JPH07117583B2 - Horizontal linear receiver array - Google Patents

Description

Detailed Description of the Invention

[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 As a conventional linear linear receiver array of this type, there is one disclosed in, for example, Japanese Patent Publication No. 1-20531. FIG. 6 shows a side view thereof. In the figure, 1 is the sea surface, 2 is a buoy floated on the sea surface, 3 is a suspension cable, 4 is a termination circuit, and this termination circuit 4 is a suspension cable 3. It is hung from the buoy 2 through.

Reference numeral 5 denotes an array cable whose one end is connected to the terminating circuit 4, and reference numerals 6 to 14 denote wave receivers constituting a wave receiver array. These wave receivers 6 to 14 are arranged on the array cable 5 at predetermined intervals. A compass (not shown) is provided in the wave receiver 10 provided at the center thereof, and a drogue 15 is provided at the other end of the array cable 5.

In this configuration, the wave receiver array consisting of the wave receivers 6 to 14 extends horizontally and linearly by utilizing the ocean current. At this time, the drogue 15 functions as a resistor against the ocean current. , Helps to extend the array of receivers. The extended receivers 6 to 14 receive the sound waves coming from the measurement target in the sea, and the received signals are collected by the terminal circuit 4 via the array cable 5 and multiplexed by the terminal circuit 4.

This multiplexed signal is sent to the buoy 2 via the suspension cable 3 and is sent as a radio wave to an observation station (not shown) by a radio device (not shown) provided in the buoy 2. The compass provided in the wave receiver 10 is used to measure the magnetic direction in the propagation direction of the wave receiver array,
The compass signal is sent to the wireless device in the buoy 2 via the array cable 5, the terminating circuit 4 and the suspension cable 3 in the same manner as the received signals of the wave receivers 6 to 14, and is sent to the observation station.

In the observation station, the multiplexed signal sent from the buoy 2 by the radio device is separated and demodulated by the signal processing device, and the reception signals of the wave receivers 6 to 14 have a predetermined acoustic structure, that is, a predetermined acoustic structure. The phasing process is performed according to the linear position of each wave receiver, and the beam output with the best S / N ratio is heard.
Further, since the signal of the compass represents the magnetic azimuth in the propagation direction of the receiver array, it is used for converting the angle of the phase output having the best S / N ratio to the absolute azimuth, and is obtained by this. The conical directional pattern of the phasing output makes it possible to measure the approximate absolute orientation of the measurement target.

By the way, since such a horizontal linear type receiver array has a total length of several hundred meters, it is stopped near the buoy 2 and the termination circuit 4 at the beginning of the undersea facility and reaches a predetermined depth. At that time, the ocean current is used to extend the water horizontally and linearly, but in order to maintain the horizontal linearity after the extension, the specific gravity of the wave receivers 6 to 14 and the drogue 15 is set to a value close to the specific gravity of seawater. ing.

Further, the array cable 5 includes wave receivers 6-1.
In addition to electrically connecting the reception signal of No. 4 and the compass signal of the compass to the terminal circuit 4, the acoustic positioning of the wave receivers 6 to 14 is also performed. That is, the array cable 5 between the wave receiver 6 and the wave receiver 7 is horizontally and linearly extended, and the distance between the wave receiver 6 and the wave receiver 7 is set to a predetermined linear distance. Similarly, the array cables 5 up to the wave receivers 13 and 14 determine the wave receiver intervals.

FIG. 7 is a diagram for explaining the extension of the horizontal linear receiver array suspended as described above due to the ocean current.
The horizontal axis represents the flow velocity, and the vertical axis represents the depth. The flow velocity at the depth of zero meter is called the sea surface flow velocity, and the flow velocity distribution of the sea current velocity at each depth is shown by the solid line. The current velocity is generally high at shallow depths near the sea level, slowing down as the depth increases, and becomes considerably slower at depths of several hundred meters below the sea level.

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. At this time, each part of the receiver array is , Receives the relative flow velocity indicated by the broken line in FIG. 7 for each depth, and assumes the extension posture shown in FIG. That is, the horizontal rectilinear receiver array will be extended by the relative flow velocity at an array depth of about several hundred meters.

It is generally known that the sea surface velocity is about 1 m / sec. Therefore, the relative velocity at an array suspension depth of several hundred meters below the sea level is about 0.3 m / sec. In this case, for example, if the total length of the array cable 5 is 200 meters, in order to linearly extend the receiver array according to the relative flow velocity, 200 meters / 0.3 meters / second = 667 seconds≈11
This will take a minute, and if a receiver array of several hundred meters is to be extended, it will take ten minutes to 20 minutes or more.

[0012]

As described above, this type of horizontal linear receiver array requires a long time for spreading, but the sea area where sufficient and constant flow velocity cannot be obtained. So, even if the receiver array is extended over time, the posture of the receiver array in the sea does not become horizontal and linear, and each receiver of the receiver array is aligned in the desired straight line. It may not be possible to keep the target position.

Therefore, when the sound wave coming from the measurement target is received and the phase processing is performed at the observation station in such a state, a desired directivity pattern cannot be obtained, and as a result, the S / N ratio can be improved. There is a problem that it becomes impossible and it becomes difficult to measure the direction of the measurement target. The present invention has been made to solve such a problem. Even if each receiver of the receiver array cannot be kept in a desired linear position, S
It is an object of the present invention to realize a horizontal linear receiver array capable of improving the / N ratio and reliably measuring the azimuth of a measurement target.

[0014]

In order to achieve this object, the first invention is an array in which a terminating circuit is suspended from a buoy floating on the sea surface via a suspension cable and one end is connected to this terminating circuit. In a horizontal linear wave receiver array that extends a wave receiver array consisting of a plurality of wave receivers provided on a cable by utilizing the ocean current, the wave is received by each of the wave receivers at the position of the terminating circuit and is horizontally received. It is characterized in that an impulse sound source that emits an impulse sound for detecting the receiver interval in the direction is arranged.

A second aspect of the invention is that a terminating circuit is suspended from a buoy floated on the sea surface via a suspending cable, and a plurality of wave receivers provided in an array cable having one end connected to the terminating circuit. In a horizontal linear wave receiver array for extending the wave receiver array utilizing the ocean current, each wave receiver is received at the position of the terminal circuit, and the interval between the wave receivers in the horizontal direction is detected. A first impulse sound source that emits an impulse sound is arranged and received by each of the wave receivers, and the amount of deviation of each wave receiver from the intended horizontal position in the vertical direction is detected. A second impulse sound source that emits an impulse sound for hanging is suspended from the first impulse sound source.

[0016]

In the first invention having such a structure, when the receiver array is hung together with the termination circuit from the buoy floating on the sea surface via the suspension cable and the impulse sound is emitted from the impulse sound source, The impulse sound is received at each receiver with a time difference, so if the observation station detects the interval between the receivers from this time difference and performs phasing processing based on that, the receiver array Even if each wave receiver cannot be kept in the desired linear position, the S / N ratio can be improved and the azimuth of the measurement target can be reliably measured.

According to a second aspect of the present invention, after the wave receiver array is suspended from the buoy floating on the sea surface through the suspension cable together with the termination circuit, the impulse sound is emitted from the second impulse sound source. When the wave instrument is extended at a position displaced in the vertical direction compared to when it is horizontally extended, the impulse sound has a different time difference depending on the interval between the first impulse sound source and the second impulse sound source. Since it is received by the observation station, it can be detected on the observation station side that each wave receiver is extending at a position deviated in the vertical direction, so that each wave receiver is extended horizontally. Waiting until, as in the first aspect of the invention, the first impulse sound source is used to perform a phasing process or the like, so that the S / N ratio can be improved and the target azimuth can be measured. be able to.

[0018]

Embodiments will be described below with reference to the drawings. FIG. 1 is a side view showing a first embodiment of a horizontal linear wave receiver array according to the present invention, in which each wave receiver of the wave receiver array is not sufficiently extended to a desired linear position. The array cable is shown to be slack in the horizontal direction.

In the figure, 1 is the sea surface, 2 is a buoy, 3 is a suspension cable, 4 is a termination circuit, 5 is an array cable, and 6 to 1 are provided.
Reference numeral 4 denotes a wave receiver constituting a wave receiver array, 15 denotes a drogue, which are the same constituent elements as those of the conventional one, and the wave receiver 10 located at the center is provided with a compass (not shown). Is also the same as the conventional one. 16 is a termination circuit 4
It is an impulse sound source suspended from and is electrically connected to the termination circuit 4.

FIG. 2 is a side sectional view showing the internal structure of the impulse sound source 16, in which 29 is the impulse sound source 1.
6 is a housing, 30 is an air chamber inside the housing 29, 31 is a coil spring, 32 is a rod attached to one end of the coil spring 31, and the other end of the coil spring 31 is fixed inside the housing 29. ing. Reference numeral 33 is an impact body fixed to a predetermined position of the rod 32, and 34 is a stopper for locking the free end of the rod 32, and this stopper is operated by a drive mechanism (not shown).

The impulse sound from the impulse sound source 16 is generated as follows. That is, when the drive mechanism is activated by a command signal from an observation station or a timer, the stopper 34 is disengaged 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 the dotted line. Impact body 3 attached to 32
3 collides with the inner wall surface of the housing 29 and emits an impulse sound into the sea.

The distance between the terminal circuit 4 and the wave receiver 6 is set sufficiently larger than the distance between the terminal circuit 4 and the impulse sound source 16 so that the impulse sound propagates along the array cable 5. In addition, at least the housing 29 and the impact body 33 for generating an impulse sound of a predetermined volume.
Is preferably made of metal. Next, the operation of the above configuration will be described.

First, a termination circuit 4 is suspended from a buoy 2 floating on the sea surface 1 through a suspension cable 3, and the termination circuit 4 is suspended.
A wave receiver array consisting of wave receivers 6 to 14 provided at predetermined intervals on the array cable 5 connected to is extended by the ocean current. At this time, the drogue 15 acts as a resistance element against the ocean current and plays a role of helping the propagation of the receiver array, as described above.

However, in a sea area where a sufficient and constant flow velocity cannot be obtained, even if the receiver array is extended over time, the posture of the receiver array in the sea is horizontal and linear. As a result, each receiver of the receiver array may not be kept in the desired linear position. Therefore, in the present embodiment, after suspending the receiver array together with the termination circuit 4 and after a certain period of time elapses, the impulse sound source 16 is moved into the sea as described above by a command signal from an observation station (not shown) or a timer. An impulse sound is emitted, and the impulse sound is received by each of the wave receivers 6 to 14.

FIG. 3 is an explanatory diagram showing the received waveform of the impulse sound in each of the wave receivers 6-14. As shown in this figure, the wave receiver 7 receives the impulse sound from the impulse sound source 16 with a delay of time T1 with respect to the wave receiver 6,
The wave receiver 8 receives the impulse sound with a delay of the time T2 with respect to the wave receiver 7, and in the same manner, the reception time is sequentially delayed until the wave receiver 13, and the wave receiver 14 with respect to the wave receiver 13. Receives the impulse sound with a delay of time T8.

Since these delay times T1 to T8 correspond to the receiver interval / sound velocity (about 1500 m / sec in the sea), they represent the intervals between the receivers. However, if the receiver array is not fully extended,
The intervals between the respective wave receivers are shorter than the intervals when they are sufficiently expanded, and therefore, the delay time T1 to the reception of the impulse sound shown in FIG.
T8 is also smaller than when the receiver array is fully extended.

The impulse sound thus received by each of the wave receivers 6 to 14 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. , Sent to the observation station. Therefore, by detecting the receiver interval from the interval of the received pulse signals in the signal processing device of the observation station and phasing the received signals from the measurement targets received by the receivers 6 to 14 thereafter based on the detected receiver interval. , Even if each of the wave receivers 6 to 14 of the wave receiver array does not extend to a desired linear position, a directivity pattern according to the acoustic structure of the wave receiver array is obtained,
It is possible to improve the S / N ratio and measure the target azimuth.

The signal processing device of the observation station in this case will be described with reference to FIG. FIG. 4 is a block diagram of a signal processing device provided in the observation station, in which 18 is a phase shifter and 19-2.
Reference numeral 7 is an impulse detector, and 28 is a pulse interval calculator. This configuration is the same as the conventional one in that the reception signals of the wave receivers 6 to 14 sent by the radio device of the buoy 2 are supplied to the phase phasing device 18 to obtain a phasing output. Since the impulse sound source 16 is provided as described above,
The signal processor is provided with impulse detectors 19 to 27 and a pulse interval calculator 28, whereby the impulse sounds in the reception signals of the wave receivers 6 to 14 are detected by the impulse detectors 19 to 27. , Pulse interval calculator 28
To calculate the shortening rate of the wave receiver intervals of the wave receivers 6 to 14, and send the data of the calculated shortening rate to the phaser 18.
The phasing device 18 performs phasing processing based on this data.

More specifically, the impulse detectors 19 to 27 detect the leading edge of the received pulse signal of each of the wave receivers 6 to 14 described in FIG. 3, and send the detected signal to the pulse interval calculator 28. . The pulse interval calculator 28 measures the delay times T1 to T8 between the respective detection signals sent from the impulse detectors 19 to 27, and receives each of the wave receivers 6 to 6 which do not extend to the desired interval in the sea. The linear intervals of 14 are measured, and the shortening rate for the intended linear receiver interval determined by the length of the array cable 5 is calculated and supplied to the phase adjuster 18.

This shortening rate represents the rate of shortening of the average and linear intervals of the wave receivers 6 to 14 which have not spread to the desired interval, and is usually about 50% to 100%. It becomes a value between. The phasing device 18 changes and calibrates phasing parameters such as a delay line according to the shortening rate received from the pulse interval calculator 28, performs phasing processing, and performs a phasing output B.
1 to BM.

Here, each of the wave receivers 6 to 14 of the wave receiver array.
Since the linear receiver spacing along the array axis when it does not extend to the desired spacing in the sea is shortened by the shortening rate on average, the phasing output B1 in the target acoustic frequency band The beam width of the BM directional pattern is wide,
There is no problem in measurement. Therefore, according to this, even if each of the wave receivers 6 to 14 of the wave receiver array is not extended to the desired linear position as described above, the orientation according to the acoustic structure of the wave receiver array is obtained. It is possible to obtain a sex pattern, improve the S / N ratio, and measure the target azimuth.

FIG. 5 is a side view showing a second embodiment of a horizontal linear type receiver array according to the present invention. The impulse sound source 16 is a first impulse sound source, and the first impulse sound source 16 is placed below the impulse sound source 16. The second impulse sound source 17 having the same structure is arranged so as to be vertically hung at a distance d and electrically connected to the termination circuit 4.

In this embodiment, each receiver 6 in the receiver array is
˜14 are not sufficiently extended to the intended linear position, and the array cables 5 are biased in the vertical direction with respect to the state where the receivers 6 to 14 are horizontally extended as indicated by the broken line and the black circle. This is effective in the opened state, and FIG. 5 shows a state in which the sheet is slackened downward as an example. That is, after suspending the receiver array together with the termination circuit 4 from the buoy 2 floating on the sea surface 1 through the suspension cable 3, after a certain time has passed, a command signal from an observation station (not shown) or a timer is used. An impulse sound is emitted from the second impulse sound source 17 into the sea, and the impulse sound is received by each of the wave receivers 6 to 14.

In this case, for example, the wave receivers 7 and 8 are 7a.
And 8a at the horizontal position, the received pulse signal is delayed by a time corresponding to the distance difference d1.
When the array cable 5 is slackened downward as shown in FIG. 5 and the wave receivers 7 and 8 are lower than the horizontal positions 7a and 8a, there is a time delay corresponding to the distance difference d2. In other words, when the array cable 5 is slackened downward as in the example of FIG. 5 and the receiver array is in the lowered position, and conversely, although not shown, it is in the bulged position above, the second
The time delay of the received pulse signal between each of the wave receivers 6 to 14 due to the impulse sound source 17 has a different value depending on the vertical interval d when the wave receiver array is in the horizontal state.

On the other hand, the phase adjuster 18 provided in the signal processing device on the observation station side described with reference to FIG. 4 assumes that the receiver array is horizontal and linear, and the first impulse sound source 1
Since the phasing process is performed based on the shortening rate obtained from the received pulse signals of the respective wave receivers 6 to 14 by 6, the array cable 5 is slackened downward and the wave receiver array is lowered as shown in FIG. If it is in the position, the phasing process must be stopped or another method must be used.

Therefore, as described above, the second impulse sound source 17 is suspended vertically from the first impulse sound source 16.
The impulse sound of the second impulse sound source 17 is received by each of the wave receivers 6 to 14, and the received pulse signal is input to the pulse interval calculator 28 by the impulse detectors 19 to 27 shown in FIG. By calculating the wave receiver spacing, it is possible to detect the amount of deviation of each of the wave receivers 6 to 14 from the horizontal position due to the slack of the array cable 5 or the bulge of the array cable 5. Waits until the vessel array spreads horizontally, and then the first impulse sound source 16 emits an impulse sound to perform the phasing process.
It is possible to improve the / N ratio and measure the target azimuth.

In each of the above-described embodiments, the wave receiver array including the nine wave receivers 6 to 14 has been described, but the number of wave receivers is not limited to this, and the wave receivers may be arranged in a larger number. Is generally used. Further, the impulse sound sources 16 and 17 of each of the above-described embodiments have a configuration in which one set of a coil spring 31, a rod 32, an impact body 33, a stopper 34, and the like are arranged in a housing 29, as shown in FIG. But,
It is also possible to provide a plurality of sets of these to emit the impulse sound a plurality of times.

Further, 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 3 are provided in the housing of the termination circuit 4.
3, the stopper 34 and the like may be arranged, and the impulse sound sources 16 and 17 may be the coil spring 3 as well.
1, a piezoelectric transducer may be used instead of a mechanical one including the rod 32, the impact body 33, the stopper 34, and the like.

[0039]

As described above, according to the first aspect of the present invention, the impulse sound is emitted at the position of the terminating circuit by each of the receivers to detect the receiver interval in the horizontal direction. When the sound source is arranged, the impulse sound is emitted from the impulse sound source after suspending the receiver array together with the terminal circuit via the suspension cable from the buoy floating on the sea surface, and this impulse sound is emitted at each receiver. Since the signals are received with a time lag, the interval between the receivers is detected from this time difference on the observation station side, and if the phasing process is performed based on this, each receiver in the receiver array is Even if the linear position cannot be maintained, the S / N ratio can be improved and the target azimuth can be measured.

According to the second aspect of the invention, the first impulse sound source is arranged at the position of the terminating circuit to emit an impulse sound to be received by each of the receivers and to detect the interval between the receivers in the horizontal direction. And a second impulse sound source that emits an impulse sound for detecting the amount of deviation of each of the wave receivers in the vertical direction from the desired horizontal position by receiving the wave by the wave receivers. As a configuration of suspending from the first impulse sound source, after suspending the receiver array together with the termination circuit from the buoy floating on the sea surface via the suspending cable, when the impulse sound is emitted from the second impulse sound source, When the wave receiver is extended at a position deviated in the vertical direction compared to when it is horizontally extended, the impulse sound has a different time difference depending on the interval between the first impulse sound source and the second impulse sound source. Received with Therefore, it is possible for the observation station to detect from the time difference that each receiver is extending at a position biased in the vertical direction, and thus wait until each receiver is extended horizontally. As described in the first aspect of the invention, since the phasing process is performed using the first impulse sound source, the S / N ratio can be improved and the target azimuth can be measured. The effect of being able to be obtained is obtained.

[Brief description of drawings]

FIG. 1 is a side view showing a first embodiment of a horizontal rectilinear receiver array according to the present invention.

FIG. 2 is a side sectional view showing an internal configuration of an impulse sound source used in the embodiment of FIG.

FIG. 3 is an explanatory diagram showing a received waveform of an impulse sound by each wave receiver in the embodiment of FIG.

FIG. 4 is a block diagram of a signal processing device provided in an observation station.

FIG. 5 is a side view showing a second embodiment of a horizontal linear receiver array according to the present invention.

FIG. 6 is a side view showing a conventional horizontal linear receiver array.

FIG. 7 is a diagram for explaining the extension of the horizontal linear receiver array due to the ocean current.

[Explanation of symbols]

 1 sea surface 2 buoy 3 suspension cable 4 termination circuit 5 array cable 6-14 receiver 15 drogue 16 impulse sound source (first impulse sound source) 17 impulse sound source (second impulse sound source)

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical indication location H04R 1/44 330 HL 9382-5J G01S 7/52 U (72) Inventor Katsu Okubo Tokyo Port 1-7-12 Toranomon-ku, Oki Electric Industry Co., Ltd. (56) Reference JP-A-62-108171 (JP, A)

Claims (2)

[Claims] 1. A receiver array comprising a plurality of receivers provided on an array cable, wherein a terminating circuit is suspended from a buoy floating on the sea surface via a suspending cable, and one end is connected to the terminating circuit. In a horizontal linear receiver array that extends using ocean current, an impulse that emits an impulse sound for detecting the receiver interval in the horizontal direction by being received by each of the receivers at the position of the termination circuit. A horizontal linear receiver array characterized by arranging sound sources. 2. A receiver array comprising a plurality of receivers provided on an array cable, wherein a terminating circuit is suspended from a buoy floating on the sea surface via a suspension cable, and one end is connected to the terminating circuit. In a horizontal linear receiver array that extends using ocean current, emits an impulse sound for detecting the interval between the receivers in the horizontal direction by receiving the receivers at the position of the termination circuit. A first impulse sound source is arranged and is received by each of the wave receivers, and an impulse sound for detecting the amount of each wave receiver being vertically displaced from an intended horizontal position is emitted. The second impulse sound source
Horizontal linear receiver array characterized by being hung from the impulse sound source.