WO1999023768A1 - Relais radioelectrique - Google Patents

Relais radioelectrique Download PDF

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Publication number
WO1999023768A1
WO1999023768A1 PCT/GB1998/003271 GB9803271W WO9923768A1 WO 1999023768 A1 WO1999023768 A1 WO 1999023768A1 GB 9803271 W GB9803271 W GB 9803271W WO 9923768 A1 WO9923768 A1 WO 9923768A1
Authority
WO
WIPO (PCT)
Prior art keywords
data
unit
radio
repeater
radio repeater
Prior art date
Application number
PCT/GB1998/003271
Other languages
English (en)
Inventor
Paul George Turner
Simon James Jones
Wycliffe Timothy Budgen Slingsby
Andrew Bateman
Paul Robert Clark
Original Assignee
Wireless Systems International Limited
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 Wireless Systems International Limited filed Critical Wireless Systems International Limited
Publication of WO1999023768A1 publication Critical patent/WO1999023768A1/fr

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
    • H04B7/155—Ground-based stations
    • H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
    • H04B7/15542—Selecting at relay station its transmit and receive resources
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
    • G01V1/22—Transmitting seismic signals to recording or processing apparatus
    • G01V1/223—Radioseismic systems

Definitions

  • the present invention relates to a radio repeater.
  • a radio repeater is suited for use in remote data acquisition systems, such as seismic data acquisition systems.
  • a seismic data collection system typically comprises an array of geophones.
  • the array may be spread over a large geographical area.
  • cabled interconnection between the geophones and a recording unit becomes impractical, and consequently radio links are employed instead.
  • a plurality of radio transmitters each associated with a respective geophone, or group of geophones are provided to transmit data back to a base station.
  • the radio frequencies employed are generally relatively high, for example 200MHz or more thereby restricting them to line of sight or near line of sight communication. This can present difficulties since the surface of the earth is, in general, not flat and the geophones may be located adjacent mountains or in valleys. Thus one or more of the radio transmitters may be obscured from line of sight communication with the base station. Such a transmitter is usually described as being "shadowed".
  • a radio repeater comprising first and second units arranged to communicate with each other via a data link, wherein the first unit comprises at least a radio receiver and the second unit comprises at least radio transmitter, such that signals received by the first unit are relayed to the second unit via the data link for retransmission. It is thus possible to provide a repeater unit which allows multiple remote " radio data transmission units which are badly shadowed to operate as though they have a direct link with the base station.
  • data link refers to a path or medium allowing information to be propagated in analogue or digital form.
  • the radio receiver in the first unit frequency converts the or each signal received from the or each remote data transmitter to one or more other frequencies for retransmission via the data link.
  • the incoming signals may be down converted to respective new frequencies.
  • each incoming signal may be demodulated to recover its base band signal.
  • the base band signal may then be processed for transmission over the data link. This may include the multiplexing of a plurality of base band signals over the data link. Standard multiplexing techniques, such as frequency division multiplexing or time division multiplexing may be used and need not be described here in detail.
  • the second unit converts the data received over the data link into a form suitable for the transmission to the base station.
  • the second unit may up convert each base band signal to a respective radio signal and then retransmit it.
  • the repeater is transparent to the data connection system apart from the possibility that the signals may be retransmitted on different frequencies.
  • the radio transmitter will retransmit the received radio signals at a different frequency to those received by the receiver in the first unit.
  • the first and second units may operate on a common frequency. Mutual interference can be reduced by using directional antennas, relying on shadowing between the units, or by signal processing techniques.
  • the first and second units are transceivers and the data link is bi-directional.
  • the radio repeater can also relay data or commands from the base unit to the remote data
  • the data link comprises one or more electrical cables and/or a wave guide, for example a fibre optic link, or radio or infra red links.
  • a wave guide for example a fibre optic link, or radio or infra red links.
  • a second unit includes at least one data input for receiving data from one or more sensors local to the second unit.
  • This additional data may be radio frequency modulated and transmitted to the base station in combination with the data received via the data link.
  • the first unit may include at least one data input for receiving data from one or more sensors local to the first unit. This additional data may be added to the data sent over the data link.
  • the second unit also comprises a data processor responsive to a receiver therein.
  • the second unit can recover control codes from signals transmitted by the base station.
  • the control codes contain information relating to the operation of the remote units and also the radio repeater.
  • An embodiment of the radio repeater provides bi-directional half-duplex communication.
  • the default mode of the repeater is that the second unit listens to the base station to receive a signal that instructs the remote units to send their data and also instructs the repeater to switch its operational mode so that it listens to the remote units and retransmits their signals back to the base station for a predetermined period of time before reverting to its default mode.
  • a repeater unit arranged to receive data on a data link and to retransmit it, the repeater further including at least one input for receiving additional data and means for adding that data to the data transmitted by the repeater unit.
  • Figure 1 is a schematic representation of a seismic data collection system, within a plurality of data collection units are shadowed from a base station;
  • Figure 2a to 2d schematically represent the frequency spectrums of a command channel down link, a repeated command channel down link, a seismic data up link, and a repeated seismic data up link, respectively.
  • a plurality of seismic arrays 2, 4 and 6 are connected to respective radio transmitters 8, 10 and 12.
  • the transmitters 8, 10 and 12 are arranged, in use. to transmit data to a base station 14.
  • an obstruction 16 prevents direct communication between the transmitters 8, 10, 12 and the base station 14.
  • the repeater comprises a first unit 20 in radio communication with the transmitters 8,10, and 12, and second unit 22 in radio communication with the base station 14.
  • both the first and second units 20 and 22 include radio transceivers.
  • the units 20 and 22 are connected together via a data link 24.
  • the data link 24 is a base band relay cable, such as a cable containing a plurality of electrically conducting wires although other data transmission media may be used.
  • the units 20 and 22 are arranged such that one unit acts as receiver whilst the other acts as a
  • the repeater supports half duplex bi-directional communication. This ensures that the shadowed remote units 8 to 12 can both send data to the base station and also receive commands from a command down link channel of the base station via the repeater.
  • the receiver and transmitter operate at different frequencies. However, since both operate concurrently, there is a danger of receiver desensitisation as the receiver's blocking performance may be exceeded by the proximity of a local transmitter operating at a different, but possibly nearby frequency. This problem is overcome by physically separating the first and second units (ie the receiver and transmitter) by a sufficient distance in order to ensure that the strong out-of-channel signal received from the transmitter has become sufficiently attenuated not to degrade the receiver's performance in respect of the in-channel signals received from the transmitters 8, 10 and 12.
  • the cable link 24 serves both to enable the units 22 and 20 to be positioned at respective locations such that each has good line of sight communication with the transmitters 8, 10 and 12, and the base station 14 respectively, and also serves to separate the units sufficiently such that cross talk between them is within acceptable levels.
  • directional antennas may be used to reduce the risk of receiver desensitisation. Thus a shorter cable may be used.
  • the second unit 22 also may include the facility to receive data from a local seismic sensor array 26 and to transmit this data to the base station.
  • Figures 2a to 2d schematically illustrate the frequency allocation in the system shown in figure 1.
  • the base station 14 can transmit command data to the radio transmitters 8, 10 and 12, and also to the or each repeater 18.
  • the control functions can include the allocation of repeater receive and transmit frequencies, switching between serving up links and down links, waking up or powering down repeaters and setting transmit power levels.
  • the command channel down link has a frequency spectrum centred around nominal centre frequency f d .
  • the second element 22 of the repeater is in line of sight communication with the base station 14 and receives the command channel data.
  • This data is then frequency down converted and transmitted at base band frequencies over the data cable 24 to the first unit 20 of the repeater.
  • the first unit 20 upconverts the command channel data to a repeated command channel down link having a frequency spectrum centred around nominal frequency f d '.
  • Additional repeaters may receive signals from and transmit signals to the first repeater 18 and are arranged to be responsive to the command channel at frequencies fa and f d '.
  • the transmitters of the seismic data array may include receiver elements also responsive to signals received on any one or more pre-allocated command channel frequencies including the frequencies f d and fd' .
  • Each of the transmitters 8, 10 and 12 associated with a seismic array is arranged to transmit on a respective frequency.
  • the six transmitters schematically illustrated in figure 1 (8,10,12, 30, 32 and 34) transmit on six closely spaced channels adjacent a notional seismic data up link frequency f u . These channels are frequency down converted by the first element 20 in order that they can be transmitted along the data link 24.
  • the signal transmitted along the data link comprises a plurality of closely spaced channels.
  • This can be regarded as frequency division multiplexed data transmission.
  • the second unit 22 receives the multiplexed signals and up converts them to a plurality of closely spaced channels centred around a repeated seismic data up link frequency f u ' as shown in figure 2d.
  • the data received from the local seismic array 26 is also up converted and in this example is retransmitted at the centre frequency f u ' with the additional repeated channels being allocated around the centre frequency.
  • each of the transmitters 8, 10, 12, 30, 32 and 34 operates on a respective channel, each located adjacent a centre frequency
  • the respective incoming channels can be frequency converted merely by mixing with a local oscillator. This allows multiple independent incoming channels to be easily and inexpensively converted to another frequency for transmission over the data link 24, and similarly, frequency mixing can again be used to up convert the incoming data for retransmission to a base station or transmission to a further repeater.
  • the unit 22 also demodulates any signal received from the base station in order to check for command signals sent from the base station, the repeater operates in half-duplex mode and consequently the repeater is arranged, primarily, to listen to the base station in order to receive commands therefrom.
  • the base station When the base station is ready to receive information, it sends a command code to each of the remote units instructing them to transmit data, and also instructs the repeater to change operation so that it listens to the remote units and retransmits to the base station until the end of a predetermined period, when it reverts to listening to the base station. It is thus possible to provide a frequency translating radio repeater for use in a remote data acquisition network.

Landscapes

  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Acoustics & Sound (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Geophysics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Relay Systems (AREA)

Abstract

Ce relais comporte une première et une seconde unité (20, 22). La première unité est conçue pour recevoir des signaux émanant d'unités éloignées d'acquisition de données (8, 10, 12) et envoyer l'information relative sur une liaison de transmission de données (24) à la seconde unité (22) aux fins d'une retransmission à la station de base (14). Les unités du relais sont également à même d'accepter des données provenant de capteurs locaux (26) aux fins d'une insertion dans les données relayées.
PCT/GB1998/003271 1997-11-03 1998-11-03 Relais radioelectrique WO1999023768A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9723186.4 1997-11-03
GB9723186A GB2330985A (en) 1997-11-03 1997-11-03 A radio repeater comprising two transceivers connected by a data link

Publications (1)

Publication Number Publication Date
WO1999023768A1 true WO1999023768A1 (fr) 1999-05-14

Family

ID=10821492

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/003271 WO1999023768A1 (fr) 1997-11-03 1998-11-03 Relais radioelectrique

Country Status (3)

Country Link
FR (1) FR2770706A1 (fr)
GB (1) GB2330985A (fr)
WO (1) WO1999023768A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111751869A (zh) * 2019-03-29 2020-10-09 中国石油天然气集团有限公司 地震勘探数据转发方法、中继器、相关设备及传输系统

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB9819737D0 (en) * 1998-09-10 1998-11-04 Taylor Lann Technology Limited Communication system
EP1198777A4 (fr) * 1999-05-24 2005-06-22 Input Output Inc Systeme d'acquisition sismique commande a distance
WO2005069249A1 (fr) * 2004-01-12 2005-07-28 Behzad Barjasteh Mohebbi Amplificateur cellulaire a faible portee
JP4459738B2 (ja) * 2004-07-05 2010-04-28 株式会社エヌ・ティ・ティ・ドコモ 中継装置、通信装置および指向性制御方法
GB2424544B (en) * 2005-03-23 2008-05-21 Toshiba Res Europ Ltd Wireless relay
CN101839995B (zh) * 2009-03-18 2011-12-07 中国石油天然气集团公司 一种地震数据长距离传输方法及系统
US8086174B2 (en) 2009-04-10 2011-12-27 Nextivity, Inc. Short-range cellular booster
WO2013056511A1 (fr) * 2011-10-17 2013-04-25 中国科学院地质与地球物理研究所 Sismomètre numérique tout-en-un câblé, sans fil et sans câble

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2260467A (en) * 1991-09-12 1993-04-14 Blick Communications Ltd Repeater
GB2266028A (en) * 1992-03-31 1993-10-13 Usw Pcn Inc Active two-way radio repeater
WO1997029556A1 (fr) * 1996-02-07 1997-08-14 Lutron Electronics, Co., Inc. Repeteur de systeme de transmission pour commander et determiner a distance l'etat de dispositifs electriques

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US4607389A (en) * 1984-02-03 1986-08-19 Amoco Corporation Communication system for transmitting an electrical signal
FR2599533B1 (fr) * 1986-05-30 1988-11-04 Inst Francais Du Petrole Systeme de transmission de signaux sismiques utilisant des radiorelais
FI108382B (fi) * 1993-05-27 2002-01-15 Sonera Oyj Laitteisto ja menetelmõ tiedon siirtõmiseksi
ES2113814B1 (es) * 1993-07-30 1998-11-01 Int Multi Media Corp Sistema de comunicacion sub-orbital de gran altitud.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2260467A (en) * 1991-09-12 1993-04-14 Blick Communications Ltd Repeater
GB2266028A (en) * 1992-03-31 1993-10-13 Usw Pcn Inc Active two-way radio repeater
WO1997029556A1 (fr) * 1996-02-07 1997-08-14 Lutron Electronics, Co., Inc. Repeteur de systeme de transmission pour commander et determiner a distance l'etat de dispositifs electriques

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NAOKI FUJIMOTO ET AL: "A NEW 4 GHZ 52 MB/S DIGITAL RADIO-RELAY SYSTEM", NTT REVIEW, vol. 3, no. 1, 1 January 1991 (1991-01-01), pages 75 - 80, XP000223900 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111751869A (zh) * 2019-03-29 2020-10-09 中国石油天然气集团有限公司 地震勘探数据转发方法、中继器、相关设备及传输系统

Also Published As

Publication number Publication date
GB9723186D0 (en) 1998-01-07
GB2330985A (en) 1999-05-05
FR2770706A1 (fr) 1999-05-07

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