JPH04160382A - Underwater sound source direction detector - Google Patents

Abstract

PURPOSE:To enable the detection of all underwater directions by providing a receiver having a plurality of wave receiving elements forming first line parallel to a side of the base of a pyramid, and a second line orthogonal with the first line, and an azimuth detection circuit. CONSTITUTION:The output of X-direction wave receiving elements XA-XD and Y-direction wave receiving elements YA-YD attached to each wave receiving face of a receiver 10 are transmitted to a multiplexer 30 through preamplifiers 21-28. A wave receiving face detection circuit 40 detects those which are output at the earliest time point in the outputs of the preamplifiers 21-28 and detects to which face of the section a sound source faces. The multiplexer 30 selects the output from the wave receiving elements provided on the face of the circuit 40 among the outputs of the preamplifier to output to an SSBL (Super Short Base Line) processing circuit 50. The circuit 30 finds the phase difference between each output in regard to X-direction and Y- direction components of selective outputs and outputs into CPU 60 as X and Y phase data. CPU 60 calculates the direction of the sound source from the X and Y phase data.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to SSBL (Super 5hort, Ba5
The present invention relates to an underwater sound source direction detection device that detects the direction of an underwater sound source using the Line method.

[Prior Art] FIG. 7 is an explanatory diagram showing a conventional example of this type of underwater sound source direction detection device.

Since the wave receiving element is disposed on the bottom surface of the wave receiver 70, the effective measurement range was the inside of the cone with an apex angle of 120°. So, transponder, Binger,
If the sound source 81, such as a responder, is located laterally and outside the measurement effective range, the sound source 81 could not be detected. Also, even if the sound is within the effective measurement range, it is near the limit! 8
In direction 2, detection accuracy was low and detection was not easy. The reason why the detection granularity in the direction of the sound source becomes low is that each wave receiving element disposed in the wave receiver 70 cannot accurately detect the phase difference φ between the signals from the sound source to be received. for example,
When the distance between the wave receiving elements is L, the phase difference φ is expressed by equation (1) (θ is the angle from the front of the wave receiver to the direction of the sound source).

±φ=LXsjnθ... (1) And,
When θ exceeds 50°, the amount of change in sin θ becomes very small, and the change in φ also decreases, resulting in poor accuracy in detecting the direction of the sound source.

[Problems to be Solved by the Invention] The conventional underwater sound source direction detection device described above cannot effectively detect the horizontal direction below the water surface, and the effective measurement range below is also narrow.

SUMMARY OF THE INVENTION In view of the above drawbacks, it is an object of the present invention to provide an underwater sound source direction detection device capable of detecting underwater sound sources in all directions (within a hemisphere) below the water surface.

Means for Solving the Problem] The underwater sound source direction detection device of the present invention has the following features:
A plurality of wave receiving elements arranged on the slopes so as to form a first row parallel to one side of the bottom surface of the pyramid and a second row perpendicular to the first row on each slope. and a direction detection circuit that detects the direction of the sound source from the phase difference between the signals that each of the wave receiving elements on each slope of the wave receiver receives and outputs the sound wave from the sound source. Preferably, there is a wave receiving element that belongs in common to the first row and the second row, and more preferably, it is a pyramid or a pyramid in which each slope and the bottom intersect at an angle of 30° to 60°, Alternatively, the pyramid is a four-sided pyramid in which each slope and the bottom intersect at 45 degrees.

[The wave-receiving elements arranged on each slope of the working pyramid detect each direction facing each other and detect the direction of the sound source.

[Example] Next, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of the underwater sound source direction detection device of the present invention, FIG. 2 is a perspective view showing the structure of the receiver shown in FIG. 1, and FIGS. FIG. 2 is a diagram illustrating the vertical force direction and horizontal detection range of the wave receiver shown in FIG. 2, respectively.

X-direction receiving elements XA, XB, XC, XD and y-direction receiving elements YA, Y are attached to each receiving surface of the receiver 10.
B.

The outputs of YC and YD are preamplifiers 21 and 22 degrees, respectively.
, 28 to multiplexer 30. In this embodiment, the wave-receiving surfaces are the apex angles or the slopes of the four-pointed bell facing downward. Each receiving surface A.

An X-direction wave receiving element and an X-direction wave receiving element are attached to B, C, and D, respectively (for simplicity, only the wave receiving element on the wave receiving surface A is shown in FIG. 2). The X-direction wave receiving elements each include three wave receiving elements XAI, XA2 . X
A3, and are arranged in a row at equal intervals so as to be parallel to each side of the bottom surface (upper side in FIG. 2) of the quadrangular pyramid. The X-direction wave receiving elements each include three wave receiving elements YA,
,YA2. It is composed of YA3, and is arranged in a row at equal intervals so as to be perpendicular to the row of X-direction wave receiving elements. The receiving wavefront detection circuit 40 includes preamplifiers 21, 22 . . The multiplexer 30 selects the output from one wave receiving element disposed on the surface detected by the wave receiving surface detection circuit 40 from among the outputs of the preamplifier, and outputs the selected output (for example, from the wave receiving elements XA, YA).
, : i = 1, 2.3 or Rano output) as SS
It is output to the BL processing circuit 50. The SSBL processing circuit 50 calculates the phase difference between each output regarding the X direction and the X direction component of the selected output and sends it to the CPU 6 as X phase data and X phase data.
Output to 0. The CPU 60 calculates the direction of the sound source from the surface detected by the receiving wave surface detection circuit 40 and the X phase data and X phase data from the SSBL processing circuit 50. The calculation method is well known, so the explanation will be omitted.

5 and 6 show the second embodiment of the present invention. FIG. 7 is a perspective view showing each receiver used in the third embodiment.

In the embodiments shown in FIGS. 5 and 6, the wave receiving elements 22 of the wave receivers 11 and 12 work in both the X direction and the X direction. Also,
The embodiment shown in FIG. 6 is configured with the minimum number of receiving elements. The number of wave receiving elements used is inevitably smaller than in the vjl embodiment.

In the first to third embodiments, the wave receiving element was arranged on the slope of the square forceps, or it may be arranged on the slope of the triangular forceps where the slope intersects the bottom surface at 45 degrees. However, in this case, the horizontal detectable range on each slope is 120°). Furthermore, it is clear that a pyramid having a four-sided pyramid or more can also be used.

Also, if the timing of the sound wave output is instructed by the station that detects it, such as a transponder,
Since the distance to the sound edge can also be detected using the conventional technology, it is clear that not only the direction of the sound source but also the position of the sound source can be detected with high accuracy.

[Effects of the Invention] As explained above, the present invention uses a wave receiving element disposed on the slope of a pyramid to perform detection in the direction facing the slope, thereby widening the detection range and making it possible to perform horizontal detection, which was difficult in the past. Direction detection can also be performed with high precision, which has the effect of improving the accuracy of detecting sound sources in all directions underwater.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a first embodiment of the underwater sound source direction detection device of the present invention, FIG. 2 is a perspective view showing the structure of the receiver shown in FIG. 1, and FIGS. Diagrams showing the vertical and horizontal detection ranges of the receiver in Figure 2, Figures 5 and 6, respectively.
The figures are the second part of the present invention. A perspective view showing the structure of the delivery device of the third embodiment, and FIG. 7 is a diagram showing a conventional example. 10.11,12. ++・Receiver

Claims (1)

[Claims] 1. In an underwater sound source direction detection device that detects the direction of an underwater sound source using the SSBL method, on each slope of a pyramid, a first row parallel to one side of the bottom surface of the pyramid; A wave receiver including a plurality of wave receiving elements arranged on the slope so as to form a first row and a second row perpendicular to the slope; and each wave receiving element on each slope of the wave receiver. An underwater sound source direction detection device comprising: a direction detection circuit that detects the direction of the sound source from the phase difference between the signals that each element receives and outputs a sound wave from the sound source. 2. The underwater sound source direction detection device according to claim 1, wherein there is a wave receiving element that belongs in common to the first row and the second row. 3. The underwater sound source direction detection device according to any one of claims 1 to 3, wherein each slope of the pyramid intersects with the bottom face within a range of 30° to 60°. 4. The underwater sound source direction detection device according to any one of claims 1 to 3, which is a four-sided pyramid whose slopes and bottom surfaces intersect at 45 degrees.