CA2422601A1 - Satellite communications system - Google Patents

Satellite communications system Download PDF

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Publication number
CA2422601A1
CA2422601A1 CA002422601A CA2422601A CA2422601A1 CA 2422601 A1 CA2422601 A1 CA 2422601A1 CA 002422601 A CA002422601 A CA 002422601A CA 2422601 A CA2422601 A CA 2422601A CA 2422601 A1 CA2422601 A1 CA 2422601A1
Authority
CA
Canada
Prior art keywords
satellite
spread
quasi
signal
downlink signal
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
CA002422601A
Other languages
French (fr)
Other versions
CA2422601C (en
Inventor
Gerhard Bethscheider
Guy Harles
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.)
SES Astra SA
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2422601A1 publication Critical patent/CA2422601A1/en
Application granted granted Critical
Publication of CA2422601C publication Critical patent/CA2422601C/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H04B7/19—Earth-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
    • H04B7/204—Multiple access
    • H04B7/216—Code division or spread-spectrum multiple access [CDMA, SSMA]
    • 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
    • H04B7/18569—Arrangements for system physical machines management, i.e. for construction operations control, administration, maintenance

Abstract

The invention refers to a satellite communications system with a mobile user terminal. In order to provide a satellite communications system which enables communication with a mobile user terminal via conventional communication satellites on any area of interest on earth, a quasi-geostationary satellite is operated in an inclined orbit and sends a spread downlink signal s'(t) to said area of interest on earth to be received and despreaded by a mobile user terminal.

Claims (11)

1. Method for illuminating an area of interest on earth with a downlink signal, comprising the steps of:
operating a quasi-geostationary satellite in an inclined orbit, and sending a spread downlink signal s'(t) from said quasi-geostationary satellite to said area of interest on earth.
2. Method according to claim 1, further comprising the steps of modulating an uplink signal p(t) by spread spectrum modulation with a certain spreading ratio to generate a spread uplink signal s(t), transmitting said spread uplink signal s(t) to said quasi-geostationary satellite, and converting said spread uplink signal s(t) to said spread downlink signal s'(t).
3. Method according to claim 1, comprising the steps of transmitting an uplink signal to said quasi-geostationary satellite, on-board processing in said quasi-geostationary satellite the uplink signal by spread spectrum modulation with a certain spreading ratio to generate said spread downlink signal s'(t).
4. Method according to one of the claims 1 - 3, wherein the station keeping control of said satellite is restricted to longitude drift corrections and eccentricity corrections.
5. Method according to one of the claims 1 - 4, wherein additional satellites are operated in co-location with said quasi-geostationary satellite forming a satellite cluster.
6. Method according to claim 5, wherein each satellite in said satellite cluster sends a separate spread downlink signal s i'(t).
7. Method according to claim 6, wherein each spread downlink signal s i'(t) is given its own spreading sequence with low pair-wise cross-correlation for code-division multiple access (CDMA).
8. Method according to one of the claims 5 - 7, wherein at least two satellites of said satellite cluster send a reference signal, wherein each reference signal comprises a reference time information and a reference orbit information with regard to the sending satellite.
9. Mobile user terminal, comprising:
a mobile antenna with a low directivity, adapted to receive a spread downlink signal s'(t), which is emitted by a quasi-geostationary satellite operated in an inclined orbit, and a processing unit for demodulating said spread downlink signal s'(t) by spread spectrum demodulation.
10. Mobile user terminal according to claim 9, wherein the mobile antenna is adapted to receive signals with a frequency of above lOGHz.
11. Mobile user terminal according to one of the claims 9 - 10, wherein the mobile antenna is adapted to-receive reference signals sent from the quasi-geostationary satellite and at least another satellite operated in co-location with the quasi-geostationary satellite, wherein each reference signal comprises a reference~time information and a reference orbit information with regard to the sending satellite and wherein the processing unit comprises a location processor for determining the coordinates of the mobile user terminal on the basis of the reference signals.
CA2422601A 2000-09-28 2001-09-27 Satellite communications system Expired - Lifetime CA2422601C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
PCT/EP2000/009520 WO2002027974A2 (en) 2000-09-28 2000-09-28 Satellite communications system
EPPCT/EP00/09520 2000-09-28
PCT/EP2001/011206 WO2002027976A1 (en) 2000-09-28 2001-09-27 Spread spectrum communication system using a quasi-geostationary satellite

Publications (2)

Publication Number Publication Date
CA2422601A1 true CA2422601A1 (en) 2002-04-04
CA2422601C CA2422601C (en) 2011-11-08

Family

ID=8164111

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2422601A Expired - Lifetime CA2422601C (en) 2000-09-28 2001-09-27 Satellite communications system

Country Status (15)

Country Link
US (1) US7539456B2 (en)
EP (1) EP1320949B1 (en)
JP (1) JP2004510393A (en)
CN (1) CN1220342C (en)
AR (1) AR042581A1 (en)
AT (1) ATE354214T1 (en)
AU (3) AU2000279094A1 (en)
BR (1) BRPI0114174B1 (en)
CA (1) CA2422601C (en)
DE (1) DE60126627T2 (en)
EA (1) EA004692B1 (en)
ES (1) ES2283444T3 (en)
HK (1) HK1054280B (en)
PT (1) PT1320949E (en)
WO (2) WO2002027974A2 (en)

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Also Published As

Publication number Publication date
CN1220342C (en) 2005-09-21
EA200300410A1 (en) 2003-10-30
AU1499402A (en) 2002-04-08
WO2002027974A3 (en) 2007-11-29
US20030181161A1 (en) 2003-09-25
WO2002027976A1 (en) 2002-04-04
HK1054280B (en) 2007-06-22
BR0114174A (en) 2003-07-22
PT1320949E (en) 2007-05-31
AR042581A1 (en) 2005-06-29
HK1054280A1 (en) 2003-11-21
EP1320949A2 (en) 2003-06-25
CN1455992A (en) 2003-11-12
US7539456B2 (en) 2009-05-26
AU2000279094A1 (en) 2002-04-08
CA2422601C (en) 2011-11-08
EA004692B1 (en) 2004-06-24
WO2002027974A2 (en) 2002-04-04
DE60126627D1 (en) 2007-03-29
BRPI0114174B1 (en) 2016-05-31
ATE354214T1 (en) 2007-03-15
JP2004510393A (en) 2004-04-02
ES2283444T3 (en) 2007-11-01
WO2002027976A8 (en) 2002-06-06
AU2002214994B2 (en) 2005-04-21
DE60126627T2 (en) 2007-12-06
EP1320949B1 (en) 2007-02-14
AU2000279094A8 (en) 2008-01-24

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Effective date: 20210927