JP2944429B2 - Signal processing method - Google Patents
Signal processing methodInfo
- Publication number
- JP2944429B2 JP2944429B2 JP6212476A JP21247694A JP2944429B2 JP 2944429 B2 JP2944429 B2 JP 2944429B2 JP 6212476 A JP6212476 A JP 6212476A JP 21247694 A JP21247694 A JP 21247694A JP 2944429 B2 JP2944429 B2 JP 2944429B2
- Authority
- JP
- Japan
- Prior art keywords
- processing unit
- signal
- band
- model approximation
- signal processing
- 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 - Lifetime
Links
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- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は信号処理方式に関し、特
にパッシブソーナーにより受信された目標信号をモデル
近似理論を用いて周波数分析する信号処理方式に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal processing system, and more particularly to a signal processing system for analyzing a frequency of a target signal received by a passive sonar by using a model approximation theory.
【０００２】[0002]
【従来の技術】モデル近似理論とは、観測された有限時
間の事象に特定のモデルを当てはめることで過去或いは
未来の事象を推定或いは予測する理論である。これを観
測データの周波数分析に応用すると、モデルと観測事象
との差異が小さい程、正確な解析が行えるという特徴を
有する。パッシブソーナーにより受信された目標信号を
モデル近似理論を用いて周波数分析する従来の信号処理
方式は、図４に示すように、全帯域を対象としたモデル
近似処理部３のみから構成されている。2. Description of the Related Art The model approximation theory is a theory for estimating or predicting a past or future event by applying a specific model to an observed finite time event. If this is applied to the frequency analysis of observation data, the characteristic is that the smaller the difference between the model and the observation event, the more accurate the analysis. A conventional signal processing method for frequency-analyzing a target signal received by a passive sonar by using a model approximation theory includes, as shown in FIG. 4, only a model approximation processing unit 3 for the entire band.
【０００３】[0003]
【発明が解決しようとする課題】この従来の信号処理方
式では、全帯域を対象としたモデル近似処理部３で、有
限個の観測データを用いて観測時間外のデータを推定し
ているため、入力信号のＳ／Ｎ（信号対雑音）比が悪く
なると雑音に影響され、モデル近似の精度が悪化し、信
号が検出できなくなるという欠点があった。In this conventional signal processing method, since the model approximation processing unit 3 for all bands estimates data outside the observation time using a finite number of observation data, When the S / N (signal-to-noise) ratio of the input signal is deteriorated, it is affected by noise, and the accuracy of model approximation is deteriorated, so that the signal cannot be detected.
【０００４】本発明の課題は、入力信号のＳ／Ｎ比が悪
くなっても目標信号の検出が可能な信号処理方式を提供
することにある。An object of the present invention is to provide a signal processing method capable of detecting a target signal even when the S / N ratio of an input signal is deteriorated.
【０００５】[0005]
【課題を解決するための手段】本発明によれば、パッシ
ブソーナーで受信した受信信号を受け、所定の周波数帯
域のみ通過させるバンドパス処理部と、このバンドパス
処理部の出力結果を受け、有限個の観測データを用いて
観測時間以外のデータを推定するモデル近似理論で周波
数分析するモデル近似処理部とを有する信号処理部を複
数個と、前記複数個の信号処理部の前記モデル近似処理
部の出力結果を合成する結果合成処理部とを備え、これ
ら複数個の信号処理部の前記バンドパス処理部は、実質
的に異なる所定の周波数帯域のみ通過させて前記複数個
の信号処理部の前記モデル近似処理部に送出すること
で、前記受信信号周波数を通過させるバンドパス処理部
以外の周波数成分の雑音による影響を前記受信信号のモ
デル近似処理から除くことを特徴とする信号処理方式が
得られる。According to the present invention, a band-pass processing section for receiving a signal received by a passive sonar and passing only a predetermined frequency band, and receiving an output result of the band-pass processing section, A plurality of signal processing units having a model approximation processing unit for performing frequency analysis using a model approximation theory for estimating data other than the observation time using the observation data, and the model approximation processing unit of the plurality of signal processing units And a result synthesis processing unit for synthesizing the output results of the plurality of signal processing units, wherein the band-pass processing units of the plurality of signal processing units pass only substantially different predetermined frequency bands, and By transmitting the signal to the model approximation processing unit, the influence of noise of frequency components other than the bandpass processing unit that passes the reception signal frequency is removed from the model approximation processing of the reception signal. Signal processing method is obtained, characterized in that.
【０００６】更に本発明によれば、パッシブソーナーで
受信した受信信号を受け、第１の所定の周波数帯域のみ
通過させる第１のバンドパス処理部と、この第１のバン
ドパス処理部の出力結果を受け、有限個の観測データを
用いて観測時間以外のデータを推定するモデル近似理論
で周波数分析する第１のモデル近似処理部とを、有する
第１の信号処理部と、前記受信信号を受け、前記第１の
所定の周波数帯域とは実質的に異なる第２の所定の周波
数帯域のみ通過させる第２のバンドパス処理部と、この
第２のバンドパス処理部の出力結果を受け、有限個の観
測データを用いて観測時間以外のデータを推定するモデ
ル近似理論で周波数分析する第２のモデル近似処理部と
を、有する第２の信号処理部と、前記第１及び前記第２
のモデル近似処理部の出力結果を合成する結果合成処理
部とを備え、前記受信信号周波数を通過させるバンドパ
ス処理部以外の周波数成分の雑音による影響を前記受信
信号のモデル近似処理から除くことを特徴とする信号処
理方式が得られる。Further, according to the present invention, a first band-pass processing unit for receiving a reception signal received by a passive sonar and passing only a first predetermined frequency band, and an output result of the first band-pass processing unit Receiving a received signal, a first signal processing unit having a first model approximation processing unit for performing frequency analysis using a model approximation theory for estimating data other than the observation time using a finite number of observation data; A second band-pass processing unit that passes only a second predetermined frequency band substantially different from the first predetermined frequency band; A second signal processing unit having a second model approximation processing unit for performing frequency analysis by a model approximation theory for estimating data other than the observation time using the observation data of the first and the second,
And a result synthesis processing unit that synthesizes the output result of the model approximation processing unit, and excludes the influence of noise of frequency components other than the band-pass processing unit that passes the reception signal frequency from the model approximation processing of the reception signal. The characteristic signal processing method is obtained.
【０００７】[0007]
【０００８】[0008]
【実施例】次に本発明の実施例について図面を参照して
説明する。Next, an embodiment of the present invention will be described with reference to the drawings.
【０００９】図１を参照すると、本発明による信号処理
方式に用いる信号処理部１は、パッシブソーナーで受信
した信号に応答して、所定の周波数帯域のみ通過させる
バンドパス処理部２と、このバンドパス処理部２の出力
結果をモデル近似理論で周波数分析するモデル近似処理
部３とを、有する。このように、モデル近似する対象周
波数帯域以外をバンドパス処理で除去し、モデル近似を
行う為、雑音の影響による近似誤差を小さくする。Referring to FIG. 1, a signal processing unit 1 used in a signal processing system according to the present invention includes a band-pass processing unit 2 that passes only a predetermined frequency band in response to a signal received by a passive sonar, A model approximation processing unit 3 for frequency-analyzing the output result of the path processing unit 2 by the model approximation theory. In this way, since the frequency band other than the target frequency band to be approximated by the model is removed by band-pass processing and the model is approximated, the approximation error due to the influence of noise is reduced.
【００１０】図２を参照すると、本発明の第１の実施例
による信号処理方式は、Ｎ個（Ｎは２以上の整数）の信
号処理部１−１〜１−Ｎを備えている。これら信号処理
部１−１〜１−Ｎの各々は、図１の信号処理部１と同じ
構造を有する。これら複数個の信号処理部１−１〜１−
Ｎのバンドパス処理部２（図１）は、前記信号に応答し
て、実質的に異なる所定の周波数帯域のみ通過させ、複
数個の信号処理部１−１〜１−Ｎのモデル近似処理部３
（図１）に送出する。本実施例による信号処理方式は、
複数個の信号処理部１−１〜１−Ｎのモデル近似処理部
３の出力結果を合成する結果合成処理部４をも備えてい
る。Referring to FIG. 2, the signal processing system according to the first embodiment of the present invention includes N (N is an integer of 2 or more) signal processing units 1-1 to 1-N. Each of these signal processing units 1-1 to 1-N has the same structure as signal processing unit 1 in FIG. These plurality of signal processing units 1-1 to 1--1
In response to the signal, N band-pass processing units 2 (FIG. 1) pass only substantially different predetermined frequency bands, and model approximation processing units of a plurality of signal processing units 1-1 to 1-N. 3
(FIG. 1). The signal processing method according to the present embodiment
It also includes a result synthesis processing unit 4 that synthesizes output results of the model approximation processing units 3 of the plurality of signal processing units 1-1 to 1-N.
【００１１】図３は図２においてＮが３の場合の具体例
を示している。図３の信号処理方式は、高周波数成分を
通過させるバンドパス処理部２１と、中周波数成分を通
過させるバンドパス処理部２２と、低周波数成分を通過
させるバンドパス処理部２３と、バンドパス処理部２１
〜２３のそれぞれの出力結果を周波数分析するモデル近
似処理部３１〜３３と、モデル近似処理部３１〜３３の
出力結果を合成する結果合成処理部４とを有する。FIG. 3 shows a concrete example when N is 3 in FIG. The signal processing method of FIG. 3 includes a band-pass processing unit 21 that passes a high-frequency component, a band-pass processing unit 22 that passes a middle-frequency component, a band-pass processing unit 23 that passes a low-frequency component, and a band-pass process. Part 21
23, a model approximation processing unit 31 to 33 for analyzing the frequency of each output result, and a result synthesis processing unit 4 for synthesizing the output results of the model approximation processing units 31 to 33.
【００１２】次に、図３の動作について具体的に説明す
る。例えば目標が発する７０Ｈｚの信号に０〜９０Ｈｚ
の白色雑音が加わった信号Ｓがバンドパス処理部２１〜
２３に入力されたとする。バンドパス処理部２１は６０
〜９０Ｈｚの高周波成分を通過させ、バンドパス処理部
２２は３０〜６０Ｈｚの中間周波成分を通過させ、バン
ドパス処理部２３は０〜３０Ｈｚの低周波成分を通過さ
せる。バンドパス処理部２１は６０〜９０Ｈｚの高周波
成分を通過させるので、信号ＳH は、０〜６０Ｈｚの雑
音成分が除去されているため、信号と雑音のエネルギー
比が改善された信号となる。バンドパス処理部２１〜２
３から出力された信号ＳH 〜ＳL はモデル近似処理部３
１〜３３へ入力されて周波数分析される。それぞれの出
力結果ＦH 〜ＦL は結果合成処理部４へ入力され、０〜
９０Ｈｚの帯域の周波数分析処理結果Ｆとして出力され
る。Next, the operation of FIG. 3 will be specifically described. For example, 0-90Hz for 70Hz signal emitted by the target
The signal S to which the white noise is added is output from the band-pass processing units 21 to 21.
23 is assumed to be input. The band-pass processing unit 21
The band-pass processing unit 22 passes an intermediate frequency component of 30 to 60 Hz, and the band-pass processing unit 23 passes a low-frequency component of 0 to 30 Hz. Since the band-pass processing unit 21 passes a high-frequency component of 60 to 90 Hz, the signal S H is a signal in which the noise ratio of signal to noise is improved because the noise component of 0 to 60 Hz has been removed. Band pass processing units 21 and 2
The signals S H to S L output from the model approximation processing unit 3
The signals are input to 1 to 33 and subjected to frequency analysis. The respective output results F H to F L are input to the result synthesis processing unit 4,
It is output as a frequency analysis processing result F of a band of 90 Hz.
【００１３】このようにモデル近似する対象周波数帯域
以外をバンドパス処理で除去し、モデル近似を行う為、
雑音の影響による近似誤差を小さくする。In order to remove the frequency band other than the target frequency band for model approximation by band-pass processing and perform model approximation,
Reduce the approximation error due to the influence of noise.
【００１４】[0014]
【発明の効果】以上説明したように、本発明による信号
処理方式は、入力信号を周波数帯域制限してからモデル
近似するよう構成したため、低Ｓ／Ｎ比での信号検出が
可能になるという効果を有する。As described above, since the signal processing method according to the present invention is configured to approximate the model after limiting the frequency band of the input signal, the signal can be detected at a low S / N ratio. Having.
【図１】本発明による信号処理方式に用いる信号処理部
のブロック図である。FIG. 1 is a block diagram of a signal processing unit used for a signal processing method according to the present invention.
【図２】本発明の第１の実施例による信号処理方式のブ
ロック図である。FIG. 2 is a block diagram of a signal processing method according to a first embodiment of the present invention.
【図３】図２の実施例において信号処理部の個数Ｎが３
の場合の具体例のブロック図である。FIG. 3 shows a case where the number N of signal processing units is 3 in the embodiment of FIG.
It is a block diagram of the specific example in the case of.
【図４】従来の信号処理方式のブロック図である。FIG. 4 is a block diagram of a conventional signal processing method.
１ 信号処理部 ２ バンドパス処理部 ３ モデル近似処理部 ４ 結果合成処理部 ２１ バンドパス処理部 ２２ バンドパス処理部 ２３ バンドパス処理部 ３１ モデル近似処理部 ３２ モデル近似処理部 ３３ モデル近似処理部 REFERENCE SIGNS LIST 1 signal processing unit 2 bandpass processing unit 3 model approximation processing unit 4 result synthesis processing unit 21 bandpass processing unit 22 bandpass processing unit 23 bandpass processing unit 31 model approximation processing unit 32 model approximation processing unit 33 model approximation processing unit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 杉山 博之 東京都目黒区目黒５−28−17 小山荘 201号 (72)発明者 山▲崎▼ 有彦 東京都港区芝五丁目７番１号 日本電気 株式会社内 (56)参考文献 特開 昭62−71869（ＪＰ，Ａ) 実開 昭62−44269（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) G01R 23/16 G01S 15/00 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroyuki Sugiyama 5-28-17 Koyamaso, Meguro, Meguro-ku, Tokyo 201 (72) Inventor Yama ▲ saki ▼ Arihiko 5-7-1 Shiba, Minato-ku, Tokyo NEC Corporation (56) References JP-A-62-71869 (JP, A) JP-A-62-44269 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) G01R 23 / 16 G01S 15/00
Claims (2)
受け、所定の周波数帯域のみ通過させるバンドパス処理
部と、このバンドパス処理部の出力結果を受け、有限個
の観測データを用いて観測時間以外のデータを推定する
モデル近似理論で周波数分析するモデル近似処理部とを
有する信号処理部を複数個と、 前記複数個の信号処理部の前記モデル近似処理部の出力
結果を合成する結果合成処理部とを備え、 これら複数個の信号処理部の前記バンドパス処理部は、
実質的に異なる所定の周波数帯域のみ通過させて前記複
数個の信号処理部の前記モデル近似処理部に送出するこ
とで、前記受信信号周波数を通過させるバンドパス処理
部以外の周波数成分の雑音による影響を前記受信信号の
モデル近似処理から除くことを特徴とする信号処理方
式。1. A bandpass processing unit that receives a reception signal received by a passive sonar and passes only a predetermined frequency band, receives an output result of the bandpass processing unit, and uses a finite number of observation data to calculate a time other than an observation time. A plurality of signal processing units having a model approximation processing unit for performing frequency analysis by a model approximation theory for estimating the data of the plurality of signal processing units; The band pass processing unit of the plurality of signal processing units includes:
By passing only substantially different predetermined frequency bands and sending them to the model approximation processing units of the plurality of signal processing units, the influence of noise of frequency components other than the band-pass processing units that pass the reception signal frequency From the model approximation of the received signal.
受け、第１の所定の周波数帯域のみ通過させる第１のバ
ンドパス処理部と、この第１のバンドパス処理部の出力
結果を受け、有限個の観測データを用いて観測時間以外
のデータを推定するモデル近似理論で周波数分析する第
１のモデル近似処理部とを、有する第１の信号処理部
と、 前記受信信号を受け、前記第１の所定の周波数帯域とは
実質的に異なる第２の所定の周波数帯域のみ通過させる
第２のバンドパス処理部と、この第２のバンドパス処理
部の出力結果を受け、有限個の観測データを用いて観測
時間以外のデータを推定するモデル近似理論で周波数分
析する第２のモデル近似処理部とを、有する第２の信号
処理部と、 前記第１及び前記第２のモデル近似処理部の出力結果を
合成する結果合成処理部とを備え、 前記受信信号周波数を通過させるバンドパス処理部以外
の周波数成分の雑音による影響を前記受信信号のモデル
近似処理から除くことを特徴とする信号処理方式。2. A first band-pass processing unit that receives a reception signal received by a passive sonar and passes only a first predetermined frequency band, and receives an output result of the first band-pass processing unit, and A first signal processing unit having a first model approximation processing unit that performs frequency analysis by a model approximation theory that estimates data other than the observation time using the observation data of the first signal processing unit; A second bandpass processing unit that passes only a second predetermined frequency band that is substantially different from the predetermined frequency band, and receives an output result of the second bandpass processing unit and uses a finite number of observation data. A second signal processing unit having a second model approximation processing unit for performing frequency analysis using a model approximation theory for estimating data other than the observation time, and output results of the first and second model approximation processing units Synthesize That a result synthesis processing unit, signal processing method, characterized in that to eliminate the influence by the noise of the frequency components other than the band pass processing unit for passing the reception signal frequency from the model approximation of the received signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6212476A JP2944429B2 (en) | 1994-06-13 | 1994-09-06 | Signal processing method |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6-130434 | 1994-06-13 | ||
| JP13043494 | 1994-06-13 | ||
| JP6212476A JP2944429B2 (en) | 1994-06-13 | 1994-09-06 | Signal processing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0862263A JPH0862263A (en) | 1996-03-08 |
| JP2944429B2 true JP2944429B2 (en) | 1999-09-06 |
Family
ID=26465569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6212476A Expired - Lifetime JP2944429B2 (en) | 1994-06-13 | 1994-09-06 | Signal processing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2944429B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6244269U (en) * | 1985-09-04 | 1987-03-17 | ||
| JPS6271869A (en) * | 1985-09-25 | 1987-04-02 | Mitsubishi Electric Corp | Frequency detecting device |
-
1994
- 1994-09-06 JP JP6212476A patent/JP2944429B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0862263A (en) | 1996-03-08 |
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