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EP1192738A1 - Agencement de transmission de donnees par satellite a orbite basse terrestre - Google Patents

Agencement de transmission de donnees par satellite a orbite basse terrestre

Info

Publication number
EP1192738A1
EP1192738A1 EP00936552A EP00936552A EP1192738A1 EP 1192738 A1 EP1192738 A1 EP 1192738A1 EP 00936552 A EP00936552 A EP 00936552A EP 00936552 A EP00936552 A EP 00936552A EP 1192738 A1 EP1192738 A1 EP 1192738A1
Authority
EP
European Patent Office
Prior art keywords
antenna
satellite
user terminal
control signal
transmitted
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Withdrawn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
EP00936552A
Other languages
German (de)
English (en)
Other versions
EP1192738A4 (fr
Inventor
Colin Rudolph
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.)
Alcatel Lucent SAS
Nokia Inc
Original Assignee
Alcatel SA
Nokia Inc
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 AU39169/99A external-priority patent/AU3916999A/en
Priority claimed from AUPQ2059A external-priority patent/AUPQ205999A0/en
Application filed by Alcatel SA, Nokia Inc filed Critical Alcatel SA
Publication of EP1192738A1 publication Critical patent/EP1192738A1/fr
Publication of EP1192738A4 publication Critical patent/EP1192738A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18517—Transmission equipment in earth stations
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/125—Means for positioning
    • H01Q1/1257—Means for positioning using the received signal strength
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/195—Non-synchronous stations

Definitions

  • This invention relates to low earth orbit (LEO) satellite communication systems, and in particular to a method and an arrangement for remotely activating the deactivated tracking mechanism of a directional tracking antenna associated with a terrestrial user terminal of such a system.
  • LEO low earth orbit
  • LEO satellite communication systems are known and typically comprise a constellation of satellites orbiting at an altitude of about 1500km, a plurality of terrestrial user terminals and a plurality of terrestrial gateway stations, the user terminals and the gateway stations being located in the footprint of a passing satellite's antenna beam.
  • the satellites provide a seamless radio communication path, typically in the Ku band, between the user terminals and the gateway stations, via their associated directional antennas.
  • This communication path provides a connection between a user terminal and a telecommunications network interfaced with a gateway station.
  • Users may be, for example, businesses, schools, hospitals, or private individuals in houses or apartments.
  • the antennas associated with the users terminal must be high gain directional antennas such as parabolic reflector antennas or Luneberg lens antennas, having a tracking mechanism to track the passing satellite.
  • the tracking directional antennas associated with a user terminal must be low cost. This is achieved by using relatively simple low cost tracking mechanisms as compared with more expensive complex precision tracking mechanisms. However, the working life of simple tracking mechanisms is less than the working life of the precision tracking.
  • a low earth orbit satellite communications system comprising a constellation of satellites, a plurality of terrestrial user terminals and a plurality of terrestrial gateway stations geographically remote from said user terminals, said user terminals and said gateway stations being geographically located in the footprint of a passing satellite's antenna beam, and each user terminal including at least one directional antenna means and an associated controllable antenna tracking mechanism means which is deactivated when said user terminal is not in use
  • a method of remotely activating a deactivated controllable antenna tracking mechanism comprising the steps of: Provide an auxiliary antenna means and an operatively associated radio receiver means whose output is coupled to control means of said controllable antenna tracking mechanism means:
  • control means Enable said control means with said enabling signal to activate said controllable antenna tracking mechanism to cause said directional antenna means to target and track a passing satellite for receiving data transmitted through said gateway station to said user terminal via the satellite.
  • a low earth orbit satellite communications system comprising a constellation of satellites, a plurality of terrestrial user terminals and a plurality of terrestrial gateway stations geographically remote from said user terminals, said user terminals and said gateway stations being geographically located in the footprint of a passing satellite's antenna beam, and each user terminal including at least one directional antenna means and an associated controllable antenna tracking mechanism means which is deactivated when said user terminal is not in use
  • each user terminal including at least one directional antenna means and an associated controllable antenna tracking mechanism means which is deactivated when said user terminal is not in use
  • an arrangement for remotely activating a deactivated controllable antenna tracking mechanism comprising an auxiliary antenna means, a radio receiver means operatively associated with said auxiliary antenna means and whose output is coupled to control means of said controllable antenna tracking mechanism means, means to cause a radio control signal of a predetermined frequency to be transmitted from a remote transmitter means to be received by said auxiliary antenna means and passed to said radio receiver means to produce an enabling signal at its output means to enable said control
  • Figure 1 shows a first embodiment of the present invention.
  • Figure 2 shows a second embodiment of the present invention.
  • Figure 3 shows a third embodiment of the present invention.
  • Figure 4 shows a fourth embodiment of the present invention.
  • a LEO communications system including a terrestrial gateway station 1 having a directional tracking antenna means 2 operatively associated therewith, an orbiting satellite 3, and a geographically remote user terminal which comprises a directional tracking antenna means 4, a tracking mechanism (not shown) operatively associated with an antenna tracking control means 4a, a transceiver 5, a processor 6, the users PC and telephone equipment 7, and an auxiliary omnidirectional antenna means 8 operatively associated with processor 6 via a receiver 9.
  • a radio control signal is transmitted through the gateway station 1 and relayed by satellite 3.
  • auxiliary omnidirectional antenna 8 receives and passes this control signal to receiver 9 whose output is processed in processor 6 to produce an enabling signal to enable the antenna tracking control means 4a to activate the tracking mechanism to enable the directional tracking antenna means 4 to target and track satellite 3 to receive and store the data.
  • the directional tracking antenna is deactivated.
  • the directional antenna means 4 is utilised as the auxiliary antenna and is fixedly aimed at a geostationary satellite 10 which relays a radio control signal selectively transmitted through the geostationary satellite's communication system and received by the fixed directional antenna 4 and passed to the associated transceiver to enable the control means 4a to activate the user terminal's tracking mechanism and enable the directional antenna 4 to target and track satellite 3 to receive and store transmitted data relayed by satellite 3.
  • this embodiment is similar to that described in relation to Figure 1 in that a radio control signal is passed from the omnidirectional antenna 8 to receiver 9 to produce an enabling signal to enable the antenna tracking control means 4a to activate the tracking mechanism, however in this embodiment the radio control signal is transmitted from a terrestrial paging system 1 1 .
  • Figure 4 shows a further implementation of the invention.
  • a precursor satellite 12 may be used to initiate the terminal by sending a wake-up signal to be received by the user terminal's auxiliary omnidirectional antenna 8.
  • the user terminal tracking antenna 4 and its associated tracking mechanism and tracking control means are initiated by the wake-up signal and process of locking on to the orbiting satellite 3 is commenced.
  • the precursor satellite has the ability to broadcast the wake-up signal over a paging channel to which the auxiliary receiver 9 is tuned.
  • the wake-up call may be a coded signal directed to a single user terminal, or it may be arranged to initiate a group of user terminals.
  • the precursor satellite's paging channel may be a narrow band channel, e.g., 9.6 kHz, as the wake-up call can be a brief message.
  • the precursor satellite 12 may be part of the communication system constellation, part of a separate constellation, or a geostationary satellite.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)

Abstract

L'invention concerne un système de communication par satellite à orbite basse terrestre (OBT) et un procédé d'activation à distance d'un mécanisme de repérage désactivé associé à l'antenne de repérage directe d'un terminal utilisateur terrestre d'un tel système lorsque ledit terminal n'est pas utilisé pendant des périodes de repos. Le mécanisme de repérage activé permet à l'antenne directive de cibler un satellite du système passant, les données pouvant alors être transmises au terminal utilisateur pendant ces périodes. Le procédé est réalisé par la mise en oeuvre d'une antenne auxiliaire équidirective et d'un récepteur associé au terminal utilisateur afin de recevoir un signal de commande radio sélectivement transmis par le biais du satellite de façon à activer un dispositif qui commande le mécanisme de repérage.
EP00936552A 1999-07-13 2000-06-20 Agencement de transmission de donnees par satellite a orbite basse terrestre Withdrawn EP1192738A4 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
AUPP039169 1999-07-13
AU39169/99A AU3916999A (en) 1999-07-13 1999-07-13 Leo satellite data transmission arrangement
AUPP205999 1999-08-05
AUPQ2059A AUPQ205999A0 (en) 1999-08-05 1999-08-05 Leo satellite data transmission arrangement
PCT/AU2000/000685 WO2001005062A1 (fr) 1999-07-13 2000-06-20 Agencement de transmission de donnees par satellite a orbite basse terrestre

Publications (2)

Publication Number Publication Date
EP1192738A1 true EP1192738A1 (fr) 2002-04-03
EP1192738A4 EP1192738A4 (fr) 2003-08-06

Family

ID=25624674

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00936552A Withdrawn EP1192738A4 (fr) 1999-07-13 2000-06-20 Agencement de transmission de donnees par satellite a orbite basse terrestre

Country Status (5)

Country Link
EP (1) EP1192738A4 (fr)
CN (1) CN1321372A (fr)
HK (1) HK1040333A1 (fr)
TW (1) TW466846B (fr)
WO (1) WO2001005062A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1371151A1 (fr) * 2001-03-21 2003-12-17 Hughes Electronics Corporation Procede de positionnement d'antenne dans un terminal utilisateur par satellite
US7636566B2 (en) * 2004-04-12 2009-12-22 Atc Technologies, Llc Systems and method with different utilization of satellite frequency bands by a space-based network and an ancillary terrestrial network
WO2010133029A1 (fr) * 2009-05-21 2010-11-25 中兴通讯股份有限公司 Appareil de direction automatique et procédé pour antenne de télécommunication
CN111355525B (zh) * 2020-03-10 2021-12-14 中国西安卫星测控中心 一种双频抛物面天线引导捕获方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5453753A (en) * 1993-09-08 1995-09-26 Dorne & Margolin, Inc. Mechanically steerable modular planar patch array antenna
US5589834A (en) * 1994-04-22 1996-12-31 Stanford Telecommunications, Inc. Cost effective geosynchronous mobile satellite communication system
FR2737346B1 (fr) * 1995-07-24 1997-08-29 Alcatel Telspace Procede de commande d'un positionneur d'antenne pour satellite a defilement
FR2738696B1 (fr) * 1995-09-07 1997-11-21 Centre Nat Etd Spatiales Systeme d'initialisation autonome de liaisons spatiales directives

Also Published As

Publication number Publication date
HK1040333A1 (zh) 2002-05-31
CN1321372A (zh) 2001-11-07
TW466846B (en) 2001-12-01
WO2001005062A1 (fr) 2001-01-18
EP1192738A4 (fr) 2003-08-06

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