EP0030895B1 - Procédé de correction de la défocalisation transversale d'un paraboloide et dispositif correspondant de correction d'antenne parabolique - Google Patents

Procédé de correction de la défocalisation transversale d'un paraboloide et dispositif correspondant de correction d'antenne parabolique Download PDF

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Publication number
EP0030895B1
EP0030895B1 EP80401778A EP80401778A EP0030895B1 EP 0030895 B1 EP0030895 B1 EP 0030895B1 EP 80401778 A EP80401778 A EP 80401778A EP 80401778 A EP80401778 A EP 80401778A EP 0030895 B1 EP0030895 B1 EP 0030895B1
Authority
EP
European Patent Office
Prior art keywords
paraboloid
platform
defocusing
source
articulated
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.)
Expired
Application number
EP80401778A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0030895A1 (fr
Inventor
Bernard Hubert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Airbus Group SAS
Original Assignee
Airbus Group SAS
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 Airbus Group SAS filed Critical Airbus Group SAS
Priority to AT80401778T priority Critical patent/ATE5285T1/de
Publication of EP0030895A1 publication Critical patent/EP0030895A1/fr
Application granted granted Critical
Publication of EP0030895B1 publication Critical patent/EP0030895B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/18—Means for stabilising antennas on an unstable platform
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/125—Means for positioning
    • H01Q1/1264—Adjusting different parts or elements of an aerial unit

Definitions

  • the orientation of a beam of satellite dishes and a satellite dish in general can be obtained in different ways.
  • the assembly When the source is rigidly linked to the paraboloid, the assembly can be pivoted around the reference axes.
  • This solution is commonly used on surveillance radars for example.
  • this satellite is roughly stabilized on the orientation axis while a fine pointing system brings the focus of the dish in the intended direction.
  • the antenna is linked to a platform that can be oriented relative to the satellite and the orientation device essentially consists of a particular electromagnetic system which has the advantage of eliminating friction generating disturbing torques and which has been described in another European patent application of the Applicant EP-A-0 015 829 entitled "Electromagnetic method for adjusting the orientation of a platform”.
  • the source-paraboloid assembly can be symbolically represented by a truncated pyramid with a triangular (or square) base in which the fixed source would be at the top of said pyramid and the director of the paraboloid perpendicular to the plane of the truncated part; the base being for its part subject to a fixed part.
  • the truncated part being linked to this base by axially deformable elements oriented along the edges, it is possible to obtain, by rotation of the connection points, a displacement of the sides of said truncated part which then takes place substantially in the plane of the lateral faces of said pyramid thus bringing a minimum difference between the focus and the source.
  • the invention proposes a method for correcting the transverse defocusing of a paraboloid which does not have any of the drawbacks described above.
  • the paraboloid is supported on a first platform articulated transversely according to a deformable trapezoid and said first platform is itself articulated orthogonally on a second platform articulated according to a deformable trapezium linked to the fixed base.
  • the paraboloid 1 is linked by the frame 3 to the source S of the horn 2 located at the focal point F and the director Z is oriented by pivoting of the body 4 around the axes XX 'and / or YY'.
  • the dish is linked by the frame 3 'to the source S of the horn 2' located at the focal point F and the director Z is oriented by pivoting of the ball 5 around the axes XX 'and / or YY' .
  • phase center is in S, the direction SO making with OZ an angle 0, it follows a phase variation ⁇ (y) on the aperture AB which causes a deviation of the beam ... and an asymmetry in the radiation pattern ..., an important secondary lobe appears on the side opposite the deviation (coma lobe).
  • the body 4 "of the satellite is oriented along OZ by its own attitude correction means while the pointing which, according to OZ, is obtained using appropriate means by correction around axes XX 'and / or YY' according to the articulation point 0 located at 6, which shows the above-mentioned transverse defocus defect.
  • the invention proposes a method for correcting the transverse defocusing of a parabolic antenna which does not have the aforementioned drawbacks.
  • the focal point F of the paraboloid is maintained in the immediate vicinity of the source S by the fact that the point 0 is moved transversely to the pointing axis SZ, using a device shown diagrammatically on the FIG. 4 and the principle of which is set out in FIG. 5 or as a variant in FIGS. 6 and 7.
  • the paraboloid 10 with a focal point F centered in S is connected by a pylon 9 to a first platform 18 in a trapezoid articulated around the axes XX ′ according to A, B, C and D of FIG. 5.
  • the sides AB and CD are arranged at rest in the direction of the confused points F and S.
  • the first platform is articulated on a second trapezoid platform 19 articulated on the base 12 around the axes Y - Y 'along A, B, C and D, FIG. 5.
  • the sides AB and CD are also arranged at rest in the direction of the confused points F and S.
  • the rotation of the straight line BC around the point F is obtained by deformation of the articulated trapezium ABCD and this deformation A ⁇ B '.
  • C'D makes it possible to combine rotation and translation of the line BC so that the displacements of the point F on the perpendicular bisector of BC remain very small during the movement.
  • this point F will move in F 'by a quantity d ⁇ k ⁇ 2 , that is to say by a 2nd order term in ⁇ if, of course, AB and DC initially converge all two towards this point F.
  • Figures 5 and 6 show the cases where BC and AD are initially parallel.
  • electromagnetic devices can be of the type such as those described in the aforementioned patent application EP-A-0015829, identified 16-17 in FIG. 4 and shown on a larger scale in FIG. 8 and for which the operating principle is recalled below.
  • Each platform 18 or 19 therefore carries a flat winding situated in its plane and the strands of which are in the direction of movement.
  • These coils 21 and 22 are connected to a servo unit 23 connected to a deflection detector 7 (not shown).
  • each winding sees the direction of current flow established according to, for example, the arrows in FIG. 8.
  • Each coil is overlapped by a pair of magnets 24-25, of reverse polarity, which are fixed to the fixed base 12 by a support 26.
  • the arrangement of the magnets and the coils can be reversed without changing the result.
  • each platform 18 or 19 will therefore move in the magnetic field in the direction of arrows f1 or f2 with more or less amplitude and this in accordance with the law of LAPLACE .
  • the source of emission and / or reception is, according to the known manner, a horn in waveguide 8 with progressively increasing section, secured to the fixed base.
  • the paraboloid constitutes the reflector of a parabolic antenna which can be implemented, through the invention, in all the fields where it is usually used from the moment when the source S is not subject to the director passing through foyer F.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Aerials With Secondary Devices (AREA)
  • Mounting And Adjusting Of Optical Elements (AREA)
  • Details Of Aerials (AREA)
EP80401778A 1979-12-18 1980-12-11 Procédé de correction de la défocalisation transversale d'un paraboloide et dispositif correspondant de correction d'antenne parabolique Expired EP0030895B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80401778T ATE5285T1 (de) 1979-12-18 1980-12-11 Verfahren zur korrektur der querentfokussierung einer parabolantenne und vorrichtung zur korrektur einer parabolantenne.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7930957A FR2472284A1 (fr) 1979-12-18 1979-12-18 Procede de correction de la defocalisation transversale d'un paraboloide et dispositif correspondant de correction d'antenne parabolique
FR7930957 1979-12-18

Publications (2)

Publication Number Publication Date
EP0030895A1 EP0030895A1 (fr) 1981-06-24
EP0030895B1 true EP0030895B1 (fr) 1983-11-09

Family

ID=9232882

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80401778A Expired EP0030895B1 (fr) 1979-12-18 1980-12-11 Procédé de correction de la défocalisation transversale d'un paraboloide et dispositif correspondant de correction d'antenne parabolique

Country Status (7)

Country Link
US (1) US4365252A (show.php)
EP (1) EP0030895B1 (show.php)
JP (1) JPS5694805A (show.php)
AT (1) ATE5285T1 (show.php)
CA (1) CA1156754A (show.php)
DE (1) DE3065561D1 (show.php)
FR (1) FR2472284A1 (show.php)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2502404A1 (fr) * 1981-03-20 1982-09-24 Matra Dispositif de montage articule, notamment d'un sous-ensemble de satellite artificiel
FR2523375A1 (fr) * 1982-03-10 1983-09-16 Europ Agence Spatiale Dispositif de compensation des distorsions des reflecteurs pour antennes de reception et/ou transmission d'ondes a faisceaux multiples
FR2543697B1 (fr) * 1983-03-30 1985-08-23 Aerospatiale Procede et dispositif de suspension et d'entrainement d'un miroir oscillant de telescope spatial
DE9014875U1 (de) * 1990-10-27 1991-01-10 Kabelmetal Electro Gmbh, 30179 Hannover Antenne mit einem parabolischen Reflektor
US7118658B2 (en) * 2002-05-21 2006-10-10 Semitool, Inc. Electroplating reactor
TW202306722A (zh) 2021-02-22 2023-02-16 美商外世界股份有限公司 具有機械臂波導的基於微波的採礦系統及方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0015829A1 (fr) * 1979-02-28 1980-09-17 AEROSPATIALE Société Nationale Industrielle Procédé électromagnétique pour régler l'orientation d'une plate-forme et plate-forme mettant en oeuvre ce procédé

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB905440A (en) * 1957-12-18 1962-09-05 Gen Electric Co Ltd Improvements in or relating to position control arrangements and aerial systems including such arrangements
US3166750A (en) * 1961-02-14 1965-01-19 Raytheon Co Antenna intersecting-orthogonal-axes gimbal mount utilizing rotary bearings for two axes and push-pull linkage for third axis
US3262321A (en) * 1963-09-16 1966-07-26 Jr George E Moul Two-rod seeker head
DE1273625B (de) * 1964-04-03 1968-07-25 Boelkow Gmbh Nachrichten-Satellit mit einem Richtfunksystem und mit einer Konfiguration in Form einer Hantel
US3374977A (en) * 1966-06-09 1968-03-26 Collins Radio Co Antenna positioner
US3565515A (en) * 1967-12-12 1971-02-23 Perkin Elmer Corp Mounts for optical elements
JPS5028148B1 (show.php) * 1969-11-28 1975-09-12

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0015829A1 (fr) * 1979-02-28 1980-09-17 AEROSPATIALE Société Nationale Industrielle Procédé électromagnétique pour régler l'orientation d'une plate-forme et plate-forme mettant en oeuvre ce procédé

Also Published As

Publication number Publication date
EP0030895A1 (fr) 1981-06-24
DE3065561D1 (en) 1983-12-15
CA1156754A (en) 1983-11-08
ATE5285T1 (de) 1983-11-15
FR2472284A1 (fr) 1981-06-26
JPS5694805A (en) 1981-07-31
JPH0136282B2 (show.php) 1989-07-31
US4365252A (en) 1982-12-21
FR2472284B1 (show.php) 1981-12-24

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