EP2380235A1 - Système d'émission de faisceaux électromagnétiques à réseau d'antennes. - Google Patents
Système d'émission de faisceaux électromagnétiques à réseau d'antennes.Info
- Publication number
- EP2380235A1 EP2380235A1 EP10701005A EP10701005A EP2380235A1 EP 2380235 A1 EP2380235 A1 EP 2380235A1 EP 10701005 A EP10701005 A EP 10701005A EP 10701005 A EP10701005 A EP 10701005A EP 2380235 A1 EP2380235 A1 EP 2380235A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- support
- elements
- network
- sensors
- field
- 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.)
- Granted
Links
- 230000005284 excitation Effects 0.000 claims abstract description 29
- 238000004364 calculation method Methods 0.000 claims abstract description 13
- 238000005259 measurement Methods 0.000 claims abstract description 13
- 238000012937 correction Methods 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims description 23
- 230000005855 radiation Effects 0.000 claims description 10
- 230000010363 phase shift Effects 0.000 claims description 5
- 125000006850 spacer group Chemical group 0.000 claims description 3
- 238000000790 scattering method Methods 0.000 claims 1
- 238000005286 illumination Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000004422 calculation algorithm Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 239000012482 calibration solution Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/267—Phased-array testing or checking devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
- H01Q1/288—Satellite antennas
Definitions
- the invention relates to a large-sized transmitting and / or receiving antennal system comprising an array of radiating elements.
- the field of application of the invention is satellite antennas, radar antennas, aircraft antennas, generally ground or embedded antennas integrating networks of radiating elements.
- the radiating elements of the network antenna are powered by electromagnetic signals previously numerically weighted in phase and amplitude by excitation coefficients determined by calculation means.
- the electromagnetic signals received by the elements of the network antenna are then numerically weighted in phase and amplitude by excitation coefficients determined by these same calculation means.
- excitation coefficients are used in reception to transform the signals received by the elements of the network antenna and coming from one or more directions into a useful coherent signal, and into transmission to transform a useful signal into different signals supplying the elements. of the network and constituting one or more given illumination beams, in both cases to respect a certain law of illumination desired for the network.
- DBFN Digital Beamforming Network
- a satellite in orbit may be subject to sudden changes in temperature depending on whether it is illuminated by the sun or not. This results in deformations of the antenna due to the existence of significant thermal gradients.
- the antenna can be subjected to significant thermal and mechanical stresses resulting in deformations of the latter. These deformations disturb the law of illumination of the elements of the network.
- the calibration functions of network elements are generally performed using couplers inserted in the transmission circuit to take a part of the signal sent to the transmitting elements.
- Another calibration solution is to perform remote measurements.
- measurements are taken from a ground station.
- An object of the invention is to overcome these disadvantages by providing a network antenna system that allows as much as possible to respect a desired illumination law and radiation pattern.
- a first object of the invention is an electromagnetic beam emission system, comprising an array of far-field electromagnetic beam emission elements, the signals coming from and / or arriving at each of the elements being weighted by coefficients. excitation means determined numerically by calculation means, characterized in that the system comprises:
- a second distinct array of sensors arranged close to the array of radiating elements in order to measure the existing near field radiated by the elements; means for calculating the far field radiated by the network from the near field actually measured by the sensors;
- the law of illumination of the network is controlled in real time from local measurements of the near field radiated by the latter, thus allowing rapid reconfiguration of the beams.
- the system thus comprises on-board control means making it possible to check the radiation pattern of the network antenna in real time. This allows adjustment and compensation in real time of the radiation pattern of the antenna in case of deformation of the network or failure of one or more elements of the network. In real time, the emission or reception radiation diagrams of the antenna are corrected by varying the values of the excitation coefficients of each element of the network.
- the system makes it possible to take into account the mechanical and thermal deformations that the antenna could undergo, and which can be significant in the Ku-band or Ka-band wavelength for a satellite in orbit, for example.
- the radiating elements of the network are fixed to a first support
- the second sensor array being fixed to a second support separate from the first support
- the first support and the second support being fixed to a common base with a space between the first support and the second support allowing deformation of the first support.
- the first support comprises a support plate in common with the radiating elements of the network, and there is provided a second support for each sensor, this support for each sensor comprising a holding rod; one end of which is fixed to the sensor and whose other end is fixed to a base, to which the first support is also fixed by means of spacers, the plate having holes for the crossing of the rods with the said space present between the edge of the hole and the stem.
- the sensors are positioned in the free space and distributed above the plane of the array of radiating elements.
- the height between the sensors and the radiating elements of the network is greater than a fraction of the working wavelength of the elements.
- the excitation coefficients comprise a phase shift and an amplitude
- the system comprises, for each element of the network, an associated reception channel and / or an associated transmission channel, the calculation means being designed to calculate the phase shift adjustments of the coefficients; excitation and amplitude adjustments of the excitation coefficients so that the radiation pattern measured from the sensors is as close as possible to a radiation pattern of a setpoint.
- the system comprises means for addressing the sensors to collect the near-field measurement locally at the location of each sensor using the modulated scattering technique for example.
- FIG. 1 represents a modular block diagram of an example of an antenna transmission and reception system according to the invention
- FIG. 2 represents a modular block diagram of a regulation part of the antenna system according to FIG. 1,
- FIG. 3 represents a side view of an exemplary part of the network of elements of the antenna system according to FIG. 1;
- FIG. 4 represents a view from above of another example of a portion of the network of elements of the antennal system according to Figure 1.
- the invention is described below in the example of a satellite network antenna, responsible for retransmitting to the earth a signal received from a terrestrial base station.
- the transmission and reception system 1 comprises an array 2 of a plurality of radiating elements 2i, 2 2 ,..., I 1 ,... 2 N.
- This network 2 is for example arranged on a plane.
- Each element I 1 is for example in the form of a horn or printed element having an opening oriented towards a direction DIR common to all the antennas I 1 .
- the antenna network 2 is connected to a computer 3 via one side of a reception circuit 4 and on the other hand by a transmission circuit 5.
- the separation between the reception and transmission channels is achieved by means of a set 7 of frequency diplexers placed near the radiating elements.
- the reception circuit 4 comprises a reception channel 4i for processing each signal S 1 received on each antenna I 1 and bringing it to an input 6i of the computer 3.
- the processing of each reception channel 4i comprises, as is known , a frequency diplexing stage 7, a low noise amplification stage 8, a variable gain amplification stage 9, a baseband passing stage 10 and an analog / digital conversion stage 110.
- the transmission circuit 5 comprises a transmission channel 5i for each element
- each transmission channel 5i comprises, as is known, a digital / analog conversion stage 12, a carrier frequency passing stage 13, a distribution stage 14 through Buttler matrices, an amplification stage, a filtering stage 16, a stage 17 of recombination through Buttler matrices and a stage 18 of frequency diplexing.
- the computer 3 comprises means 30a for calculating the complex excitation coefficients of the antennas I 1 in reception and means 30b for calculating the complex excitation coefficients of the antennas I 1 in transmission.
- the excitation coefficients Ki and Lk make it possible, respectively, to reconstruct, from the signals S 1 received by the antennas I 1 , a useful coherent signal S, and to send back this useful signal S in the form of the signal s'k to each transmission path 5k forming the desired transmission beams.
- the excitation coefficients Ki and Lk provide a gain and a phase shift, that is to say a complex multiplying factor or a complex weighting, respectively to each reception channel 4i with respect to the other reception channels 4i, and to each 5k transmission channel compared to other 5k transmission channels.
- the complex values of the coefficients Ki in reception are optimized and calculated numerically by the computing means 35 of the computer 3 to maximize the coherent signal from the sum weighted by the coefficients Ki of the signals S 1 received.
- the means 35 of the calculation means 30a produce, as a function of the reception signals S 1 of the antennas I 1, a signal S equal to the weighted sum of the signals S 1 by the excitation coefficients K i according to the equation:
- the network 2 of radiating elements 2 l5 of the sensors 10i, 1O 2, ..., 10 ,,. . . 10 M measuring the near field radiated by the elements 2 15 M may be different from N and being generally greater than the number N of elements I 1 .
- the network of the sensors 10 is connected by means 11 for addressing, collection and reception to the computing means 30b of the computer 3.
- the calculation means 30b of complex coefficients transmit excitation Lk are represented in Figure 2.
- the calculation means 30b comprises a module 31 for determining the excitation coefficients Lk from the near field Epj measured by the sensors 10 j .
- Each sensor 10 j is used to measure the near field Epj radiated by the network
- the module 32 calculates the existing far field El from the measured near field Ep j by the sensors 10 j .
- the module 32 has, for example, advanced far field calculation algorithms from near-planar field data, prerecorded value tables of the radiation pattern of the sensors 10 j and the elements I 1 and / or others. pre-recorded correspondence rules, a memory being provided for this purpose.
- a comparator 33 compares this calculated existing elongated field E1 with a predetermined distance field predetermined and pre-recorded EIc, for example in a module 34.
- the comparator 33 thus calculates an error signal Err in the far field as a function of the difference between the field El calculated remote distance and the far setpoint field EIc.
- the calculation module 31 determines, by means of advanced optimization algorithms, the excitation coefficients Lk of the elements I 1 from this error signal Err in the far field.
- the signal S is sent from the module 35 of the part 30a when it is provided or from a signal generator S to be sent to the calculation module 31.
- the module 31 modifies the radiated field in emission by the elements I 1 , which will be measured again by the sensors 10.
- the far field radiated by the elements I 1 is optimized by playing on the coefficients Lk to get closer to the ideal field EIc or be equal to it.
- the far field radiated by the elements I 1 is thus regulated to approach or be equal to the ideal far field EIc.
- the system could only work in transmission.
- the index i refers to the elements used in reception, less than or equal to the number N of elements of the network 2
- k refers to the elements used in transmission, less than or equal to the number N of elements of the network 2.
- the system does not function as a satellite transponder, but mainly in transmission, as for example for a radar, in which the signal is emitted, we receive an echo signal which is processed separately, then the signal S comes from a signal generator and block 30a becomes a digital signal source s.
- the plurality of radiating elements I 1 symbolized by two lines in FIG. 3, is fixed to the same first support 20, while the plurality of sensors 10 j is fixed to another second support 100, which is different. of the first support 20.
- the first support 20 is for example formed by a single flat plate. It is for example provided a second support 100 for each sensor 10.
- This support 100 is for example formed by a holding rod whose one end is fixed to the sensor 10 j and whose other end is fixed to a base 40 and stable rigid which can be the platform of the satellite, to which the first support 20 is also fixed via spacers 21.
- the sensors 10 j are positioned in the free space in front of the plane of the array of radiating elements I 1 , for example being located in the same geometrical plane parallel to the plane in which the elements I 1 of the network 2 are arranged.
- the height H between the sensors 10 and the elements I 1 is for example greater than one fifth of the working wavelength ⁇ of the elements I 1 .
- FIG. 3 shows that the sensors 10 t are provided alongside and between elements I 1 .
- the plate forming the first support 20 has holes 23 for the passage of the second supports 100 in.
- each second support 100 passes through a hole 23 of the plate forming the first support 20 with the space 22 present between the edge of the hole 23 and the support 100.
- the space 22 thus allows a clearance between the support 20 and the support 20. support 100.
- This clearance enabled by the spaces 22 allows the first support 20 to deform to a certain extent because of thermal or mechanical stresses, for example.
- the deformation of the support 20 will be taken into account by the sensors 10 j because these sensors 10 j will measure the near field Epj radiated by the elements I 1 . Therefore, this deformation can be corrected in real time. It will therefore be possible to impose much less stringent requirements on the first support 20 and to accept to a certain extent a deformation thereof, which will lighten this support 20 and the means 21 of connection to the base 40.
- FIG. 4 shows that a plurality of sensors 10 j can be provided around and between each radiating element I 1 , such as for example 6 in number by elements I 1 in the hexagonal configuration represented.
- a sensor 10 j may be provided above each element I 1 , as is also shown in FIG. 4.
- the support 100 of the sensor 10 situated above the element I 1 crosses both the first support 20 as this element I 1 .
- the sensors 10 are very discrete due to their small size and because they do not disturb the field radiated by the array antenna 2. Modulated scattering techniques can be applied to the sensors 10 to locally measure the near field radiated by the network antenna 2.
- FIG. 1 shows an embodiment of a sensor system 10 using the modulated scattering technique to carry out measurements of the near-field Epj locally at the location of the sensors.
- the system comprises a bus Hj for addressing the sensors 10 j from the computer 3 and another channel 19 for collecting the near-field measurements Epj from the sensors to a measurement reception module 36.
- the signal the address sent by the computer 3 on the bus 1 Ij is modulated for this sensor Hj, with for example a different modulation from one sensor to another to identify the responses of the sensors to this modulation on the collection path 19.
- the measurement signal Epj collected by the module 36 on the collection channel 19 and having the modulation sent to the sensor Hj will be the one supplied by this sensor Hj.
- the module 36 will provide the various near-field measurements Epj by means 30b.
- the sensors 10 may be calibrated by receiving a far-field calibration signal in the DIR direction, for example from the ground for a satellite. This calibration can be periodic, for example once a month or a week or other.
- a terrestrial base station illuminates the satellite in a plane wave.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Aviation & Aerospace Engineering (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0950320A FR2941333B1 (fr) | 2009-01-20 | 2009-01-20 | Systeme d'emission de faisceaux electromagnetiques a reseau d'antennes. |
PCT/EP2010/050583 WO2010084116A1 (fr) | 2009-01-20 | 2010-01-19 | Système d'émission de faisceaux électromagnétiques à réseau d'antennes. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2380235A1 true EP2380235A1 (fr) | 2011-10-26 |
EP2380235B1 EP2380235B1 (fr) | 2012-09-19 |
Family
ID=40910763
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10701005A Active EP2380235B1 (fr) | 2009-01-20 | 2010-01-19 | Système d'émission de faisceaux électromagnétiques à réseau d'antennes. |
Country Status (6)
Country | Link |
---|---|
US (1) | US8681046B2 (fr) |
EP (1) | EP2380235B1 (fr) |
JP (1) | JP5479493B2 (fr) |
ES (1) | ES2396021T3 (fr) |
FR (1) | FR2941333B1 (fr) |
WO (1) | WO2010084116A1 (fr) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2941333B1 (fr) * | 2009-01-20 | 2012-12-14 | Satimo Sa | Systeme d'emission de faisceaux electromagnetiques a reseau d'antennes. |
CN102791730A (zh) | 2010-01-22 | 2012-11-21 | 诺沃—诺迪斯克有限公司 | 低度o-糖基化的fgf21的制备方法 |
WO2013058842A1 (fr) * | 2011-06-29 | 2013-04-25 | Technology Service Corporation | Systèmes et procédés de simulation de cible en champ proche |
CN104145371B (zh) | 2012-01-24 | 2016-08-24 | 康普技术有限责任公司 | 多元件天线校准技术 |
US9322864B2 (en) | 2012-10-01 | 2016-04-26 | Ets-Lindgren, Lp | Methods and apparatus for evaluating radiated performance of MIMO wireless devices in three dimensions |
DE102017114822A1 (de) * | 2017-07-04 | 2019-01-10 | Dfs Deutsche Flugsicherung Gmbh | Verfahren zur Untersuchung von Antennen mit mindestens einer Messsonde |
FR3106240B1 (fr) * | 2020-01-14 | 2022-06-17 | Commissariat Energie Atomique | Système antennaire à rayonnement contrôlé |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2597268B1 (fr) | 1986-04-11 | 1988-06-24 | Centre Nat Rech Scient | Procede et dispositif de focalisation, sur un point a examiner, des antennes d'un reseau |
JPH07183842A (ja) * | 1993-12-22 | 1995-07-21 | Toshiba Corp | 衛星通信/放送システム |
JP2972668B2 (ja) * | 1997-08-26 | 1999-11-08 | 日本電気電波機器エンジニアリング株式会社 | フェーズドアレイ空中線のモニタ方式 |
US6304214B1 (en) * | 1999-05-07 | 2001-10-16 | Lucent Technologies Inc. | Antenna array system having coherent and noncoherent reception characteristics |
US6084545A (en) * | 1999-07-12 | 2000-07-04 | Lockheed Martin Corporation | Near-field calibration system for phase-array antennas |
US6163296A (en) * | 1999-07-12 | 2000-12-19 | Lockheed Martin Corp. | Calibration and integrated beam control/conditioning system for phased-array antennas |
SE522564C2 (sv) * | 2000-02-01 | 2004-02-17 | Ericsson Telefon Ab L M | Gruppantennkalibrering |
WO2004025321A1 (fr) * | 2002-09-11 | 2004-03-25 | Lockheed Martin Corporation | Etalonnage du codage de circuit de commande avec un reseau de sondes d'etalonnage imbrique a l'antenne reseau |
DE102005011128B4 (de) * | 2005-03-10 | 2011-12-29 | Imst Gmbh | Kalibrierung einer elektronischen steuerbaren Planarantenne und elektronisch steuerbare Antenne mit einer Messsonde im reaktiven Nahfeld |
FR2941333B1 (fr) * | 2009-01-20 | 2012-12-14 | Satimo Sa | Systeme d'emission de faisceaux electromagnetiques a reseau d'antennes. |
-
2009
- 2009-01-20 FR FR0950320A patent/FR2941333B1/fr not_active Expired - Fee Related
-
2010
- 2010-01-19 US US13/145,400 patent/US8681046B2/en active Active
- 2010-01-19 ES ES10701005T patent/ES2396021T3/es active Active
- 2010-01-19 WO PCT/EP2010/050583 patent/WO2010084116A1/fr active Application Filing
- 2010-01-19 EP EP10701005A patent/EP2380235B1/fr active Active
- 2010-01-19 JP JP2011545765A patent/JP5479493B2/ja active Active
Non-Patent Citations (1)
Title |
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See references of WO2010084116A1 * |
Also Published As
Publication number | Publication date |
---|---|
JP2012515674A (ja) | 2012-07-12 |
WO2010084116A1 (fr) | 2010-07-29 |
FR2941333A1 (fr) | 2010-07-23 |
EP2380235B1 (fr) | 2012-09-19 |
US20110279320A1 (en) | 2011-11-17 |
FR2941333B1 (fr) | 2012-12-14 |
ES2396021T3 (es) | 2013-02-18 |
US8681046B2 (en) | 2014-03-25 |
JP5479493B2 (ja) | 2014-04-23 |
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