WO2001005062A1 - Leo satellite data transmission arrangement - Google Patents
Leo satellite data transmission arrangement Download PDFInfo
- Publication number
- WO2001005062A1 WO2001005062A1 PCT/AU2000/000685 AU0000685W WO0105062A1 WO 2001005062 A1 WO2001005062 A1 WO 2001005062A1 AU 0000685 W AU0000685 W AU 0000685W WO 0105062 A1 WO0105062 A1 WO 0105062A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- satellite
- user terminal
- control signal
- transmitted
- Prior art date
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
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00936552A EP1192738A4 (en) | 1999-07-13 | 2000-06-20 | Leo satellite data transmission arrangement |
AU52012/00A AU5201200A (en) | 1999-07-13 | 2000-06-20 | Leo satellite data transmission arrangement |
HK02102002.0A HK1040333A1 (en) | 1999-07-13 | 2002-03-15 | Leo satellite data transmission arrangement |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU39169/99 | 1999-07-13 | ||
AU39169/99A AU3916999A (en) | 1999-07-13 | 1999-07-13 | Leo satellite data transmission arrangement |
AUPQ2059 | 1999-08-05 | ||
AUPQ2059A AUPQ205999A0 (en) | 1999-08-05 | 1999-08-05 | Leo satellite data transmission arrangement |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001005062A1 true WO2001005062A1 (en) | 2001-01-18 |
Family
ID=25624674
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/AU2000/000685 WO2001005062A1 (en) | 1999-07-13 | 2000-06-20 | Leo satellite data transmission arrangement |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1192738A4 (en) |
CN (1) | CN1321372A (en) |
HK (1) | HK1040333A1 (en) |
TW (1) | TW466846B (en) |
WO (1) | WO2001005062A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002078215A1 (en) * | 2001-03-21 | 2002-10-03 | Hughes Electronics Corporation | Method for antenna positioning in a satellite user terminal |
US8810451B2 (en) | 2009-05-21 | 2014-08-19 | Zte Corporation | Communication antenna automatic orientation apparatus and method |
CN111355525A (en) * | 2020-03-10 | 2020-06-30 | 中国西安卫星测控中心 | Guide capture method for dual-frequency parabolic antenna |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995029538A1 (en) * | 1994-04-22 | 1995-11-02 | Stanford Telecommunications, Inc. | Cost effective geosynchronous mobile satellite communication system |
WO1997009634A1 (en) * | 1995-09-07 | 1997-03-13 | Centre National D'etudes Spatiales | Self-contained initialisation system for directional space links |
Family Cites Families (2)
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 |
FR2737346B1 (en) * | 1995-07-24 | 1997-08-29 | Alcatel Telspace | METHOD FOR CONTROLLING AN ANTENNA POSITIONER FOR SCROLLING SATELLITE |
-
2000
- 2000-06-12 TW TW089111444A patent/TW466846B/en active
- 2000-06-20 CN CN00801802A patent/CN1321372A/en active Pending
- 2000-06-20 EP EP00936552A patent/EP1192738A4/en not_active Withdrawn
- 2000-06-20 WO PCT/AU2000/000685 patent/WO2001005062A1/en not_active Application Discontinuation
-
2002
- 2002-03-15 HK HK02102002.0A patent/HK1040333A1/en unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1995029538A1 (en) * | 1994-04-22 | 1995-11-02 | Stanford Telecommunications, Inc. | Cost effective geosynchronous mobile satellite communication system |
WO1997009634A1 (en) * | 1995-09-07 | 1997-03-13 | Centre National D'etudes Spatiales | Self-contained initialisation system for directional space links |
Non-Patent Citations (1)
Title |
---|
See also references of EP1192738A4 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002078215A1 (en) * | 2001-03-21 | 2002-10-03 | Hughes Electronics Corporation | Method for antenna positioning in a satellite user terminal |
US8810451B2 (en) | 2009-05-21 | 2014-08-19 | Zte Corporation | Communication antenna automatic orientation apparatus and method |
CN111355525A (en) * | 2020-03-10 | 2020-06-30 | 中国西安卫星测控中心 | Guide capture method for dual-frequency parabolic antenna |
Also Published As
Publication number | Publication date |
---|---|
CN1321372A (en) | 2001-11-07 |
EP1192738A4 (en) | 2003-08-06 |
EP1192738A1 (en) | 2002-04-03 |
HK1040333A1 (en) | 2002-05-31 |
TW466846B (en) | 2001-12-01 |
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