JPS58122483A - Sound listening system of active sonar - Google Patents
Sound listening system of active sonarInfo
- Publication number
- JPS58122483A JPS58122483A JP347882A JP347882A JPS58122483A JP S58122483 A JPS58122483 A JP S58122483A JP 347882 A JP347882 A JP 347882A JP 347882 A JP347882 A JP 347882A JP S58122483 A JPS58122483 A JP S58122483A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- sonar
- sound
- listening
- target
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S15/00—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems
- G01S15/02—Systems using the reflection or reradiation of acoustic waves, e.g. sonar systems using reflection of acoustic waves
- G01S15/50—Systems of measurement, based on relative movement of the target
- G01S15/52—Discriminating between fixed and moving objects or between objects moving at different speeds
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Acoustics & Sound (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、アクテイプソーナーにおいて、探知目標の運
動によって生ずる反響音中のドツプラー信号の判別を容
易ならしめる聴音方式に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a listening method for an active sonar that facilitates discrimination of Doppler signals in reverberant sounds caused by the movement of a detection target.
アクティプソーナー(以下、単にソーナーという。)は
、周知のように、水中の水平方向に探知用の音波を発射
し、水中に存在する目標物体からの反響音を受信して、
”その方位、距離等をPPI(Plan positi
on Indicator )等の映像表示装置に表示
するとともに、その反響音を適当な可聴周波数の聴音信
号に変侠して聴取し、その音色。As is well known, an active sonar (hereinafter simply referred to as a sonar) emits sound waves for detection in the horizontal direction underwater, receives echoes from a target object underwater,
``The direction, distance, etc. are determined by PPI (Plan position).
On Indicator), the echoes are displayed on a video display device such as an audio signal, and the reverberated sound is changed to an audible signal of an appropriate audible frequency and listened to.
音感的な鋭さ、ドツプラー効果の有無等により、探知す
べき水中目標がどのようなものであるかを類別するもの
である。The type of underwater target to be detected is classified based on the acoustic sharpness, presence or absence of the Doppler effect, etc.
特に、水中目標が移動物体である場合には、ドツプラー
効果の有無の判別は、目標探知のために欠かせない重要
な手段である。Particularly when the underwater target is a moving object, determining the presence or absence of the Doppler effect is an important means indispensable for target detection.
ここで、従来の聴音方式について説明する。Here, a conventional listening method will be explained.
第1図は、従来方式による聴音装置の一例のブロック図
、第2図は、その周波数スペクトル図である。FIG. 1 is a block diagram of an example of a conventional hearing device, and FIG. 2 is a frequency spectrum diagram thereof.
まず、受信したソーナーの反響音は、変調器IAにより
局部発振器2人の発振信号と混合して廟波数変換(ヘテ
ロダイン)を行い、聴取しようとする可聴周波数成分を
F波器3Aを介して抽出し、増幅器4Aで増幅したのち
、スピーカー5Aで当該聴音は号として聴取するように
なっている。First, the received sonar echo sound is mixed with the oscillation signals of two local oscillators by the modulator IA, subjected to wave number conversion (heterodyning), and the audible frequency component to be heard is extracted via the F wave generator 3A. After being amplified by the amplifier 4A, the audible sound is heard as a signal by the speaker 5A.
ここで扱う周波数の関係を第2図で説明する。The relationship between frequencies handled here will be explained with reference to FIG.
受信信号のうち、残響または海底反射等の停止1辺体か
らの反響音は、ソーナーの発信周波数f。Among the received signals, the echoes from the stationary monolateral, such as reverberation or seafloor reflection, are at the sonar's transmission frequency f.
紫中心としてスペクトラム11のように分布をしている
。The distribution is as shown in spectrum 11 with the purple center.
このとき、水中移動物体からの反響音は、スペクトラム
12のように当該移動物体、ソーナー彼我の相対速度V
に起因するドツプラー周波数偏移量Δfだけ、その周波
数成分が偏移している。At this time, the echo sound from the underwater moving object is expressed by the relative velocity V of the moving object, the sonar, and ourselves, as shown in spectrum 12.
The frequency component is shifted by the amount of Doppler frequency shift Δf caused by .
このような周波数成分の受信信号が変調器IAに入力す
ると、局部発振器2人の発振周波数flと混合し、その
差の周波数(f o+Δf)−flなる可聴周波数に変
換され、残響信号スペクトラム13と目標反響音スペク
トラム14とが得られる。When a received signal with such a frequency component is input to the modulator IA, it is mixed with the oscillation frequency fl of the two local oscillators, and converted into an audible frequency of the difference frequency (f o + Δf) - fl, and the reverberant signal spectrum 13 and A target reverberant sound spectrum 14 is obtained.
スピーカ5Aでの聴音による、目標の移動物体か否かの
判別(識別)は、前記の残響スペクトラム13の周波数
と目標反響音スペクトラム14の周波数とを耳で聴き分
けることによってなされる。Discrimination (identification) as to whether or not it is a target moving object is made by hearing the frequency of the reverberation spectrum 13 and the frequency of the target reverberant sound spectrum 14 by listening to the sound through the speaker 5A.
しかるに、水中移動物体のドツプラー周波数個Δf =
(2v/ CO) ・fo ・1川・・(1)
で示されることは公知である。However, the Doppler frequency of the underwater moving object Δf =
(2v/CO) ・fo ・1 river...(1)
It is well known that
一方、遠距離の目標探知を目的としたアクティプソーナ
ーでは、(1)式から明らかなように、その発信周波数
foが高いほどドツプラー周波数偏移量Δfが大となる
反面、音替減衰量も大となるので、むしろ発信周波数f
oを低くした方が確実に反響音を聴取できて有効である
が、また、逆に発信周波数foを下げるとドツプラー効
果の判別が更に困難となる。On the other hand, in an active sonar aimed at detecting a target at a long distance, as is clear from equation (1), the higher the transmission frequency fo is, the larger the Doppler frequency deviation amount Δf is, but the attenuation amount is also larger. Therefore, rather, the transmission frequency f
It is more effective to lower o so that the reverberant sound can be heard more reliably, but conversely, lowering the oscillation frequency fo makes it more difficult to distinguish the Doppler effect.
本発明の目的は、上記した従来技術の困難を除き、比較
的に低い周波数の発射音波でも探知目標からの反響音中
のドツプラー信号の判別を容易ならしめるアクテイプノ
ーナ−の聴音方式を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a listening method for actuator noise that eliminates the difficulties of the prior art described above and makes it easy to distinguish Doppler signals in echoes from a detection target even with emitted sound waves of a relatively low frequency. be.
本発明の特徴は、探知目標からの反響音のヘテロダイン
受信を行い、これを所望の可聴音とじて変換・出力する
2組の聴音装置を設け、それらの各局部発振周波数を、
それぞれ、ンーナー発信周波数に対して上下に等しい周
波数差をもつものとし、上記各聴音装置からの聴音信号
を個別に聴取しうるようにしたアクテイブソーナーの聴
音方式これを要するに、探知目標からのドツプラー周波
数成分を各聴音装置によって互に偏移方向が離反するよ
うにした聴音信号を得て、それらを分離して聴取・比較
することにより、ドツプラー周波数偏移を容易・確実に
判別しうるようにするものである。A feature of the present invention is that two sets of listening devices are provided to perform heterodyne reception of echo sounds from the detection target, convert and output the echo sounds as desired audible sounds, and each local oscillation frequency is
The active sonar listening method has an equal frequency difference above and below the sonar transmission frequency, and allows the listening signals from each of the listening devices mentioned above to be heard individually. To easily and reliably identify Doppler frequency shifts by obtaining listening signals whose components are shifted in different directions by each listening device, and listening and comparing them separately. It is something.
以下、本発明の実施例を第3図および第4図に基づいて
説明する。Embodiments of the present invention will be described below with reference to FIGS. 3 and 4.
第3図は、本発明に係るアクティプソーナーの聴音方式
による聴音部の一実施例のブロック図、第4図は、その
周波数スペクトル図である。FIG. 3 is a block diagram of an embodiment of a sound listening section of an active sonar according to the present invention using a sound listening method, and FIG. 4 is a frequency spectrum diagram thereof.
ここで、IA、IBは、それぞれ、聴音装置A。Here, IA and IB are respectively listening devices A.
Bt[成する変調器、2A、2Bは、同局部発振 □器
、3A、3Bは、同p波器、4A、4Bは、同増幅器、
5は、入力信号を左右分離して出力する受話器RA、R
Bを有するヘッドホンである。2A and 2B are the same local oscillator, 3A and 3B are the same P wave generator, 4A and 4B are the same amplifier,
5 are receivers RA and R that separate left and right input signals and output them;
This is a headphone having B.
変調器IA、局部発振器2A、P波器3A、増幅器4A
からなる聴音装置Aの動作は、薊述の第1図および第2
図によシ説明したとおりである。本発明では、受信信号
を更に別の聴音装置Bによっても処理するようにしてい
る。Modulator IA, local oscillator 2A, P wave generator 3A, amplifier 4A
The operation of the listening device A consisting of
As explained in the figure. In the present invention, the received signal is further processed by another listening device B.
すなわち、受信信号の一部は、変調器IBにも入力し、
ここで局部発振器2Bが発振する周波数f2でヘテロダ
インをした後、受信信号との差の周波数をF波器3Bを
介して抽出し、増幅器4Bで増幅する。That is, a part of the received signal is also input to the modulator IB,
After performing heterodyne at the frequency f2 oscillated by the local oscillator 2B, the frequency difference from the received signal is extracted via the F wave generator 3B and amplified by the amplifier 4B.
増幅器4A、4Bの出力は、それぞれ、ヘッドホーン5
の受話器RA、RBで片方ずつ分離シテ聴取する。The outputs of amplifiers 4A and 4B are respectively output to headphones 5.
Listen to each phone separately using handsets RA and RB.
この場合、局部発振器2人の発振周波数f1 +局部発
振器2Bの発振周波数f2は、次式のようにソーナー発
信周波数foを中心として上下に等しい周波数差をもつ
ように、
f、 −f1= f2− f、 ・・−・
・・−・(21となるように設定する。In this case, the oscillation frequency f1 of the two local oscillators + the oscillation frequency f2 of the local oscillator 2B is expressed as f, -f1=f2- so that there is an equal frequency difference above and below the sonar oscillation frequency fo as the center, as shown in the following equation. f,...
...-(Set it to be 21.
このようにすることにより、聴音信号の周波数スペクト
ラムは、第4図に示すように、残響スペクトラム13に
対して目標反響音スペクトラム15が得られる。すなわ
ち、これは聴音装置Aで得られる目標反響音スペクトラ
ム14に対して残響スペクトラム13を挾んで対称な関
係となる。By doing this, the target reverberant sound spectrum 15 is obtained with respect to the reverberant spectrum 13 as the frequency spectrum of the audible signal, as shown in FIG. That is, this is a symmetrical relationship with respect to the target reverberation spectrum 14 obtained by the listening device A, with the reverberation spectrum 13 in between.
熱論、目標が停止物体であれば、目標反響音スペクトラ
ム14.15は、残響スペクトラム13に一致し、また
、目標が移動物体であって、彼我の相対速力Vが増大す
るほど、目標反響音スペクトラム14.15は互に離反
するようになる。In theory, if the target is a stationary object, the target reverberant sound spectrum 14.15 will match the reverberant spectrum 13; if the target is a moving object, and the relative speed V increases, the target reverberant sound will increase. Spectra 14 and 15 become separated from each other.
したがって、その周波数差は、2・Δfとなり、これを
ヘッドホン5により、それぞれ、片方の耳で(fo+Δ
f)−flを、他方の耳でf2(fo+Δf)を聴き分
けることになるのでドツプラー周波数偏移量Δfを立体
的な音感として明確に判別(識別)することができるよ
うになる。Therefore, the frequency difference is 2·Δf, which is transmitted through the headphones 5 to each ear (fo+Δf).
f)-fl and f2(fo+Δf) with the other ear, it becomes possible to clearly distinguish (identify) the Doppler frequency deviation amount Δf as a three-dimensional pitch.
このように、従来、目標が移動物体であるか否かの判別
(識別)は、残響スペクトル13と目標反響音スペクト
ルL4との、少ない周波数差Δfを聴き分けて行ってい
たのに対し、目標反響音スペクトラム14.15の周波
数差2・Δfを聴き分ければよいので、従来に比べて2
倍の判別効果を発揮することができる。In this way, conventionally, discrimination (identification) as to whether a target is a moving object was carried out by listening to the small frequency difference Δf between the reverberation spectrum 13 and the target echo spectrum L4. Since all you have to do is listen to the frequency difference 2・Δf in the reverberant sound spectrum 14.15, the difference in frequency is 2.
The discrimination effect can be doubled.
更に、残響レベルが極めて低いときは、残響の周波数と
の差を判別することができず、絶対音感に頼って目標の
ドツプラー判別を行わざるを得なかったものが、両耳で
感する目標反響音の周波数差のみを比較すればよいので
、従来に比べて格段にドツプラー判別性能を向上するこ
とができる。Furthermore, when the reverberation level is extremely low, it is impossible to distinguish between the reverberant frequency and the target Doppler discrimination has to be made by relying on absolute pitch. Since it is only necessary to compare the frequency difference between sounds, Doppler discrimination performance can be significantly improved compared to the conventional method.
以上、詳細に説明したように、本発明によれば、比較的
に低い周波数の発射音波でも探知目標からの反響音中の
ドツプラー信号を容易・確実に判別することができるの
で、この種のソーナーの性能向上に顕著な効果が得られ
る。As described in detail above, according to the present invention, it is possible to easily and reliably distinguish Doppler signals in the echo sound from the detection target even with emitted sound waves of relatively low frequency. A remarkable effect can be obtained in improving the performance of
第1図は、従来のアクテイプンーナーの聴音方式による
聴音装置の一例のブロック図、第2図は、その周波数ス
ペクトル図、第3図は、本発明に係るアクテイブソーナ
−の聴音方式にょる聴音部の一実施例のブロック図、第
4図は、その周波数スペクトル図である。
A、B・・・聴音装置、IA、IB・・・変調器、2A
。
2B・・・局部発振器、3A、3B・・・F波器、4A
。
茅 1 目FIG. 1 is a block diagram of an example of a listening device using a conventional active sonar listening method, FIG. 2 is a frequency spectrum diagram thereof, and FIG. 3 is a block diagram of an example of a listening device using an active sonar listening method according to the present invention. FIG. 4, a block diagram of an embodiment of the sound listening section, is a frequency spectrum diagram thereof. A, B... Listening device, IA, IB... Modulator, 2A
. 2B...Local oscillator, 3A, 3B...F wave generator, 4A
. Kaya 1st eye
Claims (1)
受信を行い、その聴音信号の聴取によって探知目標の識
別を行うアクテイプソーナ−の聴音方式において、探知
目標からの反響音のヘテロダイン受信を行い、これを所
望の可聴音として変換・出力する2組の聴音装置を設け
、それらの各局部発振周波数を、それぞれ、ンーナー発
信周波数に対して上下に等しい周波数差をもつものとし
、上記谷聴音装置からの聴音信号を個別に聴取しうるよ
うにすることを特徴とするアクティブソーナーの聴音方
式。1. In the acoustic sonar method of acteip sonar, which emits a sound wave for detection, performs heterodyne reception of the echo sound, and identifies the detection target by listening to the acoustic signal, performs heterodyne reception of the echo sound from the detection target, Two sets of listening devices are installed to convert and output this as a desired audible sound, and their respective local oscillation frequencies have equal frequency differences above and below with respect to the lower oscillation frequency. An active sonar listening method characterized by allowing individual listening signals to be heard.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP347882A JPS58122483A (en) | 1982-01-14 | 1982-01-14 | Sound listening system of active sonar |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP347882A JPS58122483A (en) | 1982-01-14 | 1982-01-14 | Sound listening system of active sonar |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS58122483A true JPS58122483A (en) | 1983-07-21 |
Family
ID=11558439
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP347882A Pending JPS58122483A (en) | 1982-01-14 | 1982-01-14 | Sound listening system of active sonar |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS58122483A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62102184U (en) * | 1985-12-18 | 1987-06-29 |
-
1982
- 1982-01-14 JP JP347882A patent/JPS58122483A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62102184U (en) * | 1985-12-18 | 1987-06-29 |
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