WO2010058135A1

WO2010058135A1 - Method for simulating shooting and shooting simulator suitable for implementing the method

Info

Publication number: WO2010058135A1
Application number: PCT/FR2009/052233
Authority: WO
Inventors: Jérôme CÔTE-COLISSON; Pascal Viroux; Michel Fichoux
Original assignee: Gdi Simulation
Priority date: 2008-11-24
Filing date: 2009-11-20
Publication date: 2010-05-27
Also published as: FR2938961B1; FR2938961A1; EP2356397A1; EP2356397B1

Abstract

The invention relates to a method for simulating shooting using a simulation weapon (10) aimed at a target during combat training simulation. The invention uses a shooting simulator (20, 30) which can emit successive shot-simulating laser beams according to a combination of unidirectional and bidirectional communication protocols. Said emission is determined by the type of weapon being simulated. In this way, all combattants (11, 12, 13, 14) in a simulated shot impact area (18) can detect the shot and may or may not feel the effects thereof.

Description

Shot simulation method and shooting simulator adapted to implement the method

FIELD OF THE INVENTION The subject of the present invention is a method of simulating firing with a simulation weapon towards a target, during a simulation of combat training. The present invention finds a particularly advantageous, but not exclusive, application in the field of simulation for the technical and tactical training of crews in the context of field exercises in regiment or combat training center.

The invention also relates to a shot simulator comprising means capable of implementing the simulation method of the invention. State of the art Currently, during a technical or tactical combat training in the context of regiments or combat training centers, exercise players such as land vehicles, aircraft and pedestrian players are equipped with combat weapons such as missiles, rockets or small arms, associated with a firing simulator. The shooting simulator is intended to simulate a real shot of the combat weapon by laser technology.

The actors of the exercise are also provided with a target device intended to equip them with a target function allowing them to play a role of target, during the simulation of the training. During training, two types of shooting simulators are used.

One of the firing simulator types is a bidirectional simulator. It comprises an optical unit equipped with a non-dangerous low power laser transceiver secured to the combat weapon and its aiming system. This type of firing simulator is associated with a bidirectional target device fitted to certain combat actors. This target device comprises a computer provided with an interface for programming the target, a beacon equipped with an optical detection device for receiving the laser shot from the firing simulator, and an optical retroreflector device. reflecting the laser shot at the receiver of the optical block of the firing simulator. An alarm is triggered when the detector has received a laser shot. The bidirectional laser simulator equips for example missiles or weapons carried by tanks or helicopters.

The other type of firing simulator is a unidirectional simulator. It includes an optical unit equipped with a non-dangerous low-power laser transmitter attached to the combat weapon and its aiming system. This type of firing simulator is associated with a unidirectional target device fitted to other combat actors such as infantrymen. This target device comprises a computer provided with an interface for programming the target, a beacon equipped with an optical detection device for receiving the laser shot from the firing simulator and an alarm triggered when the detector has received a shot. laser. The unidirectional laser simulator equips individual portable weapons worn by soldiers such as infantrymen or commandos.

However, the communication protocols of these two types of firing simulator are incompatible. As a result, combat actors equipped with a unidirectional target device located in the line of sight of the bidirectional firing simulator do not detect the laser shots fired by them and vice versa. Thus, unidirectional or bidirectional target devices will not be affected by any simulated firing respectively by the unidirectional or bidirectional simulator regardless of the type of weapon simulated, which does not correspond to reality.

For example, a bidirectional firing simulator carried by a laser-emitting gun simulating the firing of an explosive ordnance will not be detected by any infantryman equipped with the unidirectional target device, located in the explosive area of the ammunition. Presentation of the invention

The purpose of the invention is precisely to make the result of the combat training simulation virtually coincide with the result of a real combat by overcoming the disadvantages of the techniques described above. For this, the invention implements a firing simulator capable of successively emitting laser radiation simulating firing according to the unidirectional and bidirectional communication protocol or vice versa. This emission is made according to the type of weapon to simulate. The invention thus allows all combat actors located in an impact zone of the simulated shot to detect it and to suffer or not the effects. More specifically, the subject of the invention is a method for simulating shots with a simulation weapon in which

the simulation weapon is pointed at a target equipped with a target device; a target presence verification message is fired with the simulation weapon towards said target;

then fires a first type on the target with the simulation weapon, the first type of fire having a firing message, characterized in that a firing of a second type is carried out after a date of firing. impact of a ballistic fire occurring after a ballistic duration, so as to simulate at least one point of impact in an impact perimeter determined according to the characteristics of the projectile.

Advantageously, the invention is also characterized in that the firing of the second type is repeated periodically after the impact date during a period of neutralization of additional targets.

the duration of neutralization of additional targets is determined according to a type of the simulation weapon.

Advantageously, the invention is also characterized in that the impact perimeter is determined before the firing of the first type is performed.

Advantageously, the invention is also characterized in that

- during the reiteration, the simulation weapon is placed in order to cover all the impact perimeter. Advantageously, the invention is also characterized in that

- the duration of neutralization corresponds to the time necessary to scan the perimeter of impact.

Advantageously, the invention is also characterized in that

the verification message includes a search phase with a two-dimensional scan, namely a horizontal scan and a vertical scan.

Advantageously, the invention is also characterized in that

the second type of fire occurs after a latency period succeeding the verification message or the firing message. Advantageously, the invention is also characterized in that the target device transmits, in response to the verification message, a presence message,

if the presence message is not received by the simulation weapon,

- a second type is fired after an impact date of a ballistic fire occurring after a ballistic duration,

the firing of the second type being directed to a corresponding impact location.

Advantageously, the invention is also characterized in that the firing of the first type is bidirectional. Advantageously, the invention is also characterized in that the firing of the second type is unidirectional.

Advantageously, the invention is also characterized in that

the firing of the second type comprises a transmission, twice contiguous in time, of a symbolic word of data followed by a period of silence whose duration is equal to the duration of the two contiguous words,

each word being formed of symbols of short duration separated from each other by an inter-symbol duration longer than the short duration.

Advantageously, the invention is also characterized in that one or more additional symbols are emitted during the period of silence at dates separated from the end of the second word by a duration equal to an odd multiple of the half-intersymbol time.

Advantageously, the invention is also characterized in that each word is formed of fourteen symbols framed by a start symbol and a stop symbol.

Advantageously, the invention is also characterized in that

the first symbol of the first word, the additional symbol and the last symbol of the second word are emitted with energy levels higher than those of the other symbols. Advantageously, the invention is also characterized in that

the fire message includes a transmission twice in time, a symbolic synchronization word,

- these two symbolic words of synchronization are separated by symbolic words of data relating to the simulated shooting, - these two symbolic words are followed by symbolic words extension of data relating to simulated fire,

Advantageously, the invention is also characterized in that - the first synchronization word is formed of nine symbols, the second synchronization word is formed of ten symbols.

Advantageously, the invention is also characterized in that each symbolic word of data is formed of eight symbols flanked by a separation bit. Advantageously, the invention is also characterized in that the inter symbol duration is more than 1000 times greater than the short duration.

Advantageously, the invention is also characterized in that the inter-symbol duration is about 128 μs and the duration of a symbol is at least 50 ns. Advantageously, the invention is also characterized in that the position of the additional symbols is about 320 μs, or about 448 μs or about 576 μs of the second stop symbol of the second word.

Advantageously, the invention is also characterized in that the symbol is a laser pulse. The subject of the invention is also a simulator comprising means capable of implementing the simulation method of the invention.

Brief description of the drawings

The invention will be better understood on reading the description which follows and on examining the figures which accompany it. These are presented as an indication and in no way limitative of the invention.

FIGS. 1a, 1b and 1c schematize a representation of a simulation of shots, during a training in combat, according to the invention.

FIG. 2 shows a schematic representation of the implementation of the components of the firing simulator according to the invention. Figure 3 shows an illustration of means implementing the method of the invention.

FIGS. 4 and 5 show an example of a unidirectional communication protocol between a firing simulator and a unidirectional target device, according to the invention. Figures 6, 7 and 8 show an example of a protocol of bidirectional communication between a firing simulator and a bidirectional target device, according to the invention.

Figures 9a, 9b and 9c illustrate the result of the interpretation of a unidirectional target device, when receiving data transmitted according to the unidirectional communication protocol.

DETAILED DESCRIPTION OF EMBODIMENTS OF THE INVENTION FIGS. 1a, 1b and 1c show a representation of a combat simulation of several combat actors on a training ground. In the example of Figure 1a, the actors in combat are composed of a tank 10, a helicopter 11 and three actors 12, 13 and 14 pedestrians such as infantrymen. All these combat actors are provided with a simulator 20 for firing a combat weapon as shown in Figure 2 and a target device (not shown).

The shooter, in the example of FIG. 1a, is the tank 10 armed with a barrel 15 whose aiming system is associated with the simulator 20 of firing a shell 16. The aiming system of the barrel 15 is associated to the axis of a laser rangefinder 21 of the firing simulator 20 and is pointed towards a target materialized by the pedestrian combat actor 13 situated at a horizontal distance from the tank 10. As represented in FIG. laser rangefinder 21 simulator

20 shots comprises a laser emitter 22, for example a laser diode, for producing low power laser pulses in the form of a light beam with a repetition frequency of a few kHz. The laser rangefinder 21 also includes a laser receiver 23, such as a light-sensitive diode. The firing simulator comprises a device 24 for scanning a laser beam emitted by the transmitter 22.

The firing simulator 20 is coupled to a control circuit 30 capable of triggering the emission of the laser beam by the transmitter 22, the activation of the scanning device 24 and the processing of the signals received by the receiver 23.

The firing simulator has a graphical human machine interface. This interface includes various descriptive titles whose provision guides the user in entering programming information of the firing function of the firing simulator. This interface 25 allows the user to configure and control the simulator 20 of tank fire 10.

The control circuit 30 comprises a microprocessor 31, a memory 32 of shot simulation program and a memory 33 of data interconnected by an internal bus 34. In the description, actions are attributed to devices or programs, that is to say that these actions are executed by a microprocessor of this apparatus or of the apparatus comprising the program, said microprocessor then being controlled by instruction codes stored in a memory of the device. These instruction codes make it possible to implement the means of the apparatus and thus to carry out the action undertaken.

The firing program memory 32 is divided into several zones, each zone corresponding to a function or mode of operation of the program of the firing simulator. A zone 35 includes instruction codes for processing the information entered on the interface 25 and activating the firing function of the firing simulator as a result of user validation of that input.

A zone 36 includes instruction codes for simulating a trajectory T of a ballistic behavior of the simulated munition, which is here the shell 16, depending on the type of ammunition. A zone 37 includes instruction codes for activating the scanning device 24, when transmitting a firing of a first type comprising a verification message sent by the transmitter 22. A zone 38 comprises instruction codes to determine an impact location and a ballistic duration based on the data received in response to the verification message.

A zone 39 includes instruction codes for determining an impact perimeter around the impact location depending on the type of munition to be simulated. Area 40 includes instruction codes for determining a combination of laser shot transmissions according to a unidirectional communication protocol, as shown in FIGS. 4 and 5, and a bidirectional communication protocol, as shown in FIGS. 8. The sequence combination of laser shots is determined based on the data received in response to the verification message. A zone 41 includes instruction codes to detach the axis of sight of the weapon to scan the perimeter of impact. An area 42 includes instruction codes to determine the number of laser fire emissions based on the type of ammunition.

During simulation of the firing of the shell 16, the axis of view of the tank 10 and the axis of the rangefinder 21 are pointed in the direction in which the target is located, which is here the pedestrian actor 13. In a first time, the control circuit 30 determines the parameters of the shot in order to simulate in time a ballistic behavior of the shell 16. The parameters of the shot can be in particular the temperature of the powder, the aerological conditions, the winds, the movements of the shooter at the moment of firing and during the simulation of the trajectory T of the projectile 16 etc.

Then, the control circuit 30 determines the imaginary trajectory T representative of the trajectory of the simulated shell 16. This trajectory T is developed in real time from, in particular, the gun pointing parameters and the ballistic behavior of the simulated shell 16. The fictitious trajectory T of the simulated shell 16 is known at each instant (ti) by tables or by calculation. The simulated trajectory T thus allows the control circuit 30 to create a relationship between a distance traveled by the munition and the time ti.

In a second step, the circuit 30 simultaneously controls the emission of a firing of a first type simulating the shell 16 and the activation of the scanning device 44. The firing of the first type comprises at this moment a bi-directional target device presence verification message on the trajectory T. The activation of the scanning device 44 makes it possible to carry out a displacement of the emitted laser beam along the trajectory T so as to explore a certain field to observe the area where the pedestrian actor is. This scan represents a simulation in time of the laser shot to represent the ballistic behavior of the simulated shell 16.

The displacement of the laser beam along the path T made by the scanning device 44 is preferably a scanning in two dimensions, namely a scan along a horizontal axis or "bearing" and a scan along a vertical axis or "site".

As soon as the receiver 23 receives a presence message in response to the verification message corresponding to the laser beam emitted during the scanning, the control circuit 30 deactivates the scanning device 24. In the example of FIG. 1, the bidirectional target device equipping the helicopter 11, located in the scanning field, detects the presence verification laser beam. A reflector of this bidirectional target device re-emits the received laser beam to the simulator 20. The control circuit 30 measures the time offset corresponding to the distance away from the helicopter 11 of the shooter 10. The measurement of this time shift makes it possible to determine a place of impact 17 of the simulated shell 16. This time difference corresponds to the ballistic duration.

The control circuit 30 determines the characteristics of the projectile to be simulated, here the shell 16. These characteristics allow the circuit 30 to define dimensions of an impact perimeter 18 surrounding the impact location 17. Characteristics may include a scatter zone of the impact points, the target altitude and a blast effect corresponding to a blast wave created by the detonation of the shell. This zone of dispersion of the points of impact can be generated by a cluster bomb or a cluster bomb.

When the weapon to be simulated is a light weapon, carried by the pedestrian actors, such as a machine gun, the impact perimeter corresponds to the place of impact aligned with the axis of aim of the weapon to be simulated before firing. laser.

After having determined the impact perimeter 18, the circuit 30 controls the emission of the firing of the first type, this time comprising a firing message towards the helicopter 11. This firing message is issued according to a communication protocol. bidirectional illustrated in Figures 6-8.

In order to simulate impact points in the impact perimeter, the circuit 30 controls the emission of shots of the second type. For each transmission, the circuit 30 controls the misalignment of the axis of sight of the gun to cover the entire perimeter 18 of impact. The firing of the second type is issued according to a unidirectional communication protocol illustrated by FIGS. 4 and 5. This firing of the second type is reiterated during a period of neutralization of additional targets. This duration of neutralization corresponds to the time necessary for the simulator to scan the perimeter of impact. The misalignment of the gun is done according to a previously defined distribution of the points of impact.

Thus, with the invention, not only will the helicopter be declared as touched but also all the other actors, such as the actor 12, located in the impact environment of the fired projectile. The invention thus makes it possible to match the result of the simulation in combat training to reality.

In the example of FIG. 1b, the actors in combat are composed of the shooter tank, a second tank 9, the pedestrian actor 13 considered as the target target and two other actors 12 and 14 pedestrians such as infantrymen.

The bidirectional target device equipping the second tank 9, located in the scanning field, detects the presence verification laser beam. A reflector of this bidirectional target device re-emits the received laser beam to the simulator 20. The control circuit 30 measures the time offset corresponding to the distance of distance of the second tank 9 between the transmission of the verification message and the reception of the response to this message. The measurement of this time shift makes it possible to determine an impact location 17 of the simulated shell 16.

The control circuit 30 determines the dimensions of the impact perimeter 18 surrounding the impact location, depending on the characteristics of the projectile. Then, the circuit 30 controls the emission of the firing of the first type comprising a firing message towards the second tank 9. In order to simulate impact points 19 in the perimeter 18 of impact, the circuit 30 controls the emission firing of the second type by offending at each transmission the laser emission axis of the optical block (20).

In the example of FIG. 1c, the actors in combat are composed of the shooter tank, the pedestrian actor 13 considered as the target target and the pedestrian actor 14. In the example of FIG. the simulator 20 receives no response to the presence check message during the scan time of the trajectory T. In other words, no actor in combat equipped with the bidirectional target device is in the scanning field. In this case, the firing of the second type is carried out after an impact date of a ballistic fire occurring at the end of the sweep of the trajectory T. This impact date coincides with the impact location 17 corresponding to the point user-targeted impact before the simulation. This impact location corresponds to the position of the target target which is here the pedestrian actor 13. The control circuit 30 determines the dimensions of the impact perimeter surrounding the impact location, depending on the characteristics of the projectile. Then, the circuit 30 controls the emission of shots of the second type by offending at each transmission the axis of sight of the gun.

The shooting of the first type with a fire message is not activated in this case. Nevertheless, the activation of the emission of the firing message has no effect on the result of the simulation because no bidirectional target device is present on the trajectory T of the projectile 16 to receive it.

Figure 3 shows an illustration of means implementing the method of the invention. FIG. 3 shows a preliminary step in which the firing function of the simulator 20 is activated according to the data entered on the graphical interface. At a step 101, depending on the type of projectile to be simulated, the control circuit 30 extracts from the data memory 33 attributes associated with this projectile. These attributes include, the maximum range of this projectile, the number of ammunition fired continuously. At a step 102, the control circuit 30 calculates a distance separating the shooter from the target. At a step 103, the control circuit 30 simulates a trajectory T of a ballistic behavior of the simulated munition.

At a step 104, the laser transmitter 22 emits a laser shot of a first type comprising a verification message simulating an ammunition of the simulation weapon. This verification message comprises a set of laser pulses making it possible to search for any bidirectional targets present along the simulated trajectory T. The laser shot is moved along the path T to explore a certain field to detect the possible presence of target. In a step 105, the firing simulator 20 is in the listening phase of a signal transmitted by a reflector of a bidirectional laser target device in response to the verification message (search). This listening phase is triggered by the control circuit 13 by launching a countdown counter at a step 106, the duration of which is almost equal to a duration of a laser shot. This duration of a laser shot, previously defined, is generally of the order of tens to hundreds of milliseconds. The outcome of the listening phase can be obtained either when the countdown timer reaches zero or when the receiver 23 of the simulator receives a response.

At a step 107, the simulator 20 receives a presence signaling message from a target in response to the presence check message issued, during the duration of the listening phase. In a step 108, the control circuit 30 stops the countdown timer and deactivates the scanning device. In a step 109, the control circuit 30 determines the impact location of the projectile by measuring the distance of distance between the shooter and the target.

At a step 110, the control circuit 30 determines the characteristics of the projectile to be simulated in order to calculate the dimensions of the impact perimeter 18 surrounding the impact location 17. At a step 111, the firing simulator fires the first type firing with a firing message towards the target provided with the bidirectional target device. At a step 112, in order to simulate impact points in the impact perimeter 18, the firing simulator 20 emits firing of the second type by detaching at each transmission the laser emission axis of the simulator.

If the countdown timer reaches zero and the receiver 23 has not received a presence signaling message, the control circuit 30 considers, at a step 113, that the location of impact corresponds to the point of impact. targeted by the shooter.

At a step 114, the control circuit 30 determines the dimensions of the impact perimeter 18 surrounding this location of impact, depending on the characteristics of the projectile. At a step 115, the transmitter 22 emits firing of the second type by detaching at each transmission the laser emission axis of the simulator to cover the perimeter 18 of impact.

In a preferred embodiment, the wavelength of the laser radiation emitted by the firing function of the simulator is between 880 nanometers and 920 nanometers. This laser emission comprises symbols having a duration preferably greater than or equal to approximately 50 nanoseconds. In a preferred embodiment, the duration of a symbol is substantially equal to 110 nanoseconds. A symbol is a laser pulse. The transmission of laser data, via this transmission, is unidirectional and asynchronous between the shooter and its target.

The maximum power level of the laser pulses emitted by the shooter is determined in accordance with the eye safety standard of laser devices.

The transmission of the data relating to the firing carried out, from the firer to the target, is effected by modulating the laser symbol train in all or nothing. This modulation is preferably a pulse code modulation type binary modulation known as the Anglo-Saxon term of Puise Coded Modulation (PCM). In a preferred embodiment, the intersymbol duration is equal to about 128 μs with a tolerance of ± 5 μs. With this modulation:

"1" will be encoded by the presence of a laser pulse

"0" will be encoded by the absence of a laser pulse.

The laser data transmission is done according to the unidirectional or bidirectional communication protocol. A communication protocol is a set of rules and procedures defining the type of coding, the speed used during the communication, and how to establish and terminate the connection.

FIGS. 4 and 5 show an example of a unidirectional communication protocol between a firing simulator and a unidirectional target device, according to the invention.

In data transmission mode, according to the unidirectional communication protocol, the firing simulator issues a firing 50 of second type. This firing 50 of the second type comprises 63 successive bits organized in the following manner: a first word of 14 data symbols flanked by a starting symbol 52 and a stopping symbol 53;

a second 54 word of 14 data symbols identical and contiguous to the first word and flanked by a start symbol 55 and a stop symbol 56, and a silence period whose duration is equal to to the duration of the two contiguous words. This silence period consists of 31 consecutive bits forced to 0, ie 32 consecutive inter-symbol durations of 128 μs.

The start and stop symbols 52, 53, 55, 56 are synchronization bits. The word of 14 symbols includes data relating to the identification of the gunman, the type of weapon or ammunition used or the family of the weapon used (caliber) and in some cases provides information on the sanction to display. by the target.

The total duration of a firing of the second type issued at a fixed period of 128μs is 8,064 ms from the first laser symbol issued. In the state of the art, to determine if a target is taken part, the data received by the target are transmitted to a central computer management training simulation. This computer determines whether the target is destroyed, hit, or engaged by that shot based on the impact point and vulnerability criteria of that target.

In the invention, to allow a calculator of the target to automatically determine its sanction, at least one additional symbol 59 is emitted during the period 57 of silence of the firing 50 of the second type. This additional symbol 59 is issued at a duration of the symbol 56 end of the second 54 word equal to an odd multiple of the half inter-symbol duration. This additional symbol 59 is a laser pulse allowing the target to display a sanction of the type taken together. When the target receives the additional symbol 59, it can automatically conclude that it is not destroyed by this shot but only present in the firing zone without suffering the effects. With the invention, it is thus no longer necessary to transmit the data to a central computer to determine the penalty to be applied to the target.

In a preferred embodiment, the set-to-part symbol may be 320 μs after the stop sign 56 of the second word, 448 μs after the stop symbol 56 of the second bit word or 556 μs after the symbol 56 stopping the second word.

In the invention, the start symbols 52 of the first word and the stop word 56 of the second word as well as the additional symbol 59 are transmitted at higher energy levels than the other symbols transmitted. In a preferred example, the start symbols 52 of the first word, stop 56 of the second word and the additional symbol 59 are transmitted at energy levels approximately 2 times higher than those of the other symbols transmitted.

To represent the simulation of a fired ammunition, the transmitter emits a firing sequence 58. This sequence of shots includes identical and consecutive second type shots. In a preferred embodiment m is between one and six. In the example of FIG. 5, to simulate the firing of a single ammunition, the firing simulator emits a firing sequence comprising 3 identical and consecutive shots of the second type. In a preferred example, the duration of a firing sequence is at most 50 milliseconds. The emission redundancy of the 14-bit word and the firing of the second type makes it possible to avoid transmission errors in order to ensure the reliability of the information received. This redundancy allows the target receiving the transmission to control the integrity of the data received. When, the type of weapon is a burst weapon of "n" shots, n being a positive integer, the simulation of a shot is translated by the laser emission of n sequences of successive shots. Each firing sequence is issued at the impact location of each simulated munition. The sequence of shots of fact to the rhythm of the shots of the n shots of the weapon. To simulate the points of impact of an explosive weapon and its lethal zone, the transmitter 21 continuously emits spatially distributed shot sequences to describe a rectangular area of lethality. The spatial dimensions of this area are a function of the type of simulated munition, and are metrically constant regardless of the distance between the shooter and the target. For this type of data transmission, the sequences of 50 ms can not be respected any more and the firing of second type are transmitted consecutively and without interruption during all the scanning of the zone of lethal coverage.

Figures 9a, 9b and 9c illustrate the interpretations made by the calculator of the target when it receives a firing sequence. When the target receives the high energy symbols, it can interpret the received data and report being hit as shown in Figure 9a. When the target receives a high energy symbol at a duration of the second word stop symbol 56 equal to an odd multiple of the intersymbol half time then, as shown in Fig. 9b, the target calculator interprets the data received and declares itself taken by fire. In the example of Figure 9c, the shot is interpreted as missed because it is not detected by the target.

FIGS. 6-8 show an example of bidirectional communication protocol between a firing simulator and a bidirectional target device, according to the invention.

In data transmission mode, according to the bidirectional communication protocol, the firing simulator transmits a message 60 of shots of a firing of the first type. This shot message has 84 symbols including 55 standard symbols and 29 extension symbols. The symbols of the shot message 60 are transmitted successively and organized from the illustrated in Figure 6.

The shot message 60 comprises a synchronization header 61, as illustrated in FIG. 7. This synchronization header 61 has 9 consecutive symbols. This header 61 is followed by five bytes 63. These five bytes 63 are followed by a new synchronization header 62. This synchronization header 62 comprises ten consecutively transmitted symbols. This synchronization header 62 is followed by two extension bytes 64. The bytes representing the useful data relating to the shot are framed by periods of silence. These periods of silence correspond to bits called "0" of separation.

These two synchronization headers 61 and 62 which surround the five bytes of data allow the target to recognize the five bytes of the standard part and the two complementary bytes constituting the extension.

In a preferred embodiment, the bytes of the five standard bytes 63 may include in particular the following data:

Table 1

In a preferred embodiment, the bytes of the two extension bytes 64 may include in particular the following data:

bytes Data

Shooter's Participant Code Extension to 1023

6 participants

Ammunition Type Extension to 136 Types

Shooter's Code Extension to 2047

7 participants

Ammunition Type Extension to 136 Types

Table 2 The total duration of a message 60 of shots issued at a fixed period of 128 μs is 10.624 ms from the first laser symbol transmitted.

To represent the simulation of a fired ammunition, the transmitter emits a firing sequence. This sequence of shots includes 60 identical and consecutive shots. In a preferred embodiment m is between 1 and 28. The total duration of the emission of a firing message shot sequence is 300.928 ms for a fixed inter-symbol duration of 128 μs. data transmission, including

28 messages 60 firing, is triggered for each shot fired by the simulated weapon following the detection of a response to the verification message issued by a bidirectional cooperating target.

In the case of data transmission relating to a fired burst, the number of shots in the burst is included in the information coded in the message 60 shots. In a preferred embodiment, this number of strokes is limited to 15.

In the case of simulating a burst with an unlimited number of shots, the control circuit 30 creates shot messages each having a number of shots limited to 15. The circuit 30 thus successively breaks down the simulated burst into messages 60. separate shots each with not more than 15 shots fired.

In order to avoid interleaving between the firing of the second type and the firing message, the firing of the first type occurs after a latency period succeeding the verification message or the firing message. This latency period is a latency time without laser emission. It is greater than five milliseconds.

Claims

1 - Simulation method of firing a projectile with a simulation weapon (10) in which the simulation weapon is pointed in the direction (13) of a target equipped with a target device,

a target presence verification message is fired with the simulation weapon towards said target,

- then fires (104) of a first type on the target with the simulation weapon, the first type of shooting comprising a firing message (111), characterized in that

a firing of a second type (112, 115) is carried out after an impact date (17) of a ballistic fire occurring after a ballistic duration (D), so as to simulate at least one point of impact in a perimeter (18) of impact determined according to the characteristics of the projectile.

2 - Process according to claim 1, characterized in that

the second type is repeated periodically after the impact date during a period of neutralization of additional targets,

3 - Process according to claim 2, characterized in that the impact perimeter is determined before the first type of firing is performed.

4 - Method according to one of claims 2 to 3, characterized in that

- During the reiteration, we detach (41) the simulation weapon, so as to cover all the perimeter of impact.

5 - Method according to one of claims 2 to 4, characterized in that - the duration of neutralization corresponds to the time required to scan the perimeter impact.

6 - Process according to one of claims 1 to 5, characterized in that

the verification message comprises a search phase with a scan (37) in two dimensions, namely a horizontal scan and a vertical scanning.

7 - Method according to one of claims 1 to 6, characterized in that

the second type of fire occurs after a latency period succeeding the verification message or the firing message.

8 - Process according to one of claims 1 to 7, characterized in that

the target device transmits (107) in response to the verification message a presence message, if the presence message is not received by the simulation weapon,

a second type is fired (115) after an impact date of a ballistic fire occurring after a ballistic duration,

the firing of the second type being directed to a location (113) of corresponding impact. 9 - Method according to one of claims 1 to 8, characterized in that the firing of the first type is bidirectional.

10 - Method according to one of claims 1 to 9, characterized in that the firing of the second type is unidirectional.

11 - Method according to one of claims 1 to 10, characterized in that

the firing of second type comprises a transmission, twice contiguous in time, of a symbolic word (51, 54) of data followed by a period (57) of silence whose duration is equal to the duration of the two contiguous words, - each word being formed of symbols of short duration separated from each other by inter symbol duration longer than the short duration.

12 - Process according to claim 11, characterized in that

one or more additional symbols (59) are emitted during the period of silence at dates separated from the end of the second word by a duration equal to an odd multiple of the intersymbol half-duration.

13 - Method according to one of claims 11 to 12, characterized in that each word is formed of fourteen symbols framed by a start symbol (52, 55) and a stop symbol (53, 56).

14 - Method according to claim 13, characterized in that: - the first symbol (52) of the first word, the additional symbol (59) and the last symbol (56) of the second word are emitted with higher energy levels than the other symbols,

15 - Method according to one of claims 1 to 10, characterized in that - the firing message comprises a transmission twice in time, a symbolic word (61, 62) of synchronization,

these two symbolic synchronization words are separated by symbolic words (63) of data relating to the simulated fire,

these two symbolic words are followed by symbolic words of extension (64) of data relating to the simulated shooting,

16 - Process according to claim 15, characterized in that:

- The first synchronization word is formed of nine symbols, the second synchronization word is formed of ten symbols.

17 - Method according to one of claims 11 to 15, characterized in that each symbolic word of data is formed of eight symbols framed by a separation bit.

18 - Method according to one of claims 11 to 17, characterized in that the inter symbol time is more than 1000 times greater than the short duration.

19 - Method according to one of claims 11 to 18, characterized in that the inter-symbol duration is about 128 microseconds and the duration of a symbol is at least 50 ns. 20 - Method according to claim 19, characterized in that the position of the additional symbols is about 320μs, or about 448μs or about 576μs of the second stop symbol of the second word.

21 - Method according to one of claims 11 to 20, characterized in that the symbol is a laser pulse. 22 - Simulator comprising means capable of implementing the shot simulation method according to one of the preceding claims.