NL1001556C2 - Fragmentable projectile, weapon system and working method. - Google Patents

Fragmentable projectile, weapon system and working method. Download PDF

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Publication number
NL1001556C2
NL1001556C2 NL1001556A NL1001556A NL1001556C2 NL 1001556 C2 NL1001556 C2 NL 1001556C2 NL 1001556 A NL1001556 A NL 1001556A NL 1001556 A NL1001556 A NL 1001556A NL 1001556 C2 NL1001556 C2 NL 1001556C2
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NL
Netherlands
Prior art keywords
projectile
target
information
weapon
offset
Prior art date
Application number
NL1001556A
Other languages
Dutch (nl)
Inventor
Jan Klaas Brouwer
Original Assignee
Hollandse Signaalapparaten Bv
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Priority to NL1001556A priority Critical patent/NL1001556C2/en
Priority to NL1001556 priority
Application granted granted Critical
Publication of NL1001556C2 publication Critical patent/NL1001556C2/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42BEXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B12/00Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
    • F42B12/02Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
    • F42B12/20Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type
    • F42B12/22Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect of high-explosive type with fragmentation-hull construction

Description

Fraomentable projectile, weapon system and working method
The invention relates to a projectile for destroying a target, provided with fragmentation means 5 and detonation means and ignition means for detonating the detonation means.
The invention also relates to a weapon system for destroying a target, comprising a fire control system for tracking the target, a launch tube for launching projectiles provided with fragmentation means and detonation means and ignition means for igniting the detonation means.
The invention also relates to a method for destroying a target with the aid of projectiles, provided with fragmentation means and detonation means and ignition means for igniting the detonation means, comprising detecting the target with the aid of a target sensor, controlling a launch tube based on information from the target sensor and the firing of one or more projectiles using the launch tube.
When deploying projectiles against air targets, the chance that a target is hit is now very small. For this reason, fragmentable projectiles are usually used, which fragment when they have approached the target sufficiently close. In this way, one tries to hit the target with the fragments of the fragmenting projectile. The moment of fragmentation can be determined by the projectile itself, for example by using a proximity fuse. The projectile usually fragments when the projectile passes the target. 1001556 is used for this.
2 of a wide fragment bundle in order to realize a ready chance of hitting the fragments with the target. Proximity fuses are usually used in grenades with calibres of 40 mm 5 and larger, due to the required installation space. A typical projectile velocity of the projectile is of the order of 500 m / s and a typical velocity of the fragments flying apart is of the order of 1700 m / s. The disadvantage of the usual projectiles with proximity fuses is the short range, where there is still a sufficient fragment density to destroy the target.
Another type of projectile that can provide a solution for this is known as AHEAD ammunition. The projectile hereby fragments substantially in a narrow cone, the main direction of which coincides with the direction of movement of the projectile. In this way, even at a greater distance from the projectile, a sufficient fragment density will still be present to be able to destroy the target. For the fragmentation of such ammunition, a proximity fuse is usually not used, since it usually only activates at the moment of passing the target, but for example a 'time imprinting' mechanism. Here the initial velocity of the projectile at launch is measured and on this basis the fragmentation time is given directly to the projectile. The disadvantage of such a projectile is that the trajectory of the fragments must almost coincide with the target trajectory in order to hit the target. In practice, this means that this type of projectile must approach the target within 2 to 3 meters. Due to the various error factors that always occur, such as target maneuvers and inaccuracies in track redo, this is difficult to realize in practice.
35 1 0 0 1 5 5 c.
3
A solution to this problem can be found in making the projectile controllable. However, this requires expensive facilities and makes the projectile heavier.
Another solution is known from US patent US-A 5,322,016. In said patent specification a projectile is described which fragment in such a way that the fragments move away from the projectile in a widening ring. It is then assumed that at least some fragments will hit the target. The projectile in said patent is detonated by telemetry. Seen in space, because of the forward velocity of the projectile during fragmentation, the fragments thus move between an inner cone and an outer cone with a common principal direction coinciding with the direction of movement of the projectile. A denser fragment bundle, thus in principle a lower chance of hit with the same amount of fragments, is thus achieved than when using the conventional projectiles with proximity fuses. By accurately tracking the target position and projectile position and using a telemetry signal for detonation, an ignition timing can be recorded such that the target 25 is hit with greater certainty by the ring of fragments. The disadvantage of such a projectile is that a relatively low density of fragments is still achieved at the point of contact with the target.
The projectile, the weapon system and the method according to the invention aim to achieve a concentrated fragment bundle and at the same time a ready chance of hitting, also at a considerable mis-distance (the distance under which the target is passed), without the provision of expensive provisions in the projectile.
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4
The projectile according to the invention is therefore characterized in that the projectile is designed for at least substantially fragmenting in a spatial sector, a main direction of which does not coincide with the direction of movement of the projectile.
The weapon system according to the invention is therefore characterized in that the projectiles are designed per projectile for at least substantially fragmenting in a spatial sector, a main direction of which does not coincide with the direction of movement of the projectile in question.
The method according to the invention is therefore characterized in that the moment a projectile has approached the target 15 sufficiently close, the projectile fragments mainly in a direction towards the target and in a spatial sector, a main direction of which does not coincide with the direction of movement. of the projectile.
The projectile according to the invention can also comprise a missile. The fragmentation means can here comprise all kinds of fragments. The projectile, weapon system and method according to the invention produces a narrower fragment bundle, so that with a much smaller caliber of ammunition the same chance of killing as with conventional ammunition can be achieved. In addition, a larger mis-distance can be corrected by determining the detonation moment at which the projectile has taken a rotational position such that the target can be hit with the fragments, which will significantly increase the average kill rate per shot.
It should be noted that when fragmenting the projectile, the center of mass of the set of 35 fragments disintegrating under the law of conservation of momentum in 1 0 0 1 5 5. » 5 essentially continues to follow the projectile trajectory, subject to external forces such as air resistance. Therefore, if one wishes to effect a concentrated fragment bundle substantially in a certain direction, a sufficiently high counter mass is moved in the opposite direction during fragmentation. One can think of the projectile body, but also an additional fragment bundle.
10
When determining the spatial distribution of fragments, a balance must be made between the chance of hitting and the density of the fragment bundle. At a high density of the fragment beam, if the target is hit, the target will almost certainly be destroyed. However, the chance of hitting the target increases as the fragment beam spread increases. However, the fragment density then becomes lower. A favorable compromise is reached in an embodiment of the projectile, characterized in that a intersection of the spatial sector includes a plane perpendicular to the direction of movement of the projectile at an angle of 5 to 90 degrees.
On the same grounds, a favorable compromise is reached in an embodiment of the projectile, characterized in that a intersection of the spatial sector with a plane through the direction of movement and the main direction of the spatial sector includes an angle of 5 to 30 degrees.
An advantageous way of effecting a directed beam of fragments is achieved in an embodiment of the projectile, characterized in that the fragmentation means are located in a barrel in the projectile, which encloses an angle other than zero with the direction of movement of the projectile. In this case, the barrel is preferably closed at its outlet side by a relatively weak side wall, so that at the moment of fragmentation the fragments exit through the relatively weak side wall.
5
Several ways are conceivable for the projectile to fragment. In a first favorable embodiment, this is done on the basis of information transmitted by telemetry. It is conceivable here that the signal up to 10 fragmentation is emitted directly by telemetry, but it is also conceivable that the projectile itself determines the most favorable moment of fragmentation on the basis of the information transmitted by telemetry. The projectile preferably waits for the moment that it has assumed a suitable spatial rolling position, so that the main direction of the fragment beam points towards the target.
Therefore, a favorable embodiment of the projectile according to the invention has the feature that the projectile is further provided with receiving means for receiving external information and in that the firing means are adapted to activate on the basis of the received external information.
On the basis of this, a further favorable embodiment of the projectile according to the invention is also characterized in that the ignition means are also arranged for activating on the basis of roll position information of the projectile. The projectile can determine its roll position 30 on the basis of the external information, wherein an external sensor measures the roll position of the projectile and transmits the roll position information to the projectile via telemetry. It is also conceivable that the projectile itself measures its own rolling position, for example with the aid of a gyroscope, or in a manner as described in the 10 01 5f 6.1 7 European patents EP-B-0.239.156, EP-BO.341.772 or EP-BO.345.836, which uses roll position determination by determining the direction of electromagnetic field lines of radio waves emitted by a ground station 5.
To this end, a further favorable embodiment of the projectile according to the invention is characterized in that the projectile is provided with rolling position determining means for determining its rolling position.
Another favorable embodiment of the projectile according to the invention is characterized in that the rolling position determining means are arranged for determining its rolling position on the basis of the received external information.
The external information may come from a fire control system, which continuously determines the target position using a target sensor. The projectile position can be determined continuously with the same or a different sensor 20 or on the basis of a ballistic model, possibly combined with a measurement of the initial velocity of the projectile. On this basis, the fire control system can continuously determine the relative position of the projectile relative to the target. If the projectile is sufficiently close to the target, the fire control system can generate an activation signal. On the basis of this activation signal, the projectile can give a release signal for activation of the detonation means. However, it is likely that the projectile is not yet in the correct rotational position at that time, so that the projectile does not fragment toward the target. The solution to this can now be found in delaying fragmentation until the projectile has assumed the correct rolling position. This correct roll position, or offset 1 0 0 1 5 5 6.: Δ roll angle, can be determined almost continuously by the fire control system based on the relative position of the target relative to the projectile and can be sent out almost continuously. It is also conceivable that the relative position of the target relative to the projectile or the absolute position of the target and the absolute position of the projectile are emitted almost continuously. Based on the transmitted information, the projectile can determine an offset roll angle and continuously compare it with the actual roll angle of the projectile. The moment these are at least virtually the same, the projectile can fragment, provided the release signal has been given.
A further favorable embodiment of the projectile according to the invention is therefore characterized in that the projectile is provided with means for supplying a release signal to the ignition mechanism for allowing ignition and with means for extracting a desired offset roll angle from the external information and means for activating the ignition means at a time when the release signal is given and the projectile roll position at least substantially corresponds to the desired offset roll angle.
25
However, instead of telemetry, the release signal can also be given based on proximity fuse information. The advantage of this is that it is much less sensitive to jamming.
30
A further favorable embodiment of the projectile according to the invention is therefore characterized in that it is provided with a proximity fuse and that the release signal is given on the basis of information from the proximity fuse.
1 0 0 1 5 56., 9
In a practical situation, several projectiles will usually be fired at the target in order to increase the kill probability. For each projectile, however, a different moment applies at which the release signal must be given and a different offset roll angle, under which the relevant projectile may fragment. A solution to this problem can be found by coding the transmitted signals per projectile, so that each projectile can select the information related to that projectile. European patent EP-B-0.354.608 describes how coding per projectile fired can take place. Optionally, a series of a number of projectiles fired in close succession can select information with the same code, so that they will activate at the same rolling position after the release signal has been given. In this way, a kind of 'barrage' will occur in a certain direction, which increases the chance of killing. It is usually sufficient to broadcast a single offset roll angle substantially continuously.
20 The projectile that is sufficiently close to the target can use this offset roll angle to detonate. This saves bandwidth of the signals to be transmitted.
A further favorable embodiment of the projectile according to the invention is therefore characterized in that the projectile is further provided with a decoding device for selecting information related to the projectile from the external information if the external information is encoded.
In an embodiment of the weapon system according to the invention, optimum use is made of the substantially laterally fragmenting projectiles by fragmenting them remotely on the basis of 10 015: 6 ..
10 information from the fire control system. The projectile preferably determines the most favorable moment of fragmentation on the basis of information transmitted by the fire control system.
5
A further favorable embodiment of the weapon system according to the invention, is characterized in that the projectiles are provided with receiving means for receiving external information, that the firing means 10 are arranged to activate on the basis of the external information and that the fire control system is arranged to send the external information.
In an embodiment of the weapon system according to the invention, preferably means are provided for rotating the projectiles so that they obtain a controlled rotation. These means can be arranged on the projectile itself, for instance in the form of specially shaped fins, but it is also conceivable that the rotation arises in known manner through the interaction of the launch tube and the projectile. Due to its rotation and forward speed, the missile with its submunitions now covers a helical trajectory. After a complete revolution, the projectile has traveled a certain distance, which distance, or the "pitch" of the helical trajectory, is smaller the higher the rotational speed relative to the forward speed. Several moments thus arise, at least if the projectile is in the vicinity of the target, at which the projectile with its fragment beam can reach the target. The higher the projectile rotation speed relative to the projectile forward speed, the greater the number of moments. In this way it is therefore always possible to cover the target track with a concentrated fragment bundle, which is a great advantage. 1 0 0 1 5 5 C.
11 is relative to the existing fragmentable projectiles. The projectile may be provided with means for determining its roll position, and fragment on a suitable roll position based on roll position measurements and knowledge of its own position relative to the target.
A further favorable embodiment of the weapon system according to the invention is thus characterized in that further means are provided for rotating the projectiles and in that the projectiles per projectile are provided with rolling position determining means and that the ignition means are also adapted to activate on based on the roll stand information in combination with the 15 external information.
The fire control system can determine a suitable offset rolling angle based on measured target positions and projectile positions, which a projectile must assume in order to hit the target with its fragments.
A further favorable embodiment of the weapon system according to the invention is therefore characterized in that the external information comprises offset roll angle information on the basis of which a certain fired projectile can determine an offset roll angle, which offset roll angle must assume the certain fired projectile at the moment of fragmentation in order to be able to fragments hit the target with a reasonable chance if the projectile were sufficiently close to the target. The fire control system can then send the offset roll angle itself. It is also conceivable for the target position and the projectile position, or the target position, to be sent relative to the projectile position, so that the projectile itself can determine the offset roll angle.
10 015 5 6. » 12
A further favorable embodiment of the weapon system according to the invention is therefore characterized in that the offset roll angle information comprises the offset roll angle itself, which is determined on the basis of the target position and the position of the certain projectile fired.
A further favorable embodiment of the weapon system according to the invention is therefore characterized in that the offset roll angle information comprises the target position and the position of the certain projectile fired.
Another favorable embodiment of the weapon system according to the invention is therefore characterized in that the offset roll angle information comprises the relative position of the target 15 relative to the certain projectile fired, which is determined on the basis of the target position and the position of the certain projectile fired. .
Projectile position measurements can be used to determine the offset roll angle. However, it is cheaper, although more inaccurate, not to have to measure it, but to use an accurate ballistic model to determine it.
A further favorable embodiment of the weapon system according to the invention is characterized in that the position of the certain fired projectile comprises a position determined from a ballistic model and a measured initial speed of the certain fired projectile.
30
The fire control system can now, if the projectile has approached the target sufficiently close, generate a release signal, after which the projectile can wait until it has assumed an appropriate rolling position, and then fragment.
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13
A further favorable embodiment of the weapon system according to the invention is characterized in that the external information also comprises a release signal for allowing an ignition of the detonation means for a projectile that the target is sufficiently close.
Fragmentation is now preferably done in such a way that the main direction of the fragment sector points towards the target, in order to achieve a maximum chance of hitting.
10
A further favorable embodiment of the weapon system according to the invention is characterized in that the desired offset roll angle is selected such that the main direction of the sector points essentially towards the target.
15
In order to allow the weapon system to fire multiple projectiles in rapid succession, it is advantageous to provide each projectile with a code such that each projectile can select information related to itself. The fire control system can now calculate offset roll angles for each projectile or for a number of closely located projectiles and transmit them in coded form.
A further favorable embodiment of the weapon system according to the invention is to that end characterized in that the external information comprises coded offset roll angle information from which a series of offset roll angles can be determined, per offset roll angle valid for one projectile or several projectiles that are close to each other during their flight. and that the projectiles are provided with a decoder which allows a projectile from the range of offset roll angles to select an offset roll angle related to that projectile.
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14
In a favorable embodiment of the method according to the invention, the projectile fragments such that the target is hit by the fragments with a reasonable chance.
5
A further favorable embodiment of the method according to the invention is for this purpose characterized in that a rotation is imparted to the projectile, that the projectile determines its rotation position substantially continuously in space, and that the projectile is further provided at least almost continuously from the outside of offset roll angle information and that based on this the projectile determines an offset roll angle, which offset roll angle the projectile must assume at the time of fragmentation, in order to hit the target with a reasonable chance with its fragments, if the projectile were to approach the target sufficiently close to be.
The projectile position can be measured continuously or determined by a ballistic model. The latter is cheaper but less accurate.
A further favorable embodiment of the method according to the invention is therefore characterized in that the offset roll angle information is determined on the basis of a ballistic model of the projectile and on the basis of measured target positions.
Another favorable embodiment of the method according to the invention is therefore characterized in that it is determined on the basis of a ballistic model of the projectile and on the basis of measured target positions and a proximity criterion whether the projectile has approached the target sufficiently closely.
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15
A further favorable embodiment of the method according to the invention is characterized in that on the basis of information from a proximity fuse and a proximity criterion it is determined whether the projectile has approached the target 5 sufficiently close.
A further favorable embodiment of the method according to the invention is characterized in that the external information comprises coded offset roll angle information from which a series of offset roll angles can be determined, per offset roll angle valid for one projectile or several projectiles that are close to each other during their flight and that the offset roll angle information per projectile is decoded to obtain an offset roll angle related to the respective projectile.
The projectile, weapon system and method according to the invention will now be further explained with reference to the following figures, in which: 1 represents an embodiment of the projectile according to the invention;
Fig. 2 shows how the projectile according to the invention can fragment;
Fig. 3 indicates how the coverage of a rotating projectile according to the invention is;
Fig. 4 indicates how the projectile according to the invention should be used;
Fig. 5 represents a weapon system according to the invention.
Figs. 1A and 1B show an embodiment of the projectile according to the invention in longitudinal section and cross section, respectively. The projectile preferably has a caliber from 35 to 76 mm, but other calibers are also conceivable. The projectile 1 is provided with a cavity 2, in which detonation means and 100155.
16 fragmentation agents are included. The cavity 2 has the shape of a loop, so that the fragments will emerge obliquely forward upon detonation. On one side there is a window 3 of a weaker material type. Upon detonation, the projectile will fragment substantially toward the window. The projectile may be provided with means for determining its rotational position along its direction of movement. Preferably, use is made of the principle as set out in European patents EP-B-0.239.156, EP-B-0.341.772 or EP-B-0.345.836, in which the roll position is determined by detecting the position to electromagnetic field lines emitted from a ground station. For this purpose a receiver must be built in which can detect the direction of electromagnetic field lines. Furthermore, the projectile can be provided with a receiver which can detect an external trigger signal for triggering the detonation means. Optionally, both receivers can be the same if the electro-magnetic field for rolling position determination is also used to transmit the trigger signal. This saves an extra receiver. Finally, a receiver can be built in, with which an offset roll angle signal can be received, which can also be combined with the aforementioned receivers. This offset roll angle signal can be the offset roll angle, which the projectile must adopt before detonating. The offset roll angle signal can now be continuously compared with the measured roll position. If the trigger signal is given and the offset roll angle corresponds to the measured roll position, the projectile can detonate.
Figures 1C and 1D show a longitudinal section and a cross section, respectively, of another embodiment of the projectile according to the invention. The cavity in which 10 01 5 L * 6.
17 the fragmentable matter and the detonation means are included here comprises an elongated trough 4. Another window 5 of a weaker type of material is arranged along the length of the trough. In this embodiment, the main direction of the fragment beam upon detonation will make a greater angle to the direction of movement of the projectile than in the embodiment in Figures 1A and 1B. The distribution of the fragments will also be larger. This embodiment can typically be applied if a proximity fuse is used to detect the passage of the target. The target is then located more to the side of the projectile, requiring a wider fragment beam to hit the target.
Fig. 2 shows a fragmentable projectile 1 according to the invention. In the figure, a coordinate system indicated by X, Y and Z is shown. The projectile moves through the airspace at a certain forward speed 6 instantaneously along the X axis. In the known projectiles, the projectile fragments such that the fragments move in an expanding ring 7 relative to the projectile position. Due to the forward velocity of the projectile, the fragments in the expanding ring will pass through a space between an inner cone and an outer cone with coincident principal direction equal to the direction of movement of the projectile. The difference in top angle of the inner cone and the outer cone determines the distribution of the fragments. In the projectile according to the invention, the projectile 1 fragments such that the fragments move in a sector 8 of the expanding ring. A main direction in which the fragments move is indicated by arrow 9. The main direction makes an angle 10 with the direction of movement of the projectile. This depends inter alia on the forward velocity of the projectile and the force of the detonation. Thus, the fragments move in a spatial sector 11 which cuts out a sub-area of the said inner cone and outer cone. In this way, the fragment beam which would normally move in the ring around the projectile is concentrated in a much smaller area, whereby a considerably higher fragment density is obtained or, if corresponding density as a conventional projectile, a much greater mis-distance can be bridged. The fragment density 10 is partly determined by the angle 12 which encloses the intersection of the Y2 plane, perpendicular to the direction of movement of the projectile, with the fragment beam and the angle 13 which intersects the intersection of the XY plane, through the direction of movement 6 of the projectile. and includes the main direction 9 of the fragment bundle, with the fragment bundle. In the figure, the angle 12 is chosen to be about 90 degrees and the angle 13 to be about 15 degrees, but other angles are also feasible. By choosing the corners small, a high density is obtained. As a result, the chance of hitting fragments with a target decreases. By choosing the angles large, a lower density is obtained. The chance of hitting a target increases as a result. An optimum is between 5 and 90 degrees in the directions transverse to the projectile and between 5 and 30 degrees in the directions parallel to the projectile. With respect to the projectile position during detonation, the fragments move in direction 14, which in the indicated situation includes an angle of 90 degrees with the direction of movement. Other angles can also be realized in the embodiment in which the fragmentation means are placed in the projectile in a barrel, by choosing the angle of the barrel differently. Due to the law of momentum conservation, the projectile's shell will move in the opposite direction at a speed depending on the mass ratio between shell and fragmentation.
19 means and beyond of the power of detonation. The sleeve is preferably chosen to be heavier than the fragmentation means, depending on the necessary penetration of the fragments at a certain desired distance.
5 If a proximity fuse is used, the angle that the main direction makes with the direction of movement of the projectile must be greater than with remote detonation. After all, when detonating at a distance, the projectile can be fragmented earlier.
10
Fig. 3 shows the coverage of the fragments during the movement of a rotating projectile according to the invention through the airspace, the fragment beam being a fictional beam, which would arise if the projectile were to detonate in the relevant situation. The projectile is drawn in a first situation A, in which the main direction of the fragment beam 9 lies in the plane of the drawing and in a second situation B, in which the projectile has undergone a rotation of 360 degrees. The main direction 9 of the fragment beam thus traverses a helix along the axis of rotation 16 of the projectile. A dead area 25 in which no target can be hit is enclosed by the bottom 17 of the fragment beam in situation A and the top 18 of the fragment beam in situation B. This dead region becomes smaller the faster the projectile's revolution speed compared to the forward speed. There is also an overlap area 20 in which a target can be hit by the projectile in both situation A and situation B.
Figures 4A and 4B schematically show in side view and front view with respect to the projectile 1, respectively, how the projectile 1 according to the invention can preferably be used against a target 21, which is situated 1 0 0 1 5 5c '. 20 moves along target track 22. The projectile moves along projectile track 23. Two situations I and II in time are indicated. In situation I, the projectile is in close proximity to the target to destroy it upon fragmentation if the projectile had the correct rotational position. However, as shown in front view in Fig. 4B, this is not the case. If the projectile were to detonate in situation I, then the main direction 9 of the fragment bundle at that moment did not coincide with the direction to the target 21. Therefore, fragmentation should be waited until the projectile has rotated so far that both directions coincide. as shown in Figs. 4A and 4B with situation II. The target and projectile may then have moved slightly relative to each other, but the fragment bundle is sufficiently wide to still be able to hit the target.
In order to determine whether the projectile is in sufficient proximity to the target, the projectile is provided with a receiver and a fire control system sends a corresponding signal to the projectile in situation I. This signal is a necessary release signal for detonation, but is in itself still not enough to proceed to 25 detonation. Also, the fire control system substantially continuously sends the direction of the projectile 1 to the target 21. The projectile continuously measures its rotational position in space and compares the actual rotational position with the target direction. In situation II these 30 agree and the projectile proceeds to detonation. In the case of detonation by telemetry, the fact that the projectile has not yet assumed the correct rotational position can be taken into account when sending the release signal. In the worst case situation, the rotation 35 position is wrong 180 degrees. Thus, the release signal is preferably brought forward by the time it takes the projectile to rotate 180 degrees. In this way, the ignition time is at most this time earlier or later than the ideal time. Due to the width of the 5 fragment bundle, there is always a certain margin.
Fig. 5 shows a weapon system according to the invention. A target tracking system 24 tracks the target 25, for example an aircraft, and sends the target data to a gun system 26, which may optionally also include a missile launch tube if the missiles are missiles. A fire control system calculates a suitable holding angle in a known manner, after which the projectiles 1 are fired. The fire control system also keeps track of the projectile position per 15 projectile by means of a track model. The target position is also continuously monitored. Thus, the relative position of the projectiles with respect to the target 25 is always known, and therefore also the offset roll angle at which each projectile must fragment, in order to hit the target 25 with a reasonable chance of striking its fragments, if the relevant projectile is sufficiently close to the target. would be. A transmitter antenna 27 continuously transmits these relative positions or offset roll angles. With multiple projectiles these can be coded, so that each projectile can select the offset roll angle related to that projectile. Optionally, it is possible to transmit the offset roll angles at different frequencies. The offset roll angles can be emitted continuously, or at least at a time when a projectile is close enough to the target. It is also possible, assuming there is a projectile in the correct vicinity of the target, to continuously broadcast the roll angle related to this (fictional) projectile. Only a rolling angle then has to be emitted, which is favorable with a view to reducing the bandwidth of the 10 01 Γ 5 6 ..
22 signals to be sent. The transmitting antenna 27 can also emit an electromagnetic field which the projectiles can use to determine their rolling position, for example according to EP-B-0.239.156, EP-BO.341.772 or 5 EP-B-0.345.836, in which use of roll position determination by determining the direction of emitted electromagnetic field lines. Finally, the transmitting antenna can also transmit coded trigger signals if a projectile is close enough to the target.
Of course, separate transmitting antennas, possibly at different locations, can be used for the above three actions.
10 0 1 5 5 8 λ

Claims (34)

1. Projectile for destroying a target, provided with fragmentation means and detonation means and detonation means for detonating the detonation means, characterized in that the projectile is arranged for at least substantially fragmenting in a spatial sector, of which a main direction does not coincide with the direction of movement of the projectile. 10
Projectile according to claim 1, characterized in that a cross-section of the spatial sector with a plane perpendicular to the direction of movement of the projectile essentially includes an angle of 5 to 90 degrees. 15
Projectile according to claim 1 or 2, characterized in that a cross-section of the spatial sector with a plane through the direction of movement and the main direction of the fragmentation beam essentially includes an angle of 5 to 20 degrees.
4. Projectile according to one of the preceding claims, characterized in that the fragmentation means are arranged in a barrel in the projectile, which encloses an angle other than zero with the direction of movement of the projectile.
Projectile according to claim 4, characterized in that the barrel is closed at its exit side by a relatively weak side wall. 30
Projectile according to claim 4 or 5, carbon black, characterized in that a relatively weak strip is arranged in the side wall in the longitudinal direction. 1001556.
7. Projectile according to one of the preceding claims, characterized in that the projectile is provided with receiving means for receiving external information and in that the firing means are adapted to activate on the basis of the received external information.
Projectile according to claim 7, characterized in that the firing means are also adapted to activate on the basis of roll position information of the projectile. 10
Projectile according to claim 8, characterized in that the projectile is provided with rolling position determining means for determining its rolling position.
Projectile according to claim 9, characterized in that the roll position determining means are arranged for determining its roll position on the basis of the received external information.
11. Projectile according to any one of claims 8 to 10, characterized in that the projectile is provided with means for supplying a release signal to the ignition mechanism to allow ignition and with means for extracting a desired offset roll angle. from the external information and from means for activating the ignition means at a time when the release signal has been given and the rolling position of the projectile at least substantially corresponds to the desired offset rolling angle. 30
Projectile according to claim 11, characterized in that it is provided with a proximity fuse and that the release signal is given on the basis of information from the proximity fuse. 35 10 0 1 5 5 6 ..
Projectile according to claim 11, characterized in that the release signal is given based on the external information.
Projectile according to any one of claims 7 to 13, characterized in that the projectile further comprises a decoding device for selecting information related to the projectile from the external information if the external information is encoded. 10
A weapon system for destroying a target, comprising a fire control system for tracking the target, a launching tube for launching projectiles provided with fragmentation and detonation means and detonation means for detonating means, characterized in that the projectiles are arranged for at least substantially fragmenting in a spatial sector, a main direction of which does not coincide with the direction of movement of the projectile in question.
Weapon system according to claim 15, characterized in that the projectiles per projectile are provided with receiving means for receiving external information, that the ignition means are adapted to activate on the basis of the external information and that the fire control system is arranged to send the external information.
Weapon system according to claim 16, characterized in that means are further provided for rotating the projectiles and in that the projectiles per projectile are provided with rolling position determining means and that the ignition means are also adapted to activate on the basis of the rolling position information in combination with the external information. 10 015
Weapon system according to claim 17, characterized in that the external information comprises offset rolling angle information on the basis of which a certain fired projectile can determine an offset rolling angle, which offset rolling angle must assume the certain projectile fired at the moment of fragmentation in order to form the fragment with its fragments. target with a reasonable chance if the projectile were sufficiently close to the target.
Weapon system according to claim 18, characterized in that the offset roll angle information includes the offset roll angle itself, which is determined based on the target position and the position of the certain projectile fired.
Weapon system according to claim 18, characterized in that the offset roll angle information includes the target position and the position of the sure projectile fired.
Weapon system according to claim 18, characterized in that the offset roll angle information comprises the relative position of the target relative to the certain projectile fired, which is determined based on the target position and the position of the certain projectile fired.
Weapon system according to claim 19, 20 or 21, characterized in that the position of the sure projectile fired comprises a position determined from a ballistic model and a measured initial velocity of the certain projectile fired. 30
Weapon system according to claim 19, 20 or 21, characterized in that the position of the sure fired projectile comprises a measured position of the sure fired projectile. 35 10 0 1 556 ..
Weapon system according to any one of claims 16 to 23, characterized in that the external information also comprises a release signal for allowing ignition of the fragmentation means for a projectile that is close enough to target 5.
25. A weapon system according to any one of claims 16 to 24, characterized in that the desired offset roll angle is selected such that the main direction of the sector points substantially towards the target.
Weapon system according to any one of claims 18 to 25, characterized in that the external information comprises coded offset roll angle information from which a series of 15 offset roll angles can be determined, per offset roll angle valid for one projectile or several in close proximity during their flight projectiles and that the projectiles are provided with a decoder, by means of which a projectile from the series of offset roller angles can select an offset roller angle related to that projectile.
27. Method for destroying a target with the aid of projectiles, provided with fragmentation means and detonation means and ignition means for igniting the detonation means, comprising detecting the target with the aid of a target sensor, controlling a launch tube based on information from the target sensor and firing one or more projectiles using the launch tube, characterized in that the moment a projectile has approached the target sufficiently close, the projectile fragments substantially in a direction towards the target and in a spatial sector, a principal direction of which does not coincide with the direction of movement of the projectile. 1 0 0 1 556
Method according to claim 27, characterized in that a section of the spatial sector with a plane perpendicular to the direction of movement of the projectile includes an angle of 5 to 30 degrees. 5
A method according to claim 27 or 28, characterized in that a cross-section of the spatial sector with a plane through the direction of movement and the main direction of the spatial sector includes an angle of 5 to 30 degrees. 10
30. A method according to any one of claims 27 to 29, characterized in that a rotation is imparted to the projectile, that the projectile determines its rotational position in space substantially continuously, that the projectile furthermore becomes at least substantially continuous from the outside. provided with offset roll angle information and that on this basis the projectile determines an offset roll angle, which offset roll angle the projectile must assume at the moment of fragmentation, in order to hit the target with its fragments with a reasonable probability, if the projectile would have approached the target sufficiently close .
31. A method according to claim 30, characterized in that the offset roll angle information is determined based on a ballistic model of the projectile and based on measured target positions.
Method according to claim 30 or 31, characterized in that it is determined on the basis of a ballistic model of the projectile 30 and on the basis of measured target positions and a proximity criterion whether the projectile has approached the target sufficiently closely.
A method according to claim 30 or 31, characterized in that, based on information from a proximity fuse, it is determined whether the projectile is sufficiently close to the target.
34. A method according to any one of claims 30 to 33, characterized in that the external information comprises coded offset roll angle information from which a series of offset roll angles can be determined, per offset roll angle valid for one projectile or several in flight close to spaced projectiles and that the offset roll angle-10 information per projectile is decoded to obtain an offset roll angle related to the respective projectile. 1 0 0 1 5.56.
NL1001556A 1995-11-02 1995-11-02 Fragmentable projectile, weapon system and working method. NL1001556C2 (en)

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NL1001556A NL1001556C2 (en) 1995-11-02 1995-11-02 Fragmentable projectile, weapon system and working method.
NL1001556 1995-11-02

Applications Claiming Priority (9)

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NL1001556A NL1001556C2 (en) 1995-11-02 1995-11-02 Fragmentable projectile, weapon system and working method.
PCT/EP1996/004521 WO1997016696A1 (en) 1995-11-02 1996-10-17 Fragmentable projectile, weapon system and method for destroying a target
TR1998/00762T TR199800762T2 (en) 1995-11-02 1996-10-17 Fragmentable shell, weapon system and method to destroy a target.
AU72953/96A AU709972B2 (en) 1995-11-02 1996-10-17 Weapon system and method for destroying a target
DE69615574T DE69615574D1 (en) 1995-11-02 1996-10-17 FRAGMENTABLE PROJECTILE, WEAPON SYSTEM AND METHOD FOR DESTROYING A TARGET
EP19960934733 EP0856142B1 (en) 1995-11-02 1996-10-17 Fragmentable projectile, weapon system and method for destroying a target
CA 2235407 CA2235407A1 (en) 1995-11-02 1996-10-17 Fragmentable projectile, weapon system and method for destroying a target
ARP960104880 AR010449A1 (en) 1995-11-02 1996-10-24 A projectile to destroy a target, provided with a fragmentable medium, a detonation medium and a combustion medium, an armament system that includes it and a method of use thereof
NO981709A NO981709L (en) 1995-11-02 1998-04-16 Fragmentable projectile, weapon system and procedure for delegating a target

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DE (1) DE69615574D1 (en)
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Publication number Publication date
NO981709L (en) 1998-06-30
TR199800762T2 (en) 1998-07-21
AU7295396A (en) 1997-05-22
WO1997016696A1 (en) 1997-05-09
AU709972B2 (en) 1999-09-09
EP0856142A1 (en) 1998-08-05
EP0856142B1 (en) 2001-09-26
DE69615574D1 (en) 2001-10-31
CA2235407A1 (en) 1997-05-09
AR010449A1 (en) 2000-06-28
NO981709D0 (en) 1998-04-16

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