EP0482987A1 - Kompaktes Visiergerät mit grossem Betrachtungswinkel für optoelektronische Ausrüstung zur Lokalisierung und Erfassung eines Ziels - Google Patents

Kompaktes Visiergerät mit grossem Betrachtungswinkel für optoelektronische Ausrüstung zur Lokalisierung und Erfassung eines Ziels Download PDF

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Publication number
EP0482987A1
EP0482987A1 EP91402785A EP91402785A EP0482987A1 EP 0482987 A1 EP0482987 A1 EP 0482987A1 EP 91402785 A EP91402785 A EP 91402785A EP 91402785 A EP91402785 A EP 91402785A EP 0482987 A1 EP0482987 A1 EP 0482987A1
Authority
EP
European Patent Office
Prior art keywords
elevation
deposit
sight
assembly
equipment
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
Application number
EP91402785A
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English (en)
French (fr)
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EP0482987B1 (de
Inventor
Olivier Dez
Vincent Vilbois
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0482987A1 publication Critical patent/EP0482987A1/de
Application granted granted Critical
Publication of EP0482987B1 publication Critical patent/EP0482987B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41G—WEAPON SIGHTS; AIMING
    • F41G3/00—Aiming or laying means
    • F41G3/06—Aiming or laying means with rangefinder
    • F41G3/065—Structural association of sighting-devices with laser telemeters

Definitions

  • the invention relates to the field of optronic equipment on board an aircraft, in particular intended for three-dimensional localization and / or the acquisition of targets for example, and more particularly to a compact aiming device with large angular movement for a such equipment.
  • An installation of the optronic equipment under the airplane does not allow the orientation of the line of sight towards the positive elevation angles with respect to the horizontal reference of the airplane fuselage.
  • a lateral implantation would present an important mask, in deposit, due to the presence of the nose, unless using two systems placed symmetrically, which then significantly increases the cost.
  • the main devices for orienting the line of sight mounted on currently existing devices generally do not allow a large angular movement of the line of sight, or else when the angular movement is almost suitable, the device creates a large concealment for the visibility of the pilot and disturbances harmful to stability and piloting due to aerodynamic drag.
  • the subject of the invention is a device for optronic on-board location and acquisition equipment, which allows access to large angular deflections of the line of sight, in particular a deflection in unlimited field, while freeing the visibility of the pilot. and limiting the aerodynamic effects.
  • the proposed device is compact, in the sense that it makes it possible to limit the volume external to the skin of the aircraft, and has an external structure which can rotate freely along the bearing axis.
  • the invention provides a compact aiming device with large angular movement for optronic location and acquisition equipment comprising an optomechanical set of orientation in elevation and in line of sight, an entry porthole crossed by the incident beam useful and mirrors forming an optical image transfer assembly, characterized in that the optomechanical assembly comprises a deposit structure forming the envelope of the sighting device which can rotate 360 ° bearing on bearings and a site structure mounted on the deposit structure using two bearings arranged on either side of the optical assembly of offset, and in that the entry porthole has a generally rectangular shape in two dimensions and covers the field in elevation over 90 ° in positive and at least 20 ° in negative relative to the horizontal reference of the fuselage in a first dimension and has a reduced width at the entrance pupil according to the second dimension.
  • the device for orienting the line of sight is located in the plane of symmetry of the aircraft.
  • the principle adopted is the use of a Poggendorf mirror M (called 1 ⁇ 2), that is to say that the line of sight rotates by 2 ⁇ when a mirror undergoes a rotation of ⁇ .
  • a Poggendorf mirror M so that the line of sight rotates by 2 ⁇ when a mirror undergoes a rotation of ⁇ .
  • Such a device does not allow the orientation of the line of sight LV towards elevated angles in elevation relative to the horizontal reference of the RHF fuselage, due to the principle adopted and the limited size of the mirror.
  • the low visibility of the pilot is very obscured in the axis since the system is arranged in the plane of symmetry of the aircraft.
  • the principle used is the same, rotation of a mirror M equal to half of the viewing angle relative to the RHF, but the device for orienting the line of sight comprises a lens at the head to reduce the beam diameter at the level of the mirror M.
  • This device is more complex than the previous one, because the angle of rotation of the head lens is equal to twice that of the mirror M, the 2 axes of rotation being confused.
  • the same limitation occurs with regard to the orientation of the line of sight towards very high elevation angles, and the concealment of the low visibility of the pilot still exists.
  • a third type of device shown in Figure 3 also mounted laterally, the concealment of the low line of sight is of the same order; on the other hand the accessible angular range is more important because the system provides for a coupling of axes making it possible to orient the line of sight at the same time in elevation and in bearing.
  • Such a device consists of a sphere S rotating around a fixed point C which is the center of the sphere and which is the intersection of the two axes of rotation.
  • Such a device makes it possible to obtain smaller external dimensions, but has a major drawback for monitoring, because if it is easy to position the various elements of the device to obtain a line of sight in a given direction, a control of the whole to get a continuous scan is much more difficult.
  • the line of sight accesses a large angular range to perform either a pursuit or a target search by exploration of a large volume around the aircraft according to a scanning law; on the other hand, the servos of the line of sight along the axes site and deposit are planned to be fully decoupled; finally, the proposed site / deposit optomechanical architecture allows the sighting device to occupy only a small volume, with a spherical entry porthole of very simplified construction.
  • the sighting device 1 is shown in Figures 4a and 4b according to two orthogonal sections, Figure 4a being in the plane of symmetry of the aircraft.
  • This device comprises a deposit structure 2 which forms the envelope of the device 1, a spherical part of this envelope emerging from the skin of the aircraft.
  • This structure 2 rotates around the Y′0Y bearing axis over 360 °, bearing on the frame of the aircraft thanks to the bearings R1 and R2 arranged between this frame and a cylindrical part of the structure 2; the deposit structure 2 supports image transfer mirrors M2, M3 and M4.
  • a site structure 3 defines the site angle of the line of sight around a site axis X′OX orthogonal to the axis of deposit Y′0Y; for this purpose, two rolling bearings A and B ensure the rotation of the site structure 3 independently of the deposit structure 2; the site structure 3 supports the deflection mirror M1 from the line of sight towards the site axis X′OX.
  • the sighting device 1 also includes a spherical porthole 10 mounted in the reservoir structure 2; the large dimension of this window covers the field in site (see Figure 4b) over 90 ° in positive site and at least 20 ° in negative site compared to RHF; the small dimension or width of the window is reduced to the dimension of the entrance pupil (widened to the instantaneous field of observation in cone of the equipment).
  • This configuration makes it possible to limit the dimensions of the window without limiting the angular movement.
  • the optical equipment is completed by an afocal optical assembly composed of two groups, a front group, symbolized by the input lens 11, and a rear group, symbolized by the output lens 12, the lens 11 being secured to the site structure 3 and the lens 12 secured to the reservoir structure 2.
  • the useful incident beam defined by the entrance pupil and oriented along the line of sight, crosses the entrance window 10, is focused by the lens 11, after reflection on the mirrors M1 and M2, in a plane located between mirrors M2 and M3 to form an intermediate image there, and is returned along the bearing axis thanks to mirrors M3 and M4 to reform a collimated beam on this axis through group 12, the latter forming an afocal arrangement with group 11; the collimated beam is then focused in a detection plane.
  • an afocal assembly for example with converging-converging dioptres, makes it possible to have a beam of reduced diameter, in particular at the level of the mirrors M2 and M3. This makes it possible to reduce the dimensions of the return mirrors M1 to M4, in particular of the mirrors M2 and M3 situated before and after the plane of formation of the intermediate image.
  • the site structure 2 has an opening ⁇ because the rolling bearing B is located behind the mirror M2.
  • the seal between the mobile part in the deposit and the fixed frame, at the level of the bearing R1 can be ensured by polytetrafluoroethylene seals (more commonly known under the trade name "TEFLON") loaded.
  • TEFLON polytetrafluoroethylene seals
  • the friction torque may prove to be too great for this type of joint; it is therefore more advantageous in terms of performance to adapt a ferrofluid type seal.
  • the window in order to no longer be exposed to the aerodynamic flow, can be turned 180 ° along the bearing axis so as to be protected, for example rain-erosion, when crossing hostile areas; the opening of the site structure can be used to embed a diaphragm and / or a collecting lens so as to improve the quality of the image formed in the detection plane; for safety reasons, the window can be doubled.
  • thermokinetic heating In order to completely avoid sealing problems, it can also be envisaged to use a fixed spherical porthole, of suitable dimensions; but, in this case, most of the advantages of the mobile structure disappear, in particular the reduced size of the window and the variable stopping point of the incident aerodynamic flow, a fixed stopping point causing localized thermokinetic heating.

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Telescopes (AREA)
EP19910402785 1990-10-26 1991-10-18 Kompaktes Visiergerät mit grossem Betrachtungswinkel für optoelektronische Ausrüstung zur Lokalisierung und Erfassung eines Ziels Expired - Lifetime EP0482987B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9013278 1990-10-26
FR9013278A FR2668614B1 (fr) 1990-10-26 1990-10-26 Dispositif de visee compact a grand debattement angulaire pour equipement optronique de localisation et d'acquisition de cible.

Publications (2)

Publication Number Publication Date
EP0482987A1 true EP0482987A1 (de) 1992-04-29
EP0482987B1 EP0482987B1 (de) 1995-04-12

Family

ID=9401583

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910402785 Expired - Lifetime EP0482987B1 (de) 1990-10-26 1991-10-18 Kompaktes Visiergerät mit grossem Betrachtungswinkel für optoelektronische Ausrüstung zur Lokalisierung und Erfassung eines Ziels

Country Status (3)

Country Link
EP (1) EP0482987B1 (de)
DE (1) DE69108845T2 (de)
FR (1) FR2668614B1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4331259C1 (de) * 1993-09-15 2003-07-10 Bodenseewerk Geraetetech Sucher für zielverfolgende Flugkörper

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1452061A (fr) * 1965-05-12 1966-02-25 Coupole de forme sphérique pour instruments d'observation spatiale ou astronomique
EP0167432A1 (de) * 1984-06-06 1986-01-08 Thomson-Csf Luftfahrzeuggerät für optoelektrische Entdeckung, Ortung und allseitige Vervolgung eines Zieles
US4900117A (en) * 1989-02-21 1990-02-13 Chen Linus T Rotary optical coupler utilizing cylindrical ringshaped mirrors and method of making same

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1452061A (fr) * 1965-05-12 1966-02-25 Coupole de forme sphérique pour instruments d'observation spatiale ou astronomique
EP0167432A1 (de) * 1984-06-06 1986-01-08 Thomson-Csf Luftfahrzeuggerät für optoelektrische Entdeckung, Ortung und allseitige Vervolgung eines Zieles
US4900117A (en) * 1989-02-21 1990-02-13 Chen Linus T Rotary optical coupler utilizing cylindrical ringshaped mirrors and method of making same

Also Published As

Publication number Publication date
DE69108845D1 (de) 1995-05-18
DE69108845T2 (de) 1995-09-14
FR2668614B1 (fr) 1993-10-29
EP0482987B1 (de) 1995-04-12
FR2668614A1 (fr) 1992-04-30

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