WO2000003494A2 - Terminal de reseau satellitaire - Google Patents

Terminal de reseau satellitaire Download PDF

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Publication number
WO2000003494A2
WO2000003494A2 PCT/US1999/015579 US9915579W WO0003494A2 WO 2000003494 A2 WO2000003494 A2 WO 2000003494A2 US 9915579 W US9915579 W US 9915579W WO 0003494 A2 WO0003494 A2 WO 0003494A2
Authority
WO
WIPO (PCT)
Prior art keywords
signal
output
digital
band
modulated
Prior art date
Application number
PCT/US1999/015579
Other languages
English (en)
Other versions
WO2000003494A3 (fr
WO2000003494A8 (fr
WO2000003494A9 (fr
Inventor
Ken Schuerman
James Meiss
Mark Webber
Original Assignee
Act Wireless
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 Act Wireless filed Critical Act Wireless
Priority to AU49814/99A priority Critical patent/AU4981499A/en
Publication of WO2000003494A2 publication Critical patent/WO2000003494A2/fr
Publication of WO2000003494A8 publication Critical patent/WO2000003494A8/fr
Publication of WO2000003494A9 publication Critical patent/WO2000003494A9/fr
Publication of WO2000003494A3 publication Critical patent/WO2000003494A3/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
    • H04B7/1851—Systems using a satellite or space-based relay
    • H04B7/18517—Transmission equipment in earth 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
    • H04B7/18578—Satellite systems for providing broadband data service to individual earth stations
    • H04B7/18597—Arrangements for system physical machines management, i.e. for construction, operations control, administration, maintenance

Definitions

  • This invention relates to satellite network terminals.
  • Signals received at a satellite network terminal are conventionally coupled from a feed horn at a satellite dish antenna, to an antenna transceiver (i.e. outdoor unit), to a signal up/down converter, to a modulator/demodulator for interpretation and routing.
  • the modulator/demodulator is coupled to frame relay network equipment such as a frame relay receiver-filter and a frame re- lay switch.
  • the feed horn is located at or near the focus of a dish antenna for the satellite net- work terminal, and is coupled to the antenna transceiver using a cable.
  • the feed horn at the satellite dish antenna is disposed to receive and output signals modulated on a carrier in a first known frequency range such as C-band (about 1 1.7 to about 12.2 gigahertz) or Ku-band (about 14 to about 14.5 gigahertz).
  • the antenna trans- ceiver is disposed to receive those signals and output signals modulated on a carrier in a second frequency range such as L-band (about 950 to about 1450 megahertz).
  • the signal up/down con- verter is disposed to receive those signals and output signals modulated on a carrier in a third known frequency range (about 70 megahertz ⁇ 18 megahertz, or alternatively about 140 mega- hertz ⁇ 36 megahertz).
  • a first problem known in the art is that the antenna transceiver and up/down con- verter are complex and expensive; it would be desirable to be able to modulate and demodulate the satellite signal directly between the feed horn at the satellite dish antenna and the modula- tor/demodulator. This would reduce required signal filtering. It would also greatly simplify, and reduce the expense of, producing the transmitted satellite signal. 1
  • a second problem known in the art is that the feed horn at the satellite dish an-
  • the invention provides a method and system for simplified signal processing be- 7 tween the feed horn and the frame relay equipment. Data is directly modulated from the frame 8 relay equipment onto an L-band carrier and block up-converted for output at the feed horn. 9 Block up-conversion is aided by adding a DC power signal and a 10 megahertz frequency refer-
  • NCO oscillator
  • a noise floor for the NCO is set so that the output signal is clipped at the desired output frequency; this increases the signal/noise ratio at that desired output frequency.
  • Figure 1A shows a block diagram of a system for simplified signal processing between a satellite antenna and a set of frame relay equipment.
  • Figure IB shows a diagram of a transmit reject filter, ortho mode transducer, and feed horn assembly.
  • Figure 2A shows a block diagram of a modulator and down converter coupled to a block up-converter.
  • Figure 2B shows a block diagram of a down converter including a commercial tuner module, a triplexer, a frequency reference, and a DC power supply.
  • FIG. 2C shows a block diagram of a block up converter (BUC).
  • FIG. 2D shows a block diagram of a low noise block down converter (LNB).
  • LNB low noise block down converter
  • Figure 2E shows a block diagram of a modulator including a modulator element, a DC power supply, a frequency reference, and a triplexer.
  • Figure 3 shows a block diagram of the modulator synthesizer including the gen- eration of an approximately 10.7 megahertz synthesizer frequency reference. This synthesizer generates the modulator L-Band carrier signal.
  • Figure 4 shows a triplex function element for combining an L-band modulated signal, a DC power signal, and a frequency reference signal.
  • Figure 1A shows a block diagram of a system for simplified signal processing between a satellite antenna and a set of frame relay equipment.
  • a system 100 includes a satellite dish antenna 1 10, including a parabolic dish re- flector 11 1 and a feed hom 112.
  • the feed horn 112 is disposed to receive and to transmit signals at a first set of " known satellite transmission frequencies, such as those in C-band or Ku-band.
  • Feed horns 1 12 for use with satellite dish antennas 1 10 are known in the art of satellite commu- nication.
  • An exemplar of a feed horn assembly including the feed horn, the mounts for the BUC (block up converter), LNB (low-noise block converter) and the transmit reject filter and the OMT (ortho mode transducer) is shown in Figure IB.
  • the feed hom 1 12 is coupled to an antenna transceiver 113, which is disposed to couple signals to and from the feed horn 112 at a second set of known frequencies, such as those in L-band.
  • the outdoor unit or antenna transceiver includes everything except the feed horn (i.e. the BUC, LNB, OMT and the transmit or Tx reject filter).
  • the antenna transceiver 1 13 is coupled to a hybrid modem including a modulator and down converter 120, which is disposed to couple signals to and from the antenna transceiver 1 13 at L-band frequencies.
  • the modulator and down converter 120 is coupled to a set of frame relay network equipment 130, which is disposed to transmit, receive and filter, and switch frames in a frame relay system.
  • the frame relay network equipment 130 includes the SkyframeTM 800-EM product, available from ACT Networks, Inc., of Camarillo, California.
  • the SkyframeTM 800-EM product preferably includes a plurality of digital frame receiver/filters, such as the SkyframeTM DEF-01 product, also available from ACT Networks, Inc., of Camarillo, Cali- fomia, and at least one modulator/demodulator card, such as the SkyframeTM MOS-01-EM prod- uct, also available from ACT Networks, Inc., of Camarillo, California.
  • the modulator and down converter 120 is disposed to receive signals modulated on L-band frequencies, and to down convert those signals to a 70-megahertz carrier, to provide signals in the 70 megahertz ⁇ 18 megahertz frequency range. Operation of the modulator and down converter 120 in this regard is further described with reference to figures 2 A and 2B.
  • the modulator and down converter 120 is also disposed to receive digital data from the frame relay network equipment 130, and to directly modulate that data onto L-band fre- quencies.
  • a 70 megahertz demodulator is included in the modulator and down con-
  • Modulator and Down Converter Figure 2 A shows a block diagram of a modulator and down converter coupled to a
  • the modulator and down converter 120 includes a modulator 210 and a down converter 220.
  • the modulator 210 (L-band modulator) is coupled
  • the modulator is configured to control the frame relay network equipment 130 so as to receive digital data therefrom.
  • the modulator is configured to control the frame relay network equipment 130 so as to receive digital data therefrom.
  • BUC block up converter
  • the down converter 220 is coupled to the frame relay network equipment 130 so
  • the down converter 220 is also cou-
  • LNB low-noise block convener
  • the demodulator 200 is coupled to the frame relay equipment 130 to transmit digital data thereto. Additionally, the demodulator 200 is coupled to the down convener 220 to receive signals using a 70 megahertz carrier as shown in Figure 2A.
  • Figure 2B shows a block diagram of the elements of the down converter 220.
  • FIG. 2 A the BUC 230 is coupled to an OMT (ortho mode trans- ducer) 250, so as to transmit signals to the feed horn 1 12.
  • Figure 2C shows a block diagram of the elements of the block up converter (BUC).
  • the LNB 240 is coupled to a transmit-reject element 260, which is coupled to the OMT 250, so as to receive signals from the feed hom 1 12.
  • Figure 2D shows a block diagram of the elements of the low noise block down converter (LNB).
  • the transmit-reject element 260 is disposed to filter out frequency components of signals transmitted by the BUC 230 to the OMT 250, and to transmit signals received by the feed horn 1 12 to the LNB 240 for processing Operation of transmit-reject elements 260 is known in the an of satel- lite communication.
  • the OMT 250 is coupled to the feed horn 1 12, so as to transmit and receive sig- nals to and from the feed horn 112. Coupling between the OMT 250 and the feed hom 1 12 is known in the art of satellite communication.
  • the modulator 210 includes an input port 21 1 , a modulator element 212 coupled to the input port 21 1 , a DC power supply 223, a frequency reference 224, a triplex function element 225, and an output port 226.
  • the input port 21 1 is coupled to the frame relay network equipment 130, and is
  • the modulator element 212 modulates incoming digital data from the frame relay network equipment 130 onto an L-band carrier frequency, to provide a modulated signal in the L-band frequency range.
  • the modulator element 212 is " coupled to the triplex function element 225.
  • the modulator element 212 includes an L-band reference frequency synthesizer element 213 and a quadrature modulator element 214.
  • the modulator element 212 processes the incoming digital data from the frame relay network equipment 130, generates two quadrature signals (that is, I and Q data streams) and modulates those I and Q data streams onto the L-band reference frequency carrier in quadrature.
  • the quadrature modulator element 214 includes an RF2422 circuit, available from R.F. Microdevices, of Greensboro, NC. Quadrature modulation is known in the art of signal processing.
  • the DC power supply 223 provides a constant DC power signal, and is coupled to the triplex function element 225.
  • the frequency reference 224 provides a constant 10.0 megahertz reference sine wave, and is coupled to the triplex function element 225.
  • the triplex function element 225 combines the output of the modulator element
  • the BUC 230 includes a signal separator element 231, a phase-locked multiplier element 232, a mixer 233, and an amplifier 234.
  • the signal separator element 231 is disposed for coupling to the modulator element 212, using a high-quality signal transmission cable to pre- vent signal degradation.
  • the signal separator element 231 isolates the 10.0 megahertz reference sine wave and provides that reference frequency to the carrier synthesizer element 232.
  • the sig- nal separator element 231 isolates the DC power and provides that power as required throughout the BUC 230.
  • the carrier synthesizer element 232 is coupled to the 10.0-megahertz reference sine wave and provides an output carrier signal to mixer 233.
  • the output carrier signal is about 14.0 to 14.5 gigahertz (for Ku-band).
  • Carrier synthesizers are known in the art of signal processing.
  • the signal separator element 231 also isolates the L-band modulated digital data and provides that signal to the mixer 233.
  • the mixer 233 translates the L-Band modulated car- rier to a Ku-band carrier frequency for transmission.
  • Mixers are known in the art of signal proc- essing.
  • the amplifier 234 is coupled to the mixer 233, to receive the modulated Ku-band signal and to amplify it by about 50 decibels, for coupling to the feed hom 1 12 and transmission by the satellite dish antenna 1 10.
  • Amplifiers are known in the art of signal processing.
  • Modulating Digital Data onto an L-Band Carrier Figure 3 shows a means for providing a numerically controlled 10.7-megahertz ⁇
  • This sine wave is used as the reference input to a single loop
  • the frequency reference 224 includes a first frequency reference 310(part of 224),
  • the PLL 360 includes a phase detector 361 , a loop filter 362, a VCO (voltage controlled oscillator) 363, and a programmable frequency divider 364, cou- pled in a feedback configuration as shown in the figure.
  • the first frequency reference 310 includes a 40-megahertz sine wave signal.
  • a temperature controlled quartz crystal oscillator generates this signal. Crystal oscillators are known in the art of signal processing.
  • the NCO 320 is coupled to an output of the first frequency reference 310, and includes a digital input port 321, so as to receive a 32-bit digital value specifying the frequency multiplier the NCO 320 applies to its input.
  • the frequency multiplier is less than one, so that the
  • output signal from the NCO 320 and the DAC 330 comprises a 10.7-megahertz + 7.5 kHz sine
  • the NCO 320 and the DAC 330 are embodied in a single circuit, such as the AD9830 product, available from Analog Devices Corporation of Nor- wood MA. Numerically controlled oscillators and digital to analog converters are known in the art of signal processing.
  • the DAC 330 is coupled to an output of the NCO 320, and is disposed to convert a digital signal output from the NCO 320 to an analog signal.
  • the DAC 330 includes a resistor 331 coupled to adjust the output level of the DAC 330.
  • the resistor 331 is set so as to cause the 10.7-megahertz component of the output signal to clip at the maxi- mum amplitude reachable by the DAC 330. This causes the signal-to-noise ratio of the DAC 330 to be maximized for the 10.7-megahertz component of the output signal.
  • the band-pass filter 340 is coupled to an output of the DAC 330.
  • the band-pass filter 340 is coupled to an output of the DAC 330.
  • filter 340 has a center frequency of 10.7-megahertz and a 3-decibel roll-off loss for a ⁇ 7.5 kilo-
  • band-pass filters are known in the art of signal processing, as is the design of band-pass filters with selected roll-off loss.
  • the band-pass filters are known in the art of signal processing, as is the design of band-pass filters with selected roll-off loss.
  • pass filter 340 imposes about an 80-decibel loss for frequencies greater than ⁇ 40 kilohertz de-
  • the frequency divider 350 is coupled to an output of the band-pass filter 340.
  • the frequency divider 350 divides the signal output by the band-pass filter 340 (intended to be a sub-
  • the PLL 360 includes a digital input port 365 and an output port 366.
  • the PLL 360 includes a digital input port 365 and an output port 366.
  • the 360 includes the phase detector 361 , the loop filter 362, the VCO 363, and the programmable frequency divider 364, coupled in a feedback configuration.
  • the digital input port 365 receives a digital value specifying the frequency divider the PLL 360 applies to its input signal.
  • the pro- grammable frequency divider 364 is responsive to the input signal so as to divide a signal ap- pearing at the output port 366 and couple a resultant to the phase detector 361 .
  • phase-locked loops are known in the art of signal proc-
  • the attenuator / amplifier 367 is coupled to the output po ⁇ 366 of the PLL.
  • Attenuator / amplifier combination is coupled to the low pass filter 370.
  • the signal output from the PLL 360 in- eludes extraneous components at two times the desired output frequency.
  • the low-pass filter 370 removes these extraneous components.
  • Figure 4 shows a triplex function element for combining an L-band modulated
  • the triplex function element 225 includes a signal input port 410, a high-pass fil- ter 420, a reference input port 430, a band-pass filter 440, a power input port 450, a low pass fil- ter, a first summing element 460, a second summing element 470, and an output port 480.
  • the signal input port 410 is disposed for coupling to an incoming L-band signal, which includes digital data that has been modulated onto a carrier in the L-band frequency range of about 950 megahertz to about 1450 megahertz.
  • the signal input port 410 is coupled to the high-pass filter 420. which prevents frequency components of the other two inputs 430 and 450 from feeding back into the L-Band signal path.
  • the reference input port 430 is disposed for coupling to an incoming reference signal at 10.0 megahertz.
  • the reference input port 430 is coupled to the band-pass filter 440, which removes frequency components other than the desired reference frequency component at 10.0 megahertz, and prevents frequency components from the other two inputs 410 and 450 from feeding back into the 10.0 megahenz signal path.
  • the power input port 450 is disposed for coupling to DC power signal, for exa - pie +24 V.
  • the power input port is coupled to the low pass filter which remove unwanted fre-
  • the band-pass filter 440 and the low pass filter are coupled to the first summing element 460, which includes a set of first filter elements 461 and a first summing node 462, to sum the reference frequency component at 10.0 megahenz with the DC power signal.
  • the high-pass filter 420 and the first summing element 460 are coupled to
  • the second summing element 470 which includes a set of second filter elements 471 and a sec- ond summing node 472, to sum the L-band modulated digital data with the signal provided by the first summing element 460.
  • the second summing element 470 is coupled to the output port 480, to provide an output which is the sum of the three inputs: (1 ) the L-band modulated digital data, (2) the 10.0 megahertz reference frequency component, and (3) the DC power signal.

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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)
  • Radio Relay Systems (AREA)
  • Transceivers (AREA)

Abstract

L'invention concerne un procédé et un système permettant de simplifier le traitement des signaux entre l'ensemble formant cornet d'alimentation et les systèmes de relais de trames. Les données sont directement modulées à partir des systèmes de relais de trames sur un support de bandes L et converties à une fréquence supérieure en vue de leur sortie au niveau du cornet d'alimentation. Cette conversion est facilitée par l'addition d'un signal de puissance en courant continu et d'un signal de référence d'une fréquence de 10,0 MHz au signal modulé de la bande L (de manière à protéger la référence de fréquences contre toute variation due aux éléments externes) tout en conservant la pureté spectrale du signal modulé de la bande L.
PCT/US1999/015579 1998-07-09 1999-07-09 Terminal de reseau satellitaire WO2000003494A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU49814/99A AU4981499A (en) 1998-07-09 1999-07-09 Satellite network terminal

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11261098A 1998-07-09 1998-07-09
US09/112,610 1998-07-09

Publications (4)

Publication Number Publication Date
WO2000003494A2 true WO2000003494A2 (fr) 2000-01-20
WO2000003494A8 WO2000003494A8 (fr) 2000-03-23
WO2000003494A9 WO2000003494A9 (fr) 2000-06-08
WO2000003494A3 WO2000003494A3 (fr) 2000-07-13

Family

ID=22344866

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/015579 WO2000003494A2 (fr) 1998-07-09 1999-07-09 Terminal de reseau satellitaire

Country Status (2)

Country Link
AU (1) AU4981499A (fr)
WO (1) WO2000003494A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1363412A1 (fr) * 2002-05-17 2003-11-19 Agilis Communication Tech. Pty. Ltd. Emetteur-récepteur hybride de radiofréquence
FR2844651A1 (fr) * 2002-09-16 2004-03-19 Thomson Licensing Sa Dispositif d'emission destine a etre couple avec un dispositif de reception
WO2005029719A2 (fr) * 2003-09-18 2005-03-31 Thomson Licensing Terminal utilisateur bi-directionnel de large diffusion à fréquences d'émission configurables

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5559809A (en) * 1994-09-27 1996-09-24 Electronics And Telecommunications Research Institute Transmit block up-converter for very small aperture terminal remote station
EP0820159A2 (fr) * 1996-07-17 1998-01-21 General Electric Company Système de communication par satellites utilisant un codage concatené parallèle
WO1998016024A1 (fr) * 1996-10-10 1998-04-16 Skydata Corporation Terminal d'acces aux services integres de gestion de connexions sur demande, destine a un systeme de communications par satellite
US5774788A (en) * 1995-03-17 1998-06-30 Hughes Electronics Remote ground terminal having an outdoor unit with a frequency-multiplier

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5559809A (en) * 1994-09-27 1996-09-24 Electronics And Telecommunications Research Institute Transmit block up-converter for very small aperture terminal remote station
US5774788A (en) * 1995-03-17 1998-06-30 Hughes Electronics Remote ground terminal having an outdoor unit with a frequency-multiplier
EP0820159A2 (fr) * 1996-07-17 1998-01-21 General Electric Company Système de communication par satellites utilisant un codage concatené parallèle
WO1998016024A1 (fr) * 1996-10-10 1998-04-16 Skydata Corporation Terminal d'acces aux services integres de gestion de connexions sur demande, destine a un systeme de communications par satellite

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1363412A1 (fr) * 2002-05-17 2003-11-19 Agilis Communication Tech. Pty. Ltd. Emetteur-récepteur hybride de radiofréquence
FR2844651A1 (fr) * 2002-09-16 2004-03-19 Thomson Licensing Sa Dispositif d'emission destine a etre couple avec un dispositif de reception
WO2004025845A2 (fr) * 2002-09-16 2004-03-25 Thomson Licensing Sa Dispositif d'emission destine a etre couple a un dispositif de reception
WO2004025845A3 (fr) * 2002-09-16 2004-08-26 Thomson Licensing Sa Dispositif d'emission destine a etre couple a un dispositif de reception
WO2005029719A2 (fr) * 2003-09-18 2005-03-31 Thomson Licensing Terminal utilisateur bi-directionnel de large diffusion à fréquences d'émission configurables
WO2005029719A3 (fr) * 2003-09-18 2005-06-02 Thomson Licensing Sa Terminal utilisateur bi-directionnel de large diffusion à fréquences d'émission configurables
US7697888B2 (en) 2003-09-18 2010-04-13 Thomson Licensing Broad distribution bi-directional user terminal at configurable broadcast frequencies

Also Published As

Publication number Publication date
AU4981499A (en) 2000-02-01
WO2000003494A3 (fr) 2000-07-13
WO2000003494A8 (fr) 2000-03-23
WO2000003494A9 (fr) 2000-06-08

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