EP0952424B1 - Dispositif de microgouverne pour la correction de trajectoire de munition stabilisée par rotation - Google Patents
Dispositif de microgouverne pour la correction de trajectoire de munition stabilisée par rotation Download PDFInfo
- Publication number
- EP0952424B1 EP0952424B1 EP98401013A EP98401013A EP0952424B1 EP 0952424 B1 EP0952424 B1 EP 0952424B1 EP 98401013 A EP98401013 A EP 98401013A EP 98401013 A EP98401013 A EP 98401013A EP 0952424 B1 EP0952424 B1 EP 0952424B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ogive
- flat
- fin
- trajectory
- guidance system
- 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 - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B10/00—Means for influencing, e.g. improving, the aerodynamic properties of projectiles or missiles; Arrangements on projectiles or missiles for stabilising, steering, range-reducing, range-increasing or fall-retarding
- F42B10/60—Steering arrangements
- F42B10/62—Steering by movement of flight surfaces
Definitions
- the present invention relates to a micro-control device for correction of trajectory of ammunition stabilized by rotation.
- the deviations between the point of impact of a shell and its target are usually defined in terms of precision errors and accuracy measured in the longitudinal displacement directions and cross-section of the shell.
- the precision error corresponds to random dispersions inherent in weapon systems. This error which can not be compensated by the pointing of the weapon intervenes mainly on range deviations.
- the accuracy error corresponds at identical deviations during a short time interval it is due to atmospheric disturbances and pointing errors. This error which can be corrected by a change in aiming of the weapon, is characterized by both lateral and span deviations. However, a correction by simple depointing of the weapon is not generally not sufficient to compensate for the effects of disturbances encountered by the shell.
- the duck-based system has the advantage over the precedent of correct range and lateral deviations by creating force in a fixed shot by fins aimed at the front of the shell and which are decoupled in rotation. It also has the advantage that it allows to exploit the relative movement of the duck relative to the rocket for activate an electric current generator to supply the electronic circuits necessary for actuating the duck.
- a major drawback of piloting by duck is that it requires placing a tail stabilized at the rear of the shell, which makes the shell incompatible with the loading systems in the barrels currently existing.
- the object of the invention is to overcome the aforementioned drawbacks.
- the invention relates to a device for microswitch for the correction of the trajectory of stabilized ammunition by rotation of the type comprising a proximity rocket having a warhead movable in rotation relative to the body of the ammunition, characterized in what it includes a retractable flat on the surface of the rocket proximity to create a transverse aerodynamic force normal to the plane of the flat part when the flat part is uncovered and a deployable fin articulated on the warhead to allow fixed stabilization of the warhead by compared to fixed benchmarks in space.
- the invention has the advantage that it improves the both the accuracy and the accuracy of the shots by controlling both the drag and lift of the shell by modifying the obliquity of balance. It also has the advantage of being able to be applied to shells statically unstable, that is to say without a tail, which makes it compatible with shell loading systems in existing guns.
- the example of rocket architecture according to the invention which is shown in Figure 3 includes a conical warhead 1 movable in rotation about its axis of symmetry XX 'at the end 2 an axis 3 of which the other threaded end 4 is engaged at the conical front a shell 5.
- the rotation of the warhead 1 on the axis 3 is ensured by a bearing bearing 6.
- the warhead 1 contains a positioning system by satellite 7 still known by the abbreviation Anglo-Saxon GPS de "Global positioning system" possibly associated with an indicator of vertical or horizontal 8 composed for example by a central inertial, and to a guidance system 9 with calculator for calculating and correct trajectory errors.
- a receiver and / or transmitter unit radio is incorporated into the guidance system 9 for ensure the transfer of flight data during the firing between the flight system guidance 9 and a ground station.
- the shell of the warhead 1 is made of a material transparent to electromagnetic waves.
- the angular position of the rocket relative to the marks terrestrial is controlled by a fin 10 articulated along a generative of the truncated cone of the warhead pointed at the outside of the warhead under the action of a motor 11 controlled from the guidance system 9.
- the computer is not located in the system guidance 9 but in the ground station and the data necessary for correction calculations are transmitted by radio between elements 7, 8 and 9 of the warhead 1 and the computer.
- the fin 10 When firing the shell, the fin 10 is rolled up on the surface of the fuselage and is deployed during the flight when a correction of trajectory is to be performed.
- a flat 12 parallel to the axis of symmetry XX ' is practiced in the fuselage opposite the fin 10.
- the flat 12 is covered by an ejectable cover 13. It allows when the cover 13 is ejected to create a lateral force F capable of modifying the obliquity of the shell.
- the cover 13 is unlocked during flight by a cutter pyrotechnic 14.
- An electric current generator in the form of a alternator consisting of a stator 15 fixed to the warhead 1 and a rotor 16 fixed to the end of axis 3 allows to supply electricity to the assembly electrical and electronic circuits of the warhead 1.
- the operating principle of the system consists in starting of a target whose position known a priori is transmitted by radio to the guidance system, to be detected via the navigation system by satellite 7 or the inertial unit 8 trajectory errors early enough to have time to integrate small forces amplitudes.
- the computer of the guidance system 9 or of the station at ground gives the instant of triggering of the correction system and the plan correction.
- the duration of the correction represents the parameter which modulates the amplitude of the correction.
- the cover 13 is separated by centrifugal effect of the warhead 1 at the instant of the calculated triggering. he then gives way to the flat 12 which generates by asymmetry of the resulting air flow, a lateral force F, as shown in FIG.
- a device pyrotechnic unlocks the fin 10 before the ejection of the hood 13.
- the fin then unfolds from the skin of the rocket by effect centrifugal around an axis of rotation 17, and locks in position deployed in a fixed position on this axis by means of a device ball locking for example, not shown.
- the fin 10 thus deployed stops the rotation of the warhead 1 and makes it possible to determine the orientation at give the flat 12 relative to the landmarks in order to effect trajectory correction.
- the orientation of the flat 12 in one direction is controlled by the action of the fin 10 in the deployed position, which is rotated by the engine 11 around an axis 18 normal to the surface of the fuselage warhead 1.
- the improvement in range accuracy is obtained by the increase in drag induced by the two shock waves generated by the flat (shock wave 2) and the fin 10 (shock wave 3) in Figure 5.
- the range is increased if the lateral force F thus created is vertical and directed upwards.
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
- Radar Systems Or Details Thereof (AREA)
Description
- la figure 1, une fusée à jupe déployable selon l'art antérieur,
- la figure 2, une fusée munie de canard selon l'art antérieur,
- la figure 3, un exemple d'architecture de fusée selon l'invention,
- la figure 4, une vue suivant la coupe a de la fusée représentée à la figure 3,
- la figure 5, une topologie montrant d'écoulement de l'air sur l'ogive de la fusée,
- les figures 6a et 6b, le dispositif d'actionnement de la gouverne de la fusée représentée à la figure 3,
- et la figure 7, la position d'équilibre d'un obus équipé d'une fusée selon l'invention.
Claims (6)
- Dispositif de microgouverne pour la correction de la trajectoire de munition stabilisée par rotation, du type comportant une fusée de proximité ayant une ogive mobile en rotation relativement au corps de la munition, caractérisé en ce qu'il comprend un méplat escamotable (12), à la surface de la fusée de proximité, pour créer une force aérodynamique transversale normale au plan du méplat (12) lorsque le méplat est découvert et une ailette déployable (10), articulée sur l'ogive (1), pour permettre une stabilisation fixe de l'ogive (1) par rapport à des repères fixes de l'espace.
- Dispositif selon la revendication 1 caractérisé en ce qu'il comprend, intégré dans l'ogive (1), un système positionneur par satellite (7), un indicateur de verticale (8) et un système de guidage (9) couplé à un calculateur pour calculer après le tir de la munition les erreurs de trajectoire et déterminer l'instant de commande de l'orientation du méplat (12) par déplacement de l'ailette (10) relativement à l'ogive (1) afin de corriger les erreurs de trajectoire.
- Dispositif selon la revendication 2, caractérisé en ce que le système de guidage (9) comporte un bloc récepteur et/ou transmetteur radio pour transmettre les données de vol entre le système de guidage et une station au sol.
- Dispositif selon l'une quelconque des revendications précédentes 1 à 3, caractérisé en ce que l'ailette (10) est déployée pour permettre le freinage en rotation de l'ogive (1) avant que le méplat (12) soit découvert.
- Dispositif selon la revendication 4, caractérisé en ce que le méplat (12) est recouvert par un capot (13) qui est désolidarisé de l'ogive (1) par effet centrifuge à un instant déterminé par le système de guidage (9).
- Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce que l'ailette (10) est dépliée de la peau de l'ogive (1) sous l'effet d'un dispositif pyrotechnique.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9704276A FR2761769B1 (fr) | 1997-04-08 | 1997-04-08 | Dispositif de microgouverne pour la correction de trajectoire de munition stabilisee par rotation |
EP98401013A EP0952424B1 (fr) | 1997-04-08 | 1998-04-24 | Dispositif de microgouverne pour la correction de trajectoire de munition stabilisée par rotation |
DE1998610265 DE69810265T2 (de) | 1998-04-24 | 1998-04-24 | Mikroleitwerkeinrichtung zur Veränderung der Flugrichtung eines rotationsstabilisierten Geschosses |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9704276A FR2761769B1 (fr) | 1997-04-08 | 1997-04-08 | Dispositif de microgouverne pour la correction de trajectoire de munition stabilisee par rotation |
EP98401013A EP0952424B1 (fr) | 1997-04-08 | 1998-04-24 | Dispositif de microgouverne pour la correction de trajectoire de munition stabilisée par rotation |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0952424A1 EP0952424A1 (fr) | 1999-10-27 |
EP0952424B1 true EP0952424B1 (fr) | 2002-12-18 |
Family
ID=26151621
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98401013A Expired - Lifetime EP0952424B1 (fr) | 1997-04-08 | 1998-04-24 | Dispositif de microgouverne pour la correction de trajectoire de munition stabilisée par rotation |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0952424B1 (fr) |
FR (1) | FR2761769B1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SE511986C2 (sv) * | 1995-10-06 | 2000-01-10 | Bofors Ab | Sätt att korrigera projektilbanan för rotationsstabiliserande projektiler |
JP4882099B2 (ja) * | 2008-09-25 | 2012-02-22 | 防衛省技術研究本部長 | 飛しょう体 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3262655A (en) * | 1963-12-26 | 1966-07-26 | Jr Warren Gillespie | Alleviation of divergence during rocket launch |
DE3612175C1 (de) * | 1986-04-11 | 1987-10-08 | Messerschmitt Boelkow Blohm | Schnellfliegender Flugkoerper |
DE3815290C1 (fr) * | 1988-05-05 | 1989-08-17 | Messerschmitt-Boelkow-Blohm Gmbh, 8012 Ottobrunn, De | |
US5322243A (en) * | 1992-06-25 | 1994-06-21 | Northrop Corporation | Separately banking maneuvering aerodynamic control surfaces, system and method |
-
1997
- 1997-04-08 FR FR9704276A patent/FR2761769B1/fr not_active Expired - Fee Related
-
1998
- 1998-04-24 EP EP98401013A patent/EP0952424B1/fr not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
FR2761769A1 (fr) | 1998-10-09 |
EP0952424A1 (fr) | 1999-10-27 |
FR2761769B1 (fr) | 1999-07-02 |
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