JPH07198829A - Ultrasonic detection apparatus for removal of interference of a plurality of waves - Google Patents

Ultrasonic detection apparatus for removal of interference of a plurality of waves

Info

Publication number
JPH07198829A
JPH07198829A JP35259393A JP35259393A JPH07198829A JP H07198829 A JPH07198829 A JP H07198829A JP 35259393 A JP35259393 A JP 35259393A JP 35259393 A JP35259393 A JP 35259393A JP H07198829 A JPH07198829 A JP H07198829A
Authority
JP
Japan
Prior art keywords
detection
frequency
interference
signal
detection 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
Application number
JP35259393A
Other languages
Japanese (ja)
Inventor
Susumu Katayama
晋 片山
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.)
Koden Electronics Co Ltd
Original Assignee
Koden Electronics Co 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 Koden Electronics Co Ltd filed Critical Koden Electronics Co Ltd
Priority to JP35259393A priority Critical patent/JPH07198829A/en
Publication of JPH07198829A publication Critical patent/JPH07198829A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To obtain an ultrasonic detection apparatus which reduces an interference disturbance and whose detection capability is enhanced by alternately radating two ultrasonic waves whose propagation characteristic is similar and whose frequency is approximate to each other and a correlation-processing detection signals of their reflected waves. CONSTITUTION:A fish-detection control part 14 gives a driving signal at a first frequency to a transmitter 15 by a control signal, and, at the same time, it changes over the reception frequency of a receiver 16 to the first frequency. The receiver 16 starts to receive a detection signal at the first frequency, and it outputs the detection signal to an A-D conversion circuit 17. A buffer memory 18 starts to store a digitized detection signal. The transmitter 15 radiates the detection signal at the first frequency into water from a transmitter-receiver 13. Reflected waves from a group of fish 11 or the seabed 12 are digitized, and digitized reflected waves are stored in a memory 18. The detection signals of a many number of times which are to be displayed on a display device is stored in a memory 24 for a picture. A synchronizing signal is supplied to the display device 25 from a display control circuit 23, and display data in the display region part of the memory 24 is read out.

Description

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

【0001】[0001]

【産業上の利用分野】放射パルス信号の反射波を探知信
号として受信する超音波探知装置において、他船の魚群
探知機の放射パルス信号の反射波による干渉妨害を除去
する超音波探知装置に係わる。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic detecting device for receiving a reflected wave of a radiation pulse signal as a detection signal and removing interference interference caused by a reflected wave of the radiation pulse signal of a fish finder of another ship. .

【0002】[0002]

【従来の技術】近年、遠洋漁業は衰退し、沿岸漁業に移
行しており、特定の漁場に多くの漁船が密集する場合が
多い。多くの漁船が密集した状態で各船が魚群探知機を
使用した場合、他船の放射パルス信号の反射波も自船の
魚群探知機に受信されてしまういわゆる他船の魚群探知
機による干渉妨害がある。魚群探知機で使用される超音
波の周波数は主に15kHz〜200kHzであるが、
周波数によって海水中での伝ぱん特性は大きく異なる。
すなわち、200kHzでは伝ぱん距離は短いが探知の
分解能が良く、小さなターゲットでも探知できる。
2. Description of the Related Art In recent years, the pelagic fishery has declined and has shifted to coastal fishery, and many fishing boats are often concentrated in a specific fishing ground. When many fish boats are crowded and each boat uses a fish finder, the reflected wave of the radiation pulse signal of the other boat is also received by the fish finder of its own boat. There is. The frequency of ultrasonic waves used in fish finder is mainly 15kHz ~ 200kHz,
The propagation characteristics in seawater differ greatly depending on the frequency.
That is, at 200 kHz, the propagation distance is short, but the detection resolution is good, and even a small target can be detected.

【0003】一方、15kHzでは遠距離まで届くもの
の、ある程度大きなターゲットしか探知できないと云う
性質がある。従って、特定の漁場で特定の魚を探知する
場合には、その漁場深度と探知目的の魚の大きさや群れ
方等の性質により、探知に適した超音波周波数があり、
多くの漁船が密集して操業する場合は、各船同じ周波数
の魚群探知機を使用することになり、お互いに干渉妨害
が発生する。
On the other hand, at 15 kHz, although it reaches a long distance, it has a property that only a large target can be detected. Therefore, when detecting a specific fish in a specific fishing ground, there is an ultrasonic frequency suitable for detection, depending on the characteristics of the fishing ground depth and the size and flock of fish for the purpose of detection.
When many fishing boats operate densely, the fish finders of the same frequency are used on each boat, which causes interference with each other.

【0004】図2は他船の魚群探知機による干渉妨害が
ある場合の一般的な魚群探知機の表示例である。画面の
縦方向は距離、すなわち深度を表し、横方向は時間を表
している。1回の探知信号は1本の表示線1上に表して
いる。画面の右端に最新の探知信号を表示し、画面の順
次左に古い探知信号を表示する。画面左端に最も古い探
知信号を表示するようにしている。図2〜図5は、説明
を容易にするため模式図的に描かれている。信号強度を
表すのに線の太さを変えているが、実際の魚群探知機に
おいては、表示の色を変えたり、表示の濃淡を変えたり
して表示している。
FIG. 2 is a display example of a general fish finder when there is interference interference by a fish finder of another ship. The vertical direction of the screen represents distance, that is, depth, and the horizontal direction represents time. One detection signal is shown on one display line 1. The latest detection signal is displayed on the right edge of the screen, and the old detection signal is displayed sequentially on the left side of the screen. The oldest detection signal is displayed on the left edge of the screen. 2 to 5 are schematically drawn for ease of explanation. Although the thickness of the line is changed to represent the signal strength, in the actual fish finder, the color of the display is changed, or the shading of the display is changed.

【0005】図2は、超音波パルスを送波したときの信
号映像であり、2は発振線、3は探知した海底の映像、
4は魚群の映像を表し、5,6は他船の干渉妨害の映像
を表している。干渉妨害信号は、他船の探知送波パルス
信号が直接伝ぱんして来て妨害することは少ない。大部
分の干渉妨害信号は、他船が送波した放射パルス信号が
海底に当たり、その反射波として帰って来る海底の反射
信号が自船の魚群探知機に受信される探知信号である。
FIG. 2 is a signal image when an ultrasonic pulse is transmitted, 2 is an oscillation line, 3 is an image of the detected seabed,
Reference numeral 4 represents an image of a school of fish, and reference numerals 5 and 6 represent images of interference of other ships. The interfering signal is unlikely to be interfered by the direct detection and transmission pulse signal of another ship. Most of the interference jamming signals are detection signals that the radiation pulse signal transmitted by another ship hits the seabed, and the reflected signal of the seabed returning as a reflected wave is received by the fish finder of the ship.

【0006】他船と自船の魚群探知機の探知周期が全く
同じであれば、自船の魚群探知機で探知した映像と類似
の映像が異なる深度部分に表示されるが、通常は探知周
期が異なるため、海底映像が干渉妨害映像5,6のよう
に流れた形で表示される。
If the detection cycle of the fish finder of the other ship is exactly the same as the detection cycle of the fish finder of the own ship, an image similar to the image detected by the fish finder of the own ship is displayed at a different depth portion, but normally the detection cycle is Are different from each other, the submarine image is displayed in a flowing form like interference interference images 5 and 6.

【0007】干渉妨害映像6は、隣の表示線毎にわずか
しか深度方向にずれておらず比較的自船の魚群探知機と
の探知周期が近く、干渉妨害映像5は、隣の表示線毎に
映像が深度方向に大きくずれておりかなり自船との探知
周期が違うことを表している。
The interference disturbing image 6 is slightly deviated in the depth direction for each adjacent display line, and the detection cycle with the fish finder of the ship is relatively close, and the interference disturbing image 5 is for each adjacent display line. The image is greatly shifted in the depth direction, indicating that the detection cycle with the ship is quite different.

【0008】このような干渉妨害の除去は、隣接する探
知信号の相関性をみて相関性があれば自船の探知信号で
あり、相関性がなければ干渉妨害と判断して除去してい
る。すなわち、発振線2や海底3および魚群4をみる
と、隣接した探知表示線の映像は、若干の違いはあるも
のの大きな相違はない。一方、干渉妨害映像5では隣接
する表示線の同じ深度部分には、探知データがない。し
たがって干渉妨害映像5は隣接探知表示データ間に相関
がないので、図3に示すように除去することができる。
The interference is removed by judging the correlation between adjacent detection signals and if there is a correlation, it is the detection signal of the own ship, and if there is no correlation, it is determined as an interference and removed. That is, looking at the oscillation line 2, the seabed 3, and the school of fish 4, the images of the adjacent detection display lines are not so different although there are some differences. On the other hand, in the interference disturbance image 5, there is no detection data in the same depth portion of the adjacent display lines. Therefore, since the interference interference image 5 has no correlation between the adjacent detection display data, it can be removed as shown in FIG.

【0009】しかし、干渉妨害映像6については、隣接
表示線映像の同じ深度部分に重なった干渉妨害部分があ
り、この部分は相関性があるので一部分しか除去するこ
とができない。狭い漁場に多くの漁船が密集して操業す
る場合、各漁船の魚群探知機間で近接した探知周期の存
在は避けられず、干渉妨害映像は完全には除去できな
い。すなわち従来の1周波数の魚群探知機における干渉
除去を実施した映像例は、図3のようになる。
However, with respect to the interference disturbing image 6, there is an interference disturbing portion that overlaps the same depth portion of the adjacent display line image, and since this portion has a correlation, only a part can be removed. When many fishing boats operate densely in a narrow fishing ground, it is unavoidable that there are detection cycles close to each other between the fish finder of each fishing boat, and the interference and interference images cannot be completely removed. That is, an example of an image in which interference is removed by the conventional one-frequency fish finder is as shown in FIG.

【0010】[0010]

【発明が解決しようとする課題】放射パルス信号の周期
を異ならすことには、発射周期を短くする方法と、発射
周期を長くする方法とが考えられる。しかし、放射パル
ス信号の発射周期を短くする方法には、超音波の水中伝
ぱん速度の原理的限界と、水深の浅い場所では海面と海
底を2往復する多重反射の問題がある。一方放射パルス
信号の発射周期を長くする方法には、探知頻度の減少か
ら探知漏れが生じる問題がある。このように放射パルス
信号の発射周期を異ならすには限界があるので、多数の
漁船が狭い漁場に密集した場合には、何れかの漁船の探
知周期がほぼ同じになることが避けられない。このため
干渉除去が十分にできないことが多々あり問題となって
いる。多数の漁船が狭い漁場に密集して魚群探知機を使
用した場合でも、他船の放射パルスによる反射波の干渉
妨害を大幅に減少させるという課題がある。
To make the cycles of the radiation pulse signals different, there are a method of shortening the firing cycle and a method of lengthening the firing cycle. However, the method of shortening the emission period of the radiating pulse signal has the problems of the theoretical limit of the propagation speed of ultrasonic waves in the water and the multiple reflections that make two round trips between the sea surface and the seabed at a shallow water depth. On the other hand, the method of increasing the emission period of the radiation pulse signal has a problem that the detection frequency is reduced, resulting in detection omission. Since there is a limit to the difference in the emission cycle of the radiation pulse signal in this way, when a large number of fishing boats are crowded in a narrow fishing ground, it is inevitable that the detection period of any one of the fishing boats will be almost the same. Therefore, interference is often not sufficiently removed, which is a problem. Even when a large number of fishing boats are crowded in a narrow fishing ground and a fish finder is used, there is a problem that interference of reflected waves due to radiation pulses of other boats is significantly reduced.

【0011】[0011]

【課題を解決するための手段】伝ぱん特性が類似である
互いに近似の周波数の超音波を2周波用いて前記2周波
を交互に発射して、その反射波を探知信号として受信す
る。前記2周波の探知信号間の相関処理を行って干渉除
去を行う。
SOLUTION: The ultrasonic waves having similar frequencies to each other and having similar frequencies are used to alternately emit the two frequencies, and the reflected waves are received as a detection signal. Interference is removed by performing a correlation process between the detection signals of the two frequencies.

【0012】[0012]

【作用】前記2周波の内第1の周波数を使用する1回目
の探知信号において、前記第1の周波数と同じ周波数を
使用している他の漁船(a)の干渉妨害波が受信されて
も、2回目の探知信号では前記2周波の内の第2の周波
数を発射するので、他漁船(a)からの干渉妨害は受信
されない。
In the first detection signal using the first frequency of the two frequencies, even if an interference wave of another fishing boat (a) using the same frequency as the first frequency is received. Since the second detection signal emits the second frequency of the two frequencies, no interference from the other fishing boat (a) is received.

【0013】従って、前記第1の周波数と前記第2の周
波数のそれぞれの探知信号の相関処理によって他の漁船
(a)の干渉妨害は除去が可能となる。前記第2の周波
数で探知した場合に、別の他の漁船(b)による干渉妨
害が受信される場合もあるが、その場合には逆に前記第
1の周波数の発射時には他の漁船(b)からの干渉妨害
は受信されないので、他の漁船(a)と同様に干渉妨害
は除去できる。
Therefore, the interfering interference of the other fishing boat (a) can be eliminated by the correlation processing of the detection signals of the first frequency and the second frequency. In the case of detecting at the second frequency, there may be a case where interference with another fishing boat (b) is received, but in that case, conversely, when the first frequency is launched, another fishing boat (b) is received. No interference is received from the fishing boat (a), so that the interference can be eliminated as in the other fishing boat (a).

【0014】[0014]

【実施例】この発明の1実施例の構成を図1に示す。操
作キー19を操作することにより探知目的の深度範囲を
設定すると、CPU20を介してROM21の命令に従
い魚探制御部14に第1の周波数の制御信号が与えられ
る。魚探制御部14は、与えられた制御信号により送信
機15に第1の周波数の駆動信号を与えると同時に受信
機16の受信周波数を第1の周波数に切り換える。受信
機16は、第1の周波数の探知信号の受信を開始し、A
−D変換回路17に探知信号を出力する。バッファメモ
リ18は、デジタル化された第1の周波数の探知信号の
記憶を開始する。送信機15は、第1の周波数のパルス
信号を作成し電力増幅して送受波器13から超音波パル
ス信号を水中に放射する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction of one embodiment of the present invention is shown in FIG. When the detection target depth range is set by operating the operation keys 19, a control signal of the first frequency is given to the fish finder control unit 14 via the CPU 20 in accordance with an instruction from the ROM 21. The fish finder control unit 14 switches the reception frequency of the receiver 16 to the first frequency at the same time as supplying the drive signal of the first frequency to the transmitter 15 by the supplied control signal. The receiver 16 starts receiving the detection signal of the first frequency,
The detection signal is output to the -D conversion circuit 17. The buffer memory 18 starts storing the digitized detection signal of the first frequency. The transmitter 15 creates a pulse signal of the first frequency, amplifies the power, and radiates an ultrasonic pulse signal into the water from the transducer 13.

【0015】放射された超音波パルス信号は、魚群11
や海底12によって反射され、反射波が帰来する。前記
反射波は、送受波器13で受波され電気信号に変換され
た後探知信号として受信機16で増幅される。受信機1
6の出力は、A−D変換回路17でディジタル化したあ
とバッファメモリ18に記憶される。バッファメモリ1
8は、例えばデジタル化された探知信号のレベルを16
段階に深度方向の距離を480に区分して記憶する。バ
ッファメモリ18に記憶された1回の探知信号は、次回
の探知を行う前に表示制御回路23(市販のグラフィッ
クプロセッサ素子μPD72123(NEC製)などに
より構成される。)を介して映像用メモリ24に転送さ
れる。映像用メモリ24(表示データ領域より広いデー
タ記憶領域を持つ)には、表示器25に表示するための
多数回の探知信号が記憶される。映像用メモリ24に記
憶された多数回の探知信号を表示器25のどの部分にど
のような形と色で表示するかは、表示制御回路23にC
PU20を介して制御信号を与えることにより行う。表
示器25に表示される探知信号は、映像用メモリ24の
表示用領域に表示データとして作成される。表示制御回
路23からは表示器25へ同期信号が供給され、映像用
メモリ24の表示領域部分の前記表示データが前記同期
信号により繰り返し連続的に読み出されて表示器25に
表示される。
The radiated ultrasonic pulse signal is transmitted to the fish school 11
It is reflected by the seabed 12 and the reflected wave returns. The reflected wave is received by the wave transmitter / receiver 13, converted into an electric signal, and then amplified by the receiver 16 as a detection signal. Receiver 1
The output of 6 is digitized by the AD conversion circuit 17 and then stored in the buffer memory 18. Buffer memory 1
8 indicates, for example, the digitized detection signal level 16
The distance in the depth direction is divided into 480 and stored. The one-time detection signal stored in the buffer memory 18 is passed through the display control circuit 23 (composed of a commercially available graphic processor element μPD72123 (manufactured by NEC) or the like) before the next detection, and the image memory 24 is obtained. Transferred to. The video memory 24 (having a data storage area wider than the display data area) stores a large number of detection signals to be displayed on the display 25. The display control circuit 23 determines which part of the display 25 and in what shape and color the detection signal stored in the video memory 24 is displayed.
This is performed by giving a control signal via the PU 20. The detection signal displayed on the display 25 is created as display data in the display area of the video memory 24. A synchronization signal is supplied from the display control circuit 23 to the display device 25, and the display data in the display area portion of the video memory 24 is repeatedly and continuously read by the synchronization signal and displayed on the display device 25.

【0016】図7(a)は、第1の周波数を放射した時
のバッファメモリ18の記憶期間を示している。図7
(b)は、第1の周波数を放射した時の受信機16の探
知信号を示している。図7(a)の期間に図7(b)の
探知信号をバッファメモリ18に記憶する。バッファメ
モリ18に記憶した第1の周波数の探知信号は、バッフ
ァメモリ18への記憶終了後の図7(c)の期間に表示
制御回路23を介して映像用メモリ24に転送される。
図7(c)の期間は、最小限バッファメモリ18の探知
信号を映像用メモリ24へ転送する時間必要である。図
7(c)の期間を利用して放射パルス信号の発射周期を
異ならすことができる。
FIG. 7A shows the storage period of the buffer memory 18 when the first frequency is radiated. Figure 7
(B) has shown the detection signal of the receiver 16 when radiating a 1st frequency. The detection signal of FIG. 7B is stored in the buffer memory 18 during the period of FIG. The detection signal of the first frequency stored in the buffer memory 18 is transferred to the video memory 24 via the display control circuit 23 during the period shown in FIG. 7C after the storage in the buffer memory 18 is completed.
The period shown in FIG. 7C requires a minimum time to transfer the detection signal from the buffer memory 18 to the video memory 24. The emission cycle of the radiation pulse signal can be made different by utilizing the period of FIG. 7 (c).

【0017】第1の周波数による探知信号を映像用メモ
リ24に転送後、すなわち図7(c)の期間終了後CP
U20を介してROM21の命令に従い魚探制御部14
に第2の周波数の制御信号が与えられる。同時に受信機
16の受信周波数を第2の周波数に切り換える。以後の
送信および受信動作は、前記第1の周波数のときの送信
および受信動作と同様である。図7(d)の期間に図7
(e)の第2の周波数による探知信号をバッファメモリ
18に記憶する。バッファメモリ18に記憶した第2の
周波数の探知信号は、図7(f)の期間に表示制御回路
23を介して、映像用メモリ24に転送される。 図7
(f)の期間は、最小限バッファメモリ18の探知信号
を映像用メモリ24へ転送する時間必要である。図7
(f)の期間を利用して放射パルス信号の発射周期を異
ならすことができる。
After the detection signal of the first frequency is transferred to the image memory 24, that is, after the period of FIG.
The fish finder control unit 14 according to the instruction of the ROM 21 via U20
To the control signal of the second frequency. At the same time, the reception frequency of the receiver 16 is switched to the second frequency. Subsequent transmission and reception operations are similar to the transmission and reception operations at the first frequency. During the period of FIG.
The detection signal at the second frequency (e) is stored in the buffer memory 18. The detection signal of the second frequency stored in the buffer memory 18 is transferred to the video memory 24 via the display control circuit 23 during the period shown in FIG. Figure 7
The period (f) requires a minimum time for transferring the detection signal from the buffer memory 18 to the video memory 24. Figure 7
The period of (f) can be used to change the emission cycle of the radiation pulse signal.

【0018】図6は、この発明の他の実施例の構成図で
ある。受信機16,A−D変換器17、バッファメモリ
18をそれぞれ2つ設け、第1の周波数の受信中に第2
の周波数の受信が同時にできるようにしている。図9は
図6の構成による第1の周波数と第2の周波数の探知信
号のバッファメモリ18への記憶と映像用メモリ24へ
の転送の時間関係を示している。図9(a)は、第1の
周波数を放射した時のバッファメモリ18の記憶期間を
示している。図9(b)は、第1の周波数を放射した時
の受信機16の探知信号を示している。図9(a)の期
間に図9(b)の探知信号をA−D変換器17でデジタ
ル信号に変換してバッファメモリ18に記憶する。バッ
ファメモリ18に記憶した第1の周波数の探知信号は、
バッファメモリ18への記憶終了後の図9(c)の期間
に表示制御回路23を介して映像用メモリ24に転送さ
れる。第2の周波数は、第1の周波数の探知信号の映像
用メモリ24への転送をまたずにCPU20を介してR
OM21の命令に従い魚探制御部14に第2の周波数の
制御信号が与えられ魚探制御部14が与えられた制御信
号により送信機15に第2の周波数の駆動信号を与える
ことにより水中に放射される。図9(d)は、第2の周
波数を放射した時のバッファメモリ18bの記憶期間を
示している。図9(e)は、第2の周波数を放射した時
の受信機16bの探知信号を示している。図9(d)の
期間に図9(e)の探知信号をA−D変換器17bでデ
ジタル信号に変換してバッファメモリ18bに記憶す
る。バッファメモリ18bに記憶した第2の周波数の探
知信号は、バッファメモリ18bへの記憶終了後の図9
(f)の期間に表示制御回路23を介して映像用メモリ
24に転送される。
FIG. 6 is a block diagram of another embodiment of the present invention. Two receivers 16, two A / D converters 17, and two buffer memories 18 are provided to allow the second frequency during the reception of the first frequency.
It is possible to receive at the same frequency. FIG. 9 shows a time relationship between storage of the detection signals of the first frequency and the second frequency in the buffer memory 18 and transfer to the video memory 24 according to the configuration of FIG. FIG. 9A shows the storage period of the buffer memory 18 when the first frequency is radiated. FIG. 9B shows the detection signal of the receiver 16 when the first frequency is radiated. During the period shown in FIG. 9A, the detection signal shown in FIG. 9B is converted into a digital signal by the AD converter 17 and stored in the buffer memory 18. The detection signal of the first frequency stored in the buffer memory 18 is
In the period shown in FIG. 9C after the storage in the buffer memory 18, the data is transferred to the video memory 24 via the display control circuit 23. The second frequency is R through the CPU 20 without transferring the detection signal of the first frequency to the video memory 24.
According to a command from the OM 21, the fish finder control unit 14 is given a control signal of the second frequency, and the fish finder control unit 14 gives a transmitter 15 a drive signal of the second frequency according to the given control signal so that the transmitter 15 is radiated into the water. . FIG. 9D shows the storage period of the buffer memory 18b when the second frequency is radiated. FIG.9 (e) has shown the detection signal of the receiver 16b when radiating a 2nd frequency. In the period of FIG. 9D, the detection signal of FIG. 9E is converted into a digital signal by the AD converter 17b and stored in the buffer memory 18b. The detection signal of the second frequency stored in the buffer memory 18b is shown in FIG. 9 after the end of storage in the buffer memory 18b.
It is transferred to the video memory 24 via the display control circuit 23 in the period (f).

【0019】干渉妨害除去映像は、映像用メモリ24に
記憶された多数回の探知信号を、表示制御回路23にC
PU20を介して制御信号を与え、映像用メモリ24の
表示用領域に表示データとして作成するときに前回探知
信号と今回探知信号との相関をとりながら前記表示用領
域に表示データとして作成される。前回探知信号と今回
探知信号は、例えば同じ深度での探知信号レベルが一定
量のレベル差(例えば16段階レベルの内±4レベル以
内)であれば相関性があると見なす。前記相関性がある
と見なした探知信号を表示データとして抽出する。
In the interference and interference elimination image, the detection signal stored in the image memory 24 a number of times is sent to the display control circuit 23 as a C signal.
When a control signal is given via the PU 20 and is created as display data in the display area of the video memory 24, it is created as display data in the display area while correlating the previous detection signal and the current detection signal. For example, if the detection signal level at the same depth has a certain level difference (for example, within ± 4 levels out of 16 levels), the previous detection signal and the current detection signal are considered to be correlated. The detection signal regarded as having the correlation is extracted as display data.

【0020】図8は、干渉除去の様子を示す図である。
映像用メモリ24に記憶された多数回の探知信号の内の
前回探知信号図8(a)と今回探知信号図8(b)共に
発振線2bと魚群4bおよび海底3bには相関性がある
ので表示データとして抽出されるが、今回探知信号図8
(b)の干渉妨害信号5bに相当する信号が前回探知信
号図8(a)にはないので、干渉妨害信号5bには相関
性がなく、干渉妨害信号5bは除去されて、表示データ
図8(c)が作成される。
FIG. 8 is a diagram showing how interference is removed.
Of the many detection signals stored in the video memory 24, the previous detection signal FIG. 8 (a) and the current detection signal FIG. 8 (b) have a correlation between the oscillation line 2b, the school of fish 4b and the seabed 3b. It is extracted as display data, but this time detection signal Fig. 8
Since the signal corresponding to the interference disturbing signal 5b of (b) is not present in the previous detection signal FIG. 8 (a), the interference disturbing signal 5b has no correlation, and the interference disturbing signal 5b is removed, so that the display data shown in FIG. (C) is created.

【0021】干渉妨害処理は、映像用メモリ24に転送
する際に記憶した前回探知信号と今回探知信号の2回の
探知信号の相関処理を行いながら1ビットずつ処理と転
送を実行することもできる。また、干渉妨害処理は、2
回の探知が終了してから距離(深度)対応のサンプリン
グビット毎に行ってもよいが、今回の探知信号を順次距
離(深度)に対応してサンプリングして取り込む際に、
バッファメモリ18に記憶されている同じ距離(深度)
の前回探知信号との相関性の有無を調べながら、探知信
号の記憶をすることもできる。
In the interference and interference processing, it is also possible to execute the processing and the transfer one bit at a time while performing the correlation processing of the two detection signals of the previous detection signal and the current detection signal stored at the time of transferring to the video memory 24. . In addition, interference interference processing is 2
It may be performed for each sampling bit corresponding to the distance (depth) after the detection of the number of times is completed, but when sampling and capturing the detection signal of this time sequentially corresponding to the distance (depth),
Same distance (depth) stored in the buffer memory 18
It is also possible to store the detection signal while checking for correlation with the previous detection signal of.

【0022】この手順を図10のフローチャートに示
す。まず、P1でバッファメモリ18から前回探知信号
の1ビット目(最も近距離の信号)を読み出す。次にP
2,P3で今回探知のサンプリングのタイミングが来る
まで待機し、サンプリングのタイミングが来ればP4で
今回の1ビット目の探知信号としてデータを取り込む。
取り込んだ今回探知信号を、P5で前回の1ビット目と
して読みだしたアドレス部分に前回データに置き替えて
記憶する。P6で前回探知信号と今回探知信号のレベル
を比較演算する。P7で比較演算結果が±4以内であれ
ば、P8で今回のサンプリング探知信号を採用して、P
9で干渉妨害除去データを記憶する。P7の判定で比較
演算結果が±4を越えていれば、P12でゼロレベルす
なわち無信号レベルを採用して、P9で干渉妨害除去デ
ータとして記憶する。続いてP10で距離方向の次のビ
ット処理に移るために距離ビットアドレスを+1する。
P11で距離ビットが480に達したかの判定をし、達
するまで同じ処理を繰り返す。
This procedure is shown in the flowchart of FIG. First, at P1, the first bit (the closest signal) of the previous detection signal is read from the buffer memory 18. Then P
At 2 and P3, the process waits until the sampling timing of the current detection comes, and when the sampling timing comes, at P4, data is taken in as the detection signal of the first bit of this time.
The captured current detection signal is replaced with the previous data and stored in the address portion read as the first bit of the previous time in P5. In P6, the levels of the previous detection signal and the current detection signal are compared and calculated. If the comparison calculation result is within ± 4 in P7, the current sampling detection signal is adopted in P8, and P
At 9, the interference elimination data is stored. If the comparison calculation result exceeds ± 4 in P7, a zero level, that is, no signal level is adopted in P12 and stored as interference interference removal data in P9. Subsequently, at P10, the distance bit address is incremented by 1 to move to the next bit processing in the distance direction.
In P11, it is determined whether the distance bit has reached 480, and the same processing is repeated until the distance bit is reached.

【0023】干渉妨害の発生確率をさらに低くするに
は、隣接した探知信号間の相関だけではなく、前後3回
の探知信号間の相関処理や3周波数を順次切換えて探知
するなどによって容易に実現できることは云うまでもな
い。
To further reduce the probability of occurrence of interference, not only the correlation between the adjacent detection signals, but also the correlation processing between the detection signals three times before and after and the detection by sequentially switching three frequencies are realized. It goes without saying that you can do it.

【0024】[0024]

【発明の効果】この発明の魚群探知機では、超音波の伝
ぱん特性が同様の近傍の複数波、例えば2周波を交互に
切換えて探知する。このことにより図2に示す干渉妨害
映像は、干渉妨害となる他船の魚群探知機とは1回毎に
周波数が異なるため、図5に示すように1回おきの干渉
妨害が受信される。さらに、第2の周波数で探知した時
に、図2の干渉妨害とは別の、第2の周波数を用いてい
る別の他の船の干渉妨害7が新たに受信されるが、同様
に1回おきに受信される。
According to the fish finder of the present invention, a plurality of adjacent waves having similar ultrasonic wave propagation characteristics, for example, two frequencies are alternately switched and detected. As a result, the interference jamming image shown in FIG. 2 has a frequency different from that of the fish finder of the other ship that causes interference, and therefore the interference jamming is received every other time as shown in FIG. Further, when detecting at the second frequency, interference interference 7 of another ship using the second frequency, which is different from the interference interference of FIG. 2, is newly received. Received every second.

【0025】図4での干渉妨害信号は、たとえ自船と全
く同じ探知周期であつても1回おきに受信されるため、
隣接した探知表示線間での相関性はなく、図5に示すよ
うに干渉妨害映像を除去することができる。このように
複数波を順次切換えて探知する場合、1つの周波数に着
目すると送波探知周期が長くなるので、他船へ与える干
渉妨害も大幅に減少する効果がある。
The interfering signal in FIG. 4 is received every other time even if the detection cycle is exactly the same as that of the own ship.
There is no correlation between the adjacent detection display lines, and the interference image can be removed as shown in FIG. In this way, when a plurality of waves are sequentially switched and detected, when one frequency is focused, the transmission detection cycle becomes long, so that there is an effect of greatly reducing interference and interference given to other ships.

【0026】複数の周波数を用いて探知する場合で、図
6のように受信系統を2つ設けた場合は、第1の周波数
と第2の周波数をオーバラップして探知することができ
るので、他船の魚群探知機と異なる周期にできる範囲が
広がり、干渉妨害除去率の向上ができると共に、探知の
頻度が多くなるので、探知漏れの減少にも効果がある。
In the case of detecting using a plurality of frequencies, if two receiving systems are provided as shown in FIG. 6, the first frequency and the second frequency can be detected in an overlapping manner. The range in which a cycle different from that of the fish finder of another ship can be widened, the interference rejection ratio can be improved, and the frequency of detection increases, which is also effective in reducing detection omissions.

【0027】現状では、近距離において操業する漁船の
魚群探知機間の干渉妨害があり、一部では最適探知周波
数外の魚群探知機を使用したり、超音波探知出力を大き
くするなども行われている。これらは探知能力の低下や
投資増になり、操業効率の低下につながるが、この発明
の複数波干渉除去探知装置によれば、他船の魚群探知機
の探知周波数が1つの場合、たとえ探知周期が同じでも
干渉妨害を除去することができ、また自船の探知周期
は、1つの周波数に着目すると複数倍と長くなるので、
他船へ与える干渉妨害も大幅に減少する。このため自船
および他船を含めての探知能力の向上、操業効率の向上
ができる。
At present, there is interference between the fish finder of a fishing boat operating in a short distance, and in some cases, a fish finder outside the optimum detection frequency is used or the ultrasonic detection output is increased. ing. These reduce the detection ability and increase the investment, leading to a decrease in operation efficiency. According to the multiple wave interference elimination detection device of the present invention, even when the detection frequency of the fish finder of another ship is one, even if the detection cycle is Even if they are the same, it is possible to remove interference, and the detection period of your ship will be several times longer if you focus on one frequency.
Interference and interference with other ships will be greatly reduced. Therefore, it is possible to improve the detection ability of the own ship and other ships and improve the operation efficiency.

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

【図1】この発明の実施例の構成図FIG. 1 is a configuration diagram of an embodiment of the present invention.

【図2】干渉妨害のある魚群探知機の映像表示例[Figure 2] Video display example of a fish finder with interference

【図3】従来の干渉除去を行った映像表示例[Fig. 3] Example of image display with conventional interference removal

【図4】この発明による干渉除去を行わない場合の映像
表示例
FIG. 4 is a video display example when interference removal according to the present invention is not performed.

【図5】この発明による干渉除去を行なった場合の映像
表示例
FIG. 5 is an image display example when interference is removed according to the present invention.

【図6】この発明の他の実施例の構成図FIG. 6 is a block diagram of another embodiment of the present invention.

【図7】探知信号の記憶時間の関係を示す波形図FIG. 7 is a waveform chart showing the relationship between detection signal storage times.

【図8】干渉除去説明のための波形図FIG. 8 is a waveform diagram for explaining interference removal.

【図9】この発明の他の実施例の探知信号の記憶時間の
関係を示す波形図
FIG. 9 is a waveform chart showing the relationship of the detection signal storage time according to another embodiment of the present invention.

【図10】干渉除去のフローチャートFIG. 10 is a flowchart of interference removal.

【符号の説明】[Explanation of symbols]

1・・・・表示線 2・・・・発振線映像 2b・・・発振線信号、 3・・・・海底映像 3b・・・海底信号 4・・・・魚群映像 4b・・・魚群信号 5・・・・干渉妨害映像 5b・・・干渉妨害信号 6・・・・干渉妨害映像 7・・・・干渉妨害映像 11・・・魚群 12・・・海底 14・・・魚探制御部 15・・・送信機 16・・・受信機 16b・・受信機 17・・・A−D変換回路 17b・・A−D変換回路 18・・・バッファメモリ 18b・・バッファメモリ 19・・・操作キー 20・・・CPU 21・・・ROM 22・・・RAM 23・・・表示制御回路 24・・・映像用メモリ、 25・・・表示器 1 ... Display line 2 ... Oscillation line image 2b ... Oscillation line signal 3 ... Submarine image 3b ... Submarine signal 4 ... Fish school image 4b ... Fish school signal 5・ ・ ・ ・ Interference interference image 5b ・ ・ ・ Interference interference signal 6 ・ ・ ・ ・ Interference interference image 7 ・ ・ ・ ・ Interference interference image 11 ・ ・ ・ Fish school 12 ・ ・ ・ Seabed 14 ・ ・ ・ Fish finder control unit 15 ・ ・-Transmitter 16 ... Receiver 16b ... Receiver 17 ... A-D conversion circuit 17b ... A-D conversion circuit 18 ... Buffer memory 18b ... Buffer memory 19 ... Operation key 20 ... ..CPU 21 ... ROM 22 ... RAM 23 ... Display control circuit 24 ... Video memory 25 ... Display

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 パルス信号波を繰り返し放射し、それら
の反射信号を受信して探知信号を得、1回の探知信号を
1本の表示線として表示器に表示し、多数回の探知信号
を古い順に配列して面表示とする超音波探知装置におい
て、 伝ぱん特性が類似である互いに近似の複数の周波数を順
次に切換えて放射して受信して記憶する手段と、 連続した探知順の複数回の探知信号の同じ探知距離の探
知信号間の相関を取る手段と、 相関性がある前記複数回の探知信号を表示データとして
抽出する手段とを具備したことを特徴とする複数波干渉
除去超音波探知装置。
1. A pulse signal wave is repeatedly radiated, a reflected signal thereof is received to obtain a detection signal, and one detection signal is displayed as one display line on a display unit to detect a large number of detection signals. In an ultrasonic detection device that is arranged in the old order to provide a plane display, a means for sequentially switching and radiating and receiving a plurality of frequencies that are similar to each other and having similar propagation characteristics, and storing a plurality of consecutive detection orders. A multi-wave interference canceller, characterized by comprising means for obtaining correlation between detection signals of the same detection distance of detection signals of one time, and means for extracting the detection signals of the plurality of times having correlation with each other as display data. Sound wave detection device.
JP35259393A 1993-12-29 1993-12-29 Ultrasonic detection apparatus for removal of interference of a plurality of waves Pending JPH07198829A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP35259393A JPH07198829A (en) 1993-12-29 1993-12-29 Ultrasonic detection apparatus for removal of interference of a plurality of waves

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP35259393A JPH07198829A (en) 1993-12-29 1993-12-29 Ultrasonic detection apparatus for removal of interference of a plurality of waves

Publications (1)

Publication Number Publication Date
JPH07198829A true JPH07198829A (en) 1995-08-01

Family

ID=18425112

Family Applications (1)

Application Number Title Priority Date Filing Date
JP35259393A Pending JPH07198829A (en) 1993-12-29 1993-12-29 Ultrasonic detection apparatus for removal of interference of a plurality of waves

Country Status (1)

Country Link
JP (1) JPH07198829A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006058108A (en) * 2004-08-19 2006-03-02 Nec Corp Multibeam sonar and its signal processing method
JP2011033561A (en) * 2009-08-05 2011-02-17 Furuno Electric Co Ltd Underwater detection device
JP2011516848A (en) * 2008-04-04 2011-05-26 エリプティック ラボラトリーズ エーエス Estimating the position of objects in various ranges
JP2011237180A (en) * 2010-05-06 2011-11-24 Furuno Electric Co Ltd Detection device
JP2021113725A (en) * 2020-01-17 2021-08-05 株式会社Soken Object detection device and object detection program

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006058108A (en) * 2004-08-19 2006-03-02 Nec Corp Multibeam sonar and its signal processing method
JP2011516848A (en) * 2008-04-04 2011-05-26 エリプティック ラボラトリーズ エーエス Estimating the position of objects in various ranges
JP2011033561A (en) * 2009-08-05 2011-02-17 Furuno Electric Co Ltd Underwater detection device
JP2011237180A (en) * 2010-05-06 2011-11-24 Furuno Electric Co Ltd Detection device
JP2021113725A (en) * 2020-01-17 2021-08-05 株式会社Soken Object detection device and object detection program

Similar Documents

Publication Publication Date Title
JP5658871B2 (en) Signal processing apparatus, radar apparatus, signal processing program, and signal processing method
JP5383374B2 (en) Underwater detector
US11320534B2 (en) Ultrasonic detecting device and ultrasonic detecting method
JP2014002084A (en) Underwater detection device, underwater display system, program and underwater display method
JP6339446B2 (en) Detection device, detection method, and program
JP4354736B2 (en) Ultrasonic transceiver
JPH07198829A (en) Ultrasonic detection apparatus for removal of interference of a plurality of waves
JP6393585B2 (en) Underground radar equipment
JP5259076B2 (en) Ultrasonic transceiver and scanning sonar
JP7262289B2 (en) DETECTION DEVICE, DETECTION METHOD, AND PROGRAM
JPH01118791A (en) Signal processor of ultrasonic sonar
US4653032A (en) Arrangement for the determination of the direction and/or distance of objects by means of water-borne sound waves
JP2010066128A (en) Fish finder
JP6757083B2 (en) Echo sounder and multi-beam echo sounder
JPS6044627B2 (en) Scanning sonar signal processing method
JP5603355B2 (en) Ultrasonic measuring device
JP2009294119A (en) Fish finder
JPH0448192B2 (en)
JP2599009B2 (en) Ultrasonic transmission / reception method
JP3285216B2 (en) Fish finder
JPH07110372A (en) Multiple reflection false image removing apparatus
JPS58198775A (en) Display device of sonar
JPH0427510B2 (en)
JPH0148517B2 (en)
JPS63187178A (en) Display device for object on or in water