JPH05312942A - Sonar preprocessing apparatus - Google Patents

Sonar preprocessing apparatus

Info

Publication number
JPH05312942A
JPH05312942A JP11330092A JP11330092A JPH05312942A JP H05312942 A JPH05312942 A JP H05312942A JP 11330092 A JP11330092 A JP 11330092A JP 11330092 A JP11330092 A JP 11330092A JP H05312942 A JPH05312942 A JP H05312942A
Authority
JP
Japan
Prior art keywords
signal
frequency
sonar
reception
band
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.)
Withdrawn
Application number
JP11330092A
Other languages
Japanese (ja)
Inventor
Taketoshi Hamahara
武俊 濱原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Aerospace Systems Ltd
Original Assignee
NEC Aerospace Systems Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by NEC Aerospace Systems Ltd filed Critical NEC Aerospace Systems Ltd
Priority to JP11330092A priority Critical patent/JPH05312942A/en
Publication of JPH05312942A publication Critical patent/JPH05312942A/en
Withdrawn legal-status Critical Current

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  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)

Abstract

PURPOSE:To obtain a sonar preprocessing apparatus, which can detect even the opposite signal from a target, whose moving speed is quick, and which can generate a Doppler shift larger than the received bandwidth of an active sonar. CONSTITUTION:A frequency converter part 13A, which outputs the base-band signal, a local-signal generating part 1, which can supply the local signal of an arbitrary frequency that is not related to the frequency of transmitting sonar signal, and receiving-band detector 2, which can detect the signals in the receiving band that is three times the receiving band of the sonar, are provided. With the output contents of the receiving-band detector 2 being monitored, the frequency of the local signal is set at the frequency, which is different from the frequency of the transmitting sonar signal.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、アクティブソーナーに
使用されるソーナー前処理装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sonar pretreatment device used for an active sonar.

【0002】[0002]

【従来の技術】従来のソーナー前処置装置は図2に示す
ように、アクティブソーナーの受信信号を入力して復調
しデジタル信号を出力する復調部10と、復調されたデ
ジタル信号を入力してアナログ信号を出力するD/A変
換部11と、アナログ信号を入力するフィルタ部12
と、フィルタ部12において帯域制限されたアナログ信
号を入力して、ベースバンド信号を出力する周波数変換
部13と、ベースバンド信号を入力してソーナーの受信
帯域より高い周波数成分を除去するローパスフィルタ
(LPF)14と、帯域制限されたベースバンド信号を
デジタルデータに変換して出力するA/D変換部15
と、ソーナー送信信号の周波数と同一周波数のローカル
信号を送信信号として送受波器に送るとともに周波数変
換部13に出力する掃引制御部16とを有している。
2. Description of the Related Art As shown in FIG. 2, a conventional sonar pretreatment device has a demodulation section 10 for receiving and demodulating a received signal of an active sonar and outputting a digital signal, and an analog circuit for receiving a demodulated digital signal. D / A converter 11 that outputs a signal and filter 12 that inputs an analog signal
A frequency conversion unit 13 that inputs a band-limited analog signal in the filter unit 12 and outputs a baseband signal; and a low-pass filter that inputs the baseband signal and removes frequency components higher than the reception band of the sonar ( LPF) 14 and an A / D converter 15 for converting a band-limited baseband signal into digital data and outputting the digital data.
And a sweep control unit 16 that sends a local signal having the same frequency as the frequency of the sonar transmission signal to the transceiver as a transmission signal and outputs it to the frequency conversion unit 13.

【0003】[0003]

【発明が解決しようとする課題】この従来のソーナー前
処理装置では、図2に示す周波数変換部13において、
帯域制限されたアナログ信号と、ソーナー送信信号と同
一周波数のローカル信号を掛けあわせることにより周波
数変換を行っているため、出力されるベースバンド信号
は、帯域制限されたアナログ信号とソーナー送信信号の
周波数との差の周波数成分を持つ信号となり、LPF1
4においてソーナー送信信号の周波数を中心として受信
帯域外のベースバンド信号は除去される。このためソー
ナー送信信号の周波数を中心として受信帯域幅以上のド
ップラーシフトを発生させる移動速度の速い目標信号か
ら反射した場合には、アクティブソーナー受信信号は、
LPF14により除去され、目標として探知できないと
いう欠点があった。この対策として受信帯域を拡げて解
決することができるが、受信帯域を拡げることは、アク
ティブソーナー受信信号のサンプリング周期、信号処理
装置の処理内容の変更が必要となり、ソーナー装置全体
の規模が増大するので、適用が困難であった。
In this conventional sonar pretreatment device, in the frequency converter 13 shown in FIG.
Since the frequency conversion is performed by multiplying the band-limited analog signal and the local signal of the same frequency as the sonar transmission signal, the output baseband signal is the frequency of the band-limited analog signal and the sonar transmission signal. The signal has a frequency component that is the difference between
In 4, the baseband signal outside the reception band centered on the frequency of the sonar transmission signal is removed. Therefore, when reflected from a target signal with a high moving speed that causes a Doppler shift exceeding the reception bandwidth centering on the frequency of the sonar transmission signal, the active sonar reception signal becomes
There was a drawback that it was removed by the LPF 14 and could not be detected as a target. This can be solved by expanding the reception band, but expanding the reception band requires changing the sampling period of the active sonar reception signal and the processing content of the signal processing device, increasing the overall size of the sonar device. So it was difficult to apply.

【0004】[0004]

【課題を解決するための手段】本発明のソーナー前処理
装置は、送受波器から送出される送信信号を出力する掃
引制御部と、目標物からのアクティブソーナー受信信号
を入力してベースバンド信号を出力する周波数変換部
と、前記送信周波数に無関係な任意の周波数のローカル
信号を供給するローカル信号発生部と、アクティブソー
ナー受信信号の帯域制限されたアナログ信号を前記送信
信号の周波数を中心とした受信帯域ならびに前記送信信
号の周波数から受信帯域幅を引いた周波数を中心とする
受信帯域ならびに前記送信信号の周波数に受信帯域幅を
加えた周波数を中心とする受信帯域の3つの帯域に分け
て目標物からのアクティブソーナー受信信号である1つ
の掃引内のアナログ信号成分を検出して表示する受信帯
域検出部とを備えている。
A sonar preprocessing device of the present invention is a baseband signal to which a sweep control section for outputting a transmission signal transmitted from a transceiver and an active sonar reception signal from a target are input. , A local signal generator that supplies a local signal of an arbitrary frequency irrelevant to the transmission frequency, and a band-limited analog signal of the active sonar reception signal centered on the frequency of the transmission signal. Targets are divided into three bands: a reception band and a reception band centered on a frequency obtained by subtracting the reception bandwidth from the frequency of the transmission signal and a reception band centered on a frequency obtained by adding the reception bandwidth to the frequency of the transmission signal. And a reception band detection unit for detecting and displaying an analog signal component in one sweep, which is an active sonar reception signal from an object That.

【0005】[0005]

【実施例】次に本発明について図面を参照して説明す
る。図1は本発明の一実施例のブロック図である。図1
において図2と同一の符号は同一の機能を有する。すな
わち、本実施例ではローカル信号発生部1と受信帯域検
出部2とを備えている。
The present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention. Figure 1
2, the same reference numerals as those in FIG. 2 have the same functions. That is, this embodiment includes the local signal generator 1 and the reception band detector 2.

【0006】次に本実施例の動作を説明する。掃引制御
部16は送信信号として送受波器に送出される。送受波
器で受信されるアクティブソーナー受信信号101は復
調部10にて復調デジタル信号102に復調され、復調
デジタル信号102はD/A変換部11にてアナログ信
号103に変換される。アナログ信号103はフィルタ
12に入力され、帯域制限された後にアナログ信号10
4として出力される。アナログ信号104は周波数変換
部13と受信帯域検出部2に出力される。ここで受信帯
域検出部2は帯域制限されたアナログ信号104をソー
ナー送信信号の周波数を中心とした受信帯域と、ソーナ
ー送信信号の周波数から受信帯域幅を引いた周波数を中
心とする受信帯域と、ソーナー送信信号の周波数に受信
帯域幅を加えた周波数を中心とする受信帯域の3つの帯
域に分け、それぞれの帯域ごとに1つの掃引内のアナロ
グ信号成分を検出して表示する。ローカル信号発生部1
は、ソーナー送信信号の周波数に無関係な任意の周波数
のローカル信号105を発生し、ローカル信号105の
周波数は受信帯域検出部2の表示をもとに人間が手操作
により設定する。周波数変換部13Aは、帯域制限され
たアナログ信号104とローカル信号発生部1から発生
されるローカル信号105とを掛けあわせ、ベースバン
ド信号106として出力する。ベースバンド信号106
は、LPF14Aにて受信帯域幅以上の周波数成分が除
去されA/D変換部15Aに出力される。A/D変換部
15Aでは帯域制限されたベースバンド信号107をア
ナログ信号からデジタル信号に変換し、信号処理装置に
出力する。ここでローカル信号の設定は受信帯域検出部
2の受信帯域を検出し、この表示をみながら行うので、
受信帯域の中心周波数に設定することができる。すなわ
ち送信信号の周波数を中心としてプラスマイナスの受信
帯域幅の間を確認できるので、受信帯域幅以上のドップ
ラシフトがあっても探知することができる。
Next, the operation of this embodiment will be described. The sweep control unit 16 is sent to the transceiver as a transmission signal. The active sonar reception signal 101 received by the transmitter / receiver is demodulated into a demodulation digital signal 102 in the demodulation unit 10, and the demodulation digital signal 102 is converted into an analog signal 103 in the D / A conversion unit 11. The analog signal 103 is input to the filter 12, is band-limited, and then the analog signal 10 is input.
It is output as 4. The analog signal 104 is output to the frequency conversion unit 13 and the reception band detection unit 2. Here, the reception band detection unit 2 has a reception band whose center is the frequency of the sonar transmission signal for the band-limited analog signal 104, and a reception band whose center is a frequency obtained by subtracting the reception bandwidth from the frequency of the sonar transmission signal. The sonar transmission signal is divided into three bands of a reception band centered on the frequency obtained by adding the reception band width to the frequency, and an analog signal component in one sweep is detected and displayed for each band. Local signal generator 1
Generates a local signal 105 having an arbitrary frequency irrelevant to the frequency of the sonar transmission signal, and the frequency of the local signal 105 is manually set by a human based on the display of the reception band detection unit 2. The frequency conversion unit 13A multiplies the band-limited analog signal 104 and the local signal 105 generated from the local signal generation unit 1 and outputs it as a baseband signal 106. Baseband signal 106
Is removed from the LPF 14A by a frequency component equal to or higher than the reception bandwidth, and is output to the A / D converter 15A. The A / D converter 15A converts the band-limited baseband signal 107 from an analog signal to a digital signal and outputs it to the signal processing device. Here, the local signal is set by detecting the reception band of the reception band detection unit 2 and observing this display.
It can be set to the center frequency of the reception band. That is, since it is possible to confirm a plus and minus reception bandwidth centered on the frequency of the transmission signal, it is possible to detect even if there is a Doppler shift that is greater than the reception bandwidth.

【0007】[0007]

【発明の効果】以上説明したように本発明は、受信帯域
検出部とローカル信号発生部とを備えることにより、従
来のソーナー装置の受信帯域幅の3倍の受信帯域幅内の
探知状況が概略確認できる。したがってソーナー送信信
号の周波数を中心として受信帯域幅以上のドップラーシ
フトを発生させる移動速度の速い目標物から反射される
受信信号に対しても除去することなく探知できるという
効果を有する。
As described above, according to the present invention, by including the reception band detection unit and the local signal generation unit, the detection situation within the reception bandwidth three times as large as the reception bandwidth of the conventional sonar device is roughly detected. I can confirm. Therefore, it is possible to detect a reception signal reflected from a target having a high moving speed that causes a Doppler shift exceeding the reception bandwidth centering on the frequency of the sonar transmission signal without removing it.

【図面の簡単な説明】[Brief description of drawings]

【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.

【図2】従来のソーナー前処理装置のブロック図であ
る。
FIG. 2 is a block diagram of a conventional sonar pretreatment device.

【符号の説明】[Explanation of symbols]

1 ローカル信号発生部 2 受信帯域検出部 10 復調部 11 D/A変換部 12 フィルタ 13,13A 周波数変換部 14,14A ローパスフィルタ 15,15A A/D変換部 16 掃引制御部 DESCRIPTION OF SYMBOLS 1 Local signal generation part 2 Reception band detection part 10 Demodulation part 11 D / A conversion part 12 Filter 13,13A Frequency conversion part 14,14A Low pass filter 15,15A A / D conversion part 16 Sweep control part

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 送受波器から送出される送信信号を出力
する掃引制御部と、目標物からのアクティブソーナー受
信信号を入力してベースバンド信号を出力する周波数変
換部と、前記送信周波数に無関係な任意の周波数のロー
カル信号を供給するローカル信号発生部と、アクティブ
ソーナー受信信号の帯域制限されたアナログ信号を前記
送信信号の周波数を中心とした受信帯域ならびに前記送
信信号の周波数から受信帯域幅を引いた周波数を中心と
する受信帯域ならびに前記送信信号の周波数に受信帯域
幅を加えた周波数を中心とする受信帯域の3つの帯域に
分けて目標物からのアクティブソーナー受信信号である
1つの掃引内のアナログ信号成分を検出して表示する受
信帯域検出部とを備えていることを特徴とするソーナー
前処理装置。
1. A sweep controller for outputting a transmission signal sent from a transceiver, a frequency converter for receiving an active sonar reception signal from a target and outputting a baseband signal, and a transmission frequency independent of the transmission frequency. A local signal generator that supplies a local signal of any desired frequency, and an active sonar reception signal with a band-limited analog signal as a reception band centered on the frequency of the transmission signal and a reception bandwidth from the frequency of the transmission signal. Within one sweep, which is an active sonar reception signal from the target, divided into three bands, a reception band centered on the subtracted frequency and a reception band centered on the frequency obtained by adding the reception bandwidth to the frequency of the transmission signal And a reception band detection unit that detects and displays the analog signal component of the sonar preprocessing device.
【請求項2】 監視者が前記受信帯域検出信号発生部の
表示を監視しながら、前記ローカル信号発生部のローカ
ル信号の周波数を調整することを特徴とする請求項1記
載のソーナー前処理装置。
2. The sonar pre-processing apparatus according to claim 1, wherein the supervisor adjusts the frequency of the local signal of the local signal generator while monitoring the display of the reception band detection signal generator.
JP11330092A 1992-05-06 1992-05-06 Sonar preprocessing apparatus Withdrawn JPH05312942A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11330092A JPH05312942A (en) 1992-05-06 1992-05-06 Sonar preprocessing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11330092A JPH05312942A (en) 1992-05-06 1992-05-06 Sonar preprocessing apparatus

Publications (1)

Publication Number Publication Date
JPH05312942A true JPH05312942A (en) 1993-11-26

Family

ID=14608724

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11330092A Withdrawn JPH05312942A (en) 1992-05-06 1992-05-06 Sonar preprocessing apparatus

Country Status (1)

Country Link
JP (1) JPH05312942A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003084060A (en) * 2001-09-10 2003-03-19 Furuno Electric Co Ltd Sonar

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003084060A (en) * 2001-09-10 2003-03-19 Furuno Electric Co Ltd Sonar
JP4737893B2 (en) * 2001-09-10 2011-08-03 古野電気株式会社 Underwater detector

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Legal Events

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Effective date: 19990706