JPH05249240A - Fish finder - Google Patents
Fish finderInfo
- Publication number
- JPH05249240A JPH05249240A JP4045441A JP4544192A JPH05249240A JP H05249240 A JPH05249240 A JP H05249240A JP 4045441 A JP4045441 A JP 4045441A JP 4544192 A JP4544192 A JP 4544192A JP H05249240 A JPH05249240 A JP H05249240A
- Authority
- JP
- Japan
- Prior art keywords
- band
- fish
- transmission
- pulse width
- reception
- 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.)
- Granted
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、単一の送受波器を有す
る魚群探知機に関する。FIELD OF THE INVENTION The present invention relates to a fish finder having a single transducer.
【０００２】[0002]
【従来の技術】一般に、魚群探知機を利用して魚群を探
知、捕獲するには、通常、２つの段階を踏む。まず、段
階(１)では、漁船の船速を早めて広い海域にわたって航
行しつつ、魚群探知機で魚群の反応の有無を観察する。
そして、段階(２)では、魚群反応が見つかると、船速を
落としたり、あるいは停泊するなどして魚群探知機で一
層詳細にその探索した魚群の分布状態等を調べ、捕獲す
るか否かの判断を下した後、網等の釣り具によって魚を
捕る。2. Description of the Related Art Generally, in order to detect and catch a school of fish using a fish finder, usually two steps are taken. First, in step (1), the speed of the fishing boat is increased to navigate over a wide sea area, and the fish finder is used to observe the presence or absence of reaction of the fish.
Then, in step (2), when a fish school reaction is found, the speed of the ship is slowed down or the ship is moored to check the distribution of the searched fish school in more detail with a fish finder to determine whether or not to capture it. After making a decision, catch the fish with a fishing tackle such as a net.
【０００３】このように、魚群を探知する段階(１)、
(２)に応じて魚群探知機の果たす役割もそれぞれ異なっ
てくる。In this way, the stage (1) of detecting a school of fish,
Depending on (2), the role played by the fish finder also varies.
【０００４】すなわち、段階(１)では、魚群等の有無を
確認できれば良く、魚群の分布状態等の細かい観察まで
は必要でない。しかも、魚群の有無を広範囲に渡って探
索するため船速を上げているので外来ノイズも多い。し
たがって、この段階(１)において魚群探知機に要求され
る性能としては、探知物標に対する分解能は低くても、
外来ノイズの影響を受けることなく受信信号を確実に捕
捉できることである。That is, in step (1), it is sufficient to confirm the presence or absence of a school of fish, and it is not necessary to make a detailed observation of the distribution of the school of fish. Moreover, since the speed of the ship is increased to search for the presence or absence of a school of fish over a wide range, there is also a lot of extraneous noise. Therefore, as the performance required for the fish finder at this stage (1), even if the resolution for the detection target is low,
That is, the received signal can be reliably captured without being affected by external noise.
【０００５】また、段階(２)では、魚群の分布状態、魚
種、魚量等を細かく観察することが必要であり、このと
きは、船速を落としているので外来ノイズは比較的少な
い。したがって、この段階(２)において魚群探知機に要
求される性能は、探知物標に対する分解能が高く、か
つ、広い周波数範囲に渡って受信信号を捕捉できること
である。Further, in the step (2), it is necessary to observe the distribution state of the school of fish, the species of fish, the amount of fish and the like in detail. At this time, the boat speed is lowered, so that the external noise is relatively small. Therefore, the performance required for the fish finder at this stage (2) is that the fish finder has a high resolution with respect to the detection target and that the received signal can be captured over a wide frequency range.
【０００６】[0006]
【発明が解決しようとする課題】ところが、従来の魚群
探知機は、魚群を探知する段階(１)，(２)に応じてその
要求性能が変わるという点について十分に考慮されてお
らず、超音波の送受波器に加える送信パルス幅や送受波
器で得られる受信信号の受信帯域等の送受波特性は予め
固定された構成となっている。このため、従来の魚群探
知機では、魚群を探知する各段階(１)，(２)に応じて適
切な探知情報を得るのが不十分であった。However, the conventional fish finder does not sufficiently consider that the required performance changes depending on the steps (1) and (2) of detecting the fish school. The wave transmission / reception characteristics such as the transmission pulse width applied to the wave transmission / reception device and the reception band of the reception signal obtained by the wave transmission / reception device are fixed in advance. For this reason, it has been insufficient for the conventional fish finder to obtain appropriate detection information according to each stage (1) and (2) of detecting a fish school.
【０００７】これを改善するには、各段階(１)，(２)に
応じてパネル操作やメニュー操作によって、超音波の送
受波器に加える送信パルス幅や、送受波器で得られる受
信信号の受信帯域等の送受波特性を設定変更できる構成
とすることが考えられるが、魚群探知の状況が変わるた
びに、その都度、これらの送受波特性を変更するのは、
変更操作が極めて煩雑になるばかりでなく、設定を誤る
ことがある等の不具合がある。In order to improve this, the transmission pulse width applied to the ultrasonic wave transmitter / receiver and the received signal obtained by the wave transmitter / receiver are operated by panel operation or menu operation in accordance with each step (1) or (2). It is conceivable that the transmission and reception characteristics such as the reception band of can be changed, but each time the situation of fish finder changes, these transmission and reception characteristics are changed.
Not only is the change operation extremely complicated, but there are problems such as incorrect settings.
【０００８】さらに、漁船に予め送信周波数が異なる複
数の送受波器を取り付け、魚群の探知段階に応じてこれ
らの送受波器を選択使用することも可能であるが、複数
の送受波器を漁船に常設するのはコストアップとなる。Further, it is possible to attach a plurality of transducers having different transmission frequencies to the fishing boat in advance and select and use the transducers according to the detection stage of the school of fish. It would be costly to install it permanently.
【０００９】本発明は、このような問題点を解決するた
になされたもので、魚群を捕獲する段階に応じて常に最
適の性能が得られるように、超音波の送受波特性が自動
的に変更されるようにすることを課題とする。The present invention has been made to solve such problems, and the ultrasonic wave transmission / reception characteristics are automatically adjusted so that optimum performance can always be obtained depending on the stage at which a school of fish is caught. The task is to be changed to.
【００１０】[0010]
【課題を解決するための手段】上述のように、魚群の探
知、捕獲の段階(１)、(２)に密接に関連するのは、漁船
の船速である。したがって、船速の大小に応じて、魚群
探知機の送受波特性を変更すれば、段階(１)，(２)に応
じた探知情報が得られることになる。As described above, the speed of a fishing boat is closely related to the steps (1) and (2) of detecting and catching a school of fish. Therefore, if the transmission / reception characteristics of the fish finder are changed according to the speed of the ship, the detection information corresponding to the steps (1) and (2) can be obtained.
【００１１】本発明は、この事実に着目したものであっ
て、上記の課題を解決するために、送信パルスにより駆
動され、かつ、この送信パルスにパルス幅に対応した時
間長さで超音波を送波するとともに、探知物標から反射
された超音波を受波する送受波器を備えた魚群探知機に
おいて、次の構成を採る。The present invention focuses on this fact, and in order to solve the above-mentioned problems, ultrasonic waves are driven by a transmission pulse and ultrasonic waves are transmitted for a time length corresponding to the pulse width of the transmission pulse. The following configuration is adopted in a fish finder that includes a transmitter / receiver that transmits ultrasonic waves and that receives the ultrasonic waves reflected from the detection target.
【００１２】すなわち、本発明に係る魚群探知機では、
船速を検出する船速検出手段で検出された船速の大きさ
に応じて前記送受波器に与える送信パルスのパルス幅を
変更する送信パルス幅変更手段と、前記速度検出手段で
検出された船速の大きさに応じて送受波器で得られる受
信信号の受信帯域を変更する受信帯域変更手段とを含
む。That is, in the fish finder according to the present invention,
The transmission pulse width changing means for changing the pulse width of the transmission pulse given to the transducer according to the size of the ship speed detected by the ship speed detecting means for detecting the ship speed, and the speed detecting means Reception band changing means for changing the reception band of the reception signal obtained by the transmitter / receiver according to the magnitude of the ship speed.
【００１３】[0013]
【作用】上記構成において、船速検出手段によって船速
が検出されると、その船速の大きさに応じて、送信パル
ス幅変更手段が送受波器に与える送信パルスのパルス幅
を変更すると同時に、受信帯域変更手段が送受波器で得
られる受信信号の受信帯域を変更する。つまり、船速の
大きさに応じて送受波特性が自動的に変更されるため、
魚群を探知、捕獲する各段階に応じて適切な探知情報を
得ることができることになる。In the above structure, when the ship speed detecting means detects the ship speed, the transmission pulse width changing means changes the pulse width of the transmission pulse given to the transducer according to the magnitude of the ship speed. The receiving band changing means changes the receiving band of the received signal obtained by the wave transmitter / receiver. In other words, the transmission and reception characteristics are automatically changed according to the speed of the ship,
Appropriate detection information can be obtained according to each stage of detecting and catching a school of fish.
【００１４】[0014]
【実施例】図１は本発明の実施例に係る魚群探知機の全
体構成を示すブロック図である。1 is a block diagram showing the overall construction of a fish finder according to an embodiment of the present invention.
【００１５】同図において、符号１は魚群探知機の全体
を示し、２は超音波を送受波する単一の送受波器、４は
送受波器２に超音波発射用の送信信号eを出力する送信
部、６は送受波器２で得られる受信信号iのノイズ成分
を除くとともに、増幅を行う受信部、８は超音波の送受
波に応じて送信部４と受信部６との接続を切り換える送
受切換部、１０は受信部６から出力される受信信号fま
たはgをデジタル化するＡ／Ｄ変換器である。In the figure, reference numeral 1 denotes the whole fish finder, 2 a single transducer for transmitting and receiving ultrasonic waves, 4 a transmission signal e for ultrasonic emission to the transducer 2. The transmitting unit 6 performs the removal of the noise component of the received signal i obtained by the wave transmitter / receiver 2, and the receiving unit 8 performs the amplification, and 8 connects the transmitting unit 4 and the receiving unit 6 in accordance with the transmission / reception of ultrasonic waves. A transmission / reception switching unit 10 for switching is an A / D converter for digitizing the reception signal f or g output from the reception unit 6.
【００１６】また、１２は漁船の船速sを検出する船速
検出手段としての船速計である。なお、この船速計１２
に代えてＧＰＳ等の航法装置により船速を検出するもの
であってもよい。Reference numeral 12 is a speedometer as a speed detecting means for detecting the speed s of the fishing boat. In addition, this speedometer 12
Instead of this, the navigation device such as GPS may be used to detect the ship speed.
【００１７】１４は送信部４に超音波発射タイミングを
決めるキーイングパルスaを出力し、また、送信部４と
受信部６とに船速計１２で検出される漁船の船速sの大
きさに応じて送受波特性を変更するための切換信号b，d
をそれぞれ出力するとともに、Ａ／Ｄ変換器１０でデジ
タル化された受信信号を画像データとして取り込んで画
像表示処理を行う制御処理部、１６は探知画像を表示す
るカラーＣＲＴ等の表示器である。The reference numeral 14 outputs a keying pulse a for determining the ultrasonic wave emission timing to the transmission unit 4, and also controls the transmission unit 4 and the reception unit 6 to indicate the speed s of the fishing boat detected by the speedometer 12. Switching signals b and d for changing the transmission / reception characteristics accordingly
, A control processing unit that captures the received signal digitized by the A / D converter 10 as image data and performs image display processing, and 16 is a display such as a color CRT that displays a detected image.
【００１８】図２(Ａ)は送信部４の詳細を示す構成図で
ある。FIG. 2A is a block diagram showing the details of the transmission unit 4.
【００１９】図２(Ａ)において、１８は制御処理部１４
から与えられるキーイングパルスaに応答して所定のパ
ルス幅t1またはt2(＜t1)を有する送信パルスcを出力す
る送信パルス発生回路であって、たとえば、単安定マル
チバイブレータが適用される。２０は船速計１２で検出
された船速sの大きさに応じて送受波器２に与える送信
パルスcのパルス幅をt1あるいはt2に変更する送信パル
ス幅変更手段、２２は送信パルス発生回路１８からの送
信パルスcを送受波器２と同じ共振周波数をもつ送信信
号eに変調して出力するための発振出力回路である。In FIG. 2A, 18 is a control processing unit 14.
A transmission pulse generation circuit which outputs a transmission pulse c having a predetermined pulse width t 1 or t 2 (<t 1 ) in response to a keying pulse a given from, for example, a monostable multivibrator is applied. .. Reference numeral 20 is a transmission pulse width changing means for changing the pulse width of the transmission pulse c given to the transducer 2 to t 1 or t 2 in accordance with the magnitude of the ship speed s detected by the speedometer 12, and 22 is a transmission pulse. It is an oscillation output circuit for modulating the transmission pulse c from the generation circuit 18 into a transmission signal e having the same resonance frequency as the transceiver 2, and outputting the modulated transmission signal e.
【００２０】上記の送信パルス幅変更手段２０は、送信
パルス発生回路１８に接続された１つのコンデンサＣ、
このコンデンサＣに共通に接続された２つの抵抗Ｒ1，
Ｒ2(ただし、Ｒ1＞Ｒ2)、各抵抗Ｒ1，Ｒ2に個別に接続
されたオン・オフ用のスイッチ２４1，２４2、および制
御処理部１４からの送信パルス幅切換信号bに応じて各
スイッチ２４1，２４2の一方を選択動作させるためのイ
ンバータ２６からなり、各スイッチ２４1，２４2には共
に電源電圧Ｖccが印加されるようになっている。The above-mentioned transmission pulse width changing means 20 comprises one capacitor C connected to the transmission pulse generating circuit 18,
Two resistors R 1 commonly connected to this capacitor C,
R 2 (provided that, R 1> R 2), each resistor R 1, the switch 24 1 for R 2 individually connected to the on-off, 24 2, and sends the pulse width switching signal b from the control processor 14 an inverter 26 for selectively operating one of the switches 24 1, 24 2 in accordance with, the switches 24 1, 24 2 both power supply voltage Vcc is adapted to be applied.
【００２１】図２(Ｂ)は受信部６の詳細を示す構成図で
ある。FIG. 2B is a block diagram showing the details of the receiving unit 6.
【００２２】図２(Ｂ)において、３０は受信信号を増幅
する前段増幅器、３２は船速計１２で検出された船速の
大きさに応じて送受波器２で得られる受信信号の受信帯
域を変更する受信帯域変更手段、３４はこの受信帯域変
更手段３２を通過した受信信号を増幅する後段増幅器で
ある。In FIG. 2B, 30 is a pre-amplifier for amplifying the received signal, 32 is the reception band of the received signal obtained by the transducer 2 according to the speed of the ship detected by the speedometer 12. Is a receiving band changing means for changing the receiving frequency, and 34 is a post-stage amplifier for amplifying the received signal passing through the receiving band changing means 32.
【００２３】上記の受信帯域変更手段３２は、狭帯域フ
ィルタ３８1、この狭帯域フィルタ３８1の前後に設けら
れたオン・オフ用のスイッチ３６1，４０1、広帯域フィ
ルタ３８2、この広狭帯域フィルタ３８2の前後に設けら
れたオン・オフ用のスイッチ３６2，４０2、および制御
処理部１４からの帯域切換信号dに応じて各スイッチ３
６1，４０1または３６2，４０2の一方を選択動作させる
ためのインバータ４０からなる。そして、狭帯域フィル
タ３８1は、図３の一点鎖線で示すように、送受波器２
の中心周波数f0を中心とした所定の周波数帯域Δ1(本例
では５ＫＨzの幅)をもつように設定されており、また、
広帯域フィルタ３８2は、図３の実線で示すように、送
受波器２の中心周波数f０を中心として、狭帯域フィル
タ３８1よりも大きい所定の周波数帯域(本例では２０Ｋ
Ｈzの幅)をもつように設定されている。The receiving band changing device 32 described above, the narrowband filter 38 1, switch 36 1 for the narrow-band filter 38 first on-off provided in the front and rear, 40 1, the wideband filter 38 2, the wide and narrow band Each of the switches 3 2 and 40 2 provided before and after the filter 38 2 and each of the switches 3 according to the band switching signal d from the control processing unit 14
An inverter 40 for selectively operating one of 6 1 , 40 1 or 36 2 , 40 2 . Then, the narrow band filter 38 1 , as shown by the alternate long and short dash line in FIG.
Is set to have a predetermined frequency band Δ 1 (width of 5 kHz in this example) centered on the center frequency f 0 of
As shown by the solid line in FIG. 3, the broadband filter 38 2 has a predetermined frequency band (20K in this example) larger than the narrow band filter 38 1 with the center frequency f0 of the transducer 2 as the center.
Hz width).
【００２４】次に、上記構成の魚群探知機の動作を図４
に示すフローチャート、および図５に示すタイムチャー
トを参照して説明する。Next, the operation of the fish finder having the above configuration will be described with reference to FIG.
This will be described with reference to the flowchart shown in FIG. 5 and the time chart shown in FIG.
【００２５】電源投入によって制御処理部１４のソフト
プログラムが起動されると、制御処理部１４は、初期設
定を行った後(ステップ１)、送信パルス幅および受信帯
域を切り換える判断の目安となる船速の基準値uを入力
する(ステップ２)。また、船速計１２で検出された船速
sのデータを取り込む(ステップ３)。そして、基準値uと
実際の船速sとを比較する(ステップ４)。When the software program of the control processing unit 14 is started by turning on the power, the control processing unit 14 performs initial setting (step 1) and then serves as a guide for determining whether to switch the transmission pulse width and the reception band. The reference value u of speed is input (step 2). In addition, the ship speed detected by the speedometer 12
The data of s is taken in (step 3). Then, the reference value u is compared with the actual ship speed s (step 4).
【００２６】ここで、船速sが基準値uよりも大きい場合
(s≧u)には、前述した段階(１)の状態にあると見なせる
ので、制御処理部１４は、送信部４にハイレベルの送信
パルス幅切換信号bを、受信部６にハイレベルの受信帯
域切換信号dをそれぞれ出力する(ステップ５，６)。Here, when the ship speed s is larger than the reference value u
When (s ≧ u), it can be considered that the state is the state of the above-mentioned step (1). The reception band switching signals d are output respectively (steps 5 and 6).
【００２７】送信部４において、ハイレベルの送信パル
ス幅切換信号bが入力されると、送信パルス幅変更手段
２０の一方のスイッチ２４1がオンし、これにより、送
信パルス発生回路１８には、コンデンサＣと抵抗Ｒ1が
接続されることになる。また、受信部６においては、ハ
イレベルの受信帯域切換信号dが入力されると、受信帯
域変更手段３２の狭帯域フィルタ３８1の前後のスイッ
チ３６1，４０1が共にオンする。When the high level transmission pulse width switching signal b is input to the transmission section 4, one switch 24 1 of the transmission pulse width changing means 20 is turned on, whereby the transmission pulse generating circuit 18 is The capacitor C and the resistor R 1 will be connected. Further, in the receiving section 6, when the high level reception band switching signal d is input, both the switches 36 1 and 40 1 before and after the narrow band filter 38 1 of the reception band changing means 32 are turned on.
【００２８】この状態で、次に、制御処理部１４は、送
信部４にキーイングパルスaを出力する(ステップ７)。
このキーイングパルスaに応答して送信パルス発生回路
１８からは、コンデンサＣと抵抗Ｒ1によって決定され
る所定のパルス幅t1を有する送信パルスcが出力され
る。そして、この送信パルスcは、次段の発振出力回路
２２によって送受波器２と同じ共振周波数をもつ送信信
号eに変調されて出力され、この送信信号eが送受切換部
８を介して送受波器２に加わる。ここで、上記の送信パ
ルスcのパルス幅t1は、比較的長いために、分解能は小
さいが、出力パワーが大きくなるので、深い深度領域ま
で探知することができる。In this state, the control processor 14 then outputs the keying pulse a to the transmitter 4 (step 7).
In response to the keying pulse a, the transmission pulse generating circuit 18 outputs a transmission pulse c having a predetermined pulse width t 1 determined by the capacitor C and the resistor R 1 . Then, this transmission pulse c is modulated by the oscillation output circuit 22 of the next stage into a transmission signal e having the same resonance frequency as that of the wave transmitter / receiver 2 and output, and this transmission signal e is transmitted / received via the transmission / reception switching unit 8. Join the vessel 2. Here, since the pulse width t 1 of the transmission pulse c is relatively long, the resolution is small, but the output power is large, so that it is possible to detect a deep depth region.
【００２９】送受波器２での超音波の送受波に基づいて
得られる受信信号iは、送受切換部８を介して受信部６
に入力される。この受信信号iは、前段増幅器３０、ス
イッチ３６1を順次介して狭帯域フィルタ３８1に入力さ
れ、所定の受信帯域Δ1(５ＫＨz)から外れる信号成分が
除かれる。つまり、船速sが基準値uよりも大きい場合(s
≧u)には、スクリュー音等の外来ノイズが多くなるた
め、受信帯域Δ1を狭くすることで、これらの外来ノイ
ズを除いて受信信号fを確実に捕捉することができるこ
とになる。そして、この狭帯域フィルタ３８1を通過し
た受信信号fは、スイッチ４０1、後段増幅器３４を介し
てＡ／Ｄ変換器１０でデジタル化された後、制御処理部
１４に取り込まれる(ステップ８)。そして、データ取り
込みが終了していなければ(ステップ９)、ステップ３に
戻る。これに対して、所定量の受信信号のデータが取り
込まれると、制御処理部１４は、これを画像信号にして
表示部１６に出力するので、これによって探知画像が表
示される。The reception signal i obtained based on the transmission / reception of ultrasonic waves in the transmitter / receiver 2 is transmitted via the transmission / reception switching unit 8 to the reception unit 6
Entered in. The received signal i is input to the narrow band filter 38 1 via the pre-stage amplifier 30 and the switch 36 1 in order, and the signal component outside the predetermined received band Δ 1 (5 KHz) is removed. That is, when the ship speed s is greater than the reference value u (s
In the case of ≧ u), external noise such as a screw sound increases, so that by narrowing the reception band Δ 1 , it is possible to reliably capture the received signal f excluding these external noises. The received signal f that has passed through the narrow band filter 38 1 is digitized by the A / D converter 10 via the switch 40 1 and the post-stage amplifier 34, and then taken into the control processing unit 14 (step 8). .. If the data acquisition is not completed (step 9), the process returns to step 3. On the other hand, when a predetermined amount of received signal data is captured, the control processing unit 14 converts this into an image signal and outputs the image signal to the display unit 16, whereby the detected image is displayed.
【００３０】一方、船速sが基準値uよりも小さい場合(s
＜u)には、前述した段階(２)の状態にあると見なせるの
で、制御処理部１４は、送信部４にローレベルの送信パ
ルス幅切換信号bを、受信部６にローレベルの受信帯域
切換信号dをそれぞれ出力する(ステップ１０，１１)。On the other hand, when the ship speed s is smaller than the reference value u (s
Since <u) can be regarded as being in the state of the step (2) described above, the control processing unit 14 causes the transmission unit 4 to send the low-level transmission pulse width switching signal b and the reception unit 6 to the low-level reception band. The switching signals d are output respectively (steps 10 and 11).
【００３１】送信部４において、ローレベルの送信パル
ス幅切換信号bが入力されると、送信パルス幅変更手段
２０の他方のスイッチ２４2がオンし、これにより、送
信パルス発生回路１８には、コンデンサＣと抵抗Ｒ2が
接続されることになる。また、受信部６においては、ロ
ーレベルの受信帯域切換信号dが入力されると、受信帯
域変更手段３２の広帯域フィルタ３８2の前後のスイッ
チ３６2，４０2が共にオンする。In the transmitter 4, when the low level transmission pulse width switching signal b is input, the other switch 24 2 of the transmission pulse width changing means 20 is turned on, whereby the transmission pulse generating circuit 18 is The capacitor C and the resistor R 2 will be connected. In the receiving unit 6, when the low level reception band switching signal d is input, the switches 36 2 and 40 2 before and after the wide band filter 38 2 of the reception band changing unit 32 are both turned on.
【００３２】この状態で、次に、制御処理部１４は、送
信部４にキーイングパルスaを出力する(ステップ７)。
このキーイングパルスaに応答して、送信パルス発生回
路１８からは、コンデンサＣと抵抗Ｒ2によって決定さ
れる所定のパルス幅t2を有する送信パルスcが出力され
る。そして、この送信パルスcは、次段の発振出力回路
２２によって送受波器２と同じ共振周波数をもつ送信信
号eに変調されて出力され、この送信信号eが送受切換部
８を介して送受波器２に加わる。ここで、上記の送信パ
ルスcのパルス幅t2(＜t1)は、比較的短いために、分解
能が高く、精密な探知が可能となる。In this state, the control processor 14 then outputs the keying pulse a to the transmitter 4 (step 7).
In response to this keying pulse a, the transmission pulse generation circuit 18 outputs a transmission pulse c having a predetermined pulse width t 2 determined by the capacitor C and the resistor R 2 . Then, this transmission pulse c is modulated by the oscillation output circuit 22 of the next stage into a transmission signal e having the same resonance frequency as that of the wave transmitter / receiver 2 and output, and this transmission signal e is transmitted / received via the transmission / reception switching unit 8. Join the vessel 2. Here, since the pulse width t 2 (<t 1 ) of the above-mentioned transmission pulse c is relatively short, the resolution is high and precise detection is possible.
【００３３】送受波器２での超音波の送受波に基づいて
得られる受信信号iは、送受切換部８を介して受信部６
に入力される。この受信信号iは、前段増幅器３０、ス
イッチ３６2を順次介して広帯域フィルタ３８2に入力さ
れ、所定の帯域幅Δ2(２０ＫＨz)から外れる信号成分が
除かれる。つまり、船速sが基準値uよりも小さい場合(s
＜u)には、スクリュー音等の外来ノイズは少ないため、
受信帯域Δ2を広くすることで、分解能が高く、かつ、
広い周波数範囲に渡って受信信号iを捕捉できることな
る。そして、この広帯域フィルタ３８2を通過した受信
信号gは、スイッチ４０2、後段増幅器３４を介してＡ／
Ｄ変換器１０でデジタル化された後、制御処理部１４に
取り込まれる(ステップ８)。The reception signal i obtained based on the transmission / reception of ultrasonic waves in the transmitter / receiver 2 is transmitted via the transmission / reception switching unit 8 to the reception unit 6
Entered in. The received signal i is input to the wide band filter 38 2 via the pre-stage amplifier 30 and the switch 36 2 in order, and the signal component deviating from the predetermined bandwidth Δ 2 (20 KHz) is removed. That is, when the ship speed s is smaller than the reference value u (s
<U) has less external noise such as screw noise,
By widening the reception band Δ 2 , high resolution and
The received signal i can be captured over a wide frequency range. The received signal g that has passed through the wide band filter 38 2 is passed through the switch 40 2 and the post-stage amplifier 34 to A /
After being digitized by the D converter 10, it is loaded into the control processing unit 14 (step 8).
【００３４】このように、船速の大きさに応じて、送信
パルス幅変更手段２０が送受波器２に与える送信パルス
cのパルス幅をt1またはt2に変更すると同時に、受信帯
域変更手段３２が送受波器２で得られる受信信号の受信
帯域をΔ1またはΔ2に変更するので、常に、魚群を探
知、捕獲する各段階に応じて適切な探知情報を得ること
ができるようになる。As described above, the transmission pulse width changing means 20 gives the transmission pulse to the transducer 2 according to the speed of the ship.
At the same time as changing the pulse width of c to t 1 or t 2 , the receiving band changing means 32 changes the receiving band of the received signal obtained by the transducer 2 to Δ 1 or Δ 2 , so that the fish school is always detected. Appropriate detection information can be obtained according to each stage of capture.
【００３５】[0035]
【発明の効果】本発明によれば、船速の大きさに応じて
魚群探知機の送受波特性が自動的に変更されるため、魚
群を探知、捕獲する各段階に応じて適切な探知情報を得
ることが可能となる。また、その送受波特性の変更は自
動的であることから、変更操作の手間を省ける等の優れ
た効果を奏する。According to the present invention, since the transmission / reception characteristics of the fish finder are automatically changed according to the speed of the ship, it is possible to appropriately detect the fish flesh at each stage of detection and capture. It becomes possible to obtain information. Further, since the change of the transmission / reception characteristics is automatic, there is an excellent effect that the change operation can be saved.
【図１】本発明の実施例に係る魚群探知機の全体構成を
示すブロック図である。FIG. 1 is a block diagram showing an overall configuration of a fish finder according to an embodiment of the present invention.
【図２】図１の魚群探知機の受信部および受信部の各々
の詳細を示す構成図である。FIG. 2 is a configuration diagram showing details of a reception unit and a reception unit of the fish finder of FIG.
【図３】受信部に設定された受信信号の受信帯域の説明
図である。FIG. 3 is an explanatory diagram of a reception band of a reception signal set in a reception unit.
【図４】船速に応じて送受波特性を変更する場合の手順
を示すフローチャートである。FIG. 4 is a flowchart showing a procedure for changing a transmission / reception characteristic according to a ship speed.
【図５】図１および図２のブロック図の各部の出力信号
を示すタイムチャートである。5 is a time chart showing an output signal of each unit of the block diagrams of FIGS. 1 and 2. FIG.
１…魚群探知機、２…送受波器、４…送信部、６…受信
部、１２…船速検出手段(船速計)、２０…送信パルス幅
変更手段、３２…受信帯域変更手段。DESCRIPTION OF SYMBOLS 1 ... Fish finder, 2 ... Wave transmitter / receiver, 4 ... Transmission part, 6 ... Reception part, 12 ... Ship speed detection means (ship speed meter), 20 ... Transmission pulse width changing means, 32 ... Reception band changing means.
Claims (1)
送信パルスにパルス幅に対応した時間長さで超音波を送
波するとともに、探知物標から反射された超音波を受波
する送受波器を備えた魚群探知機において、 船速を検出する船速検出手段で検出された船速の大きさ
に応じて前記送受波器に与える送信パルスのパルス幅を
変更する送信パルス幅変更手段と、 前記速度検出手段で検出された船速の大きさに応じて送
受波器で得られる受信信号の受信帯域を変更する受信帯
域変更手段と、 を含むことを特徴とする魚群探知機。1. A transducer which is driven by a transmission pulse, which transmits an ultrasonic wave to the transmission pulse for a time length corresponding to a pulse width, and which receives an ultrasonic wave reflected from a detection target. In the fish finder provided with, transmission pulse width changing means for changing the pulse width of the transmission pulse given to the transducer according to the magnitude of the ship speed detected by the ship speed detecting means for detecting the ship speed, A fish band finder, comprising: a reception band changing unit that changes a reception band of a reception signal obtained by the transmitter / receiver according to the magnitude of the ship speed detected by the speed detecting unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04045441A JP3099034B2 (en) | 1992-03-03 | 1992-03-03 | Fish finder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04045441A JP3099034B2 (en) | 1992-03-03 | 1992-03-03 | Fish finder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05249240A true JPH05249240A (en) | 1993-09-28 |
| JP3099034B2 JP3099034B2 (en) | 2000-10-16 |
Family
ID=12719417
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04045441A Expired - Fee Related JP3099034B2 (en) | 1992-03-03 | 1992-03-03 | Fish finder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3099034B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000147118A (en) * | 1998-11-10 | 2000-05-26 | Kaijo Corp | Metering fish finder |
| JP2004184420A (en) * | 2002-12-05 | 2004-07-02 | Raymarine Ltd | Digital depth sounder module and detection method |
-
1992
- 1992-03-03 JP JP04045441A patent/JP3099034B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000147118A (en) * | 1998-11-10 | 2000-05-26 | Kaijo Corp | Metering fish finder |
| JP2004184420A (en) * | 2002-12-05 | 2004-07-02 | Raymarine Ltd | Digital depth sounder module and detection method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3099034B2 (en) | 2000-10-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5054361B2 (en) | Automatic adjustment of spectral Doppler gain in ultrasound systems | |
| US7245557B2 (en) | Sonar | |
| JPH08338870A (en) | Fish detector | |
| GB2379980A (en) | Underwater sounding apparatus with compensation for frequency shifts in different receiving directions and high signal to noise ratio | |
| JP3099034B2 (en) | Fish finder | |
| JPH11311672A (en) | Fish finder | |
| JPS62116254A (en) | Measuring method regarding partial slope of ultrasonic attenuation-frequency curve of propagation medium and devicethereof | |
| JP4796777B2 (en) | Underwater detector | |
| JPH1152048A (en) | Underwater detector | |
| JP2648605B2 (en) | Underwater detector | |
| JPH05180928A (en) | Underwater detecting device | |
| JP2002311129A (en) | Receiver circuit of underwater detection apparatus | |
| KR0119925B1 (en) | Measuring apparatus and method for distance by using ultra-sonic | |
| JP5023206B2 (en) | Underwater detector | |
| JP4547485B2 (en) | Fish finder | |
| JP3179749B2 (en) | Ultrasound diagnostic equipment | |
| JP2569582Y2 (en) | Ultrasound diagnostic equipment | |
| US6009044A (en) | Fish sonar | |
| JPH0772242A (en) | Active sonar apparatus | |
| JPH10123230A (en) | Static target of underwater sound | |
| JP2742947B2 (en) | Ultrasound blood flow imaging device | |
| KR0175781B1 (en) | Operation test device of passive dolly sound detector | |
| KR0119924B1 (en) | Measuring apparatus and method for distance by using ultra-sonic | |
| JPH0613503Y2 (en) | Underwater detector | |
| JP2004003940A (en) | Fish finder and method of detecting fish school |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |