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NZ748253B2 - Dual leo satellite system and method for global coverage - Google Patents
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NZ748253B2 - Dual leo satellite system and method for global coverage - Google Patents

Dual leo satellite system and method for global coverage Download PDF

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Publication number
NZ748253B2
NZ748253B2 NZ748253A NZ74825317A NZ748253B2 NZ 748253 B2 NZ748253 B2 NZ 748253B2 NZ 748253 A NZ748253 A NZ 748253A NZ 74825317 A NZ74825317 A NZ 74825317A NZ 748253 B2 NZ748253 B2 NZ 748253B2
Authority
NZ
New Zealand
Prior art keywords
satellites
satellite
satellite system
constellation
leo
Prior art date
Application number
NZ748253A
Other versions
NZ748253A (en
Inventor
David Wendling
Original Assignee
Telesat Technology Corporation
Filing date
Publication date
Priority claimed from CA2927217A external-priority patent/CA2927217A1/en
Application filed by Telesat Technology Corporation filed Critical Telesat Technology Corporation
Publication of NZ748253A publication Critical patent/NZ748253A/en
Publication of NZ748253B2 publication Critical patent/NZ748253B2/en

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
    • 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
    • H04B7/18513—Transmission in a satellite or space-based system
    • 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
    • H04B7/18521—Systems of inter linked satellites, i.e. inter satellite service
    • 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
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18532—Arrangements for managing transmission, i.e. for transporting data or a signalling message
    • H04B7/18534—Arrangements for managing transmission, i.e. for transporting data or a signalling message for enhancing link reliablility, e.g. satellites diversity
    • 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
    • H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/65—Arrangements characterised by transmission systems for broadcast
    • H04H20/71—Wireless systems
    • H04H20/74—Wireless systems of satellite networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/86—Arrangements characterised by the broadcast information itself
    • H04H20/91—Arrangements characterised by the broadcast information itself broadcasting computer programmes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/06—Airborne or Satellite Networks

Abstract

The present invention relates to satellite systems and more particularly, to the provision of a satellite system and method for communications applications, with global coverage. An optimal method of providing global broadband connectivity has been discovered which uses two different LEO (low Earth orbit) constellations with inter-satellite links among the satellites in each constellation, and inter-satellite links between the constellations. The first constellation is deployed in a polar LEO orbit with a preferred inclination of 99.5 degrees and a preferred altitude of 1000 km. The second constellation is deployed in an inclined LEO orbit with a preferred inclination of 37.4 degrees and a preferred altitude of 1250 km. The system also comprises a first user terminal for transmitting to, and receiving signals from, said first and second set of satellites. The system further comprises a Gateway, a base station or a second user terminal for transmitting to, and receiving signals from, said first and second set of satellites.

Claims (19)

WHAT IS CLAIMED IS:
1. A satellite system for global communications comprising: a first set of satellites in a polar LEO (low Earth orbit) constellation; a second set of satellites in an inclined LEO constellation; a first user terminal for transmitting to, and receiving signals from, said first and second set of satellites; and a Gateway, a base station or a second user terminal for transmitting to, and receiving signals from, said first and second set of satellites; each of said first and second set of satellites having an ISL (inter-satellite link) functionality with respect to satellites in the polar LEO constellation and with satellites in the inclined LEO constellation.
2. The satellite system of claim 1, wherein said polar LEO constellation comprises six planes, equally spaced.
3. The satellite system of claim 2, wherein said planes of said polar LEO constellation are inclined between 80 degrees and 100 degrees.
4. The satellite system of claim 3, wherein said planes of said polar LEO constellation are inclined about 99.5 degrees.
5. The satellite system of any one of claims 1 to 4, wherein said inclined LEO constellation comprises five planes, equally spaced.
6. The satellite system of claim 5, wherein said planes of said inclined LEO constellation are inclined between 5 degrees and 75 degrees.
7. The satellite system of claim 6, wherein said planes of said inclined LEO constellation are inclined about 37.4 degrees.
8. The satellite system of any one of claims 1 to 7, wherein said polar LEO constellation comprises about 72 satellites and said inclined LEO constellation comprises about 45 satellites, the system thereby providing global coverage with a minimum elevation angle of about 20 degrees.
9. The satellite system of any one of claims 1 to 8, wherein said satellites of said polar LEO constellation orbit at an altitude of between 800 km and 1400 km.
10. The satellite system of claim 9, wherein said satellites of said polar LEO constellation orbit at an altitude of about 1000 km.
11. The satellite system of any one of claims 1 to 8, wherein said satellites of said inclined LEO constellation orbit at an altitude of between 800 km and 1400 km.
12. The satellite system of claim 11, wherein said satellites of said inclined LEO constellation orbit at an altitude of about 1250 km.
13. The satellite system of any one of claims 1 to 12, wherein the Gateway, the base station or the second user terminal are operable to avoid interference with a GEO (Geostationary Earth Orbit) satellite user terminal by switching the Gateway, the base station or the second user terminal to an alternate LEO satellite that has an angular separation with a GEO satellite greater than a calculated discrimination angle, as measured at the GEO satellite user terminal.
14. The satellite system of any one of claims 1 to 12, wherein excess capacity in the polar LEO constellation in the higher latitudes is used to transfer data traffic, via the ISL, from both LEO constellations to a Gateway located in the North for connection to a terrestrial network.
15. The satellite system of any one of claims 1 to 12, each of said first and second set of satellites having an IP router functionality.
16. The satellite system of claim 15, each of said first and second set of satellites having an IP router load management functionality.
17. The satellite system of any one of claims 1 to 16, wherein said signals comprise broadband communication signals.
18. The satellite system of any one of claims 1 to 17, where said first user terminal includes an electronically scanned array antenna for communicating with said first and second set of satellites.
19. A method of operation for a global communications satellite system comprising: launching a first set of satellites in a polar LEO (low Earth orbit) constellation; launching a second set of satellites in an inclined LEO constellation; using a user terminal, transmitting communications data to a first satellite in said first or second set of satellites; transmitting said communications data from said first satellite, to a second satellite in said polar LEO constellation using an ISL (inter-satellite link); and transmitting said communications data from said second satellite, to a polar Gateway. 1 / 9
NZ748253A 2017-04-18 Dual leo satellite system and method for global coverage NZ748253B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA2927217A CA2927217A1 (en) 2016-04-14 2016-04-14 Dual leo satellite system and method for global coverage
PCT/CA2017/050476 WO2017177343A1 (en) 2016-04-14 2017-04-18 Dual leo satellite system and method for global coverage

Publications (2)

Publication Number Publication Date
NZ748253A NZ748253A (en) 2024-11-29
NZ748253B2 true NZ748253B2 (en) 2025-03-04

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