FR2646903A1 - FIRE-FIGHTING DEVICE FOR HOLLOW DOUBLE LOADED FIGHT HEAD - Google Patents

Abstract

Firing device for warhead comprising a main shaped charge and a maintenance pre-projectile in the central axis of a projectile, ejectable by means of a propellant charge and which contains a hollow pre-charge, a range finder Continuously operating laser serving as a distance detector which, when a nominal distance is reached, initiates the firing of the propellant charge and, after a variable delay, the firing of the main shaped charge, characterized as follows: a) the R values measured by the LEM laser rangefinder are compared to the nominal distance A; b) the delay time DELTA t between the firing of the propellant charge VHL-AS and the firing of the main shaped charge HHL-DET is adjustable; c) in the case where the first exploitable measured value R gives a distance less than the nominal distance A, the delay time DELTAt is set as a function of the flight time of the main shaped charge up to the optimum trigger point in front of the target, which can be calculated from the distance and / or speed of the projectile and the TL propellant charge is immediately triggered.

Description

- - 2646903

  FIRE-FIGHTING DEVICE FOR COMBAT HEAD

DOUBLE HOLLOW LOAD

  The invention relates to a firing device for combat head comprising a hollow charge

  and a pre-projectile maintained in the central axis

  of a projectile, ejectable by means of a propellant charge and which contains a hollow pre-charge, a laser telemeter operating continuously

  distance detector, which, when a nominal distance

  is reached, triggers the firing of the propellant charge and, after a variable delay, the firing of

the main hollow charge.

  A hollow double-shot projectile of this type

  is described in German Patent No. 37 36 952 of the

  health. When such projectiles are used against terrestrial objectives, the disadvantage is that the objective, for example by means of a laser warning detector, recognizes the projectile approaching and attempts to camouflage itself by a curtain of smoke. In such a cloud, the sensitivity of the laser distance sensor is no longer sufficient for the nominal distance of the lens. As a result, at the nominal distance, the distance detector does not emit a firing signal. In the case where the distance of the objective decreases, the density of the cloud decreases if

  although the sensitivity of the laser range finder would be sufficient

  health, there will be no firing as this is not

  not planned at the distance considered.

  It is therefore an object of the invention to improve the known proximity detonator fuze so that in the above described case of curtain camouflage

  smoke, at least one reduced action of

  tile against active armor. The firing device for fighting head according to the invention comprises a main hollow charge and

  a pre-projectile held in the central axis of a projec-

  tile, ejectable by means of a propellant charge and which

  contains a hollow pre-charge, a laser range finder

  continuously acting as a distance detector,

  which, when a nominal distance is reached, triggers

  the firing of the propellant charge and, after a

  delay, the firing of the main hollow charge

blade.

  According to the values measured by the laser range finder are compared to the nominal distance, the delay time between the firing of the propellant charge and the

  firing of the main hollow charge is adjustable.

  In the case where the first exploitable measured value gives a distance smaller than the nominal distance, the delay time is set according to the flight time.

  from the main hollow charge to the point of

  optimum in front of the objective, which can be calculated from the distance and / or the speed of the projectile and

  the propellant charge is immediately triggered.

  The firing of the pre-charge hollow can be

  advantageously triggered after a delay time cor-

  corresponding to the precalculated flight time of the pre-projectile from the point of release of the propelling charge to the optimum trip distance before the objective. The value of the delay time before triggering the propellant charge can be supplied to the

  firing of the pre-charge hollowed by the operating circuit

laser range finder.

  In a variant, the firing of the load

  initial dig is triggered by a proximity detector

placed before her.

  The value of the flight speed can be calculated

  from the continuous measurement of the distance, or be provided by a memory in the form of a determined value

before the mission.

  The particular advantage of the firing device lies in the fact that despite a camouflage of

  the objective by smoke curtain, the main hollow charge

  blade at least remains effective as a function of the effective distance projectile-objective at the time of the first

goal detection.

  An example of a non-limiting embodiment of

  the invention is illustrated in the drawings and described below.

below in detail.

  FIG. 1 is a sectional view of a projection

  FIG. 2 is a block diagram of the firing device, FIG. 3 is an organism of the operation of FIG.

Firing.

  Figure 1 schematically shows in section a dual-fired projectile comprising a main hollow charge HHL and a hollow pre-charge VHL maintained in the central position, which can be fired using a propulsive charge TL. The projectile further comprises a laser rangefinder (LEM) directed parallel to the central axis of the projectile. A laser is preferably used

  CW amplitude modulation.

  The laser distance meter LEM is, in accordance with FIG. 2, connected to a control circuit STG, which serves to evaluate the measured distance values R. It is checked first if it is a distance that can be exploited. If yes, in the example embodiment, the

  measured values are compared to control thresholds.

  This gives rise to different possibilities of piloting the VHL-AS firing device and triggering the VHL-DET firing of the VHL hollow preload as well as the triggering of the HHL-DET firing of the hollow charge.

  main HHL. The control circuit STG can be real-

  from a hardware and software point of view in a

current for a specialist.

  Figure 3 represents the course of the evaluation

  evaluation of the R measurement signals emitted by the LEM laser range finder. In the normal case, that is to say when the objective is not camouflaged, the measured value R is cyclically monitored at times t1 ... tn, to check whether it is greater than or equal to the comparative value A corresponding to the nominal trip distance,

  for which, on the one hand, the time available is sufficient

  for the removal of active shielding, and, on the other hand, the pre-project

  sufficient distance from the main hollow charge

  Cipale. As soon as the condition R = A is noted, the firing device VHL-AS of the pre-charge hollow, first receives a trigger signal, which, after the delay AT, triggers VHL-DET. Same

  time as the trigger signal of the firing device ,.

  the delay At of the main charge is started, and at the completion of this delay,

  the main hollow charge is fired HHL-DET.

  In the case where the objective is equipped with a

  He may have noticed the laser beam of the projectile range finder approaching and hiding with the aid of smoke generators. This is where the development of

  known measuring device which is the subject of the invention.

  Depending on the density of the smoke, the first exploitable measured value is only at an object-projectile distance substantially smaller than the nominal trigger distance A, which corresponds approximately to a size of thirty calibres of the

main hollow charge.

  If the measured distance is less than

  value A, while exceeding a first threshold S1, which cor-

  corresponds to ten calibres, the firing device of the pre-charge hollow is fired as in the normal case and it is triggered after an adjustable time interval T. The firing of the main hollow charge HHL -DET is done after a delay time At3 which is shortened according to the smaller distance between the

projectile and the objective.

  If the measured distance R is however smaller than the first threshold S1, while being greater than the second threshold S2, which corresponds to a distance between the projectile and the objective of two to three calibres, the delay times for triggering the two hollow charges must be reduced. The delay time AT of the hollow pre-charge is decreased to the minimum value At3 which is necessary for launching the hollow precharge. The delay time At for the triggering of the main hollow charge is likewise decreased until its

minimum value At2.

  Only if the first measured distance is below the second threshold S2, is the HHL-DET immediately fired from the main hollow charge, without prior ejection and firing of the pre-charge. dig. So even in such a situation

  which only occurs for very high density smoke.

  ture, it is ensured that the main hollow charge at least

will be fully effective.

Claims (5)

  1. Firing device for combat head   having a main hollow charge and a pre-projection   maintenance in the central axis of a projectile, ejected   table with a propellant charge and which contains a hollow pre-charge, a laser range finder operating   as a distance detector, which, when   that a nominal distance is reached, triggers the firing of the propellant charge and, after a variable delay, the firing of the main hollow charge, characterized as follows: a) the values (R) measured by the rangefinder at laser (LEM) are compared to the nominal resistance (A); (b) the lag time (<t) between the firing of the propelling charge (VHL-AS) and the firing of the main hollow charge (HHL-DET) is adjustable; (c) where the first measured value (R)   exploitable gives a distance less than   nominal time (A), the delay time (At) is set   according to the flight time of the main hollow charge   to the optimal trigger point in front of   the objective, which can be calculated from the   tance and / or projectile velocity and   propulsive (TL) is immediately triggered.   2. Firing device according to the claim   characterized in that the firing of the hollow pre-charge (VHL) is initiated after a delay time (AT) corresponding to the precalculated flight time of the pre-projectile from the trigger point of the   propulsive charge (TL) up to the distance of optimally before the lens.   3. Firing device according to the claim   2, characterized in that the value of the delay time before tripping (T) of the propellant charge (TL) is supplied to the firing circuit of the hollow pre-charge (VHL) by the operating circuit of the rangefinder to laser (LEM).   4. Firing device according to the claim   characterized by the fact that the firing of the   initial hollow charge (VHL) is triggered by a   close to him.   5. Firing device according to the claim   tion 1, characterized by the fact that the value of the   flight is calculated from the continuous measure of distance, or is provided by a memory in form   determined value before the mission.