EP1449006A1 - Procede pour transmettre des messages concernant des etats aux terminaux d'un systeme de transmission de donnees par satellite, notamment d'un systeme de navigation par satellite - Google Patents

Procede pour transmettre des messages concernant des etats aux terminaux d'un systeme de transmission de donnees par satellite, notamment d'un systeme de navigation par satellite

Info

Publication number
EP1449006A1
EP1449006A1 EP02790334A EP02790334A EP1449006A1 EP 1449006 A1 EP1449006 A1 EP 1449006A1 EP 02790334 A EP02790334 A EP 02790334A EP 02790334 A EP02790334 A EP 02790334A EP 1449006 A1 EP1449006 A1 EP 1449006A1
Authority
EP
European Patent Office
Prior art keywords
data
satellite
integrity
data blocks
nav2
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02790334A
Other languages
German (de)
English (en)
Inventor
Hans Trautenberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airbus DS GmbH
Original Assignee
EADS Astrium GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE10157619A external-priority patent/DE10157619C2/de
Application filed by EADS Astrium GmbH filed Critical EADS Astrium GmbH
Publication of EP1449006A1 publication Critical patent/EP1449006A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/03—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers
    • G01S19/08—Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing integrity information, e.g. health of satellites or quality of ephemeris data

Definitions

  • the present invention relates to a method for transmitting status messages to subscriber terminals of a satellite data transmission system, which is designed for the data transmission of user data blocks from satellites to the subscriber terminals.
  • satellite data transmission systems can transmit a wide variety of useful data, such as communication data or multimedia data, but also navigation data, as is known, for example, from US Pat. No. 6,205,377.
  • the present invention is basically applicable to all types of such satellite data transmission systems.
  • GALILEO Satellite System Design and Technology Developments
  • European Space Agency November 2000, available for example at http://ravel.esrin.esa.it/docs/galileo_world_paper_Dec_2000.pdf.
  • Such status messages can either hinder the transmission of the user data to the subscriber terminals or the evaluation of the user data or the user data signals in the subscriber terminals if the transmission of the status messages takes place at a high data rate.
  • the status messages are transmitted at a low data rate, the status messages in the subscriber terminals can only be updated slowly or inadequately.
  • the object of the present invention is to provide a possibility for the transmission of status messages in the context of a satellite data transmission system which is designed for the data transmission of user data blocks, which interferes as little as possible with the user data transmission and nevertheless allows a quick update of status information. This object is achieved by the features of claim 1.
  • a method for the transmission of status messages to subscriber terminals of a satellite data transmission system which is designed for the data transmission of user data blocks from satellites to the subscriber terminals.
  • the status messages are first broken down into data blocks that are smaller than the data blocks of the user data. At least one data block of the status messages is then inserted into successive data blocks of the user data. Several status message data blocks can also be inserted into one user data block. The data of the status message is thus integrated into the data scope of the data blocks of the user data. Depending on the scope of the status messages, the data blocks of the status messages are distributed over a sufficiently large number of user data blocks.
  • These status message data blocks can be inserted into the user data blocks in a regular sequence, regularly transmitted together with the user data to the subscriber terminals and also regularly updated accordingly.
  • the status message data blocks make up a maximum of 25% of the total data content of a user data block.
  • a minimum data rate which is at least to be maintained, is predefined by a system-defined or a terminal or user-defined time specification for the transmission of the complete status messages.
  • a change message is inserted into subsequent data blocks of the user data instead of one or more data blocks of the status messages.
  • the insertion of the status message data blocks into the user data blocks is therefore interrupted and the change message, also in the form of data blocks, is inserted in its place.
  • the corresponding data blocks are distributed over a sufficiently large number of useful data blocks.
  • the change message about the change in the status messages will contain significantly less data than the status messages themselves, so that the change message will only require a few data blocks. This allows subscriber terminals to be informed very quickly and easily about changes in the status messages without the subscriber terminal first having to wait for the complete transmission of updated status information.
  • Another advantage is that the insertion of the change message instead of status message data blocks does not influence the user data blocks.
  • the method according to the invention can be used to effectively guarantee that such update time periods are adhered to.
  • any type of such a system can be provided as a satellite data transmission system in the context of the present invention, in particular also a satellite communication system, with communication data being transmitted as user data.
  • a satellite navigation system is provided as the satellite data transmission system, navigation data being transmitted as user data.
  • satellite navigation systems are the GPS system or the GLONASS system, which are already known from US Pat. No. 6,205,377, or the future European satellite navigation system GALILEO, which is described, for example, in the previously cited document J. Benedicto et al. "GALILEO: Satellite System Design and Technology Developments" is known.
  • status messages can include, in particular, integrity messages relating to navigation satellites of a satellite navigation system, and change messages can be provided when there is a change in integrity information.
  • Information about the Functional integrity and / or the data integrity of navigation satellites can be transmitted from a navigation satellite, either integrity information about the own integrity of this navigation satellite, or about the integrity of a selected group of navigation satellites, or also about the integrity of all navigation satellites of the satellite navigation system (for example of the GALILEO system) to which the transmitting navigation satellite belongs alternatively or additionally, even integrity information is transmitted via navigation satellites of other satellite navigation systems (for example the GPS system or the GLONASS system). Alternatively or additionally, other types of status information and change messages can also be provided.
  • confirmation messages for emergency calls can also be transmitted as status information for emergency call devices in a satellite navigation system, e.g. Information about relief measures for emergency situations, about the position and equipment of emergency services or approaching emergency services etc.
  • the change message is inserted into the navigation data within a defined alarm time or within a fraction of a defined alarm time of the satellite navigation system that is defined for the distribution of status messages.
  • Such an alarm time has already been described in principle in US Pat. No. 6,205,377.
  • the method according to the invention can effectively guarantee that the transmission of the change message and thus the forwarding of this information to the subscriber terminals can actually take place within the alarm time, since the change message is inserted into user data blocks in exchange for status message data blocks.
  • the present invention further comprises a subscriber terminal for a satellite data transmission system, comprising a receiving device and a data processing device for receiving and processing user data blocks, into which data blocks of status messages have been inserted according to a method described above.
  • the subscriber terminal is therefore one of them trained to receive and process the user data blocks generated and transmitted according to the described methods, to recognize and process the data blocks of the status messages and, in particular, to reconstruct the status messages from them and finally to recognize and process the change messages.
  • the subscriber terminal can then update status messages possibly stored in the subscriber terminal on the basis of the detected change messages and, if necessary, take measures which are required on the basis of the information in the change message.
  • the subscriber terminal can be designed as a terminal of at least one satellite navigation system. It can therefore be designed either to receive data from a single satellite navigation system or from data from several satellite navigation systems.
  • the subscriber terminal can also be designed as a terminal of a satellite communication system.
  • the subscriber terminal can additionally be designed as a terminal of a further radio communication system, wherein this additional radio communication system can be a terrestrial or a satellite-based radio communication system.
  • the subscriber terminal can thus be designed, for example, as a mobile radio terminal which additionally has facilities for satellite communication or satellite navigation or, for example, as a satellite navigation terminal which also has facilities for data exchange via a mobile radio system.
  • it is provided for such a terminal that it has a first receiving device and a first data processing device for receiving and processing user data blocks of a satellite data transmission system and a second receiving device a second data processing device for receiving and processing user data blocks of another radio Communication system has. This therefore applies to the special case that both the satellite data transmission system and the radio communication system transmit data in the form of user data blocks.
  • Another object of the present invention is a computer program for processing user data blocks of a satellite data transmission system, data blocks of status messages being inserted into the user data blocks according to a method described above.
  • the computer program is designed to interact with devices - such as, in particular, a data processing device, possibly also a receiving device - of a subscriber terminal, as described above.
  • the computer program therefore processes user data blocks received in cooperation with a data processing device, in particular identifies data blocks of status messages and combines them again from status messages, recognizes change messages and, if necessary, initiates an update of stored status message data on the basis of the recognized change messages in the subscriber terminal.
  • the present invention comprises a computer program product including a machine-readable program carrier, on which a computer program described above is stored in the form of electronically readable control signals.
  • the control signals can be stored in any suitable form, and the electronic readout can then be carried out accordingly by means of electrical, magnetic, electromagnetic, electro-optical or other electronic methods.
  • Examples of such program carriers are magnetic tapes, floppy disks, hard disks, CD-ROMs or semiconductor devices.
  • Fig. 1 Schematic representation of integrity message data blocks in navigation data blocks
  • FIG. 2 shows a schematic representation of the insertion of change message data blocks instead of integrity message data blocks according to FIG. 1
  • FIG. 3 Schematic representation of the data transmission to a subscriber terminal
  • navigation data are transmitted in chronologically successive data blocks NAV1, NAV2, ... from navigation satellites that are in orbit around the earth to subscriber terminals.
  • Two such data blocks are shown by way of example in FIG. 1, which for example have a time length of 1 second for the GALILEO navigation system.
  • Selected data areas 1 are now reserved within these navigation data blocks, in which status information can be inserted, which are then transmitted to the subscriber terminals together with the navigation data become.
  • Integrity information about navigation satellites is to be provided here as status information, i.e. information that the subscriber terminal either knows about the transmitting navigation satellite itself, or about a selected group of, for example, six navigation satellites, or also about all navigation satellites of the satellite navigation system concerned (e.g. the GALILEO-Systems) inform whether and to what extent it can use the navigation signals of these navigation satellites to determine its own position.
  • information on the integrity of navigation satellites of other satellite navigation systems eg GPS or GLONASS
  • GPS or GLONASS can also be transmitted.
  • This integrity information can be generated using a known method, as described, for example, in the document J. Benedicto et al. "GALILEO: Satellite System Design and Technology Developments” is described, that is to say by certain control devices which then send integrity messages to certain or all of the navigation satellites, which in turn then integrate these integrity messages into useful data blocks in accordance with the present invention.
  • the integrity message INTEGRITY is broken down into individual data blocks that are significantly smaller than the navigation data blocks NAV1, NAV2.
  • the integrity data blocks are then inserted into the reserved data areas 1 of the navigation data blocks NAV1, NAV2, the total amount of integrity data per navigation data block ideally being chosen to be less than 25% in order to be able to transmit as much navigation data as possible per navigation data block.
  • the size of a single integrity data block in FIG. 1 is therefore a maximum of 5% of the data size of an entire navigation data block.
  • navigation data blocks NAV1, NAV2 are thus divided into the navigation data blocks NAV1, NAV2 and further, subsequent navigation data blocks and transmitted in this form to the subscriber terminals and retransmitted after completion of a transmission, if necessary in ac updated form, provided that the integrity information for the individual navigation satellites has changed in the meantime.
  • the integrity data blocks could in principle be inserted as a single compact block in each navigation data block NAV1, NAV2, that is to say only one, larger reserved data area 1 should be provided.
  • Integrity messages are therefore transmitted to the subscriber terminals in a regular sequence.
  • the transmission of these integrity messages can take a relatively long time, which can be longer than the alarm time of the satellite navigation system or the fraction of the alarm time that was defined for the distribution of integrity messages, i.e. the time within which the Subscriber terminals must be informed about significant changes in the integrity relationships within the satellite navigation system.
  • an alarm time of 6 seconds can be defined in a satellite navigation system, but only a fraction of it, for example 500 milliseconds or 1 second, can be defined as a fraction of the alarm time for the distribution of integrity messages.
  • the transmission of the integrity messages would take longer than the duration of two navigation data blocks, that is to say it would take longer than 2 seconds in the case of the GALILEO system.
  • the present invention guarantees that this alarm time specification is adhered to in a simple and effective manner, as shown in FIG. 2. If there is a change in the integrity information, instead of integrity data blocks, change message data blocks 2 are inserted directly into the reserved areas 1 of the navigation data blocks NAV1, NAV2, the number of change message data blocks 2 being based on the scope of the change message.
  • Change message data blocks 2 are therefore inserted into the integrity data blocks without influencing the navigation data in the navigation data blocks NAV1, NAV2. Nevertheless, the changed integrity information can be transmitted directly to the subscriber terminals.
  • FIG. 3 schematically shows a subscriber terminal (user terminal) UT for a satellite navigation system 3, of which a single navigation satellite is shown as an example in FIG. 3.
  • the subscriber terminal has a receiving device (Receiver Unit) RU1 and a data processing device (Data Processing Unit) DPU1 for receiving and processing navigation data blocks NAV1, NAV2.
  • the data processing device DPU is designed to recognize and process data blocks 1 of integrity messages INTEGRITY and to use them to restore the original integrity messages INTEGRITY as shown in FIGS. 1 and 2. These can then be stored in a data memory (not shown) of the subscriber terminal, which can then be accessed for further operation of the subscriber terminal if this is necessary.
  • the subscriber terminal UT is additionally designed as a terminal of a further radio communication system 4, in FIG. 3 as a terminal of a further mobile radio system.
  • This mobile radio system is indicated by way of example in FIG. 3 in the form of a base station (base station) BS of the mobile radio system.
  • the subscriber terminal has a second receiving device RU2 and a second data processing device DPU2 for receiving and processing user data blocks of the mobile radio system. It can thus be designed, for example, as a mobile phone which additionally contains a satellite navigation device.
  • the subscriber terminal UT can be set up in particular with the aid of a computer program for processing the navigation data blocks NAV1, NAV2 of the satellite navigation system using the method already described if the other hardware requirements are met in the subscriber terminal Ut.
  • the computer program then enables, in particular in cooperation with the data processing device DPU1. know and process the data blocks 1 of integrity messages INTEGRITY, which were inserted into the navigation data blocks NAV1, NAV2 according to a method described above.
  • the original integrity messages INTEGRITY can be restored from this with the help of the computer program.
  • These can then be stored in a data memory (not shown) of the subscriber terminal, which can then be accessed for further operation of the subscriber terminal if this is necessary.
  • the computer program also recognizes change messages 2 and initiates a corresponding update of stored status message data INTEGRITY on the basis of the recognized change messages 2 in the subscriber terminal UT.
  • the computer program can preferably be introduced into the subscriber terminal UT with the aid of a computer program product, the computer program product containing a machine-readable program carrier (data carrier) DC on which the computer program in the form of electronic readable control signals is stored.
  • a machine-readable program carrier data carrier
  • An example in the case of a cell phone would be a chip card with a semiconductor chip in which the computer program is stored.
  • all other suitable types of computer program products can also be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Radio Relay Systems (AREA)

Abstract

L'invention concerne un procédé pour transmettre des messages concernant des états (INTEGRITY) à des terminaux d'abonnés dans un système de transmission de données par satellite, notamment un système de navigation par satellite. Selon l'invention, les messages concernant des états sont divisés en blocs de données (1) plus petits que les blocs (NAV1, NAV2) des données utiles à transmettre, au moins un bloc de données (1) des messages concernant des états est introduit dans des blocs successifs (NAV1, NAV2) de données utiles et, en cas de modification des messages concernant des états (INTEGRITY), un message de modification (2) est introduit à la place d'un ou de plusieurs blocs de données (1) des messages concernant des états dans des blocs successifs (NAV1, NAV2) de données utiles.
EP02790334A 2001-11-08 2002-11-05 Procede pour transmettre des messages concernant des etats aux terminaux d'un systeme de transmission de donnees par satellite, notamment d'un systeme de navigation par satellite Withdrawn EP1449006A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10154493 2001-11-08
DE10154493 2001-11-08
DE10157619 2001-11-26
DE10157619A DE10157619C2 (de) 2001-11-08 2001-11-26 Verfahren zur Übertragung von Statusnachrichten an Endgeräte eines Satelliten-Datenübertragungssystems, insbesondere in einem Satelliten-Navigationssystem, sowie Teilnehmer-Endgerät, Computer-Programm und Computer-Programm-Produkt
PCT/EP2002/012313 WO2003040749A1 (fr) 2001-11-08 2002-11-05 Procede pour transmettre des messages concernant des etats aux terminaux d'un systeme de transmission de donnees par satellite, notamment d'un systeme de navigation par satellite

Publications (1)

Publication Number Publication Date
EP1449006A1 true EP1449006A1 (fr) 2004-08-25

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP02790334A Withdrawn EP1449006A1 (fr) 2001-11-08 2002-11-05 Procede pour transmettre des messages concernant des etats aux terminaux d'un systeme de transmission de donnees par satellite, notamment d'un systeme de navigation par satellite

Country Status (3)

Country Link
US (1) US6944534B2 (fr)
EP (1) EP1449006A1 (fr)
WO (1) WO2003040749A1 (fr)

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DE102005039807B4 (de) * 2005-08-22 2013-08-01 Astrium Gmbh Bereitstellung von Informationen in Satellitennavigationssystemen
BRPI0621511B1 (pt) * 2006-02-28 2019-03-19 Nokia Technologies Oy Aparelho, elemento de rede, sistema, módulo, método para utilizar dados de assistência, sinal para fornecer dados de assistência a um dispositivo, portador possuindo um sinalgravado em si e servidor de dados
FR2903779B1 (fr) 2006-07-11 2008-08-22 Alcatel Sa Dispositif de generation de messages de description de format de futurs messages relatifs a un systeme de navigation par satellites
DE102006046001A1 (de) * 2006-09-27 2008-04-03 Eads Astrium Gmbh Verfahren zum Einstellen der Integritätsalarmschranke in einem Satellitennavigationssystem
JP4998030B2 (ja) * 2007-03-20 2012-08-15 富士通株式会社 基地局装置、基地局装置における通信方法および基地局装置における通信プログラム
EP2003467B1 (fr) * 2007-06-13 2014-02-12 Astrium GmbH Solution de positionnement intégrée pour systèmes satellites de navigation globale
DE102008061321B4 (de) 2007-12-14 2014-01-30 Astrium Gmbh Verfahren, Empfänger und System zum Übertragen zusätzlicher Informationen mit Navigationsnachrichten in einem Satellitennavigationssystem
DE102008061319A1 (de) * 2007-12-14 2009-06-18 Astrium Gmbh Verfahren zum Übertragen zusätzlicher Informationen mit Navigationsnachrichten in einem Satellitennavigationssystem
FR3030057B1 (fr) * 2014-12-12 2017-01-27 Thales Sa Procede et systeme de validation de geolocalisation par satellite
CN108089214B (zh) 2017-12-20 2021-06-15 北京卫星导航中心 一种卫星定位方法和卫星定位系统
CN112399381B (zh) * 2020-10-29 2023-09-15 华人运通(江苏)技术有限公司 一种数据传输方法及车载以太网络传输系统

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Also Published As

Publication number Publication date
US6944534B2 (en) 2005-09-13
US20040248559A1 (en) 2004-12-09
WO2003040749A1 (fr) 2003-05-15

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