JPH0593772A - Detecting device for underwater acoustic signal - Google Patents
Detecting device for underwater acoustic signalInfo
- Publication number
- JPH0593772A JPH0593772A JP27844591A JP27844591A JPH0593772A JP H0593772 A JPH0593772 A JP H0593772A JP 27844591 A JP27844591 A JP 27844591A JP 27844591 A JP27844591 A JP 27844591A JP H0593772 A JPH0593772 A JP H0593772A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- frequency component
- azimuth
- underwater acoustic
- acoustic signal
- 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
Landscapes
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、水中音響信号検出装置
に係り、特に水中音響の方位及び周波数成分のレベルを
利用した水中音響信号検出装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater acoustic signal detecting apparatus, and more particularly to an underwater acoustic signal detecting apparatus utilizing the direction of underwater acoustics and the level of frequency components.
【０００２】[0002]
【従来の技術】従来の水中音響信号検出方式は、水中音
の周波数成分毎の方位及びレベル情報のうち、レベル情
報のみを使用して信号検出を行っていた。すなわち、雑
音成分より突出したレベルを有する信号を検出するため
に次を行っていた。まず、水中音の周波数成分の平均値
Ｍｐを式１により計算する。なお、Ｎセル個の周波数成
分があり周波数成分は昇順にならんでいるものとする。2. Description of the Related Art In a conventional underwater acoustic signal detection system, signal detection is performed by using only level information of direction and level information for each frequency component of underwater sound. That is, the following is performed in order to detect a signal having a level higher than the noise component. First, the average value Mp of the frequency components of the underwater sound is calculated by Equation 1. It is assumed that there are N cell frequency components and the frequency components are arranged in ascending order.
【０００３】[0003]
【数１】 [Equation 1]
【０００４】ここで、α＝Ｐ−（Ｗ／２）−１；β＝Ｐ
＋（Ｗ／２）＋１；Ｘｉはｉ番目のセルのレベル（ｉ＝
１〜Ｎ）；Ｍｐはｐ番目のセルに対する雑音平均値（ｐ
＝１〜Ｎ）；Ｗは雑音平均値計算に用いるセルの数を示
す。なお、「ｐ＜＝Ｗ／２」又は「ｐ＞＝Ｎ−Ｗ／２」
の場合は、それぞれｐ＝Ｗ／２＋２、ｐ＝Ｎ−Ｗ／２−
２の雑音平均値を用いる。また、雑音平均を計算するセ
ルを中心に合計３セルは計算の対象からはずしている。Where α = P- (W / 2) -1; β = P
+ (W / 2) +1; Xi is the level of the i-th cell (i =
1 to N); Mp is the noise average value (p
= 1 to N); W indicates the number of cells used for noise average value calculation. In addition, "p <= W / 2" or "p> = N-W / 2"
, P = W / 2 + 2 and p = N−W / 2−, respectively.
A noise average value of 2 is used. In addition, a total of 3 cells centering on the cell for which the noise average is calculated are excluded from the calculation target.
【０００５】次に、雑音平均値をもとにスレッショルド
Ｔｉを式２より求める。Next, the threshold value Ti is calculated from the equation 2 based on the noise average value.
【０００６】 Ｔｉ＝Ｋ・Ｍｉ；（但し、Ｋ：定数） ・・・式２Ti = K · Mi; (where K: constant) Equation 2
【０００７】そして、スレッショルドと周波数成分を比
較して、スレッショルドを超えるものを信号として検出
していた（式３参照）。Then, the threshold and the frequency component are compared with each other, and the signal exceeding the threshold is detected as a signal (see the equation 3).
【０００８】 「信号：Ｘｉ＞＝Ｔｉ」「非信号：Ｘｉ＜ Ｔｉ」 ・・・式３“Signal: Xi> = Ti” “Non-signal: Xi <Ti” Equation 3
【０００９】[0009]
【発明が解決しようとする課題】従来の方式では、近傍
の周波数成分のレベルを使用してスレッショルドをかけ
ているため、検出に際して他の周波数成分の影響を受け
てしまうという欠点があった。例えば、信号そのものが
式１のＷほどの周波数の広がりをもっているような場合
は、相対的にスレッショルドが高くなるため、信号検出
しにくい等の不都合がある。In the conventional method, since the threshold is applied by using the levels of the frequency components in the vicinity, there is a drawback in that the detection is affected by other frequency components. For example, when the signal itself has a frequency spread of about W in Expression 1, the threshold becomes relatively high, which makes it difficult to detect the signal.
【００１０】[0010]
【発明の目的】本発明は、かかる従来例の有する不都合
を改善し、とくに、他の信号の周波数成分による悪影響
を有効に抑えることを可能とした水中音響信号検出装置
を提供することを、その目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to provide an underwater acoustic signal detecting apparatus capable of improving the disadvantages of the conventional example and, particularly, effectively suppressing the adverse effect due to the frequency components of other signals. To aim.
【００１１】[0011]
【課題を解決するための手段】本発明では、一定時間毎
に得られる周波数成分別の方位情報を記憶する記憶手段
と、過去の一定期間の方位情報から周波数成分別の方位
の分散値を計算する方位分散値演算手段と、この方位分
散値演算手段で演算される方位分散値を基準として信号
の有無を決定する信号判定手段とを備える、という構成
を採っている。これによって前述した目的を達成しよう
とするものである。According to the present invention, storage means for storing direction information for each frequency component obtained at fixed time intervals, and a dispersion value of the direction for each frequency component are calculated from the direction information for a fixed period in the past. The azimuth dispersion value calculating means and the signal determining means for determining the presence or absence of a signal based on the azimuth dispersion value calculated by the azimuth dispersion value calculating means are provided. This aims to achieve the above-mentioned object.
【００１２】[0012]
【発明の実施例】以下、本発明の一実施例を図１に基づ
いて説明する。この図１に示す実施例は、一定時間毎に
得られる周波数成分別の方位情報を記憶する記憶手段１
と、過去の一定期間の方位情報から周波数成分別の方位
の分散値を計算する方位分散値演算手段としての分散計
算回路２と、この分散計算回路２で演算される方位分散
値を基準として信号の有無を決定する信号判定手段とし
ての判定回路３とを備えている。そして、この判定回路
３が、水中音響信号の到来方位の安定した周波数成分を
検出する機能を備えている。そして、入力端子１００か
らは周波数成分毎の包囲θｉ（ｉ＝f0，f1，…，fn…，
fm）が入力される。これらは、記憶回路１に記憶される
とともに分散計算回路２に入力される。分散計算回路２
では式４により周波数成分毎の方位の分散が計算され
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. The embodiment shown in FIG. 1 is a storage means 1 for storing direction information for each frequency component obtained at regular time intervals.
And a dispersion calculation circuit 2 as an azimuth dispersion value calculation means for calculating the dispersion value of the azimuths for each frequency component from the azimuth information in the past fixed period, and a signal based on the azimuth dispersion value calculated by the dispersion calculation circuit 2. And a determination circuit 3 as a signal determination means for determining the presence or absence of The determination circuit 3 has a function of detecting a stable frequency component of the arrival direction of the underwater acoustic signal. Then, from the input terminal 100, the envelope θi for each frequency component (i = f0, f1, ..., Fn ...,
fm) is input. These are stored in the storage circuit 1 and input to the distributed calculation circuit 2. Distributed calculation circuit 2
Then, the dispersion of the azimuth for each frequency component is calculated by Expression 4.
【００１３】[0013]
【数２】 [Equation 2]
【００１４】ただし、時刻ｔにおける周波数成分fnに対
する方位をθfnt 、時間区間tO〜tTにおける周波数成分
fnの平均方位をθfnとする。However, the direction with respect to the frequency component fn at the time t is θfnt, and the frequency component in the time section tO to tT.
Let θfn be the average direction of fn.
【００１５】式４で計算された値は判定回路３におくら
れ、測定条件により任意に変更可能な定数Ｋと式５によ
り比較することにより信号かどうかの判定を受ける。The value calculated by the equation (4) is sent to the decision circuit (3), and it is decided whether it is a signal or not by comparing it with the constant (K) which can be arbitrarily changed according to the measurement condition by the equation (5).
【００１６】 「信号：δfn ＜ Ｋ」「非信号：δfn ＞ Ｋ」 ・・・式５“Signal: δfn <K” “Non-signal: δfn> K” ・ ・ ・ Equation 5
【００１７】先の分散を計算する時間区間において信号
源が位置を急変しないかぎり信号の方位の分散は小さく
なる。一方、雑音成分は到来方位は特定の方位に限定さ
れないので、方位の分散は大きくなる。従って定数Ｋを
適切に選択することにより信号を検出することが可能で
ある。出力端子２００からは信号と判定された周波数成
分の周波数セル番号が出力される。The dispersion of the azimuth of the signal becomes small unless the signal source suddenly changes the position in the time interval for calculating the dispersion. On the other hand, since the arrival direction of the noise component is not limited to a specific direction, the direction dispersion is large. Therefore, it is possible to detect the signal by appropriately selecting the constant K. The frequency cell number of the frequency component determined to be a signal is output from the output terminal 200.
【００１８】[0018]
【発明の効果】以上説明したように、本発明による、周
波数成分毎の方位情報を利用しているため、他の周波数
成分の影響を受けずに信号検出できるという従来にない
優れた水中音響信号検出装置を提供することができる。As described above, since the azimuth information for each frequency component according to the present invention is utilized, an unprecedented excellent underwater acoustic signal that can be detected without being affected by other frequency components. A detection device can be provided.
【図１】本発明の一実施例のブロック図である。FIG. 1 is a block diagram of an embodiment of the present invention.
１ 記憶回路 ２ 分散値演算手段としての分散計算回路 ３ 信号判定手段としての判定回路 １００ 入力端子 ２００ 出力端子 DESCRIPTION OF SYMBOLS 1 Storage circuit 2 Dispersion calculation circuit as dispersion value calculation means 3 Judgment circuit as signal judgment means 100 Input terminal 200 Output terminal
Claims (2)
位情報を記憶する記憶手段と、過去の一定期間の方位情
報から周波数成分別の方位の分散値を計算する方位分散
値演算手段と、この方位分散値演算手段で演算される方
位分散値を基準として信号の有無を決定する信号判定手
段とを備えていることを特徴とした水中音響信号検出装
置。1. Storage means for storing direction information for each frequency component obtained at fixed time intervals, and direction dispersion value calculation means for calculating a dispersion value of direction directions for each frequency component from direction information of a past fixed period. An underwater acoustic signal detecting apparatus comprising: a signal determining unit that determines the presence or absence of a signal based on the azimuth dispersion value calculated by the azimuth dispersion value calculating unit.
来方位の安定した周波数成分を検出する機能を備えてい
ることを特徴とした請求項１記載の水中音響信号検出装
置。2. The underwater acoustic signal detecting apparatus according to claim 1, wherein the signal determining means has a function of detecting a stable frequency component of the arrival direction of the underwater acoustic signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27844591A JPH0593772A (en) | 1991-09-30 | 1991-09-30 | Detecting device for underwater acoustic signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27844591A JPH0593772A (en) | 1991-09-30 | 1991-09-30 | Detecting device for underwater acoustic signal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0593772A true JPH0593772A (en) | 1993-04-16 |
Family
ID=17597441
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27844591A Pending JPH0593772A (en) | 1991-09-30 | 1991-09-30 | Detecting device for underwater acoustic signal |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0593772A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08184660A (en) * | 1994-12-28 | 1996-07-16 | Nec Corp | Orientation detector |
| JPH0943333A (en) * | 1995-07-26 | 1997-02-14 | Nec Corp | Signal display device |
| JPH09304500A (en) * | 1996-05-13 | 1997-11-28 | Tech Res & Dev Inst Of Japan Def Agency | Signal detection system |
| JP2015087132A (en) * | 2013-10-28 | 2015-05-07 | 株式会社東芝 | Signal detection device and signal detection method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0288984A (en) * | 1988-09-27 | 1990-03-29 | Nec Corp | Active sonar device |
-
1991
- 1991-09-30 JP JP27844591A patent/JPH0593772A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0288984A (en) * | 1988-09-27 | 1990-03-29 | Nec Corp | Active sonar device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08184660A (en) * | 1994-12-28 | 1996-07-16 | Nec Corp | Orientation detector |
| JPH0943333A (en) * | 1995-07-26 | 1997-02-14 | Nec Corp | Signal display device |
| JPH09304500A (en) * | 1996-05-13 | 1997-11-28 | Tech Res & Dev Inst Of Japan Def Agency | Signal detection system |
| JP2015087132A (en) * | 2013-10-28 | 2015-05-07 | 株式会社東芝 | Signal detection device and signal detection method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19980331 |