EP0295295A1 - Verfahren zur übertragung von daten mittels eines geostationären satelliten und wenigstens eines subsatelliten - Google Patents

Verfahren zur übertragung von daten mittels eines geostationären satelliten und wenigstens eines subsatelliten

Info

Publication number
EP0295295A1
EP0295295A1 EP88900949A EP88900949A EP0295295A1 EP 0295295 A1 EP0295295 A1 EP 0295295A1 EP 88900949 A EP88900949 A EP 88900949A EP 88900949 A EP88900949 A EP 88900949A EP 0295295 A1 EP0295295 A1 EP 0295295A1
Authority
EP
European Patent Office
Prior art keywords
satellite
satellites
transmission
sub
earth
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.)
Ceased
Application number
EP88900949A
Other languages
German (de)
English (en)
French (fr)
Inventor
Manfred Schukat
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.)
Airbus Defence and Space GmbH
Original Assignee
Messerschmitt Bolkow Blohm AG
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 Messerschmitt Bolkow Blohm AG filed Critical Messerschmitt Bolkow Blohm AG
Publication of EP0295295A1 publication Critical patent/EP0295295A1/de
Ceased 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
    • H04B7/195—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
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18513—Transmission in a satellite or space-based system
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L23/00—Apparatus or local circuits for systems other than those covered by groups H04L15/00 - H04L21/00
    • H04L23/02—Apparatus or local circuits for systems other than those covered by groups H04L15/00 - H04L21/00 adapted for orthogonal signalling
    • 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

Definitions

  • the invention relates to a method for transmitting data by means of a geostationary satellite and at least one sub-satellite, the sub-satellites being in lower orbits.
  • Communication satellites generally describe a geostationary orbit at a height of approximately 36,000 km above the equator. There they have a fixed orbit position, so that the same transmission frequency can be used for each satellite due to the distance between two neighboring satellites. As the geostationary orbit fills up slowly, other satellite orbits are planned, e.g. Subsatellite orbits with a height of a few hundred km or so-called quasi-stationary orbits. More details are e.g. the reference
  • this is achieved in that at least two data streams of the same frequency with different power / Hz are used for message transmission, the first data stream with higher power / Hz being used for connection to the geostationary satellite and the further data streams by means of PN (pseudo-noise) sequences are transmitted and serve to connect with the subsatellites.
  • PN pseudo-noise
  • 1 schematically shows the arrangement of the satellite orbits and the range of interference during transmission with the same frequency f ß ,
  • FIG. 3b shows the conditions in the transponder of the geostationary satellite with reception of the interference power.
  • Figure 1 shows schematically the arrangement of the satellite orbits.
  • the communications satellite S is located on a geostationary orbit at a distance of approximately 36,000 km, and the subsatellite S 2 on a subsatellite orbit at a distance of approximately 400 km - the former receives data from an earth station E, and the latter from another Earth station E ⁇ .
  • there is an interference area in which the two cones of the transmitting antennas overlap For this reason, as mentioned at the beginning, it is not readily possible to use the same frequencies for the two earth stations.
  • the structure of the PN sequences is constructed according to FIG 2 is that they have good correlation properties, which enables an exact De 'tetechnisch of Sig ⁇ Nals possible.
  • Each data bit is spread over the length of a PN sequence. If the length of the PN sequence is 1000 chips, for example, a data bit is represented by these 1000 chips.
  • the power per Hz to be applied in this way is therefore only 1/1000 of the power required in conventional methods. Both data streams are therefore decoupled from one another by a factor of 1000 in terms of their performance.
  • the transmissible useful bit rate is reduced by the factor of the spread compared to the conventional data stream by spreading the transmission spectrum, ie by using PN sequences.
  • PN sequences ie by using PN sequences.
  • a communication link with the same transmission frequency of 14 GHz is to be set up via a satellite S 2 , which is in a different orbit, for example in a circular orbit of lower height or an elliptical orbit.
  • the antenna may cover a certain area of the geostationary orbit on which the other satellite S is located and disrupts its message transmissions.
  • the ground station E now transmit according to FIG. 3a with a bandwidth of 10 MHz to the geostationary satellite S, and the ground station E 2 with the same bandwidth to the sub-satellite S 2 - but for transmission it uses PN sequences with a spreading factor of 1 1000 '.
  • the ground station E 2 can only transmit a useful bit rate of approx. 10 K bits compared to the 10 M bits of the ground station E,.
  • the transmission power required for the 10 KBits is distributed over 10 MHz, so that within the 10 MHz bandwidth of the geostationary satellite S-, its own signal is only disturbed by a factor of 1/1000. According to FIG. 3b, only the background noise of the transponder is increased.
  • +20 is steamed about 10.
  • Particularly expedient applications of the invention consist in that the additional data streams transmit information for controlling and / or regulating the message traffic between satellite-satellite and / or earth-satellite-earth or for controlling and / or regulating the satellites with respect to their orbit become.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Radio Relay Systems (AREA)
EP88900949A 1986-12-23 1987-12-19 Verfahren zur übertragung von daten mittels eines geostationären satelliten und wenigstens eines subsatelliten Ceased EP0295295A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3644176 1986-12-23
DE19863644176 DE3644176A1 (de) 1986-12-23 1986-12-23 Verfahren zur uebertragung von daten mittels eines geostationaeren satelliten und wenigstens eines subsatelliten

Publications (1)

Publication Number Publication Date
EP0295295A1 true EP0295295A1 (de) 1988-12-21

Family

ID=6317058

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88900949A Ceased EP0295295A1 (de) 1986-12-23 1987-12-19 Verfahren zur übertragung von daten mittels eines geostationären satelliten und wenigstens eines subsatelliten

Country Status (5)

Country Link
US (1) US4985706A (enrdf_load_stackoverflow)
EP (1) EP0295295A1 (enrdf_load_stackoverflow)
AU (1) AU607738B2 (enrdf_load_stackoverflow)
DE (1) DE3644176A1 (enrdf_load_stackoverflow)
WO (1) WO1988004866A1 (enrdf_load_stackoverflow)

Cited By (1)

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CN110224739A (zh) * 2019-06-04 2019-09-10 航天科工空间工程发展有限公司 一种低轨卫星系统通信链路频率干扰判断方法

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US5439190A (en) * 1991-04-22 1995-08-08 Trw Inc. Medium-earth-altitude satellite-based cellular telecommunications
US5433726A (en) * 1991-04-22 1995-07-18 Trw Inc. Medium-earth-altitude satellite-based cellular telecommunications system
FR2682238B1 (fr) * 1991-10-02 1994-10-07 Alcatel Espace Systeme de communications par satellites en orbite basse a destination de terminaux.
US5668556A (en) * 1991-10-02 1997-09-16 Alcatel Espace Low-orbit satellite communications system for terminals
DE4223995A1 (de) * 1992-07-21 1994-02-03 Kolbe & Co Hans Verfahren und Schaltung zur Netzsteuerung in Nachrichtenübertragungssystemen
US5666648A (en) * 1993-11-09 1997-09-09 Leo One Ip, L.L.C. Polar relay system for satellite communication
TW239242B (en) * 1994-03-28 1995-01-21 Leo One Ip L L C Satellite system using equatorial & polar orbit relays
TW274170B (en) * 1994-06-17 1996-04-11 Terrastar Inc Satellite communication system, receiving antenna & components for use therein
US5745084A (en) * 1994-06-17 1998-04-28 Lusignan; Bruce B. Very small aperture terminal & antenna for use therein
US6400926B1 (en) 1994-06-22 2002-06-04 Ericsson Ge Mobile Communications Inc. Radiocommunication system using geostationary and non-geostationary satellites
WO1996012356A2 (en) * 1994-10-12 1996-04-25 Leo One Ip, L.L.C. Optimal coverage satellite system for a low earth orbit store-and-forward telecommunication network
US5602838A (en) * 1994-12-21 1997-02-11 Lucent Technologies Inc. Global multi-satellite network
FR2730369B1 (fr) * 1995-02-02 1997-04-25 Bruno Louis Blachier Communications personnelles a l'aide de satellites geostationnaires et defilants basses orbites
JPH08213945A (ja) * 1995-02-06 1996-08-20 Atr Kodenpa Tsushin Kenkyusho:Kk 衛星通信システム
US5894590A (en) * 1995-07-31 1999-04-13 Motorola, Inc. Independent satellite-based communications systems sharing common frequency spectrum and method of operation thereof
FR2737627B1 (fr) * 1995-08-02 1997-10-03 Europ Agence Spatiale Systeme de transmission de signaux radioelectriques via un satellite de communication geostationnaire, notamment pour des communications avec des terminaux mobiles portables
US5906337A (en) * 1995-10-03 1999-05-25 Trw Inc. Multiple altitude satellite relay system and method
US5971324A (en) * 1995-10-03 1999-10-26 Trw Inc. Multiple altitude satellite relay system and method
CA2238753C (en) * 1995-12-07 2002-02-05 Vistar Telecommunications Inc. Method of improving efficiency of radio channel usage in overlapping coverage areas
US5943608A (en) * 1996-07-19 1999-08-24 At&T Corp. Traffic management methods for mitigation of interference between signals of satellite systems in relative motion
IL121764A0 (en) * 1996-11-25 1998-02-22 Motorola Inc Space-based communication systems
US5887257A (en) * 1996-12-05 1999-03-23 Motorola, Inc. Hybrid constellation satellite comunication systems and methods with efficient signaling and control
US6226494B1 (en) * 1997-09-23 2001-05-01 Teledesic Llc System and method for intermittent satellite communication with a fixed antenna
US6029935A (en) * 1998-01-22 2000-02-29 Trw Inc. Method for adding a geostationary component to a non-geostationary satellite network
US6892068B2 (en) 2000-08-02 2005-05-10 Mobile Satellite Ventures, Lp Coordinated satellite-terrestrial frequency reuse
US6859652B2 (en) 2000-08-02 2005-02-22 Mobile Satellite Ventures, Lp Integrated or autonomous system and method of satellite-terrestrial frequency reuse using signal attenuation and/or blockage, dynamic assignment of frequencies and/or hysteresis
US7792488B2 (en) * 2000-12-04 2010-09-07 Atc Technologies, Llc Systems and methods for transmitting electromagnetic energy over a wireless channel having sufficiently weak measured signal strength
DE10214977A1 (de) * 2002-04-04 2003-10-30 Deutsch Zentr Luft & Raumfahrt Globales Kommunikationssystem unter Einbeziehung von geostationären Kommunikationssatelliten
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FR2906423B1 (fr) * 2006-09-27 2008-12-26 Astrium Sas Soc Par Actions Si Procede et systeme de transmission de donnees entre un satellite et une station de base terrestre, et satellite defilant avec terminal relais et station de base pour la mise en oeuvre du procede
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110224739A (zh) * 2019-06-04 2019-09-10 航天科工空间工程发展有限公司 一种低轨卫星系统通信链路频率干扰判断方法

Also Published As

Publication number Publication date
DE3644176C2 (enrdf_load_stackoverflow) 1989-04-06
US4985706A (en) 1991-01-15
AU1152388A (en) 1988-07-15
AU607738B2 (en) 1991-03-14
DE3644176A1 (de) 1988-07-14
WO1988004866A1 (en) 1988-06-30

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