CA2255220A1 - Efficient high latitude service area satellite mobile broadcasting systems - Google Patents

Efficient high latitude service area satellite mobile broadcasting systems Download PDF

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Publication number
CA2255220A1
CA2255220A1 CA002255220A CA2255220A CA2255220A1 CA 2255220 A1 CA2255220 A1 CA 2255220A1 CA 002255220 A CA002255220 A CA 002255220A CA 2255220 A CA2255220 A CA 2255220A CA 2255220 A1 CA2255220 A1 CA 2255220A1
Authority
CA
Canada
Prior art keywords
satellite
constellation
satellites
audio
broadcasting system
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.)
Granted
Application number
CA002255220A
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French (fr)
Other versions
CA2255220C (en
Inventor
Robert D. Briskman
Robert A. Nelson
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.)
Sirius XM Radio Inc
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Sirius XM Radio 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
Application filed by Sirius XM Radio Inc filed Critical Sirius XM Radio Inc
Publication of CA2255220A1 publication Critical patent/CA2255220A1/en
Application granted granted Critical
Publication of CA2255220C publication Critical patent/CA2255220C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H40/00—Arrangements specially adapted for receiving broadcast information
    • H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
    • H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
    • H04H40/90—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for satellite broadcast receiving
    • 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
    • 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
    • H04B7/18523—Satellite systems for providing broadcast service to terrestrial stations, i.e. broadcast satellite service

Abstract

Satellite audio broadcasting systems include orbital constellations for providing high elevation angle coverage of audio broadcast signals from the constellation's satellites to fixed and mobile receivers within service areas located at geographical latitudes well removed from the equator.

Claims (11)

  1. Claim 1 A satellite audio broadcasting system for mobile and fixed receivers in a geographical service area at latitudes above about 30 ° N or below about 30° S
    comprising a satellite constellation of 2 or more satellites, each in its own geosynchronous orbit, with each orbit having orbital parameters that provide high elevation angles throughout said area.
  2. Claim 2 The satellite audio broadcasting system of Claim 1 wherein audio broadcasts from said constellation to said mobile and fixed receivers are in the radio frequency range of about 1 to about 4 giga Hertz.
  3. Claim 3 The satellite audio broadcasting system of Claim 1 having the satellites in said constellation located in orbital planes separated from one another by a number of degrees equal to 360° divided by the number of satellites in the constellation.
  4. Claim 4 The satellite broadcasting system of claim 1 or claim 2 wherein said orbital parameters for each satellite in said constellation minimize passage of said satellites through the Van Allen radiation belts around the earth.
  5. Claim 5 The satellite audio broadcasting system of claim 1 or claim 2 wherein said orbital parameters minimize onboard satellite propulsion required to maintain each satellite in said constellation in its desired orbit.
  6. Claim 6 The satellite audio broadcasting system of claim 1 or claim 2 wherein said orbital parameters are selected from the group consisting of satellite antenna pointing angles, satellite pattern rotation angles and satellite antenna beam shapes.
  7. Claim 7 The satellite audio broadcasting system of claim 1 or claim 2 wherein said orbital parameters are selected from the group consisting of the inclination of each satellite, the eccentricity of the orbit for each satellite, the argument of perigee for each satellite in said constellation, the longitude of the ascending node of each orbit for each satellite in said constellation, and the ground trance for each satellite in said constellation.
  8. Claim 8 A method of providing audio satellite broadcast transmissions to fixed and mobile receivers in a target geographic area that is, at least in part, in a latitude above 30° N or a latitude below about 30° S comprising providing a constellation of satellites, with each satellite in its own orbital plane, each with a period of revolution around the earth substantially the same as the period of rotation of the earth on its axis, each with an inclination in the range of about 40°
    to about 80°, and each with an eccentricity of about 0.15 to about 0.30, and transmitting, from two or more of said satellites, audio broadcast signals that are substantially identical m content.
  9. Claim 9 The method of claim 8 further comprising providing spacial diversity between said audio broadcast signals from two or more satellites in said constellation.
  10. Claim 10 The method of claim 8 further comprising choosing orbital plane separations and relative satellite phasing among said satellites in said constellation to optimize transmissions of audio broadcast signals to said target geographic area.
    Claim 10 The method of claim 8 further comprising receiving, at said fixed and mobile receivers, from at least one satellite in said constellation, audio broadcast signals for reproduction at said fixed and mobile receivers.
  11. Claim 11 The method of claim 8 further comprising providing time diversity between substantially identical audio broadcast signals from two or more satellites in said constellation.
CA2255220A 1998-05-20 1998-12-21 Efficient high latitude service area satellite mobile broadcasting systems Expired - Fee Related CA2255220C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/082,489 US6223019B1 (en) 1996-03-14 1998-05-20 Efficient high latitude service area satellite mobile broadcasting systems
US09/082,489 1998-05-20

Publications (2)

Publication Number Publication Date
CA2255220A1 true CA2255220A1 (en) 1999-11-20
CA2255220C CA2255220C (en) 2011-11-29

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CA2255220A Expired - Fee Related CA2255220C (en) 1998-05-20 1998-12-21 Efficient high latitude service area satellite mobile broadcasting systems

Country Status (8)

Country Link
US (2) US6223019B1 (en)
EP (1) EP0959573A3 (en)
JP (1) JP3108689B2 (en)
CN (1) CN1174563C (en)
AU (1) AU759284B2 (en)
CA (1) CA2255220C (en)
MX (1) MXPA99001381A (en)
NO (1) NO318038B1 (en)

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Also Published As

Publication number Publication date
CA2255220C (en) 2011-11-29
NO990114L (en) 1999-11-22
AU9703098A (en) 1999-12-02
MXPA99001381A (en) 2005-04-11
NO318038B1 (en) 2005-01-24
AU759284B2 (en) 2003-04-10
JP3108689B2 (en) 2000-11-13
NO990114D0 (en) 1999-01-12
US6564053B1 (en) 2003-05-13
US6223019B1 (en) 2001-04-24
CN1236232A (en) 1999-11-24
EP0959573A3 (en) 2002-05-02
EP0959573A2 (en) 1999-11-24
JP2000013297A (en) 2000-01-14
CN1174563C (en) 2004-11-03

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