JPS5844227B2 - Subpole suppression method for directional beams in underwater detection equipment - Google Patents
Subpole suppression method for directional beams in underwater detection equipmentInfo
- Publication number
- JPS5844227B2 JPS5844227B2 JP52121234A JP12123477A JPS5844227B2 JP S5844227 B2 JPS5844227 B2 JP S5844227B2 JP 52121234 A JP52121234 A JP 52121234A JP 12123477 A JP12123477 A JP 12123477A JP S5844227 B2 JPS5844227 B2 JP S5844227B2
- Authority
- JP
- Japan
- Prior art keywords
- directional beam
- directional
- sub
- pole
- underwater detection
- 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.)
- Expired
Links
Landscapes
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Description
【発明の詳細な説明】
広範囲の水中探知を行なう場合、指向方向が少しずつ順
に異なる多数の指向性ビームをあらかじめ形成しておき
、各々の指向性ビームを順に切換えるようにすると、比
較的短時間に広範囲の水中探知を行なうことができる。[Detailed Description of the Invention] When performing underwater detection over a wide area, it is possible to form a large number of directional beams with slightly different pointing directions in advance, and to switch each directional beam in turn. A wide range of underwater detection can be carried out.
上記において、指向性ビームは副極が極力小さいことが
必要である。In the above, it is necessary that the directional beam has a subpole as small as possible.
ところが、超音波振動子を円上に装置1ルて、位相合成
によって指向性ビームを形成する場合、合成回路の不均
一性によって比較的大きな副極が生じやすい。However, when ultrasonic transducers are arranged in a circle in a device and a directional beam is formed by phase synthesis, relatively large sub-poles are likely to occur due to non-uniformity of the synthesis circuit.
この発明は、上記のような水中探知装置に用いて、副極
を最小限にして指向性ビームを形成し得る装置を提供す
る。The present invention provides a device that can be used in the above-described underwater detection device to form a directional beam while minimizing the number of subpoles.
以下図面の実施例において説明すると、第1図において
、T1乃至Tnは送受波器構体を示しθ1乃至θnの各
々個有の方向に指向性ビームを形成している。To explain the embodiments in the drawings below, in FIG. 1, T1 to Tn represent transducer structures, which form directional beams in respective directions of θ1 to θn.
送受波器構体T1乃至Tnの各々は、実際には円上に配
列された複数個の超音波振動子を合成して形成されてい
る。Each of the transducer structures T1 to Tn is actually formed by combining a plurality of ultrasonic transducers arranged in a circle.
第1図においてはθi力方向指向性を有する送受波器構
体Tiの指向性ビームの副極を抑圧する場合を示す。FIG. 1 shows the case where the subpole of the directional beam of the transducer assembly Ti having the θi force direction directivity is suppressed.
送受波器構体T1の指向性ビームは合或回路1へ導かれ
る。The directional beam of the transducer assembly T1 is guided to a combiner circuit 1.
合成回路1は、レベル制御器2及び移相器3を介して導
かれる送受波器構体Ti十にの指向性ビームと上記送受
波器構体Tiの指向性ビームとを合成する。A combining circuit 1 combines the directional beam of the transducer assembly Ti which is guided through the level controller 2 and the phase shifter 3 with the directional beam of the transducer assembly Ti.
又、合成回路1は、レベル制御器2′及び移相器3′を
介して導かれる送受波器構体Ti−にの指向性ビームと
送受波器構成Tiの指向性ビームとをも合成する。The combining circuit 1 also combines the directional beam to the transducer structure Ti- guided through the level controller 2' and the phase shifter 3' and the directional beam of the transducer structure Ti.
送受波器構体Tiの指向性ビームはθ、力方向指向性を
有し、その指向特性は第2図Biのように表わされる。The directional beam of the transducer assembly Ti has directivity in the force direction θ, and its directional characteristics are expressed as shown in FIG. 2 Bi.
又、送受波器構体Ti十にの指向性ビームはθi十に方
向に指向性を有し、その指向特性は第2図Bi+にのよ
うに表わされる。Furthermore, the directional beam of the transducer assembly Ti0 has directivity in the direction θi0, and its directional characteristics are expressed as shown in FIG. 2 Bi+.
そして、この指向性ビームBi+には、θi方尚の指向
性ビームBiに生じる第1副極Bi′と指向方向が一致
するようになされている。This directional beam Bi+ is arranged so that its directional direction coincides with the first sub-pole Bi' generated in the directional beam Bi in the θi direction.
この指向方向の一致は、田土に配列される超音波振動子
の配列間隔、合成する個数を適当に設定することにより
可能である。This alignment of the pointing directions can be achieved by appropriately setting the arrangement interval of the ultrasonic transducers arranged on the rice field and the number of ultrasonic transducers to be synthesized.
又、第1副極Bi’に指向方向が一致する指向性ビーム
が無いときは、指向方向が第1副極に近接する複数の指
向性ビームを合成して、合成ビームの指向方向を第1副
極B t/に一致させてもよい。Furthermore, when there is no directional beam whose directional direction coincides with the first sub-pole Bi', a plurality of directional beams whose directional directions are close to the first sub-pole are combined, and the directional direction of the combined beam is set to the first sub-pole. It may be made coincident with the sub-pole B t/.
レベル制御器2は、上記指向性ビームθi+にのビーム
強度を上記第1副極Bi′の強度に一致させるようにレ
ベル制御を行なう。The level controller 2 performs level control so that the beam intensity of the directional beam θi+ matches the intensity of the first sub-pole Bi'.
レベル制御が行なわれた指向性ビームθi+にの周波信
号は、移相器3に導かれる。The level-controlled frequency signal of the directional beam θi+ is guided to the phase shifter 3.
移相器3は、指向性ビームθi十にの周波信号を、指向
性ビーム信号θiの周波信号と同相又は逆相になるよう
に移相させる。The phase shifter 3 shifts the phase of the frequency signal of the directional beam θi so that it is in phase with or in phase with the frequency signal of the directional beam signal θi.
このときの移相量は、振動子の形状、音波周波数、振動
子の合成状態によって決まる。The amount of phase shift at this time is determined by the shape of the vibrator, the sound wave frequency, and the combined state of the vibrator.
合成回路1は、移相器3で移相された指向性ビームθi
+にの周波信号と指向性ビームθlの周波信号とを合成
する。The combining circuit 1 generates a directional beam θi phase-shifted by a phase shifter 3.
The frequency signal of + and the frequency signal of directional beam θl are combined.
すなわち、指向性ビームθi+にの周波信号と指向性ビ
ームθiの周波信号が同相の場合、合成回路1は減算作
用を行ない、又、逆相のときは加算作用を行なう。That is, when the frequency signals of the directional beam θi+ and the frequency signals of the directional beam θi are in phase, the combining circuit 1 performs a subtraction operation, and when they are in opposite phase, it performs an addition operation.
従って、指向性ビーム信号Biは、その副極部が指向性
ビーム信号Bi’+kによって相殺される結果、第3図
のように副極部が抑圧された指向特性が得られる。Therefore, the sub-pole portion of the directional beam signal Bi is canceled out by the directional beam signal Bi'+k, resulting in a directivity characteristic in which the sub-pole portion is suppressed as shown in FIG. 3.
他方、レベル制御器2及び移相器3′は、上記レベル制
御器2及び移相器3と同様に動作して、θi−に方向の
指向性ビームを用いて、上記第1副極Bi′に対称に生
じる指向性ビームBiの副極B i//を抑圧する。On the other hand, the level controller 2 and the phase shifter 3' operate in the same manner as the level controller 2 and the phase shifter 3, and use the directional beam in the direction of θi- to generate the first sub-pole Bi'. suppresses the sub-pole B i// of the directional beam Bi which occurs symmetrically to the directional beam Bi.
以上の結果、合成回路1からは、第3図のように、副極
部が抑圧された指向性ビームが送出されるから、これを
受波ビームとして用いて、切換器4を介して表示器5に
表示させると、不要方向の受波信号を極力抑圧して表示
することができる。As a result of the above, the combining circuit 1 outputs a directional beam with the sub-pole suppressed as shown in FIG. 5, it is possible to suppress received signals in unnecessary directions as much as possible.
切換器4は、合成回路1と同様に、受波器構体T1乃至
Tnの各々に対応して設けられる第1乃至第nの合成回
路の出力を時分割的に切換えて送出する。Similar to the combining circuit 1, the switching device 4 time-divisionally switches and transmits the outputs of the first to nth combining circuits provided corresponding to each of the receiver structures T1 to Tn.
なお、上記において、レベル制御器2は、指向性ビーム
Bi+にの強度を制御する代わりに、指向性ビームBi
の強度を制御するようにしてもよい。Note that in the above, the level controller 2 controls the intensity of the directional beam Bi+ instead of controlling the intensity of the directional beam Bi+.
The intensity may be controlled.
なお、上記実施例においては、指向性ビームBiの第1
副極を抑圧する場合について説明したが、同様にして、
第2副極、第3副極等を抑圧することも可能である。In the above embodiment, the first directional beam Bi
We have explained the case of suppressing the subpole, but in the same way,
It is also possible to suppress the second sub-pole, third sub-pole, etc.
以上説明のようにこの発明は、広範囲の各方向に指向性
ビームを配列して広範囲方向の探知を行なう水中探知装
置において、互いに副極方向に位置する指向性ビームを
組合わせて副極を抑圧するものであるから、指向性ビー
ムを合成する合成回路を付加するだけで、送受波器の構
造をなんら変更することな〈従来の送受波器を用いて行
なうことができる。As explained above, the present invention is an underwater detection device that performs wide range detection by arranging directional beams in each direction over a wide range. Therefore, it is possible to use a conventional transducer without changing the structure of the transducer by simply adding a combining circuit for synthesizing the directional beams.
第1図はこの発明の実施例を示し、第2図及び第3図は
その動作を説明するための指向特性図を示す。FIG. 1 shows an embodiment of the present invention, and FIGS. 2 and 3 show directional characteristics diagrams for explaining its operation.
Claims (1)
ームを順に切換えて水中探知を行なう水中探知装置にお
いて、 上記多数の指向性ビームのうち任意の指向性ビームに生
じる副極と指向性が一致する特定の指向性ビームの強度
が上記任意の指向性ビームの副極強度と平衡するように
強度制御を行なうレベル制御回路と、上記特定の指向性
ビーム信号と上記任意の指向性ビーム信号とが同相もし
くは逆相になるように位相制御を行なう移相器と、該レ
ベル制御及び位相制御の行なわれた上記特定の指向性ビ
ームと上記任意の指向性ビームの副極とを互いに逆相関
係に合成する合成回路とを具備し、該合成回路を上記一
定角度ずつ順に異なる多数の指向性ビームの各々に対応
して設は各合成回路の合成出力を順に切換えて水中探知
信号として用いることを特徴とする水中探知装置におけ
る指向性ビームの副極抑圧装置。 2 上記特定の指向性ビームが、上記任意の指向性ビー
ムに生ずる副極と近接方向に指向性を有する複数の指向
性ビームを合成して形成されていることを特徴とする特
許請求の範囲第1項記載の水中探知装置における指向性
ビームの副極抑圧装置。[Scope of Claims] 1. In an underwater detection device that performs underwater detection by sequentially switching a number of directional beams whose directional directions differ by a fixed angle, a subpole that occurs in any directional beam among the number of directional beams. a level control circuit that performs intensity control so that the intensity of a specific directional beam whose directivity matches that of the above-mentioned arbitrary directional beam is balanced with the sub-pole intensity of the above-mentioned arbitrary directional beam; a phase shifter that performs phase control so that the directional beam signal is in the same phase or in opposite phase; and a sub-pole of the specific directional beam and the arbitrary directional beam that have undergone the level control and phase control. The combination circuit is equipped with a synthesis circuit that synthesizes the signals in an antiphase relationship with each other, and the synthesis circuit is configured to sequentially switch the synthesis output of each synthesis circuit in response to each of the plurality of directional beams that are different in order by a certain angle, thereby generating an underwater detection signal. A sub-pole suppression device for a directional beam in an underwater detection device, characterized in that it is used as a directional beam subpole suppressor. 2. The specific directional beam is formed by combining a plurality of directional beams having directivity in the sub-pole and proximity direction of the arbitrary directional beams. A sub-pole suppression device for a directional beam in the underwater detection device according to item 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52121234A JPS5844227B2 (en) | 1977-10-07 | 1977-10-07 | Subpole suppression method for directional beams in underwater detection equipment |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52121234A JPS5844227B2 (en) | 1977-10-07 | 1977-10-07 | Subpole suppression method for directional beams in underwater detection equipment |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5481869A JPS5481869A (en) | 1979-06-29 |
JPS5844227B2 true JPS5844227B2 (en) | 1983-10-01 |
Family
ID=14806223
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP52121234A Expired JPS5844227B2 (en) | 1977-10-07 | 1977-10-07 | Subpole suppression method for directional beams in underwater detection equipment |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5844227B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6349381Y2 (en) * | 1983-09-12 | 1988-12-19 | ||
JPH038503Y2 (en) * | 1984-08-24 | 1991-03-01 | ||
JPH0554574B2 (en) * | 1984-11-29 | 1993-08-12 | Toyota Motor Co Ltd |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58139088A (en) * | 1982-02-13 | 1983-08-18 | Furuno Electric Co Ltd | Detected information display |
JP4771575B2 (en) * | 2000-06-02 | 2011-09-14 | 古野電気株式会社 | Underwater detector |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3177489A (en) * | 1960-01-11 | 1965-04-06 | Thompson Ramo Wooldridge Inc | Interference suppression systems |
-
1977
- 1977-10-07 JP JP52121234A patent/JPS5844227B2/en not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3177489A (en) * | 1960-01-11 | 1965-04-06 | Thompson Ramo Wooldridge Inc | Interference suppression systems |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6349381Y2 (en) * | 1983-09-12 | 1988-12-19 | ||
JPH038503Y2 (en) * | 1984-08-24 | 1991-03-01 | ||
JPH0554574B2 (en) * | 1984-11-29 | 1993-08-12 | Toyota Motor Co Ltd |
Also Published As
Publication number | Publication date |
---|---|
JPS5481869A (en) | 1979-06-29 |
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