der vorhergehenden AnDruche dadurch gekennzeichnet daß dem Nutzer ein Warnsignal zugeleitet wird falls die Abweichung der Entfernten Uhr bezüglich der Zentralen Uhr einen Grenzwert • überschreitet.Method according to one of the preceding claims, characterized in that a warning signal is sent to the user if the deviation the Remote pm • a limit exceeds with respect to the central clock.
14. Verfahren nach einem der vorhergehenden Anpruche, dadurch gekennzeichnet, daß an der Zentralen Uhr der jeweilig Stand der Entfernten Uhren in Form von Telemetriedaten verfügbar ist. 14. The method according to any one of the preceding claims, characterized in that the respective status of the remote clocks is available in the form of telemetry data at the central clock.
EP00915192.9A 1999-03-30 2000-03-30 Method and device for synchronisation of distant clocks to a central clock via satellite Expired - Lifetime EP1183573B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19914355 1999-03-30
DE19914355A DE19914355A1 (en) 1999-03-30 1999-03-30 Method for synchronizing remote clocks with central clock via satellite
PCT/EP2000/002838 WO2000060420A1 (en) 1999-03-30 2000-03-30 Method and device for synchronisation of distant clocks to a central clock via satellite

Publications (2)

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EP1183573A1 true EP1183573A1 (en) 2002-03-06
EP1183573B1 EP1183573B1 (en) 2016-09-14

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US (1) US7327699B1 (en)
EP (1) EP1183573B1 (en)
AU (1) AU3658800A (en)
CY (1) CY1118285T1 (en)
DE (1) DE19914355A1 (en)
DK (1) DK1183573T3 (en)
ES (1) ES2606366T3 (en)
PT (1) PT1183573T (en)
WO (1) WO2000060420A1 (en)

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US7327699B1 (en) 2008-02-05
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