JPH11258344A - Simultaneous picture scanning sonar device - Google Patents

Simultaneous picture scanning sonar device

Info

Publication number
JPH11258344A
JPH11258344A JP8028198A JP8028198A JPH11258344A JP H11258344 A JPH11258344 A JP H11258344A JP 8028198 A JP8028198 A JP 8028198A JP 8028198 A JP8028198 A JP 8028198A JP H11258344 A JPH11258344 A JP H11258344A
Authority
JP
Japan
Prior art keywords
signal
gate
received
specific
memory
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
Application number
JP8028198A
Other languages
Japanese (ja)
Inventor
Hiroyuki Nakamura
浩之 中村
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.)
Kaijo Corp
Original Assignee
Kaijo Corp
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 Kaijo Corp filed Critical Kaijo Corp
Priority to JP8028198A priority Critical patent/JPH11258344A/en
Publication of JPH11258344A publication Critical patent/JPH11258344A/en
Pending legal-status Critical Current

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

Abstract

PROBLEM TO BE SOLVED: To observe the change with time of a distance image from those received for a certain number of transmitted images in the past to those received currently for a plurality of arbitrarily selectable specific directions in addition to images for transmission in all reception wave beam scanning directions. SOLUTION: Specific direction setting equipment 4 inputs angle signals θA, θB, and θC in specific directions A, B, and C to gate generators 5, 6, and 7, respectively, and at the same time outputs a gate opening signal when a beam angle signal θmatches θA, θB, and θC being inputted, and sends them to gate circuits 8, 9, and 10, respectively. Each gate circuit passes a reception signal when the gate opening signal arrives and stores it for a fixed number of transmission times into corresponding simultaneous picture memories 11, 12, and 13. The signal is stored in a video RAM 14 along with all-direction images and is read and displayed on a display 15.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は超音波水中探知装置
の映像表示画面構成の技術分野に属する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of image display screen construction of an ultrasonic underwater detecting device.

【0002】[0002]

【従来の技術】従来の超音波水中探知装置、例えばマル
チビーム魚群探知機においては、図3の(a)に示すよ
うに船底直下およびそれから左右に一定角度を有する複
数の送受波ビーム(図でビームA、ビームB、ビーム
C)を形成し、各ビーム毎に超音波パルスの送受波を行
い、これによって得られた受信データによって図3の
(b)に示すような画像表示をしていた。即ち画面上を
各送受波ビームに対応させて区切り、それぞれ1回の送
受波に対し距離方向(図では縦方向)に1回の走査で画
像表示させ、送受波回数を重ねるにつれ時間軸方向(図
では右横方向)に移動させて左側から新しく表示して行
き、当該ビームによる映像の時間経過が分かるようにな
っている。
2. Description of the Related Art In a conventional ultrasonic underwater detecting apparatus, for example, a multi-beam fish finder, as shown in FIG. Beams A, B, and C) are formed, an ultrasonic pulse is transmitted and received for each beam, and an image is displayed as shown in FIG. . That is, the screen is divided in correspondence with each transmission / reception beam, and each transmission / reception wave is displayed as an image by one scanning in the distance direction (vertical direction in the figure) for each transmission / reception wave. In the figure, the image is moved to the right (in the horizontal right direction) and newly displayed from the left side, so that the time lapse of the image by the beam can be understood.

【0003】また、スキャニングソナーにおいては図4
の(a)に示すように、左右の舷側方向および船底直下
を含む方向範囲(約180度)に向けて超音波パルスを
送波し、その方向範囲中を一方舷側方向から他方舷側方
向へ受波ビームのスキャン(走査)を繰り返し、水中目
標物からの反射波を受波し、図4の(b)の左側に示す
ように上記方向範囲の全方向画面を表示するとともに、
特定の1方向(例えば図4の(a)のA方向の距離画像
(図3の(b)のような画像)を右側に併画することが
行われていた。
FIG. 4 shows a scanning sonar.
As shown in (a), the ultrasonic pulse is transmitted in a directional range (about 180 degrees) including the left and right side directions and directly below the bottom of the ship, and the ultrasonic pulse is transmitted from one side to the other side in the directional range. The scanning of the wave beam is repeated, the reflected wave from the underwater target is received, and an omnidirectional screen in the above directional range is displayed as shown on the left side of FIG.
A distance image (for example, an image as shown in FIG. 3B) in one specific direction (for example, the A direction in FIG. 4A) has been displayed on the right side.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、前記図
3のマルチビーム魚群探知機においては、いくつかの特
定方向の探知映像の時間経過は分かるがビームが向いて
いない方向については全く情報が入って来ないという問
題がある。また、図4のソナーにおいては全方向の情報
が得られるが、これらは特定方向を除いては送信毎に更
新され過去の映像は残らないため映像の時間経過による
変化が把握しずらい。特定の1方向については予め設定
した送受波回数分だけメモリに格納され距離画像として
併画表示されるから、この方向については水中目標の動
きの時間変化を把握することはできるが、その他の方向
についてはそのような情報は全く得られないという問題
がある。
However, in the multi-beam fish finder of FIG. 3, the time lapse of the detection images in some specific directions is known, but no information is contained in the direction in which the beam is not directed. There is a problem of not coming. Further, in the sonar of FIG. 4, information in all directions is obtained, but these are updated every transmission except for a specific direction, and past images do not remain. For one specific direction, the number of times of transmission and reception set in advance is stored in the memory and displayed as a distance image. Therefore, in this direction, the time change of the movement of the underwater target can be grasped. Has the problem that such information cannot be obtained at all.

【0005】本発明の目的は、上記従来装置の問題点に
鑑みて、全方向についてリアルタイムの情報が得られる
とともに多くの特定方向について目標映像の時間経過が
分かる画像を併画したスキャニングソナー装置を提供す
ることにある。
An object of the present invention is to provide a scanning sonar device which obtains real-time information in all directions and simultaneously displays images showing the time lapse of a target image in many specific directions in view of the above-mentioned problems of the conventional device. To provide.

【0006】[0006]

【課題を解決するための手段】本発明は、上記の目的を
達成するために次の手段構成を有する。即ち、本発明装
置は、左右の舷側方向および船底直下を含む方向範囲に
向けて超音波パルスを送波し、その方向範囲中、一方舷
側方向から他方舷側方向へ受波ビームのスキャンを繰り
返し水中目標物からの反射音波を受波し、上記方向範囲
の全方向画面を表示するとともに複数の特定方向の距離
軸画像を予め設定した送信回数分だけ同時に併画表示す
るスキャニングソナーであって、次の各構成を有するこ
とを特徴とする併画スキャニングソナー装置である。 (イ)受波信号を増幅検波しディジタル化した受信信号
に変換して出力する受信器 (ロ)受波ビームのビーム角度信号および、送波時から
の時間に比例する距離信号を受けてこれを直交座標で表
されるアドレス信号に変換して出力する座標変換器 (ハ)受信器からの受信信号を、座標変換器からのアド
レス信号の指示するアドレスのメモリ素子に順次格納し
ていく主メモリ (ニ)併画表示させたい複数の特定方向を設定しそれら
特定方向毎の特定角度信号を出力する特定方向設定器 (ホ)各特定方向毎に対応して設けられ、ビーム角度信
号と特定角度信号とを受けてビーム角度信号が特定角度
信号に一致したときにゲート開信号を出力する複数のゲ
ート発生器 (ヘ)各特定方向毎に対応させて設けられ、受信器から
の受信信号を入力とし、角度の対応するゲート発生器か
らゲート開信号が来たときに受信信号を通過出力させる
複数のゲート回路 (ト)各ゲート回路毎に対応させて設けられ距離信号を
アドレス信号とするメモリであって、ゲート回路からの
受信信号を距離信号の指示するアドレスのメモリ素子へ
格納していき、予め設定された送信回数に対応する受信
信号を格納する複数の併画メモリ (チ)主メモリに格納されていた受信画像および併画メ
モリに格納されていた受信画像を受けてこれを、記憶素
子配列空間のラスタースキャンによる1画面表示領域内
に予め定めたレイアウトで格納するビデオRAM (リ)ビデオRAMに格納された画像信号をラスタース
キャンで読み出し、ラスタースキャンで画像表示する表
示器
The present invention has the following means in order to achieve the above object. That is, the apparatus of the present invention transmits an ultrasonic pulse toward a directional range including the left and right side directions and immediately below the ship bottom, and repeatedly scans the receiving beam from one side to the other side in the directional range. A scanning sonar that receives a reflected sound wave from a target object, displays an omnidirectional screen in the above-mentioned direction range, and simultaneously displays a plurality of distance axis images in a specific direction simultaneously for a preset number of transmissions. A parallel scanning sonar device characterized by having the following configurations. (A) A receiver that amplifies and detects a received signal and converts it to a digitized received signal and outputs it. (B) Receives a beam angle signal of the received beam and a distance signal proportional to the time from the time of transmission. Is converted into an address signal represented by rectangular coordinates, and is output. (C) Mainly sequentially stores the received signal from the receiver in the memory element at the address indicated by the address signal from the coordinate converter. Memory (d) Specific direction setting device for setting a plurality of specific directions to be displayed in parallel and outputting specific angle signals for each specific direction (e) Provided corresponding to each specific direction and specifying a beam angle signal A plurality of gate generators that output a gate open signal when the beam angle signal matches the specific angle signal in response to the angle signal; and (f) a plurality of gate generators are provided corresponding to each specific direction, and receive signals from the receiver. As input A plurality of gate circuits for passing a received signal when a gate open signal is received from a gate generator corresponding to an angle. (G) A memory provided for each gate circuit and using a distance signal as an address signal. The received signal from the gate circuit is stored in the memory element at the address indicated by the distance signal, and a plurality of simultaneous memory memories storing received signals corresponding to a preset number of transmissions are stored in the main memory. A video RAM that receives the received image and the received image stored in the image memory and stores the received image in a predetermined layout in one screen display area by raster scan of the storage element array space. A display that reads out the stored image signal by raster scan and displays the image in raster scan

【0007】[0007]

【発明の実施の形態】本発明の実施の形態は、同時に併
画させる特定方向の数を予め定め、各特定方向の角度自
体は自由に設定できるようにする。こうすることにより
魚群の存在可能性のある方向に設定するとか、或いは捉
えた魚群の動きを予測或るいは観測し易い方向に設定す
ることができ特定方向画像を効果的に活用することがで
きる。受波ビームのスキャンによる受信信号は、従来通
りビーム角度信号と距離信号を直交座標に変換して、直
交座標アドレスによって主メモリへ一旦格納する。特定
方向は装置設計時に併画可能数を定め、各特定方向の角
度設定は、特定方向設定器によって任意の角度を設定し
得るようにする。そして、受波ビームのビーム角度信号
が特定方向の設定角度に一致したときの受信信号を併画
メモリに格納していく。この併画メモリには予め設定し
た回数の送信に対応する分の受信信号が格納され、その
送信回数に渡る受信信号の時間経過が分かることにな
る。このような併画メモリが特定方向の数分だけ用意さ
れている。
DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention, the number of specific directions to be simultaneously imaged is determined in advance, and the angle of each specific direction can be freely set. By doing so, it is possible to set the direction in which the school of fish is likely to exist, or to set the direction in which the movement of the captured school of fish can be predicted or observed so that the specific direction image can be effectively used. . A reception signal obtained by scanning the reception beam converts a beam angle signal and a distance signal into rectangular coordinates as in the related art, and temporarily stores them in a main memory using rectangular coordinate addresses. The specific direction determines the number of images that can be combined at the time of designing the apparatus, and the angle of each specific direction is set to an arbitrary angle by a specific direction setting device. Then, the reception signal when the beam angle signal of the reception beam coincides with the set angle in the specific direction is stored in the simultaneous memory. Received signals corresponding to the predetermined number of transmissions are stored in the simultaneous image memory, and the elapsed time of the received signal over the number of transmissions can be known. Such a parallel image memory is prepared for several times in a specific direction.

【0008】以上、主メモリおよび複数の併画メモリに
格納された受信信号は、表示器で1画面に表示できるよ
うにその前準備とし、予め定めた画面配置に従ってビデ
オRAMに格納される。表示器はこのビデオRAMから
ラスタースキャンによって読み出し、ラスタースキャン
で画面表示する。
As described above, the received signals stored in the main memory and the multiple image memories are prepared beforehand so that they can be displayed on one screen by the display device, and are stored in the video RAM according to a predetermined screen layout. The display reads out the video RAM by raster scan and displays the screen on the raster scan.

【0009】[0009]

【実施例】以下、本発明の併画スキャニングソナー装置
の実施例を図面を参照して説明する。図1は、本発明の
実施例の構成を示すブロック図である。受信器1からデ
ィジタル化された受信信号が主メモリ3およびゲート回
路8,9,10へ送られている。受波ビームのビーム角
度信号θは座標変換器2およびゲート発生器5,6,7
へ入力されている。座標変換器2へは送信時からの時間
に比例する距離信号rも入力されており、ビーム角度信
号θと距離信号rとで表される極座標位置情報を直交座
標で表されるアドレス信号に変換する。主メモリ3は、
この直交座標アドレス信号の指示するアドレスのメモリ
素子へ受信信号を順次格納していく。こうして、図2の
(a)に示すような左右の舷側方向および船底直下を含
む方向範囲(およそ180度)の受波信号が格納され
る。
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a parallel scanning sonar apparatus according to the present invention. FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention. A digitized reception signal is sent from the receiver 1 to the main memory 3 and the gate circuits 8, 9, 10. The beam angle signal θ of the received beam is converted by the coordinate converter 2 and the gate generators 5, 6, and 7.
Has been entered. The coordinate converter 2 also receives a distance signal r proportional to the time from the time of transmission, and converts polar coordinate position information represented by the beam angle signal θ and the distance signal r into an address signal represented by rectangular coordinates. I do. The main memory 3
The received signal is sequentially stored in the memory element at the address indicated by the orthogonal coordinate address signal. In this way, the received signals in the directional range (approximately 180 degrees) including the left and right side directions and just below the ship bottom as shown in FIG. 2A are stored.

【0010】一方、特定方向設定器4では図2の(a)
に示すような3つの特定方向A,B,Cの角度を設定す
ることができ、特定角度信号θA、θB、θC を出力する。
特定角度信号θA、θB、θC はそれぞれゲート発生器5,
6,7へ送られる。そして各ゲート発生器は、入力され
ているビーム角度信号θがそれぞれに入力されている特
定角度信号θA、θB、θC に一致したときにゲート開信号
を出力する。ゲート発生器5のゲート開信号はゲート回
路8へ入力され、ゲート発生器6のゲート開信号はゲー
ト回路9へ入力され、ゲート発生器7のゲート開信号は
ゲート回路10へ入力される。
On the other hand, in the specific direction setting device 4, FIG.
The angles of the three specific directions A, B, and C can be set, and specific angle signals θ A , θ B , and θ C are output.
The specific angle signals θ A , θ B , θ C are respectively generated by the gate generators 5,
It is sent to 6,7. Each gate generator outputs a gate open signal when the input beam angle signal θ matches the specific angle signals θ A , θ B , and θ C respectively input. The gate open signal of the gate generator 5 is input to the gate circuit 8, the gate open signal of the gate generator 6 is input to the gate circuit 9, and the gate open signal of the gate generator 7 is input to the gate circuit 10.

【0011】各ゲート回路は、ゲート開信号が来たとき
に、受信信号を通過させ、それぞれ対応する併画メモリ
11,12,13へ送る。各併画メモリには距離信号が
アドレス信号として入力されており、距離信号の指示す
るアドレスのメモリ素子へ受信信号を格納していく。こ
こでは予め定め送信回数に対応する受信信号が格納され
る。こうして、3つの特定方向A,B,Cにおける距離
に対する受信信号が予め定めた送信回数分だけ、併画メ
モリ11,12,13に格納されることになる。
When each gate circuit receives a gate open signal, it passes a received signal and sends it to the corresponding image memory 11, 12, or 13. A distance signal is input as an address signal to each of the simultaneous image memories, and the received signal is stored in a memory element at an address indicated by the distance signal. Here, received signals corresponding to a predetermined number of transmissions are stored. In this way, the reception signals corresponding to the distances in the three specific directions A, B, and C are stored in the simultaneous image memories 11, 12, and 13 by the predetermined number of transmissions.

【0012】こうして主メモリ3および併画メモリ1
1,12,13に格納された受信信号は、表示器15の
1画面に対応するビデオRAM14へ、例えば図2の
(b)に示すようなレイアウトになるように転送格納さ
れる。そしてビデオRAM14をラスタースキャンで走
査読み出しして、表示器15でラスタースキャン表示す
る。こうして、送信毎に更新される全方向受信画面と、
複数の特定方向について予め定めた回数の過去の送信時
から現送信時までの受信像の時間経過像を一画面上に併
画することができる。
Thus, the main memory 3 and the parallel image memory 1
The received signals stored in 1, 12, and 13 are transferred and stored in the video RAM 14 corresponding to one screen of the display 15 in a layout such as that shown in FIG. Then, the video RAM 14 is scanned and read by the raster scan, and the display 15 displays the raster scan. Thus, an omnidirectional receiving screen updated for each transmission,
A time-lapse image of a reception image from a predetermined number of transmissions in the past to a current transmission in a plurality of specific directions can be simultaneously displayed on one screen.

【0013】[0013]

【発明の効果】以上説明したように、本発明のスキャニ
ングソナーでは、送信毎に更新される全方向受信画面に
より現時の水中の目標状況を観測し得るとともに、同一
画面上で同時に、注目した複数の特定方向について一定
の過去の時点から現在に至るまでの目標映像の時間的経
過を把握できるので、魚影探索或いは捕獲に従来よりも
効果的な威力を発揮するという利点がある。
As described above, in the scanning sonar of the present invention, the current underwater target situation can be observed on the omnidirectional reception screen updated for each transmission, and a plurality of attention states can be simultaneously displayed on the same screen. Since the time course of the target image from a certain point in the past to the present in the specific direction can be ascertained, there is an advantage that it is more effective than ever for searching or capturing fish shadows.

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

【図1】本発明の併画スキャニングソナー装置の実施例
の構成を示すブロック図である。
FIG. 1 is a block diagram showing a configuration of an embodiment of a simultaneous image scanning sonar device of the present invention.

【図2】本発明の併画スキャニングソナー装置における
画面表示例を示す図である。
FIG. 2 is a diagram showing an example of a screen display in the simultaneous scanning sonar apparatus of the present invention.

【図3】従来のマルチビーム魚群探知機の送受波ビーム
の状況および表示画像例を示す図である。
FIG. 3 is a diagram showing a state of a transmitted / received beam of a conventional multi-beam fish finder and an example of a display image.

【図4】従来のスキャニングソナーの受波ビームスキャ
ン状況および表示画像例を示す図である。
FIG. 4 is a diagram showing a receiving beam scanning state and a display image example of a conventional scanning sonar.

【符号の説明】[Explanation of symbols]

1 受信器 2 座標変換器 3 主メモリ 4 特定方向設定器 5〜7 ゲート発生器 8〜10 ゲート回路 11〜13 併画メモリ 14 ビデオRAM 15 表示器 REFERENCE SIGNS LIST 1 receiver 2 coordinate converter 3 main memory 4 specific direction setting device 5-7 gate generator 8-10 gate circuit 11-13 simultaneous memory 14 video RAM 15 display

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 左右の舷側方向および船底直下を含む方
向範囲に向けて超音波パルスを送波し、その方向範囲
中、一方舷側方向から他方舷側方向へ受波ビームのスキ
ャンを繰り返し水中目標物からの反射音波を受波し、上
記方向範囲の全方向画面を表示するとともに複数の特定
方向の距離軸画像を予め設定した送信回数分だけ同時に
併画表示するスキャニングソナーであって、次の各構成
を有することを特徴とする併画スキャニングソナー装
置。 (イ)受波信号を増幅検波しディジタル化した受信信号
に変換して出力する受信器 (ロ)受波ビームのビーム角度信号および、送波時から
の時間に比例する距離信号を受けてこれを直交座標で表
されるアドレス信号に変換して出力する座標変換器 (ハ)受信器からの受信信号を、座標変換器からのアド
レス信号の指示するアドレスのメモリ素子に順次格納し
ていく主メモリ (ニ)併画表示させたい複数の特定方向を設定しそれら
特定方向毎の特定角度信号を出力する特定方向設定器 (ホ)各特定方向毎に対応して設けられ、ビーム角度信
号と特定角度信号とを受けてビーム角度信号が特定角度
信号に一致したときにゲート開信号を出力する複数のゲ
ート発生器 (ヘ)各特定方向毎に対応させて設けられ、受信器から
の受信信号を入力とし、角度の対応するゲート発生器か
らゲート開信号が来たときに受信信号を通過出力させる
複数のゲート回路 (ト)各ゲート回路毎に対応させて設けられ距離信号を
アドレス信号とするメモリであって、ゲート回路からの
受信信号を距離信号の指示するアドレスのメモリ素子へ
格納していき、予め設定された送信回数に対応する受信
信号を格納する複数の併画メモリ (チ)主メモリに格納されていた受信画像および併画メ
モリに格納されていた受信画像を受けてこれを、記憶素
子配列空間のラスタースキャンによる1画面表示領域内
に予め定めたレイアウトで格納するビデオRAM (リ)ビデオRAMに格納された画像信号をラスタース
キャンで読み出し、ラスタースキャンで画像表示する表
示器
An ultrasonic pulse is transmitted in a direction range including right and left side directions and a direction immediately below a ship bottom, and scanning of a reception beam is repeated from one side to the other side in the direction range. A scanning sonar which receives reflected sound waves from the same, displays an omnidirectional screen in the above-mentioned direction range, and simultaneously displays a plurality of distance axis images in a specific direction in parallel for a preset number of transmissions. A parallel scanning sonar device having a configuration. (A) A receiver that amplifies and detects a received signal and converts it to a digitized received signal and outputs it. (B) Receives a beam angle signal of the received beam and a distance signal proportional to the time from the time of transmission. Is converted into an address signal represented by rectangular coordinates, and is output. (C) Mainly sequentially stores the received signal from the receiver in the memory element at the address indicated by the address signal from the coordinate converter. Memory (d) Specific direction setting device for setting a plurality of specific directions to be displayed in parallel and outputting specific angle signals for each specific direction (e) Provided corresponding to each specific direction and specifying a beam angle signal A plurality of gate generators that output a gate open signal when the beam angle signal matches the specific angle signal in response to the angle signal; and (f) a plurality of gate generators are provided corresponding to each specific direction, and receive signals from the receiver. As input A plurality of gate circuits for passing a received signal when a gate open signal is received from a gate generator corresponding to an angle. (G) A memory provided for each gate circuit and using a distance signal as an address signal. The received signal from the gate circuit is stored in the memory element at the address indicated by the distance signal, and a plurality of simultaneous memory memories storing received signals corresponding to a preset number of transmissions are stored in the main memory. A video RAM that receives the received image and the received image stored in the image memory and stores the received image in a predetermined layout in one screen display area by raster scan of the storage element array space. A display that reads out stored image signals by raster scan and displays images by raster scan
JP8028198A 1998-03-12 1998-03-12 Simultaneous picture scanning sonar device Pending JPH11258344A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8028198A JPH11258344A (en) 1998-03-12 1998-03-12 Simultaneous picture scanning sonar device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8028198A JPH11258344A (en) 1998-03-12 1998-03-12 Simultaneous picture scanning sonar device

Publications (1)

Publication Number Publication Date
JPH11258344A true JPH11258344A (en) 1999-09-24

Family

ID=13713900

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8028198A Pending JPH11258344A (en) 1998-03-12 1998-03-12 Simultaneous picture scanning sonar device

Country Status (1)

Country Link
JP (1) JPH11258344A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004257796A (en) * 2003-02-25 2004-09-16 Kaijo Sonic Corp Scanning sonar

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004257796A (en) * 2003-02-25 2004-09-16 Kaijo Sonic Corp Scanning sonar

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