WO1998025411A1 - Systeme de communication terrestre - Google Patents

Systeme de communication terrestre Download PDF

Info

Publication number
WO1998025411A1
WO1998025411A1 PCT/SE1997/002012 SE9702012W WO9825411A1 WO 1998025411 A1 WO1998025411 A1 WO 1998025411A1 SE 9702012 W SE9702012 W SE 9702012W WO 9825411 A1 WO9825411 A1 WO 9825411A1
Authority
WO
WIPO (PCT)
Prior art keywords
lts
terrestrial
communication system
local
satellites
Prior art date
Application number
PCT/SE1997/002012
Other languages
English (en)
Other versions
WO1998025411A8 (fr
Inventor
Edvard Bjurfjell
Original Assignee
Wellton Persson, Claes, Lorentz, Uno
Svensson, Hans Erik,
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
Priority to EP97947244A priority Critical patent/EP0943208A1/fr
Priority to JP52551598A priority patent/JP2001508960A/ja
Priority to US09/308,657 priority patent/US6356737B1/en
Priority to AU52368/98A priority patent/AU729822B2/en
Priority to NZ336101A priority patent/NZ336101A/xx
Priority to HU0000579A priority patent/HUP0000579A3/hu
Priority to CA002273362A priority patent/CA2273362A1/fr
Priority to EEP199900216A priority patent/EE03721B1/xx
Application filed by Wellton Persson, Claes, Lorentz, Uno, Svensson, Hans Erik, filed Critical Wellton Persson, Claes, Lorentz, Uno
Priority to BR9713817-7A priority patent/BR9713817A/pt
Priority to IL13014797A priority patent/IL130147A0/xx
Publication of WO1998025411A1 publication Critical patent/WO1998025411A1/fr
Priority to NO992571A priority patent/NO992571D0/no
Priority to SE9901949A priority patent/SE519398C2/sv
Publication of WO1998025411A8 publication Critical patent/WO1998025411A8/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite

Definitions

  • the present invention relates to a terrestrial communication system, facilitating audio, video, data and any other type of communication within a local geographical area, and with an extremely large number of communication channels being made available simultaneously at a very low cost.
  • Audio, video and data communication are rapidly increasing sectors of interest, and existing terrestrial communication circuits, radio communication channels and satellite communication systems are used extensively.
  • Dedicated cable systems are also being used to cover local geographical areas with a large number of TV-channels, and these cable systems may also be used for data transmission purposes.
  • the present invention is based on the discovery that present satellite transmission techniques also can be used for terrestrial transmissions.
  • a user having equipment intended for reception of digital satellite signals can also use the very same equipment for reception of terrestrial transmissions.
  • LTS Local Terrestrial Satellites
  • Transmission from a LTS is based on one of the conventional standards for digital transmission as today used by conventional orbiting geostationary satellites, e.g. MPEG-2 or MPEG-1 or any other standard suitable for audio, video or data transmission purposes.
  • a preferred standard today is frequency modulated MPEG-2 (also compatible with MPEG-1) , but other known or future standards may also be used, and amplitude modulated (AM) transmission techniques can also be used as an alternative to frequency modulated (FM) transmission techniques.
  • AM amplitude modulated
  • Each LTS is transmitting using relatively low output power and with an antenna arrangement preferably having none or little directional effect.
  • a suitable number of LTS can be arranged to cover a local geographical area, giving the inhabitants access to individual communication channels for data, video (TV) and audio communication.
  • TV video
  • audio communication The advantages of such a system will be more fully discussed later.
  • the terrestrial communication system comprises at least one local terrestrial satellite (LTS) , preferably located in a mast or any other supporting structure, each LTS having high frequency communication equipment substantially corresponding to a conventional geostationary satellite for digital transmission of video, audio or data, arranged to transmit in the L Band (1 - 2 GHz) , the S Band (2 - 4 GHz) or a higher frequency band with a relatively low power output and having a preferably omnidirectional antenna installation for transmission in a substantially horizontal plane.
  • LTS local terrestrial satellite
  • Fig. 1 is a view from above diagrammatically showing a basic system according to the invention, including only one local terrestrial satellite (LTS) and two users of the system;
  • LTS local terrestrial satellite
  • Fig. 2 is a diagrammatically shown side view of a mast arranged to support two LTS at different heights;
  • Fig. 3 is a side view diagrammatically showing a system according to the present invention, which theoretically illustrates how a large number of LTS can be disposed in a circular arrangement;
  • Fig. 4 is a view from above of four LTS in a square arrangement, indicating the zone where users may communicate with any one of these four LTS;
  • Fig. 5 is a side view of a number of masts, each one supporting a LTS, intended to illustrate how the masts or any other supporting structure can be more closely located to each other;
  • Fig. 6 is a diagrammatically view from above, disclosing how a number of LTS may be linked together for internal communication.
  • the present invention is based on the discovery that present communication techniques used for digital satellite communication purposes also may be used for terrestrial communication purposes. This fact has not been realized previously, and consequently, all research efforts have been directed to the development of alternative techniques, facilitating digital transmission within the conventional TV-channel system.
  • communication equipment of the type presently used in modern earth orbiting communication satellites is arranged in a mast or any other suitable structure, thereby forming a local terrestrial satellite (LTS) .
  • the transponders are connected to an omnidirectional antenna system, and the parties using the system preferably utilize parabolic antennas which can be directed towards said omnidirectional antenna system.
  • a simple system of the above type is diagrammatically shown from above in Fig. 1, showing a LTS with a substantially circular and geographically restricted coverage, the border of which is denominated as 1, and a number of parabolic antennas 2 , 2 * , each being connected to equipment 3 , 3 ' of the type used for receiving and decoding digital signals of the same type as transmitted from conventional satellites.
  • the output from this type of equipment 3 , 3 * is advantageously fed to a computer and a video signal may be viewed on a monitor, TV-screen or any other means, with the audio signal converted into audio from a loudspeaker system.
  • same may be multi-directional, i.e. a computer with relevant equipment for reception/transmission of signals may receive and transmit signals from a computer to the LTS, and thus communicate either with other computers connected to the LTS or with other communication systems communicating with the LTS.
  • the above discussed system is a basic system, i.e. only one LTS is disclosed. However, the number of LTS within a local geographical area may be increased as desired, thereby increasing the number of communication channels substantially indefinitely.
  • a mast or other supporting structure This can be accomplished by arranging more than one LTS in a mast or other supporting structure, separated by a suitable vertical distance. This is shown diagrammatically in Fig. 2. Furthermore, such masts or supporting structures may also be arranged horizontally spaced from each other (as diagrammatically illustrated in Fig. 3) , and provided that a user has a suitable directional antenna installation, e.g. a parabolic antenna or a multi-beam directional antenna, the antennas connected to the transponders of utilized LTS only require to be spaced apart a few degrees in relation to the location of a user to reduce interference from adjacently located LTS to an acceptable level (with interference from an adjacent non- selected LTS substantially reduced to nil) .
  • a suitable directional antenna installation e.g. a parabolic antenna or a multi-beam directional antenna
  • Communication between transponders of utilized LTS and the users involves low output power transmission, typically an output power of 2 - 5 Watt is sufficient, even though increased output power also can be used.
  • High frequency band transmission is also used, preferably starting at the S Band range 2 - 4 GHz but ranging up to 400 GHz.
  • transmis- sion can also take place outside these limits, e.g. within the L Band (1 - 2 GHz) .
  • Low output power in combination with high frequency transmission makes it possible to restrict transmission to a prede- termined restricted local geographical area.
  • the area covered by a LTS can be modified as desired. Modifications to the antenna system can also be used, in particular if interference should occur between two or more LTS having different locations, whereby output in non-desired direction (s) can be reduced as an alternative to reduction in output power.
  • Each single LTS can transmit approximately 5.000 TV-programs of acceptable quality, and as a result, the system according to the present invention may simultaneously transmit 900.000 (180 x 5.000) different TV-programs within a local district, without interference problems. This number may actually be further increased, since the LTS may also be arranged alternating high-low in relation to the ground plane (as disclosed in Fig. 5) , whereby each point of location may be even closer than shown in Fig. 3.
  • the circular configuration of Fig. 3 can be replaced by any other configuration, and a further example is shown in Fig. 4.
  • parabolic dishes and satellite receivers with digital decoders can be used, provided that the frequencies of channels transmitted from the LTS fall within the same frequency range as used by present geostationary satellites.
  • TV programs transmitted via the system according to the present invention it is obviously possible to arrange a LTS used for TV transmission purposes connected to parabolic dishes and receiving equipment for programs transmitted from orbiting geostationary satellites, and retransmit these programs via the LTS.
  • a user would gain access to all these channels without the normally required large diameter dish antenna and the control system facilitating rotation of same in order to locate and receive signals from various geostationary satellites having in relation to each other different positions.
  • Pay channel programs can be requested by users of the system, and charged for the time viewed.
  • Another interesting feature with the system according to the present invention is the possibility of real "video on demand” .
  • the use of digital transmission techniques and "smart cards” has today made it possible to offer users of existing geostationary satellite systems the possibility to view certain programs on demand, e.g. movie films.
  • the present systems involve transmission of films at certain predetermined hours, and a user can call the operator by telephone, requesting one of the films running at such a starting time. A specific signal is sent to the user, whereby the decoder (or a smart card) is activated to decode the requested film as from the starting time until the end of same. The cost for viewing this particular film is billed to the user.
  • this can not be regarded as real video on demand, since the user is restricted to make a choice between a restricted number of films and the user must also accept predetermined starting hours.
  • video on demand can be offered which really meets any requirement by a user.
  • Any desired film can be ordered, e.g. by telephone, as well as any starting time.
  • the user receives information of the channel number to be used, e.g. 28F.
  • the operator has access to a video film library, e.g. by satellite communication, and may from any other part of the world obtain desired film, transferred in digitalized form at a high speed and stored by the operator on a suitable storage medium, e.g. a hard disc storage device.
  • a suitable storage medium e.g. a hard disc storage device.
  • a computer can thus, suitably equipped with transmitting and/or receiving equipment connected to an antenna system be arranged to communicate with a LTS.
  • a LTS For example, communication via Internet can be established facilitating high speed communication, and with speeds unavailable via telephone circuits.
  • the link from the LTS can be obtained via an earth orbiting geostationary satellite, cable, a LTS link system (to be discussed later) , or any other suitable method.
  • Such a computer may also be used as a TV receiver, or be linked to a separate monitor used as a TV screen.
  • the system according to the present invention may also be used with one or more of included LTS being part of a terrestrial link system.
  • a link can be established between same.
  • Said second LTS may be arranged in a manner similar to the first LTS in order to communicate with a third LTS, which in turn is equipped to communicate with a fourth LTS, and so on (Fig. 6) .
  • Local districts may thus be interconnected to each other and/or links can be established for long distance data, video or audio communication and/or communication with suitable centres giving access to communication cable networks or satellite communication or any other desired function.
  • the LTS for pure audio communication, i.e. a user may contact a LTS by means of a small transceiver in order to establish verbal contact with another user having similar communication equipment.
  • the LTS can also be connected to a public telephone network, whereby a user with equipment substantially similar to a cellular telephone can initiate or receive telephone calls.
  • LTS used in the system for terrestrial communication has not been described in detail, but comprises of the communication equipment as known to a person skilled in the art as suitable for a communication satellite in earth orbit, normally referred to as a geostationary satellite.
  • the antenna system is normally of omnidirectional type, but may, as mentioned earlier, also include antennas for certain purposes having a more or less directed lobe.
  • the equipment for reception of signals from a LTS includes preferably equipment similar to what is used for reception of signals from geostationary satellites using digital transmission techniques.
  • An advantage of the present system is that the directional dish antenna required can be made very small as compared to dishes used for reception of signals from geostationary satellites.
  • a preferred signalling technique is MPEG-2, but as stated earlier, any other known or future digital transmission technique can be used, including the earlier version of MPEG (MPEG-1) .
  • Frequency modulation (FM) is a preferred modulation technique, but amplitude modulation (AM) can also be used.
  • the system according to the present invention solves the problem of terrestrial transmission of digital video, audio and data signals.
  • Existing satellite receiving TV-sets may without additional equipment or modifications receive several thousands of TV-channels from one of the LTS included in the system.
  • Cable TV systems thus become obsolete, due to the low number of programs which can be transferred via cable, and also due to the initial costs for establishing a cable network. All problems with "shadows" (echoes) existing in conventional terrestrial TV systems are also avoided.
  • the system may be used for data communication purposes, whereby the communication speed is increased to speeds equivalent of a local area network (LAN) .
  • LAN local area network
  • the data system of the local administration can be accessed from schools, rescue service and other local services without the need for a local high speed cable system.
  • Local TV can be made available for all inhabitants at an extremely low cost.
  • Local systems may also serve as repeaters for TV programs transmitted from geostationary satellites or terrestrially transmitted TV programs, and local systems may also be linked together in a network.
  • IT information technology

Abstract

L'invention concerne un système de communication terrestre facilitant la transmission audio, vidéo, de données et tout type de communication à l'intérieur d'une zone géographique locale et avec un très grand nombre de canaux de communication rendus disponibles simultanément à un très faible coût. Ce système comprend au moins un satellite terrestre local (LST), de préférence implanté dans un mât ou une autre structure de support quelle qu'elle soit. Chaque LTS possède un équipement de communication haute fréquence correspondant sensiblement à un satellite géostationnaire conventionnel pour la transmission numérique audio, vidéo ou de données, agencé de manière à transmettre dans la bande L (1 à 2 GHz), la bande S (2 à 4 GHz) ou une bande de fréquence plus haute avec une puissance de sortie relativement faible. Chaque LTS possède également un dispositif d'antenne de préférence omnidirectionnelle pour la transmission dans un plan sensiblement horizontal. Les signaux peuvent être numérisés selon MPEG-2 ou selon n'importe quel algorithme connu ou futur pour la formation d'un signal.
PCT/SE1997/002012 1996-06-11 1997-12-01 Systeme de communication terrestre WO1998025411A1 (fr)

Priority Applications (12)

Application Number Priority Date Filing Date Title
CA002273362A CA2273362A1 (fr) 1996-06-11 1997-12-01 Systeme de communication terrestre
US09/308,657 US6356737B1 (en) 1996-12-01 1997-12-01 Terrestrial communication system using satellite transmission techniques
AU52368/98A AU729822B2 (en) 1996-06-11 1997-12-01 Terrestrial communication system
NZ336101A NZ336101A (en) 1996-06-11 1997-12-01 Terrestrial communication system
HU0000579A HUP0000579A3 (en) 1996-06-11 1997-12-01 Terrestrial communication system
EP97947244A EP0943208A1 (fr) 1996-06-11 1997-12-01 Systeme de communication terrestre
EEP199900216A EE03721B1 (et) 1996-06-11 1997-12-01 Maapealne sidesüsteem
JP52551598A JP2001508960A (ja) 1996-06-11 1997-12-01 地上通信システム
BR9713817-7A BR9713817A (pt) 1996-06-11 1997-12-01 Sistema de comunicação terrestre
IL13014797A IL130147A0 (en) 1996-06-11 1997-12-01 Terrestrial communication system
NO992571A NO992571D0 (no) 1997-12-01 1999-05-28 Markbundet kommunikasjonssystem
SE9901949A SE519398C2 (sv) 1997-12-01 1999-05-28 Markbundet kommunikationssystem

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9602302A SE9602302L (sv) 1996-06-11 1996-06-11 System för markbaserad satellit för markbaserad lokal sändning av TV, text-TV och data
SE9602302-3 1996-12-01

Publications (2)

Publication Number Publication Date
WO1998025411A1 true WO1998025411A1 (fr) 1998-06-11
WO1998025411A8 WO1998025411A8 (fr) 1999-10-21

Family

ID=20402959

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/002012 WO1998025411A1 (fr) 1996-06-11 1997-12-01 Systeme de communication terrestre

Country Status (16)

Country Link
EP (1) EP0943208A1 (fr)
JP (1) JP2001508960A (fr)
CN (1) CN1238887A (fr)
AU (1) AU729822B2 (fr)
BR (1) BR9713817A (fr)
CA (1) CA2273362A1 (fr)
CU (1) CU22647A3 (fr)
CZ (1) CZ186999A3 (fr)
EE (1) EE03721B1 (fr)
HU (1) HUP0000579A3 (fr)
IL (1) IL130147A0 (fr)
NZ (1) NZ336101A (fr)
SE (1) SE9602302L (fr)
TR (1) TR199901182T2 (fr)
TW (1) TW358279B (fr)
WO (1) WO1998025411A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20040172832A1 (en) * 2003-03-04 2004-09-09 Colin Clipstone Razor blade
KR101796199B1 (ko) 2016-12-20 2017-11-10 해성디에스 주식회사 온도 센서 패치 및 이를 포함하는 접착식 온도계

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995031070A2 (fr) * 1994-05-06 1995-11-16 Philips Electronics N.V. Systeme cellulaire point-multipoint de transmission televisuelle

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995031070A2 (fr) * 1994-05-06 1995-11-16 Philips Electronics N.V. Systeme cellulaire point-multipoint de transmission televisuelle

Also Published As

Publication number Publication date
CN1238887A (zh) 1999-12-15
HUP0000579A3 (en) 2000-09-28
EP0943208A1 (fr) 1999-09-22
CU22647A3 (es) 2000-12-22
AU5236898A (en) 1998-06-29
SE9602302L (sv) 1998-06-02
TW358279B (en) 1999-05-11
SE9602302D0 (sv) 1996-06-11
EE9900216A (et) 1999-12-15
IL130147A0 (en) 2000-06-01
BR9713817A (pt) 2000-03-14
EE03721B1 (et) 2002-04-15
NZ336101A (en) 2000-11-24
JP2001508960A (ja) 2001-07-03
WO1998025411A8 (fr) 1999-10-21
AU729822B2 (en) 2001-02-08
CZ186999A3 (cs) 1999-12-15
TR199901182T2 (xx) 1999-07-21
CA2273362A1 (fr) 1998-06-11
HUP0000579A2 (hu) 2000-06-28

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