WO2004057777A2 - Plate-forme mobile destinee a regulariser la qualite d'une communication par satellite - Google Patents

Plate-forme mobile destinee a regulariser la qualite d'une communication par satellite Download PDF

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Publication number
WO2004057777A2
WO2004057777A2 PCT/IL2003/001058 IL0301058W WO2004057777A2 WO 2004057777 A2 WO2004057777 A2 WO 2004057777A2 IL 0301058 W IL0301058 W IL 0301058W WO 2004057777 A2 WO2004057777 A2 WO 2004057777A2
Authority
WO
WIPO (PCT)
Prior art keywords
signal
mobile platform
receiving
retransmission
characteristic
Prior art date
Application number
PCT/IL2003/001058
Other languages
English (en)
Other versions
WO2004057777A3 (fr
Inventor
Dov Zahavi
Original Assignee
Elbit Systems Ltd.
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 Elbit Systems Ltd. filed Critical Elbit Systems Ltd.
Priority to AU2003288488A priority Critical patent/AU2003288488A1/en
Publication of WO2004057777A2 publication Critical patent/WO2004057777A2/fr
Publication of WO2004057777A3 publication Critical patent/WO2004057777A3/fr

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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
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18539—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection
    • H04B7/18543—Arrangements for managing radio, resources, i.e. for establishing or releasing a connection for adaptation of transmission parameters, e.g. power control

Definitions

  • the present invention relates generally to mobile platform to satellite communication, and in particular, to methods and systems for monitoring the quality of transmissions between mobile platforms and satellites.
  • Satellite-based communication networks typically use narrow beam antennas for directing transmitted energy from a transmitter to a satellite, and from it to receivers, thus enabling use of low transmit power, and eliminating or minimizing side lobe energy dissipation.
  • Communication satellites are sometimes located relatively close to each other. Hence, if energy transmitted from a ground station to a satellite is transmitted omni-directionally or has side lobes having high enough power, it may interfere with transmissions of an adjacent satellite.
  • a monitoring capability is required, so that an interfering transmitter may be identified, its operator may be notified of the interference, and its interfering transmitted energy may be controlled.
  • a mobile platform is identified by an identifier that is included in its transmission.
  • This identifier enables a satellite communication system to monitor interfering transmissions by identifying a mobile platform that may be interfering with its operation, and possibly notifying the interfering mobile station accordingly.
  • the mobile platform may detect interference, identify the reasons for the interference, and function to rectify or minimize such interference.
  • Fig. 1A is a schematic illustration of architecture of a satellite based communication system
  • Fig. 1 B is a schematic illustration of various situations of transmissions in a satellite based communication system
  • Fig. 2 is a schematic block diagram of communication between a mobile transmitter and satellites
  • Fig. 3 is a schematic block diagram of another aspect of communication between a mobile transmitter and satellites according to the present invention.
  • Fig. 4 is a schematic block diagram of a mobile platform that includes a wide band receive-only antenna and a narrow band antenna in active connection with a transmit / receive unit;
  • Fig. 5 is a table of some possible detected transmission problems based on transmission and signal information at the mobile platform. It will be appreciated that for simplicity and clarity of illustration, elements shown in the figures have not necessarily been drawn to scale. For example, the
  • each of the satellites in a network has its respective coverage
  • satellite-based communication networks 10 typically include
  • the antenna installed in a mobile platform for linking to satellite
  • Fig. 1 B communication satellites 22 and 24 are sometimes located relatively close to each other. In the case of a directional transmitter 26, this is not generally a problem, as the transmission to satellite 22 does not interfere with satellite 24. However, if energy transmitted from ground station 28 to satellite 22 is transmitted omni-directionally or has side lobes having high enough power, it may interfere with adjacent satellite 24. Such interference is also represented in Fig.2, where the mobile platform 52 is in two-way communication with satellite 54, but uni-directionally interferes with satellite 56.
  • a mobile transmitter may have an interferring effect that changes in time and location.
  • a system and method are provided for enabling the identification of an interfering mobile transmitter within a satellite communication system.
  • FIG. 3 is a schematic block diagram of satellite communication system 70, constructed and working according to an embodiment of the present invention.
  • identification (ID) unit 74 is in operative connection with mobile transmitter 72. Transmission 81 from mobile platform 96 is directed to satellite 76, in the coverage area of which it is currently located.
  • An identification (ID) signal is produced by ID unit 74 (represented by line 75) and incorporated with transmission 80 of transmitter 72 to create a combined transmission signal (represented by line 81). ID signal 75 is unique for each mobile transmitter 72.
  • An ID unit 92 may be incorporated in active connection with a ground portion of the satellite communication system, or at the satellite operator's satellite ground control station to detect and identify ID signal portion in a received transmission, and thereby associate a transmission with a mobile platform.
  • the interfered satellite may notifiy its operator of the interference and identify the interfering mobile platform 96. The operator of an interferred satellite is then able to commuplexe with interfering mobile platform 96 and notify it of the interference.
  • ID signal 75 may be incorporated into a transmission signal 80 on a time-share basis. Since typically an ID signal contains very little information, it needs a very low duty-cycle and thereby it consumes very little of the transmission channel time resources.
  • ID signal 75 may also be transmitted on a frequency-share basis. Here also, since the bandwidth needed for transmitting ID signal 75 is very narrow, it consumes very small portion of the transmission channel frequency resources. In a further embodiment, for the purpose of reducing the interfering effect of the ID signal, it is possible to use both time and frequency sharing techniques. ID signal 75 may also contain additional information apart from ' an identifying signal, including but not limited to, for example, an identification of satellite 76
  • the format of ID signal 75 may be of several types. In one embodiment of
  • ID signal may be of fixed frequency pilot signal type.
  • satellite frequency band type e.g., C Band, Ku Band etc.
  • This allocated band may be very narrow, is determined by the normal accuracy of the
  • ID signal 75 may then be transmitted along with the data
  • interfering mobile platform 96 may be notified of the situation by its operator, via
  • ID signal may be any type of the present invention.
  • the ID signal format may be modulated in-band. According to this format an AM modulation is added on top of the spread spectrum data signal.
  • a system and method are provided for autonomously controlling the power and mode of transmission from a mobile platform as a response to detected interference of this transmission, so as to reduce or eliminate this interference.
  • the mobile platform may reduce the interference to an acceptable level.
  • FIG. 4 is a schematic block diagram of a mobile platform 100 according to an embodiment of the present invention.
  • a wide band receive-only antenna 108 and a narrow band antenna 106 may be in active connection with a transmit/receive unit 104.
  • Wide band antenna 108 may be capable of receiving a signal (hereinafter, BEACON signal) transmitted by a ground station (not shown) via a satellite 120 with which mobile system 100 may be in communication.
  • a common BE ⁇ ACON signal may be used for all mobile transmit/receive units active in a satellite communication system.
  • a signal hereinafter, PILOT signal
  • PILOT signal may be transmitted by mobile system 100 to satellite 120.
  • PILOT signal may be retransmitted by satellite 120 and may be received by both wide band antenna 108 and narrow band antenna 106, as well as by the ground station. PILOT signal may be unique for each MS 100. Signals representing the level of received PILOT signal the level of received BEACON signal and the transmission power level may be provided to processor unit 102, which may be any kind of digital processor in active connection with transmit / receive unit 104. Additionally, signals representing the spatial attitude of mobile system 100, such as ground related location, pitch, yaw and roll signals, etc. may be provided to processor unit 102.
  • Transmission problems that may be detected may include, without limitation, a transmitting antenna went off-direction from satellite 120; transmit and receive antennas became temporarily misaligned with satellite 120 due to a temporary maneuvere of mobile system 100; transmitted power level has exceeded a maximum permitted level; narrow band antenna 106 malfunctions; wide band antenna 108 malfunctions; ambient or atmospheric conditions interfere with transmissions, ground station / satellite malfunction, etc.
  • the process of detection and identification of an occurence of malfunction in a transmission between mobile platform 100 and satellite 120 may be initiated each time there is a change in the level of any of signals provided to processor unit 102. Detecting and identifying a malfunction may be performed, for example, based on a signal status table.
  • Fig. 5 shows a signal status table that may be used in one embodiment of the present invention. In Fig. 5, these transmission problems may be identified by detecting changes in power levels between the received BEACON and PILOT signals. It will be evident to those of skill in the art that other problems may also be detected from calculations based on the signals received by antennas and other instruments. Based on the nature of the autonomously detected malfunction, such as the ones depicted in Fig.
  • PILOT signal may be received by ground station of satellite 120, analyzed for extraction of information on level of PILOT signal and on satellite 120, and then transmited back to mobile platform 100 via satellite 120.
  • Embodiments of the present invention may include other apparatuses for performing the operations herein. Such apparatuses may integrate the elements of the mobile platform discussed, or may comprise alternative components to carry out the same purpose. It will be appreciated by persons skilled in the art that the present invention is not limited to what has been particularly shown and described hereinabove. Rather, the scope of the present invention is defined only by the claims, which follow:

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  • 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)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)

Abstract

Selon un aspect de l'invention, une plate-forme mobile est identifiée au moyen d'un identificateur qui est prévu dans sa transmission. L'identificateur permet à un système de communication par satellite de contrôler le brouillage des transmissions en identifiant une plate-forme mobile, susceptible de perturber son fonctionnement et, éventuellement, de signaler en conséquence la station mobile brouilleuse. Conformément à un autre aspect de l'invention, par comparaison de signaux communiqués entre une plate-forme mobile et un satellite, la plate-forme mobile peut détecter le brouillage, identifier les raisons de ce brouillage, et fonctionner de manière à rectifier ou à minimiser un tel brouillage.
PCT/IL2003/001058 2002-12-22 2003-12-11 Plate-forme mobile destinee a regulariser la qualite d'une communication par satellite WO2004057777A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003288488A AU2003288488A1 (en) 2002-12-22 2003-12-11 Mobile platform to satellite communication quality control

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL153572 2002-12-22
IL15357202A IL153572A0 (en) 2002-12-22 2002-12-22 Mobile platform to satellite communication quality control

Publications (2)

Publication Number Publication Date
WO2004057777A2 true WO2004057777A2 (fr) 2004-07-08
WO2004057777A3 WO2004057777A3 (fr) 2007-10-18

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PCT/IL2003/001058 WO2004057777A2 (fr) 2002-12-22 2003-12-11 Plate-forme mobile destinee a regulariser la qualite d'une communication par satellite

Country Status (3)

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AU (1) AU2003288488A1 (fr)
IL (1) IL153572A0 (fr)
WO (1) WO2004057777A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012122560A2 (fr) 2011-03-10 2012-09-13 Comtech Ef Data Corp. Procédé pour la commande d'une liaison de communication sans fil afin de réduire les interférences d'un satellite voisin
WO2016064281A3 (fr) * 2014-10-24 2016-09-01 Amundsen Petter Chr Procédés et dispositif permettant de mesurer le niveau de brouillage de terminaux tdma vsat provoquant un brouillage contrapolaire et/ou entre satellites voisins dans une liaison de communication
US10587333B2 (en) 2016-12-13 2020-03-10 Inmarsat Global Limited Forward link power control

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0772317A2 (fr) * 1995-11-06 1997-05-07 He Holdings, Inc. Dba Hughes Electronics Commande adaptative de puissance et de codage pour communications par satellites
WO1998045962A1 (fr) * 1997-04-04 1998-10-15 Ericsson, Inc. Gestion de la puissance d'un terminal mobile dans un systeme de communications par satellites
US5828335A (en) * 1995-11-06 1998-10-27 Martin Marietta Corporation Spacecraft communication channel power control system
EP0998060A2 (fr) * 1998-10-30 2000-05-03 TRW Inc. Méthode d'amélioration de la performance d'algorithmes de commande de puissance en boucle ouverte pour des systèmes de communication par satellite
US6167240A (en) * 1997-05-30 2000-12-26 Telefonaktiebolaget Lm Ericsson System and method relating to cellular communication systems
EP1244228A2 (fr) * 2001-03-23 2002-09-25 Trw Inc. Contrôle de puissance de la liaison montante dans un système de communication par satellite
US20020151278A1 (en) * 2001-04-04 2002-10-17 Mclain Christopher John Method and apparatus using variations in power modulation to determine an interfering mobile terminal

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0772317A2 (fr) * 1995-11-06 1997-05-07 He Holdings, Inc. Dba Hughes Electronics Commande adaptative de puissance et de codage pour communications par satellites
US5828335A (en) * 1995-11-06 1998-10-27 Martin Marietta Corporation Spacecraft communication channel power control system
WO1998045962A1 (fr) * 1997-04-04 1998-10-15 Ericsson, Inc. Gestion de la puissance d'un terminal mobile dans un systeme de communications par satellites
US6167240A (en) * 1997-05-30 2000-12-26 Telefonaktiebolaget Lm Ericsson System and method relating to cellular communication systems
EP0998060A2 (fr) * 1998-10-30 2000-05-03 TRW Inc. Méthode d'amélioration de la performance d'algorithmes de commande de puissance en boucle ouverte pour des systèmes de communication par satellite
EP1244228A2 (fr) * 2001-03-23 2002-09-25 Trw Inc. Contrôle de puissance de la liaison montante dans un système de communication par satellite
US20020151278A1 (en) * 2001-04-04 2002-10-17 Mclain Christopher John Method and apparatus using variations in power modulation to determine an interfering mobile terminal

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012122560A2 (fr) 2011-03-10 2012-09-13 Comtech Ef Data Corp. Procédé pour la commande d'une liaison de communication sans fil afin de réduire les interférences d'un satellite voisin
EP2684301A4 (fr) * 2011-03-10 2015-05-13 Comtech Ef Data Corp Procédé pour la commande d'une liaison de communication sans fil afin de réduire les interférences d'un satellite voisin
WO2016064281A3 (fr) * 2014-10-24 2016-09-01 Amundsen Petter Chr Procédés et dispositif permettant de mesurer le niveau de brouillage de terminaux tdma vsat provoquant un brouillage contrapolaire et/ou entre satellites voisins dans une liaison de communication
US20170353231A1 (en) * 2014-10-24 2017-12-07 Kratos Norway As Method and device for measuring the interference level of vsat tdma terminals causing cross-polar and/or terminals causing cross-polar and/or communication link
US9991946B2 (en) 2014-10-24 2018-06-05 Kratos Norway As Method and device for measuring the interference level of VSAT TDMA terminals causing cross-polar and/or terminals causing cross-polar and/or communication link
US10587333B2 (en) 2016-12-13 2020-03-10 Inmarsat Global Limited Forward link power control

Also Published As

Publication number Publication date
AU2003288488A1 (en) 2004-07-14
AU2003288488A8 (en) 2004-07-14
IL153572A0 (en) 2004-02-08
WO2004057777A3 (fr) 2007-10-18

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