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JP2010151720

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DESCRIPTION JP2010151720
An object of the present invention is to make it possible to reduce distortion in directivity and
widen a detection range. A transmission line array and a reception line array are each divided
into two transmission line arrays 1 and 2 and reception line arrays 3 and 4. The transmission line
arrays 1 and 2 and the reception line arrays 3 and 4 are three-dimensionally arranged in a cross
so as to form a vertex at the central portion of the transducer, and an umbrella-type cross array
(an umbrella-type cross array And the zenith direction of the line array is inclined at θ ° with
respect to the zenith direction of the transducer. Since the zenith direction of the transducer and
the zenith direction of the line array are deviated by θ °, the deviation between the coordinate
position of the target and the actual coordinate position becomes smaller and wider than in the
case of using the planar cross array Target detection with high accuracy is possible in the range.
[Selected figure] Figure 1
Transducer, line array antenna, and fan beam generation method
[0001]
The present invention relates to a transducer of a sonar apparatus using a cross fan beam, a line
array antenna, and a fan beam generation method.
[0002]
In Patent Document 1, a transmitter / receiver is an array (cross array of plane arrangement) in
which a transmission element array (transmission line array) and a reception element array
(reception line array) are cross-crossed on a plane. It consists of).
04-05-2019
1
This transducer is installed or fixed on the seabed or bottom, and has a fan-shaped transmission
beam (transmission fan beam) whose main axis direction is changed for each frequency to be
transmitted. A receive beam (receive fan beam) is generated at the sea level or in the water
surface direction.
[0003]
As a result, it is possible to set a three-dimensional range in which the transmission wave and the
reception fan beam intersect each other in the shape of a quadrangular pyramid as a detection
range. Also, by converting the acoustic signal to an electrical signal from the sound (echo)
reflected from the target received by the generated reception fan beam, the signal is processed as
an echo signal to obtain a target on the quadrangular pyramid detection range. Is displayed on
three-dimensional coordinates. Patent No. 4075472
[0004]
However, in Patent Document 1 described above, in order to widen the detection range with a
transducer configured of a plane cross array, the angle (beam steering angle) of the main axis
direction of the fan beam generated in the zenith direction of the transducer When it is set to 0
°, it is necessary to set a large beam steering angle from the zenith direction of the transducer.
In this case, a deviation occurs between the target coordinate position obtained by the signal
processing result and the actual coordinate position. There was a problem that.
[0005]
The reason is that the line array to be used has a configuration in which the transducers for
generating ultrasonic waves are arranged in a line, and when the beam steering angle is
generated in the fan beam generated by this line array, the directivity is expanded. This is
because distortion occurs such that both longitudinal ends of the beam bend in the steering angle
direction.
[0006]
Since this distortion increases in proportion to the beam steering angle, especially at the end of
the detection range where the angle is large, the crossing range of the transmit and receive fan
beams is transmitted and received with respect to the calculated coordinate position. It is
because it is formed in the direction away from the zenith direction of a wave.
04-05-2019
2
[0007]
Further, in Patent Document 1 described above, at the end of the detection range, there are
places where the target can not be detected and can not be detected.
The reason is that at the end of the detection range where the beam steering angle increases,
distortion of the generated fan beam causes the transmitting and receiving fan beams to cross
the transmitting and receiving ranges relative to the calculated coordinate position. In the actual
detection range corresponding to the calculated coordinate position, the echo of the target
becomes smaller due to the drop in directivity, and the S / S is reduced. This is because the
deterioration of the N ratio occurs.
[0008]
The present invention has been made in consideration of such circumstances, and its object is to
reduce distortion in directivity and to widen the detection range, and also to increase the
detection range, and line array antenna, and To provide a fan beam generation method.
[0009]
In order to solve the problems described above, the present invention is a transmitter / receiver
that includes a transmission line array and a reception line array which are disposed to cross
each other and generates a plurality of cross fan beams, and the transmission / reception An
offset corresponding to θ ° is provided between the zenith direction of the device and the
zenith direction of the transmission line array and the reception line array.
[0010]
Further, in order to solve the problems described above, the present invention is a transducer
that includes a transmission line array and a reception line array which are disposed to cross
each other in a cross, and generates a plurality of cross fan beams, The transmission line array
and the reception line array are each divided into two, and the divided transmission line array
and the transmission line array are formed at the center of the transmitter / receiver. It is a
transducer characterized in that it is three-dimensionally arranged in a cross.
[0011]
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3
Further, in order to solve the above-mentioned problems, the present invention is a line array
antenna comprising a transmission line array and a reception line array which are disposed to
cross a cross of a transducer. It is a line array antenna characterized in that an offset of θ ° is
provided between the zenith direction and the zenith direction of the transmission line array and
the reception line array.
[0012]
In addition, in order to solve the above-mentioned problems, the present invention is a line array
antenna comprising a transmission line array and a reception line array which are arranged
crosswise to a transducer, and the transmission line array. And the wave receiving line array are
each divided into two, and the wave transmitting line array and the wave transmitting line array
which are divided into the two are divided in a three-dimensional manner so as to form a vertex
at the central portion of the transducer. It is a line array antenna characterized by being arranged
in
[0013]
Further, in order to solve the above-mentioned problems, the present invention is a fan beam
generation method for generating a cross fan beam from a transmission line array and a
reception line array which are arranged on a transducer with a cross. An offset by θ ° is
provided between the zenith direction of the transducer and the zenith direction of the
transmission line array and the reception line array, and the transmission of the transmission fan
beam and the reception fan beam divided Among the line array and the reception line array, the
transmission fan beam to be generated and the transmission line array having an offset in the
same direction as the main axis direction of the reception fan beam are characterized by being
generated from the reception line array Is a fan beam generation method.
[0014]
Further, in order to solve the above-mentioned problems, the present invention is a fan beam
generation method for generating a cross fan beam from a transmission line array and a
reception line array which are arranged on a transducer with a cross. The transmission line array
and the reception line array are each divided into two, and the divided transmission line array
and the transmission line array are three-dimensionally formed to form a vertex at the central
portion of the transducer. Of the transmission line array and the reception line array, which are
arranged in a cross, and the transmission fan beam and the reception fan beam are divided, and
the main axis direction of the transmission fan beam and the reception fan beam to be generated.
A fan beam generation method characterized in that the transmission line array and the
reception line array which are angled in the same direction are generated.
04-05-2019
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[0015]
According to the present invention, the distortion of directivity can be reduced, and the
advantage that the detection range can be expanded can be obtained.
[0016]
Hereinafter, an embodiment of the present invention will be described with reference to the
drawings.
[0017]
A.
Embodiment FIG. 1 is an external view showing the structure of a transducer for a sonar
apparatus using a cross fan beam according to an embodiment of the present invention.
In the figure, the transmission line array and the reception line array are each divided into two to
form transmission line arrays 1 and 2 and reception line arrays 3 and 4, which are peaked at the
central portion of the transducer. They are three-dimensionally arranged in a cross to form an
umbrella-type cross array (an umbrella-type cross array).
Thus, the zenith direction of the line array is inclined by θ ° with respect to the zenith direction
of the transducer.
A transducer using an umbrella-type cross array is installed on the seabed, forms a transmission
fan beam in the direction of the sea surface to transmit, and receives an echo of a target with a
reception fan beam formed in the direction of the sea surface.
[0018]
Next, a cross fan beam is generated in the transducer for a sonar apparatus using the umbrellatype cross array shown in FIG. 1 and the transducer using a flat cross array according to Patent
Document 1 according to the present embodiment. The difference between the case of the beam
shift angle and the distortion of directivity will be described.
04-05-2019
5
[0019]
FIG. 2 is an external view showing the structure of a transducer using a plane cross array
according to Patent Document 1. As shown in FIG.
In FIG. 2, in the transducer using a planar cross array, the transmission line array 5 and the
reception line array 6 are arranged in a cross so as to cross at the central portion of the
transducer.
[0020]
Further, FIG. 3 is a transducer using a planar cross array and distortion of directivity when a
plurality of fan beams are generated at equal intervals in the direction from φ0 ° to φn °
(−φn °) in the zenith direction. It is a conceptual diagram showing.
Since the beam steering angle of the transmitting and receiving fan beams and the distortion
pattern of the directivity are the same, FIG. 3 shows one side of the transmitting and receiving
fan beams.
[0021]
In the transducer using the planar cross array shown in FIG. 2, since the zenith direction of the
transducer and the zenith direction of the line array are the same, the beam steering angle of the
fan beam generated to expand the detection range, The beam steering angle of the fan beam
viewed from the zenith direction of the wave device is the same angle.
[0022]
Therefore, as shown in FIG. 3, when a fan beam is generated in the directions of φ1 ° (-φ1 °),
φ2 ° (-φ2 °), ..., φn ° (-φn °) from the zenith direction of the transducer The beam steering
angle of the lens is as follows: φ1 ° (-φ1 °), φ2 ° (-φ2 °), ..., φn ° (-φn °).
04-05-2019
6
In this case, the directivity distortion also increases in proportion to the beam shift angle, so that
for the direction away from the transducer's zenith direction, the directivity of both of the
calculated fan beams is distorted, and The reception intersection point deviates from the
calculated position shown in FIG. 4 as shown in FIG. 5, and as a result, a deviation occurs
between the coordinate position of the target obtained by signal processing and the actual
coordinate position Accuracy is reduced.
[0023]
Next, FIG. 6 is a transducer using the umbrella-type cross array shown in FIG. 1 according to this
embodiment, in which a plurality of fan beams are directed from φ0 ° to φn ° (−φn °) in
the zenith direction. It is a conceptual diagram showing distortion of directivity at the time of
generating at equal intervals.
6 also shows only one side of the transmit and receive fan beams, as in FIG.
[0024]
As shown in FIG. 1, the zenith direction of the transducer and the zenith direction of the line
array are offset by θ °, and the beam steering angle of the fan beam generated to extend the
detection range is equal to this offset It is the steering angle considered.
Therefore, as shown in FIG. 6, the fan beam is directed in the directions of φ1 ° (-φ1 °), φ2
° (-φ2 °), ..., φn ° (-φn °) from the zenith direction in the zenith direction of the transducer.
The beam steering angle in the case of generation is (φ 1 −θ) ° (− (φ 1 −θ) °), (φ 2 −θ)
° (− (φ 2 −θ) °),. It becomes-(theta) (degree) (-((phi) n- (theta)) degree).
[0025]
In this case, the shift angle of the generated fan beam is offset because the zenith direction of the
transducer and the zenith direction of the line array are deviated by θ °, as compared with the
case where the planar cross array shown in FIG. 2 is used. It may be smaller by a minute.
04-05-2019
7
[0026]
For this reason, in the transducer using the umbrella-type cross array according to the present
embodiment, it is possible to minimize the distortion of directivity generated in proportion to the
beam shift angle.
As a result, for the azimuth away from the zenith direction of the transducer, the intersection
points of the transmit and receive fan beams are as shown in FIG. 7 for the calculated positions
shown in FIG. As compared to the case of a transducer using a planar cross array, the deviation
can be suppressed to a small value, so the deviation between the coordinate position of the target
determined by signal processing and the actual coordinate position is small, and the target with
high accuracy in a wide range Detection is possible.
[0027]
According to the embodiment described above, when generating a plurality of fan beams in the
direction of φn ° (−φn °) from the zenith direction of the transducer, the steering angles of
the beams use the cross array of the planar array As a result, distortion of directivity can be
suppressed to a low level, and the error between the three-dimensional coordinates of the target
detected by signal processing and the coordinates of the actual target becomes small, and high
accuracy is achieved. Can be detected.
[0028]
B.
Modifications Next, modifications of the present invention will be described.
FIG. 8 is an external view showing the structure of a transducer for a sonar apparatus using a
cross fan beam according to a modification of the present invention.
In the figure, in the present modification, the transmission line array and the reception line array
are each divided into two to form transmission line arrays 1a and 2a and reception line arrays 3a
and 4a, respectively, on the center side End face of the transducer is obliquely cut in the zenith
04-05-2019
8
direction of the transducer, and the obliquely cut end face is three-dimensionally arranged in a
cross and arranged in a windmill shape so that the center portion of the transducer forms a
vertex .
[0029]
As a result, as in the above-described embodiment, the zenith direction of the transmit / receive
line array is inclined by θ ° with respect to the zenith direction of the transducer, and the
transmission line arrays 1a, 2a, and The occupied area of the reception line arrays 3a and 4a can
be reduced, and the transducer can be miniaturized.
[0030]
According to the embodiment described above, the following effects can be obtained.
The first effect is that, when the detection range is extended, high precision detection can be
made over a wide range by using the cross array of the umbrella type array as compared with the
case of using the cross array of the planar array.
The reason is that when fan beams are generated in the same direction when viewed from the
zenith direction of the transducer, it is necessary to set the steering angles of the transmit and
receive fan beams large in the cross array of the planar array However, in the umbrella type
cross array, since the angle of attachment of the line array is provided, the steering angle can be
reduced as compared to the cross array of the planar array, and the distortion of directivity can
be reduced. As a result, especially at the end of the detection range where the angle becomes
large, the deviation of the crossing range of the transmit and receive fan beams becomes smaller
with respect to the calculated coordinate position.
[0031]
The second effect is that it is possible to suppress the amount of received ocean noise by
minimizing the distortion of directivity.
The reason is that when the directivity is distorted, the receiving volume also increases according
04-05-2019
9
to the distortion, so by minimizing the distortion, the receiving volume can be minimized by
minimizing the receiving volume. It becomes possible to suppress.
[0032]
It is an external view which shows the structure of the transducer for sonar apparatuses using
the cross fan beam by embodiment of this invention. It is an external view which shows the
structure of the transducer which used the planar cloth array by patent document 1. FIG. It is a
conceptual diagram of the beam shift angle of the transducer which used the planar cross array,
and the distortion of the directivity. It is a conceptual diagram which shows the example of a
point of intersection of calculation sending of a transducer using a plane cross array, and the fan
beam of receiving. It is a conceptual diagram which shows the example of a point of intersection
of the transmitting fan at the time of using a plane cross array, and the fan beam of receiving. It
is a conceptual diagram of the beam shift angle of the transducer which used the umbrella type
cross line array, and the distortion of the directivity. It is a conceptual diagram which shows the
example of a point of intersection of the fan beam of transmitting wave and receiving wave at the
time of using an umbrella type cross array. It is an external view which shows the structure of
the transducer for sonar devices at the time of arranging an umbrella-type cross array in a
windmill shape by the modification of this invention.
Explanation of sign
[0033]
1, 1a transmission line array 2, 2a transmission line array 3, 3a reception line array 4, 4a
reception line array
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