JPH06241697A - Apparatus for spotting point of impact of artillery shell - Google Patents

Abstract

PURPOSE:To spot the point of impact of an artillery shell with high accuracy in a short time by detecting the vibration of the ground caused by the impact of the shell by means of a plurality of vibration sensors and calculating the coordinates of the point of impact on the basis of time lags among detection signals of the vibration sensors, the deployment coordinates of the respective sensors and the propagation velocity of vibration wave. CONSTITUTION:A plurality of vibration sensors S1-Sn are deployed in a lattice around an impact area 10 of an artillery shell and are buried under the ground. The respective vibration sensors S1-Sn are connected with a main body 14 of the title apparatus by means of a cable 12. When the shell 16 impacts a point within the impact area 10, the respective vibration sensors S1-Sn detect the vibration of the ground caused by the impact of the shell 16, and transmits detection signals through the cable 12 to the main body 14. Thus, the point of impact of the shell can be safely spotted with high accuracy in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bullet impacting position evaluation device suitable for assessing the impact impact position of a bullet.

[0002]

2. Description of the Related Art Conventionally, when assessing the impact position of a cannonball, the rater waits near the expected impact point and monitors the point at which the impact point hits, and the soil that scatters due to the impact of the impact The method of visually recognizing the position is adopted. In addition, when necessary, it is also possible to search for the impact marks and measure the position from the reference point.

On the other hand, in the case of a small firearm such as a rifle, as described in JP-A-55-112999, a shock wave generated when a bullet passes through is detected, and the impact position is detected according to the detected value. A method of assessing is proposed. However, this method cannot be applied to shells that do not generate shock waves.

[0004]

In the above-mentioned prior art, the method of visually recognizing the impact position of the cannonball is adopted, but when the impact position of the cannonball cannot be visually recognized, the impact position cannot be measured. . Moreover, even when it can be visually recognized, the measurement accuracy is low, and it takes a lot of time and labor for the actual measurement. In addition, the rater must wait near the expected impact point, which is a dangerous task for the rater. An object of the present invention is to provide a bullet impacting position evaluation device capable of accurately and safely assessing the impacting position of a cannonball in a short time.

[0005]

In order to achieve the above object, the present invention provides a plurality of vibration sensors arranged in the vicinity of a landing area in a dispersed manner to detect the vibration of the ground accompanying the landing of a shell, and a vibration sensor. And a plurality of timing signal generating means for generating a timing signal when the detection signal of each vibration sensor exceeds a set level, and a signal between the signals generated from each timing signal generating means. Generation time difference measuring means for measuring a time difference, placement coordinates of a vibration sensor belonging to a signal transmission system that has generated a timing signal, propagation velocity of a vibration wave, and an impact position for calculating an impact position coordinate according to a measurement value of the occurrence time difference measuring means. And a coordinate calculating means, which constitutes a bullet impacting position evaluation device. Further, it is preferable that the hitting position evaluating device includes a storage unit for storing the calculated value of the hitting position coordinate calculating unit.

[0006]

According to the above-described means, when a shell is struck in the landing area, the vibration generated when the shell is struck propagates while being damped in the ground. When the vibration of the ground is detected by any of the vibration sensors, the output signal of the vibration sensor is transmitted to the timing signal generating means. When the detection signal of the vibration sensor exceeds the set level, the timing signal generating means generates the timing signal. In this case, the timing signals are sequentially output in response to the signal from the vibration sensor installed at the closest point to the landing point. Then, the time difference between the signals of the plurality of timing signals is measured. In this case, when the time difference between at least two combinations is obtained, the landing position coordinates are calculated according to the measured value, the arrangement coordinates of the vibration sensor, and the propagation velocity of the vibration wave.
That is, it is possible to accurately and safely evaluate the bullet impacting position in a short time. Then, the calculated rating position is recorded in the recording means.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a block configuration diagram of an apparatus according to the present invention, and FIG. 2 shows an overall configuration diagram of the apparatus. 1 and 2
In FIG. 3, a plurality of vibration sensors S1 to Sn are arranged in a grid pattern around the landing area 10 and embedded in the ground. The vibration sensors S1 to Sn are connected to the apparatus body 14 via the cable 12. Each vibration sensor S1
~ Sn is configured to detect the vibration of the ground caused by the impact of the cannonball 16 when the cannonball 16 is impacted in the impact area 10 and transmit the detection signal to the main body 14 via the cable 12. There is.

In the main body 14, preamplifiers P1 to Pn,
A signal conditioner 18, a time difference measuring circuit 20, a calculation device 22, a display device 24, a keyboard 26, a storage device 28, and a printer 30 are provided, and each preamplifier P is provided.
1 to Pn are connected to the sensors S1 to Sn via a cable 12. Each preamplifier P1 to Pn is connected to each sensor S1
The signals from -Sn are amplified and the amplified signals are output to the signal conditioner 18.

As shown in FIG. 3, the signal conditioner 18 comprises an amplifier 32, a filter 34, an AGC 36, a comparator 38, and a level setter 40 for each channel. The amplifier 32 amplifies the signal from the preamplifier Pi and outputs the amplified signal via a bandpass filter 34 for noise removal.
The output signal of the filter 34 is used as a signal for monitoring, and is also input to an AGC (automatic gain adjuster) 36 so that the gain is adjusted and then input to a comparator 38.

The signal input to the comparator 38 is compared with the set level of the level setter 40, and when the set level is exceeded, a timing signal is output from the comparator 38. That is, the signal conditioner 18 constitutes a plurality of timing signal generating means for generating timing signals in response to the detection signals of the sensors S1 to Sn. Then, each timing signal is output to the time difference measuring circuit 20 for each channel.

The time difference measuring circuit 20 receives the timing signal from the signal conditioner 18, measures the time difference between the timing signals transmitted from the plurality of channels, and outputs the measurement result to the arithmetic unit 22. There is. The arithmetic unit 22 selects three channels from the measurement result from the time difference measurement circuit 20 in the order of earliest detection, and the position coordinates (placement coordinates) of the vibration sensor connected to the selected channel and the propagation speed of the vibration wave. And the impact position coordinate calculation means for calculating the impact position coordinates of the cannonball 16 from the measurement result of the time difference. The calculated landing position coordinates are displayed as an image on the screen of the display device 24, stored in the storage device 28, and the calculation result is output to the printer 30.

Next, the operation of this embodiment will be described with reference to FIGS. When the cannonball 16 is landed in the landing area 10, the vibration associated with the landing of the cannonball 16 propagates while being attenuated in the ground. This vibration is applied to each of the vibration sensors S1 to Sn.
When detected by, the detection signal is input to the signal conditioner 18 via the preamplifiers P1 to Pn. In this case, the vibration sensors S1 to S connected to the channels 1 to 3
Assuming that the detection signal of No. 3 is as shown in FIG. 4, the detection signal is first generated from the vibration sensor S2 installed at the position closest to the impact point. That is, the vibration sensor S2 connected to the channel 2 is the closest to the impact point, and becomes the vibration sensor S3 connected to the channel 3 and the vibration sensor S1 connected to the channel 1 in order.

Here, the time difference between channels 2 and 1 is Δt.
1, the time difference between channels 2 and 3 is Δt2. Further, the propagation speed of the vibration wave is set to v, and the impact point and the vibration sensor S1,
Given that the distances l1 and l2 from S2 are, the following equation holds. (L1-l2) / v = Δt1 The locus of the above equation is a hyperbola A as shown in FIG. Similarly, when obtained for channels 2 and 3, this locus is represented by the hyperbola B. Then, when the intersection of the hyperbola A and the hyperbola B is obtained, this intersection becomes the hitting position coordinates.

As described above, according to the present embodiment, the impact position coordinates of the cannonball 16 can be evaluated accurately and safely in a short time. Further, in evaluating the impact position of the cannonball 16, it is also possible to evaluate it based on the signal level. That is, since the vibration generated at the time of landing propagates in the ground while being attenuated, the magnitude of the waveform of the signal detected by the vibration sensors S1 to Sn can be measured and the generation source can be obtained from the attenuation ratio. It is also possible to use the time difference and the signal level together.

In the above-mentioned embodiment, the vibration sensors S1 to S1.
Although the Sn is arranged in the form of a grid has been described, this is because the calculation is simplified, and it is not always necessary to arrange the Sn in the form of a grid.

As a method of installing the vibration sensors S1 to Sn, in the above embodiment, the vibration sensors S1 to Sn are embedded and the cable 12 is embedded to make a permanent installation. Antenna 4
If the vibration sensor S1 and the preamplifier P1 as well as the communication device 46 and the battery 48 are built in the sensor pole 44 provided with 2, the protection from the ammunition 16 is not sure but it can be easily installed temporarily.

[0017]

As described above, according to the present invention,
The vibration of the ground caused by the impact of the shell is detected by multiple vibration sensors, and the impact position coordinates are calculated based on the time difference between the detection signals of multiple vibration sensors, the placement coordinates of the vibration sensors, and the propagation velocity of the vibration wave. Therefore, the impact position of the cannonball can be evaluated accurately and safely in a short time.

[Brief description of drawings]

FIG. 1 is a block diagram of a device showing an embodiment of the present invention.

FIG. 2 is an overall configuration diagram of a landing position evaluation device.

FIG. 3 is a block configuration diagram of a signal conditioner.

FIG. 4 is a detection waveform diagram of a vibration sensor.

FIG. 5 is a diagram for explaining a method of calculating the bullet landing position coordinates.

FIG. 6 is a diagram for explaining another arrangement method of the vibration sensor.

[Explanation of symbols]

 10 landing area 12 cable 16 shell 18 signal conditioner 20 time difference measuring circuit 22 arithmetic unit 24 display device 26 keyboard 28 storage device 30 printer S1 to Sn vibration sensor P1 to Pn preamplifier

Claims (2)

[Claims] 1. A plurality of vibration sensors which are arranged in the vicinity of a landing area in a dispersed manner to detect the vibration of the ground due to the landing of a cannonball, and a signal transmission system corresponding to the vibration sensor, and a detection signal of each vibration sensor A plurality of timing signal generating means for generating a timing signal when the set level is exceeded, a generation time difference measuring means for measuring a generation time difference between the signals generated by the respective timing signal generating means, and a signal for generating the timing signal A shell of a shell, comprising: an arrangement coordinate of a vibration sensor belonging to a transmission system, an impact position coordinate calculation means for calculating an impact position coordinate in accordance with a propagation velocity of the vibration wave and a measurement value of the generation time difference measurement means. Wearing position evaluation device. 2. A bullet impacting position evaluation apparatus according to claim 1, further comprising recording means for recording the calculated values of the impacting position coordinate calculating means.