JP2003185400A - Unexploded shell detecting equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an unexploded shell detecting equipment which surely determines whether or not a landed shell was exploded. <P>SOLUTION: The unexploded shell detecting equipment is constituted of a firing sound sensor 3 which measures sound pressure of sound generated when a tank 1 fires a bullet from a machine gun to a target 13, a landing sound sensor 5 which measures sound pressure of sound generated when the bullet lands a landing bank 14 at the rear of the target 13, and a T-bar sensor unit 6 which measures the position where a bullet is passing, a control system 7 which has a means to determine whether or not a landing sound value measured by the landing sound sensor 5 exceeds a designated threshold value for landing sound pressure, and an analysis/display unit 4 which is connected to the control system 7 with or without wires, and analyzes and displays the status of a bullet such as being fired, landed, or exploded. Whether or not the measured landing sound value exceeds the threshold value for the landing sound pressure determines whether a landed bullet was exploded or not. <P>COPYRIGHT: (C)2003,JPO

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unexploded ordnance detection device.
Especially at machine gun firing ranges without landing and rupture.
Regarding an unexploded ordnance detection device that determines the presence or absence of
I do. [0002] 2. Description of the Related Art Fire training in a cannon firing range
To determine if the bullet that landed is an unexploded or exploding bullet.
In the prior art, humans land using telephoto from the shooting position.
The position was observed and the presence or absence of rupture was determined. [0003] SUMMARY OF THE INVENTION In the above prior art,
In some cases, when a bullet hits a target, the bullet
As it penetrates and lands on the brace behind the target,
The dot is hidden behind the target and cannot be seen, its bullet
The problem is that it is difficult to visually determine whether
there were. [0004] One target from one of a plurality of cannons is used.
In case of salvo fire, multiple bullets arrive in a very short time.
Because it may bounce, it can be determined by visual observation
There was also a problem that the determination became difficult. [0005] As described above, the impact at the machine gun firing range
Conventional technology for determining whether a bullet that has been exploded or exploded
In, the measurement of the impact and the salvo fire hidden behind the target
No consideration was given to impact measurement regarding
That it is difficult to reliably determine
There was a title. An object of the present invention is to solve the above problems,
Failure to reliably determine the presence or absence of unexploded bullets
An object of the present invention is to provide an impact detection device. [0007] [MEANS FOR SOLVING THE PROBLEMS]
In addition, the present invention provides a machine gun firing range as set forth in claim 1.
A device for detecting unexploded ordnance in
A landing sound sensor that measures the sound pressure of the sound generated when a round impact is applied
And the measured landing sound pressure value output from the landing sound sensor is
Judgment method for judging whether or not a certain impact sound pressure threshold value is exceeded
And an unexploded bomb detection device characterized by having a step.
You. [0008] DESCRIPTION OF THE PREFERRED EMBODIMENTS In an embodiment of the present invention,
Judgment of whether the landed bullet is ruptured or unexploded by sound pressure measurement
Therefore, an unexploded ordnance detection device that detects unexploded ordnance
Constitute. That is, in the embodiment of the present invention,
A landing sound sensor that measures the sound pressure of the sound generated when a bullet lands
And the measured landing sound pressure value output from the landing sound sensor is
Judgment method for judging whether or not a certain impact sound pressure threshold value is exceeded
And an unexploded ordnance detecting device having a step. The unexploded ordnance detection device according to the present invention includes, for example,
The sound pressure generated when a bullet is fired
A firing sound sensor to be measured and a bullet attached near the target
A landing sound sensor that measures the sound pressure of the sound generated during a bullet
When the measured landing sound pressure value, which is the output of the landing sound sensor,
Determining means for determining whether or not a bullet pressure threshold is exceeded;
The output of the emission sound sensor and the determination result by the determination unit
And an analyzer that detects the presence of unexploded ordnance
You. In this unexploded ordnance detection device, the firing sound sensor
The number of bullets fired is counted from the output of
The landing sound pressure measurement output is a predetermined landing sound pressure threshold.
The number of bullet ruptures is measured from the number of times exceeded, the number of bullets fired
From the difference between the number of bullets and the number of unexploded ordnance,
The number of unexploded bombs is detected (when there are unexploded bombs). [0010] Not only the presence and number of unexploded ordnance, but also
The following is an example of an embodiment in which the position can be known. FIG. 1 is a block diagram showing an embodiment of the present invention.
When the bullet detection device is installed at the gun shooting range,
FIG. In the figure, a tank 1 is a bullet from a cannon 2
When you fire a bullet, the sound pressure of the sound generated when the bullet is fired
The firing sound sensor 3 to be measured and the firing sound sensor 3
The analysis / display unit 4 that stores the detected time is a tank
1 is installed near. Also, at the bottom of the target 13,
A shot fired at a location protected from bombardment by the protection dike 15
The circle passes through the trajectory shown by the broken line in FIG.
Measure the sound pressure of the sound generated when landing on the landing shore 14
Impact sound sensor 5 and a T-bar for measuring a bullet passing position.
-The sensor unit 6 and the control device 7 are installed
You. The firing sound sensor 3 is indicated by “Sound pressure measurement range” in FIG.
The sound pressure of the sound generated in the range (enclosed by the broken line)
It can be measured. Control with analysis / display unit 4
The connection with the control device 7 is wirelessly or wiredly connected.
Data and control commands are exchanged through the connection.
Launch sound sensor 3, analysis / display unit 4, impact sound sensor
5, T bar sensor unit 6 and control device 7
It is a component of such an unexploded ordnance detection device. Impact sound center
The measured landing sound pressure value output from the sensor 5 is a predetermined landing sound pressure.
The judgment means for judging whether or not the threshold value is exceeded is analyzed / displayed.
It is incorporated in the unit 4 or the control device 7. Book
In the embodiment, this determination means is provided to the control device 7.
It shall be incorporated. FIG. 2 shows a landing sound sensor 5 and a T-bar sensor unit.
FIG. 2 is an enlarged view of a knit 6 and a control device 7. T bar
The sensor unit 6 measures the bullet speed and the bullet passage position.
Four sound pressure sensors 8 to 11 for measuring and the temperature sensor 1
2 are arranged. For T-bar sensor unit 6
The direction in which the bullet comes in is indicated by a dashed arrow in FIG. FIG. 3 shows the arrangement of sound pressure sensors 8 to 11 and bullets.
20 shows the relationship with the flight direction of No. 20. The position of the sound pressure sensor 8
With the origin as the origin and the z-axis in the direction opposite to the
When the x-axis is horizontal, the sound pressure sensors 9 and 10
Equidistant from the origin on the axis (this distance is D_LPosition)
And the sound pressure sensor 11 is fixed on the z-axis from the origin.
Distance (this distance is D_F). The shock wave 16 generated by the bullet 20 is a sound pressure sensor.
Detected by sensors 8-11. At that time, the sensors 8 to
11 is recorded, the detected time is recorded.
From the detection time, the speed of the bullet 20, the bullet in the xy plane
20 (the point P (x in FIG. 3)_B, y_B, 0) etc.
Can be calculated. Diagram of the flow of such calculations
It is shown in FIG. First, the velocity V of the bullet 20 is given by the following equation (1).
Is calculated. [0016]         V = D_F/ Δt₃                              (1) Where Δt₃Is the sound pressure detection time t8 of the sensor 8.
And the sound pressure detection time t11 of the sensor 11
Also, it is the shock wave propagation time difference in the −z direction. That is, Δt
₃ = T8-t11. D_F Unit of m, Δt₃of
If the unit is s, the unit of V is m / s. Next, the passage of the bullet 20 in the xy plane
Position P (x_B, y_B, 0) will be described. First, the temperature was measured by the temperature sensor 12.
Using the temperature t (unit: ° C), the sound velocity C
(Unit is m / s). [0019]         C = 331.5 + 0.6t (2) As shown in FIG. 5, the velocity V of the bullet 20, the sound velocity C, and the impact
C = V sin θ between the wave cone angle θ
If V and C are determined from the equation, θ becomes
It is determined. Also, as shown in FIG.
The propagation velocity α of the shock wave 21 in a vertical plane is given by the following equation.
It is represented by (3). [0020]         α = Vtanθ = VC / (V²-C²)^1/2    (3) The bullet 20 is moved to a point P (x_B, y_B, 0)
The shock wave generated at the time of
9 and the sensor 10 and are detected as sound pressure. So
In the case of, the shock wave is applied to the sensor 8, the sensor 9, and the sensor 10.
Are detected as t8, t9, and t10, respectively.
And Δt₁ = T9−t8, Δt₂ = T8-t10
Then, the equation: (distance from point P to sensor 9) − (point P
From sensor to sensor 8) = αΔt₁, And the equation:
(Distance from point P to sensor 8) − (point P to sensor 1)
0) = αΔt₂ Holds. These equations, as shown in FIG.
Position of the sensor 8 (0,0,0) and the position of the sensor 9 (D_L, 0,
0) and the hyperbola β₁, And the position of the sensor 10
(-D_L, 0,0) and the position (0,0,0) of the sensor 8
Hyperbolic β to be the focus₂And the intersection of the two hyperbolas
Is the passing position P (x_B, y _B,
0), the measured values at t8, t9, t10
Find the above two equations and solve the equations simultaneously.
And x_B, Y_B By calculating the value of
Passing position P (x_B, y_B, 0)
You. Specifically, the hyperbola β₁ Is the equation: (x-D_L/ 2)²/ (αΔt₁/ 2)²-y²/ (D_L ²-(αΔ
t₁/ 2)²) = 1 And the hyperbola β₂ Is the equation: (x + D_L/ 2)²/ (αΔt₂/ 2)²-y²/ (D_L ²-(αΔ
t₂/ 2)²) = 1 , So that these two equations can be used simultaneously
System of equations (in this case, the system of equations can be solved analytically
And solve it to get x_B, Y_B Find the value of
Can be. As described above, the T-bar sensor unit
From the bullet passage position and passage time detected by 6
Predicts the landing location of the pier 14 and the impact sound sensor
5. Determine the timing of sound pressure measurement in Step 5. The impact sound sensor 5 is determined as described above.
At the time of the measured sound pressure measurement, a bullet fires at the time of impact
Measure the sound pressure of the sound. Measured when a bullet ruptures
Measured when sound pressure and bullets are unexploded without exploding
There is a large difference between the sound pressure and the impact sound pressure threshold.
Set the value to be between these two sound pressures
For example, the landing sound pressure measurement value output from the landing sound sensor 5 is
Whether the bullet ruptured, depending on whether the threshold was exceeded
It is possible to determine whether or not an unexploded bomb has been exploded. FIG. 7 shows the sound pressure measurement characteristics of the landing sound sensor 5.
The vertical axis indicates the sound of the impact when a bullet lands.
The sound pressure level received by the sensor 5 is set as S, and the horizontal axis is the impact sound sensor.
The distance L between the satellite 5 and the impact sound generation location is set. Bullet
When ruptured, the relationship between sound pressure level S and distance L is
It is represented by the following equation (4). [0025]         S = a₀/ L² + B₀                              (4) Where a₀, B₀Is a constant. If the object to be monitored is far and L is large,
The measured value of the landing sound pressure, which is the output of the bullet sensor 5, is a predetermined landing
The sound pressure level that determines whether the sound pressure threshold is exceeded
Set the threshold low and count the number of burst munitions. Sound pressure level
The threshold of the sound is backed by the reverberation and wind sound of other bullets.
Because ground noise (BGN) level changes, AG
Normally by C (automatic gain control)
BGN is smoothed to detect only sudden changes
are doing. Explosives can be very large in the case of explosives
There is a popping sound, but in the case of an unexploded bomb, only a falling sound and a small sound
It is. Therefore, whether it is a blast or not depends on the expected landing position.
Considering the attenuation due to the distance from the
The threshold of the pressure level is determined and the judgment is made. For example, figure
As shown in Fig. 7, the threshold value is set to three times BGN.
The distance L at which such sound pressure is measured₃Shorter distance than
It is possible to determine the separation L. Longer distance
If it is also necessary to make a judgment at
Is set to 1.8 times BGN, and such sound pressure is measured.
Distance L_1.8Judgment is possible for distance L shorter than
Function. The attenuation of sound pressure level with distance is
Correction calculation is performed because it differs depending on the wind strength and direction.
And This is the output of the landing sound sensor 5.
Determines whether the impact sound pressure measurement value has exceeded a predetermined threshold
Is determined by the control device as in the present embodiment.
7 or the analysis / display unit 4
May be incorporated in Analyze / display this judgment means
If it has been incorporated in the unit 4, the above judgment
Necessary measurement data is transmitted through wireless or wired connection.
First, it is sent from the control device 7 to the analysis / display unit 4,
If the judgment means is incorporated in the control device 7,
This determination is made in the control device 7, and as a result,
That is, landing position, landing time, judgment result of explosion or non-explosion, etc.
However, through the connection described above, the analysis / display unit is
Sent to knit 4. In the analysis / display unit 4, a bullet
Since the firing time is stored, the data
Data and the data of the judgment result at the time of impact described above.
The impact position of each fired bullet, bursting
It is possible to analyze the distinction of
Can be displayed. In this way, the bullet hits the target 13
Then, the impact position is hidden by the target 13 and it is judged
Individual bullets, including when it is difficult to visually determine
The position of the bullet, the distinction between explosion and misfire, etc. can be known reliably.
You. FIG. 8 is a diagram showing a single target 13
When firing from the cannon 2 of a number of tanks 1
1 shows an embodiment of the present invention. As shown in the figure
Thus, in the present embodiment, the previous embodiment shown in FIG.
In addition to the components in the embodiment, each of the plurality of cannons 2
Bullet based on the output of the sound sensor 3 installed in the vicinity
Control unit 7 transmits firing data (firing time, cannon number, etc.)
A communication unit 16 for transmitting the information is provided.
Wireless communication between each communication unit 16 and the control device 7
Connected, and data transmission takes place through this connection.
Is The control unit 7 determines the bullet firing time and the gun number
Data from the communication unit 16 and
Know the coming direction and predict the time of arrival of the bullet. Bullet coming
The direction is the velocity V of the bullet and the passing position (x_B, y_B, 0)
Used for correction when calculating. Flying at the predicted time
The impact position and impact time of the bullet
Is measured by the combination of
The determination of the tear or non-explosion is made by the impact sound sensor 5 and the control device 7.
It is done by combination. In the analysis / display unit 4,
The firing data (firing time, cannon number, etc.)
Is entered and stored, so at the time of such a launch
Data and the data of the judgment result at the time of impact
By contrast, the individual bullets fired by each cannon 2
It is possible to analyze the impact position of the circle, the distinction between burst and misfire, etc.
And the analysis result can be displayed. In this manner, a plurality of cannons 2
When firing all at the target 13, each cannon 2
Impact location of each bullet fired by the gun, whether it is burst or unexploded
Etc. can be surely known. [0034] As described above, according to the present invention, a bullet bag that has landed
An unexploded ordnance detection device that reliably determines the presence or absence of unexploded ordnance
Can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a configuration example of an unexploded ordnance detection device according to the present invention. FIG. 2 is a diagram showing a sensor arrangement near a target. FIG. 3 is a diagram showing the relationship between the arrangement of a sound pressure sensor and the direction in which a bullet comes in; FIG. 4 is a flowchart of calculation for calculating a bullet passing position and the like. FIG. 5 is a diagram for explaining a method of calculating a velocity of a bullet and a propagation velocity of a shock wave. FIG. 6 is a diagram illustrating a method of calculating a passage position of a bullet. FIG. 7 is a diagram illustrating a relationship between a sound pressure level S received by an impact sound sensor when a bullet ruptures and a distance L between the impact sound sensor and a location where the impact sound is generated. FIG. 8 is a diagram illustrating a configuration example of the unexploded shell detection device according to the present invention when simultaneous firing is performed by a plurality of cannons. [Description of Signs] 1 ... Tank, 2 ... Cannon, 3 ... Sound sensor, 4 ... Analysis /
Display unit, 5: Impact sound sensor, 6: T-bar sensor unit, 7: Control device, 8-11: Sound pressure sensor, 12:
Temperature sensor, 13: target, 14: bullet embankment, 15: protective embankment, 16: communication unit, 20: bullet, 21: shock wave.

Claims (1)

Claims: 1. An unexploded ordnance detection device for detecting an unexploded ordnance in a cannon firing range, wherein the impact sound sensor measures sound pressure of a sound generated when a bullet lands, and the impact sound sensor. And a determining means for determining whether or not the measured landing sound pressure value output from the step (c) exceeds a predetermined landing sound pressure threshold value.