JP5448153B2 - Artifact detection system, and artifact detection method used in the system - Google Patents

Description

This invention relates to artifact detection method used artifact detection system, and the system, in particular, suitable for use in detecting submarines present on the seabed or water bottom, mines, artifacts, such as precipitation deaths Ship artifact detection system, and artifact detection method used in the system.

  Artifacts (eg, submarines, mines, shipwrecks, etc.) present on the seabed or underwater are difficult to detect using an underwater acoustic probe (sonar). The reason is that the underwater acoustic exploration device hardly discriminates the natural sand mud from the seabed and artifacts from the reverberant sound even when high frequency underwater acoustic waves are radiated to the seabed. For this reason, a method of observing the surface shape of the seabed or the bottom of the sea using high-frequency, high-resolution side-scan sonar has been put to practical use as a method of detecting the seabed or the seabed artifact.

  This type of related side scan sonar includes, for example, a sound source / sonic sensor 1, a data processing device 2, and a display 3, as shown in FIG. Further, an artificial object HW such as a shipwreck exists on the seabed or waterbed B. In this side scan sonar, the sound source of the sound source / acoustic sensor 1 is mounted on the side of the hull or towing of the ship (not shown), and the sound wave swa is emitted in a direction perpendicular to the traveling direction of the ship. Further, the sound pressure of the received sound wave swb is converted into an electric signal eu by the sound wave sensor of the sound source and sound wave sensor 1 and output. The acoustic wave sensors are arrayed so as to have a high resolution in the traveling direction of the ship. In the data processing device 2, the electric signal eu output from the sound source / sonic wave sensor 1 is directional-combined in the traveling direction of the ship, and the signal intensity for each directional beam is stored in a memory (not shown). Along with the progress of the ship, the indicator 3 displays the accumulated signal intensity from the seabed or the bottom B by expressing it in color or shade on a map. Thereby, the shape of the seabed or the bottom B is observed.

In addition to the above-mentioned side scan sonar, this type of related technology includes, for example, an artificial object acoustic detection device described in Patent Document 1.
In this acoustic detection device, an acoustic signal having one or more frequencies enters the ground, underwater or a sedimentary layer and vibrates a strain-deformable object such as a landmine. Thereby, non-linear distortion of the exploration signal appears, and an acoustic wave (non-linear signal) including a harmonic and a coupling frequency is generated. This acoustic wave is analyzed to detect an artifact.

  Further, in the running rod monitoring method described in Patent Document 2, the dredge device includes a kite, a kite chain connected to the kite, a hoisting machine for winding the kite chain, and the vibration sound detection device. Is provided. With this vibration sound detection device, vibration sound from the dredger generated at the time of the dredging is detected, and the dredger of the ship is detected.

JP 2001-510901 A JP-A-62-059866

However, the related technology has the following problems.
That is, the side scan sonar of FIG. 4 has a problem that the range that can be observed at one time is narrow, and it takes a very long time to search for the artificial object HW existing on a wide seabed or bottom B, and the processing efficiency is poor. Further, in this side scan sonar, since the shape of the seabed or the bottom B is observed, there is a problem that the artifact HW is not detected when it is buried in the seabed or the bottom B.

  In addition, the acoustic detection device described in Patent Document 1 is configured to detect an artificial object such as a landmine in the ground or the seabed or ore by sound waves, and is different in configuration from the present invention.

  The anchorage monitoring system described in Patent Document 2 detects vibrations of a ship's dredging dragging the seabed by a vibration sound detection device, and detects that the ship is being flown. Is different. In addition, it is not possible to detect artifacts on the bottom of the sea, such as a submarine seated on the seabed.

The present invention has been made in view of the above-described circumstances, and provides an artifact detection system for efficiently detecting artifacts existing on a wide range of seabeds and bottoms at once , and an artifact detection method used in the system. The purpose is that.

To solve the above problem, a first arrangement of the invention relates to artifact detection system for detecting artifacts present in the sea or in water in a manner sitting on the seabed or water bottom, it dropped placed on the seabed or water bottom, artificial earthquake means Ru is generated a predetermined scale seismic, arranged in the sea or water, wherein the seismic detects a sound wave that will be emitted from the seismic generating means, the radiation from the artificial earthquake means Vibration wave detecting means for detecting a seismic wave (P wave) radiated into the sea or water while propagating through the seabed or water bottom at a faster propagation speed than the sound wave , and the sound wave generated by the artificial earthquake is before reaching the vibration wave detecting unit, when the seismic wave level detected by the vibration wave detecting means is relatively high, detects the arrival direction of the seismic waves, said undersea arrival direction or The artifact is characterized in that it comprises a artifact existence determination means for determining that sits on the bottom.

The second configuration of the present invention relates to artifact detection method used artifact detection system for detecting artifacts present in the sea or in water in a manner sitting on the seabed or water bottom, dropped placed on the seabed or water bottom The artificial earthquake generating means is configured to generate an artificial earthquake of a predetermined scale, and the vibration wave detecting means disposed in the sea or underwater is radiated from the artificial earthquake generating means by the artificial earthquake. detects the sound waves that will be, the radiated from seismic generation means, while propagating the seabed or water bottom at a higher propagation velocity than the acoustic wave, to detect the vibration wave that is radiated into the sea or water (P-wave) a vibration wave detecting process, artifact presence determination means, before the sound wave generated by the seismic reaches the vibration wave detecting unit, the vibration wave level of which is detected by the vibration wave detecting means When is the relatively high, detects the arrival direction of the vibration wave, the artifact on the seabed or water bottom of the arrival direction is characterized by performing the determining artifact presence determination process that enshrined.

According to the configuration of the present invention, since the sound wave generated by the artificial earthquake reaches the vibration wave detecting means, the vibration wave (P wave) radiated from the artificial object sitting on the sea floor or the water bottom is detected. , without being affected by the water waves, artifacts present in the seabed or water bottom can be detected in a wide range at a time.

It is a figure which shows the structure of the principal part of the artifact detection system which is 1st Embodiment of this invention, and the environment where this system is used. It is a figure which shows the example of the signal analyzed by the data processor. It is a figure which shows the structure of the principal part of the artifact detection system which is the 2nd Embodiment of this invention, and the environment where this system is used. It is a block diagram of a side scan sonar.

  The artifact detection unit configured to detect the vibration wave having a relatively high level as a low-frequency vibration generated when the artifact is vibrated by an earthquake wave of the artificial earthquake. Provide a system.

Further, the artifact presence determination means performs frequency analysis on the vibration wave detected by the vibration wave detection means before the sound wave generated by the artificial earthquake reaches the vibration wave detection means, and based on the analysis result, It is configured to detect the presence of an artifact.
Further, the vibration wave detection means has directivity for detecting the vibration waves in the horizontal direction of the east-west direction and the north-south direction, and the artifact existence determination means is detected by the vibration wave detection means. Based on the detection result of the vibration wave, the arrival direction of the vibration wave is detected.

  Further, the vibration wave detecting means has a plurality of vibration sensors arranged separately in the sea or water, and each vibration sensor detects vibration waves radiated from the sea floor or water bottom into the sea or water. The artifact presence determining means detects the arrival direction of each vibration wave when the level of each vibration wave detected by each vibration sensor is relatively high, and It is set as the structure which pinpoints the position of the said artificial object which exists in the sea bottom or the water bottom using the principle of surveying. The artificial earthquake generating means is composed of explosives, and the explosive energy has downward directivity or lateral directivity.

Embodiment 1

FIG. 1 is a diagram showing a configuration of a main part of an artifact detection system according to the first embodiment of the present invention and an environment in which the system is used.
As shown in FIG. 1, the artificial object detection system of this embodiment includes an epicenter 11 of an artificial earthquake, a vibration sensor 12, a data processing device 13, and a display 14. The seismic source 11 of the artificial earthquake is arranged on the sea bottom or the bottom B, and generates an artificial earthquake of a predetermined scale (small scale). In particular, in this embodiment, the epicenter 11 of the artificial earthquake is composed of explosives dropped from the sea surface or the water surface, and the explosive energy has directivity that is downward or lateral.

  The vibration sensor 12 is suspended from, for example, a ship (not shown) and placed in the sea or underwater, detects explosion sound se (sound wave, P wave) generated by an artificial earthquake, and propagates faster than the explosion sound se. A vibration wave radiated into the sea or water from the seabed or the waterbed B propagating the seismic wave qw (P wave, S wave, and surface wave) at a velocity is detected and converted into an electrical signal sv. At the bottom of the sea or at the bottom of the sea B, when an artificial earthquake is generated by detonating explosives that have directivity downward or sideways, the speed at which vibration propagates in water is 1.5 km / sec. Waves propagate at 5-7 km / sec. Accordingly, the vibration wave of the seabed or the bottom of the water propagates 3 to 5 times faster than the explosion sound in the sea or underwater. In addition, since it is liquid in the sea or underwater, only the P wave of the vibration wave caused by the artificial earthquake is transmitted. Moreover, since the sand mud absorbs vibration, the radiating vibration wave (P wave) is attenuated and the sea bottom or the water bottom B covered with soft sand mud becomes comparatively small. On the other hand, since the hard artificial object HW such as metal does not attenuate the vibration wave (P wave) propagating through the seabed or the water bottom B, the vibration wave (P wave) to be radiated is relatively large. Moreover, the vibration sensor 12 has directivity for detecting the vibration wave (the sea bottom or water bottom radiation vibration wave bw, the artifact radiation vibration wave hw) in the horizontal direction of the east-west direction and the north-south direction.

  The data processing device 13 is composed of a computer controlled based on an artifact detection control program, and is mounted on a ship (not shown). Based on the detection result of the vibration wave detected by the vibration sensor 12, the data processing device 13 The direction of arrival is detected. In particular, in this embodiment, the data processing device 13 analyzes the electrical signal sv, detects the arrival direction of the vibration wave when the level of the vibration wave detected by the vibration sensor 12 is relatively high, and It is determined that an artifact HW (for example, a submarine, a mine, a shipwreck, etc.) exists on the seabed or the bottom B of the arrival direction. In this case, the data processing device 13 uses the vibration wave having a relatively high level as a result of the low-frequency vibration (that is, the artifact radiated vibration wave hw) generated when the artifact HW vibrates with the seismic wave qw of the artificial earthquake. Detect as. The data processing device 13 performs frequency analysis on the vibration wave detected by the vibration sensor 12 before the explosion sound se (sound wave) generated by the artificial earthquake reaches the vibration sensor 12, and based on the analysis result. The presence of the artifact HW is detected. The display 14 displays the determination result by the data processing device 13, for example, displays the direction of the artificial object HW on the seabed or the bottom B detected by the data processing device 13, and is relatively large from the artificial object HW. Make it easy to identify vibration waves.

FIG. 2 is a diagram illustrating an example of a signal analyzed by the data processing device 13, and FIG. 2A is a diagram illustrating an example of a received signal by a vibration sensor having north-south directivity, and FIG. ) Is a diagram illustrating an example of a received signal by a vibration sensor having east-west directivity, and FIG. 8C is a diagram illustrating an example of calculation of a direction in which an artifact HW is detected.
With reference to these drawings, processing contents of the artifact detection method used in the artifact detection system of this embodiment will be described.
In this artifact detection system, the seismic source 11 of the artificial earthquake arranged on the sea floor or the bottom B is composed of explosives, and by exploding the explosives, explosive energy having downward or lateral directivity is generated. An artificial earthquake of a predetermined scale occurs (artificial earthquake generation processing). Sound waves generated by the artificial earthquake are detected by the vibration sensor 12 arranged in the sea or water, and are radiated into the sea or water from the sea floor or the sea floor B that propagates the seismic wave qw at a faster propagation speed than the sound waves. A vibration wave is detected (vibration wave detection process). When the level of the vibration wave detected by the vibration sensor 12 is relatively high by the data processing device 13, the arrival direction of the vibration wave is detected, and the artifact HW exists on the seabed or the bottom B of the arrival direction. Is determined to be performed (artifact existence determination process). And the determination result by the data processor 13 is displayed on the indicator 14.

  In the artifact presence determination process, the data processor 13 causes the vibration wave having a relatively high level to generate low-frequency vibrations (artificial waves) generated when the artifact HW vibrates with the seismic wave qw of the artificial earthquake. It is detected as an object radiation vibration wave hw). In the artifact presence determination process, the vibration wave detected by the vibration sensor 12 is frequency-analyzed by the data processing device 13 before the sound wave generated by the artificial earthquake reaches the vibration sensor 12. Based on the analysis result, the presence of the artifact HW is detected. Further, in the artifact presence determination process, based on the detection result detected by the data sensor 13 by the vibration sensor 12 having directivity for detecting the vibration wave in the horizontal direction of the east-west direction and the north-south direction, The arrival direction of the vibration wave is detected.

2A and 2B, the vibration wave component from the artificial object HW having a sound source azimuth of 45 degrees and an S / N ratio of 3 dB is added.
2 (a) and 2 (b), the data processing device 13 determines that the signal level of the received signal is relatively high as a vibration wave from the artifact HW, and the signal level values of the north and south and east and west thereof. The azimuth is calculated by the inverse TAN function. As a result of calculating the azimuth by the inverse TAN function, the signal near 45 degrees azimuth slightly to the left from the center in FIG. 2C has a large level and the azimuth is stable. Determined. In this case, the vibration wave radiated from the seabed of natural sand mud is omnidirectional.

  As described above, in the first embodiment, an artificial earthquake is generated by the artificial earthquake source 11 disposed on the seabed or the bottom B, and the artificial earthquake is performed by the vibration sensor 12 disposed in the sea or underwater. And a vibration wave radiated into the sea or underwater from the seabed or the seabed B propagating the seismic wave qw at a higher propagation speed than the sound wave is detected, and the vibration sensor 12 is detected by the data processor 13. When the level of the vibration wave detected in (2) becomes relatively high, the arrival direction of the vibration wave is detected, and it is determined that the artifact HW exists on the seabed or water bottom B of the arrival direction. As a result, the hard artifact HW existing on the seabed or the bottom B is detected in a wide range without being affected by the explosion sound (sound wave) in the water, and the hard artifact buried in the seabed or the bottom B. HW is detected.

Embodiment 2

FIG. 3 is a diagram illustrating a configuration of a main part of an artifact detection system according to the second embodiment of the present invention and an environment in which the system is used.
In the artifact detection system of this embodiment, as shown in FIG. 3, a data processing device 13A having a different function is provided instead of the data processing device 13 in FIG. 1, and a vibration sensor 15 is added. Yes. The vibration sensor 15 is arranged in the sea or water at a predetermined distance from the vibration sensor 12, and detects the vibration wave radiated from the seabed or the bottom B into the sea or the water in the same manner as the vibration sensor 12. When the level of each vibration wave detected by the vibration sensors 12 and 15 becomes relatively high, the data processing device 13A detects the arrival direction of each vibration wave, and uses each arrival direction and the principle of triangulation. Then, the position of the artifact HW existing on the seabed or the bottom B is specified. In triangulation, a triangular point is created in an environment where there are no obstacles between each other, and one side and two depression angles are measured, the length of the other two sides is calculated, and the direction angle of one side is given. The position of another point is obtained. Usually, a wide range of surveying is performed by connecting a large number of the triangular points.

  In this artifact detection system, the data processor 13A detects the arrival direction of each vibration wave based on the level of each vibration wave detected by the vibration sensors 12 and 15, and the principle of each arrival direction and triangulation , The position of the artificial object HW existing on the seabed or the bottom B is specified.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the embodiment, and even if there is a design change without departing from the gist of the present invention, Included in the invention.
For example, in the second embodiment, the number of vibration sensors is not limited to two and may be three or more. Further, as the epicenter 11 of the artificial earthquake, in addition to explosives, for example, an electric vibrator using a piezoelectric element or the like, or a burst sound of compressed air may be used.

  The present invention can be applied to all artifact detection systems that detect artifacts present on the seabed or water bottom.

11 Sources of artificial earthquakes (means for generating artificial earthquakes)
12, 15 Vibration sensor (vibration wave detection means)
13, 13A data processing device (artifact existence determination means)
14 Display (part of the artifact detection system)

Claims (13)

An artificial object detection system for detecting an artificial object existing in the sea or water in a manner of sitting on the sea floor or the water floor,
It dropped placed on the seabed or water bottom, and artificial earthquake means Ru is generated a predetermined scale seismic,
Disposed in the sea or water, by the seismic detects a sound wave that will be emitted from the seismic generating means, said emitted from seismic generating means, propagating the seabed or water bottom at a higher propagation velocity than the acoustic waves And vibration wave detecting means for detecting seismic waves (P waves) radiated into the sea or water,
Before the sound wave generated by the artificial earthquake reaches the vibration wave detection means, when the level of the earthquake wave detected by the vibration wave detection means is relatively high, the arrival direction of the seismic wave is detected, artifact detection system, characterized in that the seabed or the artifact to the sea bed of the arrival direction is provided with a artifacts existence determination means for determining that the sitting. The artifact presence determining means includes
The artificial wave according to claim 1, wherein the vibration wave having a relatively high level is detected as a low-frequency vibration generated by the vibration of the artificial object by the seismic wave of the artificial earthquake. Object detection system. The artifact presence determining means includes
Before the sound wave generated by the artificial earthquake reaches the vibration wave detection means, the vibration wave detected by the vibration wave detection means is frequency-analyzed, and based on the analysis result, the presence of the artifact is detected. The artificial object detection system according to claim 1, wherein the artificial object detection system is configured to detect. The vibration wave detecting means includes
Directivity for detecting the vibration wave in the horizontal direction of the east-west direction and the north-south direction,
The artifact presence determining means includes
4. The artificial object detection according to claim 1, wherein the vibration wave arrival direction is detected based on a detection result of the vibration wave detected by the vibration wave detection means. system. The vibration wave detecting means includes
It has a plurality of vibration sensors arranged separately in the sea or water, and each vibration sensor is configured to detect vibration waves radiated into the sea or water from the seabed or waterbed,
The artifact presence determining means includes
When the level of each vibration wave detected by each vibration sensor becomes relatively high, the arrival direction of each vibration wave is detected, and the arrival direction of each vibration wave and the principle of triangulation are used to detect the seabed or the bottom of the water. 5. The artificial object detection system according to claim 1, wherein the position of the existing artificial object is specified. The artificial earthquake generating means is
The artificial object detection system according to any one of claims 1 to 5, wherein the artificial object detection system is composed of explosives, and the explosive energy has directivity in a downward direction or a horizontal direction. An artifact detection method for use in an artifact detection system for detecting artifacts existing in the sea or water in a manner of sitting on the seabed or waterbed,
Artificial earthquake generating means for generating an artificial earthquake of a predetermined scale, wherein the artificial earthquake generating means dropped on the seabed or the waterbed,
Vibration wave detecting means arranged in the sea or water, by the seismic, said detects the sound waves that will be emitted from the seismic generating means, is emitted from the seismic generator, higher propagation velocity than the acoustic waves A vibration wave detection process for detecting a vibration wave (P wave) radiated into the sea or water while propagating through the seabed or water bottom
When the level of the vibration wave detected by the vibration wave detection means becomes relatively high before the sound wave generated by the artificial earthquake reaches the vibration wave detection means, the artifact presence determination means An artifact detection method comprising: detecting an arrival direction of a vibration wave, and performing an artifact presence determination process for determining that the artifact is settled on the seabed or water bottom of the arrival direction. In the artifact presence determination process,
The artificial object presence determining means detects the vibration wave having a relatively high level as a low-frequency vibration generated by the vibration of the artificial object caused by the seismic wave of the artificial earthquake. Artifact detection method. In the artifact presence determination process,
The artifact presence determination means performs frequency analysis on the vibration wave detected by the vibration wave detection means before the sound wave generated by the artificial earthquake reaches the vibration wave detection means, and based on the analysis result The method for detecting an artifact according to claim 7 or 8, wherein the presence of the artifact is detected. The vibration wave detecting means has directivity for detecting the vibration wave in the horizontal direction of the east-west direction and the north-south direction,
In the artifact presence determination process,
The said artifact presence determination means detects the azimuth | direction of the said vibration wave based on the detection result of the said vibration wave detected by the said vibration wave detection means, The Claim 7, 8 or 9 characterized by the above-mentioned. Artifact detection method. The vibration wave detection means has a plurality of vibration sensors arranged separately in the sea or water, and each vibration sensor detects vibration waves radiated from the sea bed or water bottom into the sea or water. ,
In the artifact presence determination process,
When the level of each vibration wave detected by each vibration sensor is relatively high, the artifact presence determination means detects the arrival direction of each vibration wave, and the principle of each arrival direction and triangulation 11. The method for detecting an artifact according to claim 7, 8, 9 or 10, wherein the position of the artifact existing on the seabed or the bottom of the water is specified using the above.   The method for detecting an artificial object according to any one of claims 7 to 11, wherein the artificial earthquake generating means is composed of an explosive material, and the explosive energy has a directivity in a downward direction or a horizontal direction. 7. The artifact detection system according to claim 1 , further comprising a computer-readable artifact detection control program for causing a computer to function as the artifact presence determination unit.

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