KR20120031710A - Technology for detection and location of artillery activities - Google Patents

Abstract

PURPOSE: A system for determining the drop position of a cannon ball and a method for determining the drop position of a cannon ball using the same are provided to extract a distance between the current position of a cannon ball and a drop point. CONSTITUTION: A system for determining the drop position of a cannon ball comprises sound wave sensors(110,120,130), a seismometer(210), a recording device(220), and a processing device(230). The sound wave sensors are arranged on the angular points of a triangular structure and sense sound waves. The seismometer is arranged on the center of a triangular area formed by the sound wave sensors and senses seismic waves. The recording device records and stores the physical quantity sensed from the sound wave sensors and the seismometer. The processing device calculates the explosion time of a cannon ball and a distance between the current position to a drop point(10) of the cannon ball.

Description

Drop positioning system for shells and method for determining the drop position of shells using the same

The present invention relates to an observation system capable of observing a drop point of a shell in real time and deriving an explosion time and position, and an observation method using the same.

In the front area of Korea, various types of military training conducted by the ROK military and neighboring countries are continuously occurring. In particular, continuous and systematic monitoring of military activities (gunshots) carried out in neighboring countries is a task to be carried out at the defense level.

Of course, the method of observing the drop position of these shells can be performed using satellites or advanced equipment, but it can detect near-field military activities such as artillery fire by actively utilizing non-military seismic waves and sound wave observation techniques at a lower cost. And it is meaningful to introduce a new observation system that can be configured, installed and operated at low cost.

The present invention has been made to solve the above problems, an object of the present invention is to observe the seismic waves and sound waves generated at the drop point of the shell, based on the observed physical quantity, the distance to the drop point of the shell, explosion time To provide a system and method that can be derived.

As a means for solving the above problems, the present invention is a system for detecting the sound waves and seismic waves generated at the dropping point of the shell to determine the shell drop position,

A sound wave sensor disposed at a vertex of a triangular arrangement structure forming a predetermined distance from the ground to detect sound waves, and an earthquake detector disposed at the center of the triangle region formed by the sound wave sensors to detect seismic waves; A recording device for recording and storing the physical quantity detected by the sound wave sensor and the seismograph; And a processing device for calculating the distance to the dropping point of the shell and the explosion time of the shell based on the physical quantity stored in the recording device.

The method of determining the drop position of the shell using the drop position determination system of the shell includes the steps of detecting seismic waves and sound waves generated from the drop point of the shell with an earthquake and three sound wave sensors and storing them in the recording device; Deriving a distance (D) from the center of the system to the explosion point by using the difference in arrival time between the seismic wave and the sound wave signal stored in the recording device; And determining the generation direction from the difference in arrival time between the three sound wave signals and the relative coordinate information between the respective sensors.

According to the present invention, it is possible to provide a system and method for easily deriving information of a drop position and an explosion time of a shell by applying seismic waves and sound waves observation techniques, which are pure science.

In particular, seismic and sound signal detection technology used in the pure earth science field is meaningful for defense and military purposes, and outdoor detection equipment using existing commercial sensors is mobile and unmanned and installed in the front area. Universal applicability for real-time monitoring of military activities is ensured.

Figure 1 shows a system configuration of the drop positioning system of the shell according to the present invention.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the following description with reference to the accompanying drawings, the same reference numerals denote the same elements regardless of the reference numerals, and redundant description thereof will be omitted. Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

1 is a conceptual diagram illustrating a system according to the present invention.

The drop positioning system of the shell according to the present invention (hereinafter referred to as the present system) is a sound wave sensor (110, 120, 130) is disposed at the vertex of the triangular arrangement composition forming a constant distance from the ground to detect sound waves And a seismometer 210 disposed at the center of a triangular region formed by the sound wave sensors to detect seismic waves, and a recording device 220 for recording and storing the physical quantity detected by the sound wave sensor and the seismograph and the recording device. It may be configured to include a processing device 230 for calculating the distance to the falling point 10 of the shell and the explosion time of the shell based on the stored physical quantity.

That is, the falling point of the shell can be calculated by using the signals of the earthquake wave generated at the falling point 10 of the shell and sound waves generated in the atmosphere.

The sound wave sensors (110, 120, 130) is to measure the pressure change in the air, the sound is measured at three placement positions (vertical points of the triangle arrangement) of the sound waves generated at the dropping point (10) of the shell, This is transmitted to the recording device 220 in the center of the triangle arrangement. Information can be transmitted both wirelessly and wirelessly, and in the present embodiment, can be implemented by a transmission method using a cable.

The seismograph 210 measures the minute ground motion and also transmits the seismic wave detected by the recording device 220.

The recording device 220 records and stores physical quantities obtained by the sound wave sensor and the seismograph, and implements a structure in which the GPS is connected to secure accurate input time information of the signal detected by the sensor.

)와 각각의 센서간의 상대적 좌표정보로부터 발생방향을 결정하는 방식으로 구현될 수 있다.
Basically, the detection of the drop position of the shell detects the seismic wave and sound wave signals generated from the drop point of the shell with the seismograph and three sound wave sensors, and stores them in the recording device. The distance (D) to the explosion point is derived, and the arrival time difference between the three sound wave signals (

) And the relative coordinate information between the respective sensors.

Each configuration of the system will be described in more detail an application example for deriving the drop point and the explosion time of the shell.

The shells that collide and explode on the ground generate seismic waves to the ground by the explosive energy and at the same time generate sound waves to the atmosphere. Therefore, if two signals (earthquake wave, sound wave) can be observed from a long distance, it is possible to derive the location and time of the falling point in real time using the propagation characteristics of the seismic wave and sound wave signals.

Generally, the seismic wave generated by the explosion propagates at about 5km / s underground, and the sound wave propagates at about 340m / s. The difference in time between the seismic and sound waves observed by the detector is determined by the distance function from the detector.

Therefore, the signal detected by the sound wave sensor and the seismometer according to the present invention is stored in the recording device, and based on the stored information, the processing device can derive the result value through the following operation. That is, the recording device 230 may calculate and derive the distance (D) from the detection equipment to the falling point using the following equation (1).

{1}

D = (It-St) * Vi / (1-Vi / Vs) or

D = (St-It) * Vs / (1-Vs / Vi)

(St = seismic observation time, It = sound wave observation time, Vs = seismic wave propagation speed (~ 5km / s), Vi = sound wave propagation speed (~ 0.34km / s), Ot = shell drop time)

In addition, the processing apparatus 230 may derive the explosion time of the shell by using the distance calculation result.

{Equation 2}

Ot = St-D / Vs

{Where St = seismic observation time, D = distance to shell drop point, Vs = seismic propagation speed (~ 5km / s)}

이고 두 센서 간 음파신호 도달시간차가

일 때, 발생방향(방위각θ) 와 겉보기 속도V 와의 관계는 하기의 식 3에 의해 연산될 수 있다.In addition, it is possible to determine the direction of occurrence of the explosion by the processing device, which is determined from the three sound wave signals detected by the three sound wave sensors (110, 120, 130). That is, a time difference occurs between the signals recorded in the sound wave sensors provided spaced apart according to the incident direction (360 degrees) of the sound wave signal. That is, three time differences can be measured from three sensors. For example, if the coordinates of sensor A and sensor B are

Time difference between the two acoustic sensors

When the relationship between the generation direction (azimuth angle θ) and the apparent speed V can be calculated by the following equation (3).

{Equation 3}

Since the above three equations are established from the three sound wave signals, 'θ' and 'V' can be determined by the least-square method generally used. Therefore, since the incidence direction is determined from the sound wave signal and the distance is determined from the time difference between the seismic wave and the sound wave signal, the position and the occurrence time Ot of the shell fall point can be derived.

As described above, in realizing the detection point and the related technology to calculate the time and location of the bullet drop point in real time, it can be utilized in the defense field using the propagation characteristics of earthquake and sound waves, which are pure earth science. That is, there will be a military radar for bombardment detection, but as in the present invention, the positioning using the seismic wave and the sound wave at the same time is a new approach. Effective detection is possible.

In the foregoing detailed description of the present invention, specific examples have been described. However, various modifications are possible within the scope of the present invention. The technical idea of the present invention should not be limited to the embodiments of the present invention but should be determined by the equivalents of the claims and the claims.

10: drop position of the shell
110, 120, 130: sound wave sensor
210: seismograph
220: recording device
230: processing unit

Claims (7)

In the system for detecting the sound waves and seismic waves generated at the drop point of the shell to determine the dropping position,
A sound wave sensor disposed at a vertex of a triangular arrangement structure forming a constant distance from the ground to detect sound waves;
A seismograph which is disposed at the center of a triangular region formed by the sound wave sensors to detect seismic waves;
A recording device for recording and storing the physical quantity detected by the sound wave sensor and the seismograph; And
A processing device for calculating a distance to the falling point of the shell and an explosion time of the shell based on the physical quantity stored in the recording device;
Drop positioning system of the shell comprising a.
The method according to claim 1,
The processing device,
The drop positioning system of the shell, which derives the distance (D) to the dropping point of the shell by the following {Equation 1} by using the difference between the seismic wave and the arrival time of the sound wave measured by the sound wave sensor and the seismograph. .
{Equation 1}
D = (It-St) * Vi / (1-Vi / Vs) or
D = (St-It) * Vs / (1-Vs / Vi)
(St = seismic observation time, It = sound wave observation time, Vs = seismic wave propagation speed (~ 5km / s), Vi = sound wave propagation speed (~ 0.34km / s), Ot = shell drop time)
The method according to claim 2,
The processing device,
The drop positioning system of the shell, characterized by calculating the explosion time (Ot) of the shell by the following equation (2).
{Equation 2}
Ot = St-D / Vs
{Where St = seismic observation time, D = distance to shell drop point, Vs = seismic propagation speed (~ 5km / s)}
The method according to any one of claims 1 to 3,
Coordinates between two adjacent sensors A and B among three sound wave sensors arranged at vertices of the triangle arrangement scheme

Time difference between the two acoustic sensors

Wherein the shell's explosion direction (azimuth angle θ) and the apparent velocity V are determined by the following equation (3).
{Equation 3}

1) detecting the seismic wave and sound wave signals generated from the falling point of the shell with a seismometer and three sound wave sensors and stored in the recording device;
2) deriving a distance (D) to the explosion point by using the difference in arrival time between the seismic wave and the sound wave signal stored in the recording device;
3) difference in arrival time between the three sound wave signals (

Determining a generation direction from relative coordinate information between each sensor;
Drop positioning method of the shell comprising a.
The method according to claim 5,
Step 2),
By placing three sound wave sensors in a triangular composition at a constant distance on the ground, and equipped with a seismograph and a recording device in the center of the triangular composition,
A drop positioning method for shells, characterized by deriving the distance to the dropping point of the shell by the following equation through the seismic wave and sound wave signals generated from the dropping point of the shell.
{Equation 1}
D = (It-St) * Vi / (1-Vi / Vs) or
D = (St-It) * Vs / (1-Vs / Vi)
(St = seismic observation time, It = sound wave observation time, Vs = seismic wave propagation speed (~ 5km / s), Vi = sound wave propagation speed (~ 0.34km / s), Ot = shell drop time)
The method of claim 6,
Step 3),
The coordinates between two adjacent sensors A and B among three sound wave sensors arranged at the vertices of the triangle arrangement

Time difference between the two acoustic sensors

Wherein the shell's explosion direction (azimuth angle θ) and the apparent velocity V are determined by the following equation (3).
{Equation 3}

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