close

Вход

Забыли?

вход по аккаунту

?

JPH07181248

код для вставкиСкачать
Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH07181248
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
horizontal linear receiver array used in the sea.
[0002]
2. Description of the Related Art A conventional horizontal linear receiver array of this type is
disclosed, for example, in Japanese Examined Patent Publication No. 1-25031. FIG. 6 shows the
side view, in which 1 is a sea surface, 2 is a buoy floating on this sea surface, 3 is a suspension
cable, 4 is a termination circuit, and this termination circuit 4 is a suspension cable 3 It is
suspended from the buoy 2 via.
[0003]
Reference numeral 5 denotes an array cable whose one end is connected to the termination
circuit 4, and 6 to 14 are receivers forming a receiver array, and these receivers 6 to 14 are
provided on the array cable 5 at a predetermined interval, A compass (not shown) is provided at
the receiver 10 located at the center thereof, and a drogue 15 is provided at the other end of the
array cable 5.
[0004]
04-05-2019
1
In this configuration, the receiver array consisting of the receivers 6 to 14 is horizontally and
linearly extended using the ocean current, in which case the drogue 15 acts as a resistor to the
ocean current and receives the waves. Serve as a helper for the instrument array.
The expanded receivers 6 to 14 receive the sound waves coming from the measurement target in
the sea, and the received signals are collected in the termination circuit 4 through the array cable
5 and multiplexed in the termination circuit 4.
[0005]
This multiplexed signal is sent to the buoy 2 via the suspension cable 3 and is sent as a radio
wave to a not-shown observation station by a not-shown radio device provided on the buoy 2.
The compass provided in the receiver 10 is used to measure the magnetic orientation in the
extension direction of the receiver array, and the compass signal is an array cable as well as the
reception signals of the receivers 6-14. 5, it is sent to the radio equipment in the buoy 2 via the
termination circuit 4 and the suspension cable 3 and is sent to the observation station.
[0006]
At the observation station, the signal processing device separates and demodulates the
multiplexed signal sent from the buoy 2 by the wireless device, and the reception signals of the
receivers 6 to 14 have a predetermined acoustic structure, ie, each predetermined reception. It
performs the phasing process according to the linear position of the device, and listens with the
beam output with the best S / N ratio. In addition, since the signal of the compass represents the
magnetic orientation in the extension direction of the receiver array, it is used to convert the
angle of the phase output at which the S / N ratio is most improved into an absolute azimuth, The
conical directivity pattern of the phased output can measure the approximate absolute
orientation of the measurement target.
[0007]
By the way, since such a horizontal linear receiver array has a total length of several hundred
meters, the subsea facility is initially stopped near the buoy 2 and the termination circuit 4 and
the ocean current is reached when the predetermined depth is reached. In order to maintain
horizontal straightness after expansion, the specific gravities of the wave receivers 6 to 14 and
04-05-2019
2
the draw 15 are set to values close to the specific gravity of seawater.
[0008]
The array cable 5 not only electrically connects the reception signals of the receivers 6 to 14 and
the compass signal of the compass and the termination circuit 4 but also performs acoustic
positioning of the receivers 6 to 14 There is.
That is, the array cable 5 between the wave receiver 6 and the wave receiver 7 determines the
distance between the wave receiver 6 and the wave receiver 7 at a predetermined linear space in
a state of being horizontally and linearly extended. Similarly, the array cable 5 is to determine the
respective receiver intervals to the receiver 13 and the receiver 14.
[0009]
FIG. 7 is a view for explaining the extension by the ocean current of the horizontal linear receiver
array suspended as described above, in which the horizontal axis represents the flow velocity and
the vertical axis represents the depth. The velocity at zero meter depth is called sea surface
velocity, and the velocity distribution of ocean velocity at each depth is shown by the solid line.
The velocity of the ocean current is generally high at shallow depths near the surface, slowing as
the depths increase, and considerably slower than the surface at several hundred meters below
sea level.
[0010]
When the horizontal linear receiver array is suspended in such a sea area, the receiver array is
made to flow at the drift velocity shown in the figure, and at this time, each part of the receiver
array is at its depth. Each time it receives the relative flow velocity shown by the broken line in
FIG. 7, it becomes the extended posture shown in FIG. In other words, the horizontal linear
receiver array will be elongated upon receiving the relative flow velocity at an array depth of
about several hundred meters.
[0011]
04-05-2019
3
Generally, the sea surface velocity is known to be in the order of 1 meter / second, so the relative
velocity in an array suspension depth of several hundred meters below the sea surface is about
0.3 meter / second. In this case, for example, assuming that the total length of the array cable 5
is 200 meters, 200 meters / 0.3 meters / second = 667 seconds1111 minutes in order to linearly
expand the receiver array according to the relative flow velocity. If it is necessary to extend
several hundred meters of the receiver array, it will take ten to twenty minutes or more.
[0012]
As described above, this type of horizontal linear receiver array requires a long time for
extension, but it is an area where sufficient and constant flow velocity can not be obtained. In this
case, even if the receiver array is extended with time, the attitude of the receiver array in the sea
is not horizontal and straight, and each receiver of the receiver array is expected to be straight. It
may not be possible to keep it in
[0013]
Therefore, if the incoming sound wave from the measurement target is received in such a state
and phase processing is performed in the observation station, a desired directivity pattern can
not be obtained, and as a result, the S / N ratio can not be improved. And there existed a problem
that the measurement of the direction of a measurement target became difficult.
The present invention has been made to solve such a problem, and it is possible to improve the S
/ N ratio even when each of the receivers of the receiver array can not be kept in the desired
linear position. It is an object of the present invention to realize a horizontal linear receiver array
that can be performed and can reliably measure the orientation of a measurement target.
[0014]
SUMMARY OF THE INVENTION In order to achieve the above object, according to a first aspect
of the present invention, there is provided an array in which a termination circuit is suspended
from a buoy floated on the sea surface through a suspension cable and one end is connected to
the termination circuit. In a horizontal linear receiver array for expanding a receiver array
consisting of a plurality of receivers provided in a cable using the ocean current, each of the
receivers is received at the position of the termination circuit and horizontal An impulse sound
source emitting impulse sound for detecting a receiver interval in a direction is disposed.
04-05-2019
4
[0015]
In the second invention, a termination circuit is suspended from a buoy floated on the sea surface
via a suspension cable, and the reception circuit comprises a plurality of wave receivers provided
in an array cable having one end connected to the termination circuit. In a horizontal linear
receiver array in which the detector array is expanded using the ocean current, an impulse for
detecting the distance between the receivers in the horizontal direction by causing the receivers
to receive at the position of the termination circuit An impulse for arranging a first impulse
sound source emitting a sound and causing it to be received by each of the receivers so as to
detect an amount by which each receiver is vertically displaced from a desired horizontal
position. A second impulse sound source emitting a sound is suspended from the first impulse
sound source.
[0016]
According to the first aspect of the present invention, when the receiver array is suspended from
the buoy floated on the sea surface through the suspension cable and the termination circuit and
then the impulse sound is emitted from the impulse sound source, Since the impulse sound is
received by each receiver with a time difference, if the distance between each receiver is detected
from this time difference at the observation station side, the phase difference processing is
performed based on this, the receiver array Even when each receiver can not be kept at the
desired linear position, the S / N ratio can be improved, and the direction of the measurement
target can be measured reliably.
[0017]
In the second aspect of the present invention, each of the receivers receives the impulse sound
from the second impulse sound source after suspending the receiver array together with the
termination circuit from the buoy floated on the sea surface through the suspension cable. The
impulse sound has different time differences depending on the distance between the first impulse
sound source and the second impulse sound source when the sound is expanded at a position
deviated in the vertical direction as compared to the case where it is expanded horizontally. Since
it is received, the observation station side can detect from this time difference that the receivers
extend at a position displaced in the vertical direction, and wait for each receiver to extend
horizontally. As in the first invention, it is possible to take measures such as performing phasing
processing using the first impulse sound source, so it is possible to improve the S / N ratio and
measure the direction of the target. .
[0018]
04-05-2019
5
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a side view showing a first embodiment of a horizontal linear receiver array according to
the present invention, in which each receiver of the receiver array is not sufficiently extended to
a desired linear position, The array cable has shown the state slackened in the horizontal
direction.
[0019]
In the figure, 1 is a sea surface, 2 is a buoy, 3 is a suspension cable, 4 is a termination circuit, 5 is
an array cable, 6 to 14 are receivers forming a receiver array, and 15 is a drogue, these are
conventional It is also the same as in the prior art that a compass (not shown) is provided to the
receiver 10 which is the same component as the one and located at the center.
An impulse sound source 16 suspended from the termination circuit 4 is electrically connected to
the termination circuit 4.
[0020]
FIG. 2 is a side sectional view showing the internal configuration of the impulse sound source 16.
In the figure, 29 is a case of the impulse sound source 16, 30 is an air chamber inside the case
29, 31 is a coil spring, 32 is a coil spring 31. It is a rod attached to one end, and the other end of
the coil spring 31 is fixed inside the housing 29.
Reference numeral 33 denotes an impactor fixed at a predetermined position of the rod 32, and
reference numeral 34 denotes a stopper for locking the free end of the rod 32. This stopper is
operated by a drive mechanism (not shown).
[0021]
04-05-2019
6
The impulse sound from this impulse sound source 16 is generated as follows.
That is, when the drive mechanism is activated by a command signal from the observation station
or a timer, the stopper 34 is detached from the free end of the rod 32, and the rod 32 is rotated
by the force of the coil spring 31 as shown by a dotted line. The impacting body 33 attached to
32 collides with the inner wall surface of the housing 29 and emits an impulse sound into the
sea.
[0022]
The distance between the termination circuit 4 and the wave receiver 6 is set to be sufficiently
larger than the distance between the termination circuit 4 and the impulse sound source 16 so
that the impulse sound propagates along the array cable 5, and At least the housing 29 and the
impacting body 33 are preferably made of metal in order to generate an impulse sound of a
predetermined magnitude. Next, the operation of the above-described configuration will be
described.
[0023]
First, the termination circuit 4 is suspended from the buoy 2 floated on the sea surface 1 via the
suspension cable 3 and from the receivers 6 to 14 provided at predetermined intervals on the
array cable 5 connected to the termination circuit 4 The receiver array is elongated by ocean
current. At this time, as described above, the drogue 15 acts as a resistor against the ocean
current and plays a role in assisting the extension of the receiver array.
[0024]
However, in an area where sufficient and constant flow velocity can not be obtained, even if the
receiver array is extended over time, the attitude of the receiver array in the ocean is not
horizontal and linear, and It may not be possible to keep each receiver of the wave array in a
desired linear position. Therefore, in the present embodiment, after the receiver array is
suspended together with the termination circuit 4, after a predetermined time has elapsed, the
impulse sound source 16 is introduced into the water as described above by a command signal
from an observation station (not shown) or a timer. An impulse sound is emitted, and this
04-05-2019
7
impulse sound is received by each of the receivers 6-14.
[0025]
FIG. 3 is an explanatory view showing the reception waveform of the impulse sound in each of
the receivers 6-14. As can be seen in this figure, the receiver 7 receives the impulse sound from
the impulse source 16 delayed by time T1 with respect to the receiver 6, and the receiver 8
receives time impulse T2 with respect to the receiver 7. The impulse sound is received late, and
the reception time is sequentially delayed until the wave receiver 13, and the wave receiver 14
receives the impulse sound with a delay of time T8 to the wave receiver 13.
[0026]
Since these delay times T1 to T8 correspond to the receiver spacing 受 speed of sound
(approximately 1500 meters / second in the sea), they represent the spacing between the
respective receivers. However, when the receiver array is not sufficiently extended, the distance
between the respective receivers is shorter than the distance when the receiver array is
sufficiently extended, and hence the delay time T1 to T8 of the reception of the impulse sound in
FIG. Also, the value is smaller than when the receiver array is sufficiently extended.
[0027]
The impulse sound received by each of the receivers 6 to 14 in this manner is sent as a received
pulse signal to the wireless device in the buoy 2 via the array cable 5, the termination circuit 4
and the suspension cable 3, and the observation station Sent to Therefore, by detecting the
receiver spacing from the spacing of this received pulse signal in the signal processor of the
observation station, based on that, the received signals from the measurement targets received
by the receivers 6 to 14 are subsequently adjusted. Even when each of the receivers 6 to 14 of
the receiver array is not elongated to the desired linear position, a directivity pattern according
to the acoustic structure of the receiver array can be obtained, and the S / N ratio can be
obtained. It is possible to improve the ratio and to measure the orientation of the target.
[0028]
04-05-2019
8
The signal processing apparatus of the observation station in this case will be described with
reference to FIG. FIG. 4 is a block diagram of a signal processing apparatus provided in the
observation station, in which 18 is a phasing device, 19 to 27 are impulse detectors, and 28 is a
pulse interval calculator. This configuration is the same as the conventional one in that the
reception signals of the respective receivers 6 to 14 sent by the wireless device of the buoy 2 are
supplied to the phasing device 18 to obtain phasing output, but the present invention In the
above, since the impulse sound source 16 is provided as described above, the impulse detectors
19 to 27 and the pulse interval calculator 28 are provided in the signal processing apparatus,
and among the received signals of the receivers 6 to 14 Impulse noise is detected by the impulse
detectors 19 to 27, and the shortening ratio of the receiver intervals of the respective receivers 6
to 14 is calculated by the pulse interval calculator 28, and the calculated shortening ratio data is
phased. The data is sent to the unit 18 and the phasing processing is performed in the phasing
unit 18 based on this data.
[0029]
More specifically, the impulse detectors 19 to 27 detect the leading edge of the reception pulse
signal of each of the receivers 6 to 14 described in FIG. 3 and send the detection signal to the
pulse interval calculator 28. The pulse interval calculator 28 measures the delay times T1 to T8
between the detection signals sent from the impulse detectors 19 to 27, and receives each
receiver 6 which is not elongated at the desired interval in the sea. The linear spacing of 14 is
measured, and the shortening ratio to the desired linear receiver spacing determined by the
length of the array cable 5 is calculated and supplied to the phasor 18.
[0030]
This shortening ratio represents the shortening ratio of the average linear spacing of each of the
receivers 6 to 14 which is not extended to the desired interval, and is usually between about 50%
and 100%. It becomes a value. The phasing device 18 changes and calibrates phasing parameters
such as delay lines in accordance with the shortening rate received from the pulse interval
calculator 28, and performs phasing processing to obtain phasing outputs B1 to BM.
[0031]
04-05-2019
9
Here, the linear receiver spacing along the array axis when the respective receivers 6 to 14 of the
receiver array do not extend to the desired spacing in the sea is on average by the shortening
rate Although the beam width of the directional pattern of phasing outputs B1 to BM becomes
wider in the target acoustic frequency band because it becomes shorter, there is no problem in
measurement. Therefore, according to this, as described above, even when each of the receivers
6 to 14 of the receiver array does not extend to the desired linear position, the pointing
according to the acoustic structure of the receiver array It is possible to obtain a sex pattern,
improve the S / N ratio, and measure the orientation of the target.
[0032]
FIG. 5 is a side view showing a second embodiment of the horizontal linear wave receiver array
according to the present invention, wherein the impulse sound source 16 is a first impulse sound
source, and the same structure as that below the first impulse sound source 16 The second
impulse sound source 17 is disposed vertically suspended at an interval d, and is electrically
connected to the termination circuit 4.
[0033]
In this embodiment, each of the receivers 6-14 of the receiver array is not sufficiently extended
to the desired linear position, and each receiver 6-14 is expanded horizontally as shown by the
broken line and black circle. The extended state is effective when the array cable 5 is deviated in
the vertical direction, and FIG. 5 shows a state of being slackened downward as an example.
That is, after suspending the receiver array together with the termination circuit 4 from the buoy
2 floated on the sea surface 1 via the suspension cable 3 and after a certain period of time, a
command signal from an observation station (not shown) or a timer etc. An impulse sound is
emitted from the second impulse sound source 17 into the sea, and this impulse sound is
received by each of the receivers 6-14.
[0034]
In this case, if, for example, the receivers 7 and 8 are in the horizontal positions 7a and 8a, the
reception pulse signal has a time delay corresponding to the distance difference of d1. When the
receivers 7 and 8 are lowered below the horizontal positions 7a and 8a by slacking downward as
shown in FIG. 5, the time lag corresponds to the distance difference of d2. That is, when the array
04-05-2019
10
cable 5 is slackened downward as in the example of FIG. 5 and the receiver array is at the
lowered position, and conversely, when it is at the upwardly expanded position, the second
impulse sound source The time delay of the received pulse signal between each of the receivers 6
to 14 by 17 has a different value depending on the vertical distance d with respect to when the
receiver array is in the horizontal state.
[0035]
On the other hand, assuming that the wave receiver array is horizontal and linear, the phase
shifter 18 provided in the signal processing apparatus on the observation station side described
in FIG. In order to perform phasing processing based on the shortening rate obtained from the
received pulse signals of the wave devices 6 to 14, as shown in FIG. 5, when the array cable 5 is
slackened downward and the wave receiver array is in the lowered position Requires the
cancellation of the phasing process or another process.
[0036]
Therefore, as described above, the second impulse sound source 17 is vertically suspended from
the first impulse sound source 16, and the impulse sound of the second impulse sound source 17
is received by each of the receivers 6 to 14, If the reception pulse signal is input to the pulse
interval calculator 28 by the impulse detectors 19 to 27 shown in FIG. 4 to calculate each
receiver interval, the array cable 5 is slackened downward or bulging upward. Since each of the
receivers 6 to 14 resulting from this can detect the amount of displacement from the horizontal
position, for example, wait until the receiver array is horizontally extended, and then emit
impulse sound from the first impulse sound source 16 By performing the above-mentioned
phasing process, it is possible to improve the S / N ratio and to measure the direction of the
target.
[0037]
In each of the above-described embodiments, although the receiver array including nine
receivers 6 to 14 has been described, the present invention is not limited to this, and the
receivers may be arranged in a larger number than this. Is common.
Further, as shown in FIG. 2, the impulse sound sources 16 and 17 in each of the embodiments
described above are configured such that one set of a coil spring 31, a rod 32, an impacting body
33, a stopper 34, etc. However, it is also possible to adopt a configuration in which impulse
sound is emitted multiple times by providing a plurality of these.
04-05-2019
11
[0038]
Furthermore, in each of the above-described embodiments, the impulse sound source 16 is
provided independently of the termination circuit 4, but the coil spring 31, the rod 32, the
impact body 33, the stopper 34, etc. are arranged in the housing of the termination circuit 4. It is
also possible to use a piezoelectric transducer instead of mechanical one by means of the coil
spring 31, the rod 32, the impacting body 33, the stopper 34 and so on.
[0039]
As described above, according to the first invention of the present invention, an impulse for
emitting impulse sound to be received by each receiver at the position of the termination circuit
and for detecting the receiver spacing in the horizontal direction In the configuration in which
the sound source is arranged, after the receiver array is suspended from the buoy floated on the
sea surface via the suspension cable and the termination circuit and then the impulse sound is
emitted from the impulse sound source, this impulse sound is received by each receiver. Since
reception is performed with a time difference, if the distance between each receiver is detected
from this time difference on the observation station side and phasing processing is performed
based on that, each receiver of the receiver array is expected. Even when the linear position can
not be maintained, the S / N ratio can be improved, and the target orientation can be measured.
[0040]
According to a second aspect of the present invention, a first impulse sound source for emitting
impulse sound to be received by each receiver at a position of a termination circuit and detecting
an interval between each receiver in the horizontal direction is arranged, A second impulse sound
source for emitting impulse sound to be received by each of the receivers and for detecting an
amount by which each receiver is displaced in the vertical direction from a desired horizontal
position; In the configuration suspended from the impulse sound source, when the receiver array
is suspended from the buoy floated on the sea surface through the suspension cable and the
termination circuit and then the impulse sound is emitted from the second impulse sound source,
each wave receiver When extending at a position deviated in the vertical direction compared to
when extending horizontally, the impulse sound has a different time difference depending on the
distance between the first impulse sound source and the second impulse sound source. To be
received Therefore, from this time difference, the observation station can detect that each
receiver is elongated at a position deviated in the vertical direction, and wait for each receiver to
extend horizontally first. Since it is possible to take measures such as performing phasing
processing using the first impulse sound source as in the invention, the S / N ratio can be
improved, and the direction of the target can be measured. can get.
04-05-2019
12
04-05-2019
13
Документ
Категория
Без категории
Просмотров
0
Размер файла
24 Кб
Теги
jph07181248
1/--страниц
Пожаловаться на содержимое документа