JPS60155987A - Displaying method of fish finder - Google Patents

Abstract

PURPOSE:To enable immediate determination of a net towing course or the like after a finding while facilitating the operation of a ship by jointly indicating depth difference between the sea bottom and school of fish as distance from a wake of the ship. CONSTITUTION:A fish detection circuit [II] stores a reflection information signal based on the depth difference within a specified range including the sea bottom according to a control pulse P1 from a control signal generation circuit [ I ] into a memory 6. A control circuit 9 reads out the contents of the memory 6 in the order of a rising signal of the sea bottom B and reflected signals of fish F2 and F1. A track recorder [III] memorizes a new positional coordinate of a ship, the sea bottom and a fish signal with a memory of an arithmetic unit 14 based on a signal proportional to the azimuth thereof from a gyrocompass 11 and an output proportional to a running distance from a speedometer 12. A display circuit [V]indicates the position of own ship and the position of fish related thereto on a CRT18.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting and displaying fish schools that enables highly efficient and urgent tasks.

Recently, when catching schools of fish such as bottom-dwelling fish that do not move around infrequently, for example, while maneuvering the ship in a zigzag pattern at high speed across a large area of water, the fish finder is used to quickly grasp the situation below the ship, and then the net is cast. The method of operation is to determine a point or seine course. This method is particularly suitable for operations involving large vessels that are difficult to steer during trawling, and is also suitable for capturing schools of fish that are commonly distributed on slightly sloping seabed slopes and shallow channels on flat seabeds. It is said to be effective. By the way, in order to implement this method, it is necessary to be able to grasp the relative position between the ship and the school of detected fish in the direction of the sea surface. Only directional information can be obtained, and it is very difficult to implement such urgent methods as described above.

That is, in the vertical fish finding method, as shown in Figure 1, a sound wave C is emitted from the ship SHP in the vertical direction, and the sound waves C are emitted from the ship SHP, thereby detecting the seabed B and the fish school F.
This is in addition to a so-called pen-sweep type recording device in which recording paper is fed out in one direction, by capturing the reflected waves from +F2, etc., converting them into electrical signals, and recording them. Therefore, the information obtained thereby is only information in the direction of depth d with respect to the passage of time t related to the feeding speed of the recording paper. For example, as shown in Figure 2 G), I show the overall situation in the depth direction of the sea surface S, seabed B, fish school F1°F2, etc.
The record of the part II, and furthermore, the enlarged record near the seabed that shows the height of the fish school FI + F2 from the seabed B by fixing the seabed surface in a straight line regardless of the water depth,
Alternatively, as shown in Figure 2 (b), the seabed expansion record, which is a good way to understand the gentle slope of the seabed where many schools of fish live, channels, etc., is also written in part H, and in other words, the sending of the recording paper P. Depth d for the passage of time t related to the speed of
It is only a record of the direction. Therefore, no matter how much this record is expanded, it is impossible to know the distribution in the direction of the spread of the sea surface, which indicates the relationship between fish schools, submarine channels, and ships, obtained all at once over the sea area formed by the above-mentioned zigzag maneuver. I can't.

As a result, when deciding where to cast the net and what course to seine to catch schools of fish without leaving them behind, make assumptions based on the boat's speed and direction, taking into account previous experience. I have no choice but to. Furthermore, even if information in the direction of the spread of the sea surface, that is, on the X-Y plane, can be obtained by adding experience to this record,
The length of recording paper fed out per operation is considerable. For example, if the speed of the ship is 12 knots and the ship turns around in a zigzag pattern twice every two hours, the time required for the - times of detection will be eight hours. Therefore, if the feeding speed of the recording paper is set to 7 ICm as is commonly done, the length of the recording paper fed out will be as long as 5 m. As a result, it takes a lot of time to analyze it, and it is extremely difficult to quickly and accurately determine the casting net position, seine course, etc. so as not to let the fish schools escape. Therefore, although methods such as zigzag detection and seine netting enable efficient fishing by large vessels, it is not possible to achieve satisfactory results using the conventional vertical fish finder display method. It is no exaggeration.

The present invention makes it possible to directly and more accurately grasp the distribution of the detected fish school in the entire detection area in relation to the position of the ship, as well as the height of the fish school from the seabed, so that it is possible to immediately determine the seining course after detection. To provide a method for detecting and displaying fish that can determine the position of one's own boat while continuously checking the position of one's own boat while performing trawling, etc., and at the same time realizing the first low-cost fish detection method using the zigzag detection method, it can also be applied to the conventional vertical fish finding method. This makes it easier to maneuver the ship. Next, the present invention will be explained in detail using the drawings.

The gist of the present invention is as follows. i.e. azimuth determining device such as gyro compass and ship speed meter (log)
For example, as shown in Fig. 3 (a>
As shown in , the ship's current position SH, wake, etc., from the start of detection to the completion of the urgent mission are continuously drawn on the X-Y display plane of a cathode ray tube or the like. Meanwhile, at the same time, position coordinate signals detected moment by moment using information from the gyro compass of the track white drawing device and the ship's speedometer are used as shown in the partially enlarged views shown in Fig. 3 (a) and Fig. 3 (b). Then, using the wake line SHL as a reference, that is, the seabed surface B (fixed to the seabed regardless of water depth), the fish school signal F 1 + F2 r
Fla + Flb l Flc etc. are positioned on the X-Y display plane and displayed as a width t at a point of height h from the seabed, and an enlarged display similar to that shown in Fig. 2 (a) above in relation to the wake line SHL. be obtained. For example, as shown in Fig. 4, by aligning the position of the flat sea surface B' with the wake line SHL, we can display the fish school F1m l Flb l Fle and the dent B'' on the seabed, etc., in relation to the wake line SHL. It is possible to obtain an enlarged display similar to the recording of the section ``■'' in FIG. 2(b).

From the above, when detecting, seining, and casting nets, the positional relationship between your own ship and the school of fish on the X-Y plane, as well as the height relationship of the school of fish with respect to the seabed, and furthermore, by displaying them as shown in Figure 4. , the depth and distribution of the channel, the distribution range F of the fish school located here, the height from the seabed, etc. can be grasped directly and at once from the length t and height h. In this case, the height scale from the wake line is selected separately from the wake scale, so that the length can still be read from the wake scale, and the height can be adjusted without disturbing the positional relationship between the boat and the school of fish. The direction is enlarged (
For example, the ratio may be 1:100).

Next, based on the circuit diagram of an embodiment of the present invention shown in FIG. 5 and the operation waveform diagram shown in FIG. 6, FIGS. will be explained in detail.

In FIG. 5, [I] denotes a control signal generating circuit, which synchronously controls the fish detection circuit, the track whiteout circuit, and other circuits described below. [■] is a fish detection circuit, which is formed from the following parts. (1) is a transmitter, (2) is a transducer installed on the bottom of the ship, (3) is a receiver, (4) is a gate circuit,
(5) is a gate signal generation circuit, (6) is a memory device, (
7) is a write signal generation circuit, (8) is a submarine signal detection circuit, (9) is a read signal control circuit, and αQ is a read signal generation circuit, and each of the above parts operates as follows.

The transmitter (1) starts with the control pulse pt from the control signal generation circuit [1], and the pulse P2 sent out at each time interval TO causes the transducer (2) to emit a sound wave toward the seabed. receive the reflected wave. Receiver (3)
is the transmitted sound and sea surface reverberation S as shown in Figure 6 (→).

The reflected signals from the fish school Fl r F2, the seabed B, etc. are converted into electrical signals and applied to the gate circuit (4). The gate pulse generating circuit (5) receives the pulse P from the control signal generating circuit [I], starts rising at time tl with a delay of time TI from its generation, and selectively generates reflected waves in a required range including the seabed B. A gate signal P3 having a time width corresponding to T2 shown in FIG. and gate circuit (4
) to apply the reflected information signal to the memory device (6).

The memory device (6) stores the signals of the fish school F1+F2 and the rise signal (time tz) of the seabed B within the time width T2 corresponding to the required depth range from the seabed B, as shown in FIG. 6(c). It has a memory capacity necessary for the storage capacity, and the signals input through the gate circuit (4) are stored one after another by the write signal P4 from the write signal generation circuit (7), and the signals exceeding the memory capacity are caused to overflow.

As shown by the dotted line in FIG. 6(c), the seabed signal detection circuit (8) detects a level of - from the level of the fish school signals F1+F2.
EK y−C, +b7jf6 '+f* eIyua. 8
V < /l/ A: Separately, a signal P5 is sent out, which controls the write signal generation circuit (7) to stop sending out the write signal P4, and the memory device (6 ) is finally stored only the reflection signals of the fish school F1+F2 and the rising signal of the seabed B within the depth range, that is, within the time width T2.

As shown in FIG. 6(d), the read signal control circuit (9) rises after an appropriately set fixed time T3 from the rise of the output pulse PI from the control signal generation circuit [I]. The read signal generation circuit α0 is controlled by sending out a pulse P6 that continues for a time width T2. and a certain time T
3, the contents of the memory device (6) are read out in the order of the rising signal of the seabed B and the reflected signal of the fish school F 2 + F l, i.e., in the reverse order of the writing. are read from the memory device (6) in this order.

Next, [111] is a wake white drawing circuit, and [■] is a signal calculation circuit, which processes the information from the fish detection circuit [■] and the signal from the wake white drawing circuit. In the white trace circuit [■], α indicates a gyro compass, (6) indicates a ship speedometer, and α indicates a position coordinate calculation circuit. Further, in the signal calculation circuit [■], α is a signal calculation unit for cathode ray tube display, and each of the above-mentioned parts operates as follows.

The gyrocompass sends out a signal Sθ that is proportional to the ship's heading θ at every moment. The boat speed meter (2) sends out an output SR proportional to the traveling distance (stroke) every time the control signal P1 is sent from the control signal generating circuit [■]. Arithmetic unit o3
is the previous transmission time (time To
R cos θ, which is the X and Y components of the distance traveled up to the current transmission time.

RI+! +Iθ is calculated and each value is added to the coordinate signals xo, yo of the position before time To to calculate new position coordinates x, +Yl. The signal calculator α→ stores in its memory section, and each time a position coordinate signal is sent out by the calculator α, a new signal XI,
It is stored in memory with Y added. This operation is completed within time T3 in FIG. 6(d). - After the time T3 shown in FIG. 6(d) from the start of transmission control, the memory section of the force signal calculator α→ receives the signal P from the read signal generating circuit αQ.
The signal P7B synchronized with 7A is used as a write signal, and the read signal P7A is used as the read signal P7A to read data from the memory device (6) to the seabed B.

The signals read out in the order of fish school F2 + Fl are written in synchronization with the readout. In addition, at this time, the writing speed and therefore the reading speed from the memory device (6) are converted into a depth scale where the acquisition time T2 of seabed and fish school information is compared in a constant relationship with the distance scale of the cathode ray tube for displaying the track, which will be described later. , -x
2, that is, T2 (X1 to X2), and at the same time, the position of
Align it to the t position. From the above, the signal calculator α
The memory section of → is the new position coordinates X1 of the ship for each sound wave transmission.
r Yt and seafloor and fish school signals X1 to X2 related thereto and matched to the scale of the position coordinates are stored.

Next, (V) shows the display circuit, of which αQ is V −R
AM (Random Access Memory), αQ is its write signal generation circuit, α is its read signal generation circuit, a → is the cathode ray tube display device, α is the sweep signal generation circuit, (A) is the read signal of the signal calculator a → A generating circuit, wherein V −R
AM (formed from memory elements corresponding to the number of pixels in one cathode ray tube display device Q peak, and each of the above parts operates as follows. Readout signal generation circuit) is a readout signal generation circuit from one sweep signal generation circuit The read signal P13 is sent out under the control of the control signal P9, and the stored contents of the memory section 4 are read out to the signal calculator and added to the V-RAM (16).The write signal generation circuit (11 is a sweep signal generation circuit α) Write signal IPi is generated by write control signal P9 from Buddha.

The ship's coordinates X, , Yl, seabed B, and scorched fish school 2 + are read out from the memory section of the signal calculator ◇→.
The coordinates X1 to X2 of F1 signal P8 are stored in V-RAM (
Let lυ remember it. On the other hand, the readout signal generation circuit (1f) is controlled by the readout control signal pH from the sweep signal generation circuit α group, and in synchronization with the raster scanning of the cathode ray tube display device α, the contents of ■-RAM (r* A readout signal P12 to be read out is sent out, the resulting readout output is added to the cathode ray tube display device α→, and a signal calculator α→
Displays the own ship's position stored in , and the position of the school of fish associated with it. Then, the above operation is repeated for each successive transmission of sound waves, and the signal calculator α→ stores all the information from the start of detection to the completion, and the cathode ray tube display device α→ still displays this. do.

That is, in this example, the signal indicating the position of the ship is used as an address signal, and the rising signal of seabed B read out from the memory device (6) after a certain time delay from the generation of the rising signal of seabed B, and this. The signals of the associated fish schools F2 and Fl are written in relation to the scale of the cathode ray tube display θ bar, and then read out in synchronization with the scanning of the cathode ray tube display α→ and displayed on the cathode ray tube.

As a result, as shown in Figure 3, the wake SHL is drawn by the rising signal of the fixed seabed B, and the wake line S
Detection signals F1 and F2 of fish schools are drawn on a line indicating HL, that is, the seabed B, with an interval indicating the distance from the seabed. In addition, when schools of fish are distributed along channels on the ocean floor,
For example, as shown in Fig. 4, the fish school signal Fla + Fi
Since b + Flc is drawn, it can be seen that the fish are distributed along the channel as shown in F in the figure. Therefore, if the planned course SHL' for the 3rd X operation is written and displayed separately using a known method, it is possible to easily maneuver the vessel aiming for the school of fish F with the largest number while confirming the direction of operation based on the planned course SHL'. , the net can be dragged effectively without leaving behind schools of fish, and urgent tasks can be carried out efficiently.

The specific example of the method of the present invention has been described above with respect to the case where the seabed is fixed regardless of the water depth, but if you want to display the seabed depressions, soil quality, etc. along with schools of fish, the following can be done. For example, as shown in the waveform diagrams shown in FIGS. 8(a) and 8(b), the gate pulse generation circuit Q shown in FIG. 7 is provided, which sends out the pulse P14 with a time width T2 after a time delay of T4 from the time of transmission. As a result, the siggate circuit (4) is opened for the time width T2, and as shown in FIG. 8(C), the signals of the fish school FI+F2+bottom B are selectively passed through and added to the signal calculator a→. On the other hand, a write signal generation circuit (A) in FIG. 7, which is controlled by the output pulse P14 of the gate signal generation circuit H, is provided, and the wake white drawing circuit [l1l
) and the position coordinate signals X, , yt from the arithmetic unit (to) of The output calculated in the device α→ is written to the memory section of the signal calculator 0→. Then, in the same way as described above with reference to FIG. You can learn about the width and length of the river, soil quality, and even the distribution range of fish schools.

Although specific examples of the present invention have been described above, if it is desired to display tracks, depths of fish schools, etc. in different colors in order to facilitate identification of the display, a memory element with the number of bits required for displaying the information by oak can be used. It is sufficient to use a memory device (6) with a memory device (6), an internal memory device of the signal processor α-hiro, and a V-RAM (1→). It is possible to make the position easier to see by displaying it on a ship-shaped marker that has a different color from the wake line.

Furthermore, in the method of displaying a school of fish described above, when a ship navigates in the X direction or a direction close to this, the image of a school of fish will overlap on the wake line. This case can be prevented, for example, by adding or subtracting 90° to the output signal Sθ of the gyro compass α0. In addition, although the above description has mainly been given to the case of bottom trawling, it goes without saying that it can also be applied to intermediate trawling, two surface trawling, and purse seine fishing.

As is clear from the above explanation, according to the present invention, the position of the own ship, its wake, and the future position of fish schools, depressions on the seabed, etc. can be written on the X-Y plane by using the wake line as the seafloor line. It has the great advantage of being able to accomplish urgent needs at low cost by using large ships that detect schools of fish at high speed in a zigzag pattern and then lower their nets to capture schools of fish. Extremely large.

[Brief explanation of the drawing]

Figures 1 and 2 (a) and 2 (b) are the conventional vertical fish finding method and its recording areas, Figures 3 (a) and 4 are explanatory diagrams of the recording method of the present invention, and Figures 5 and FIG. 6 is a circuit diagram of an example of a device for implementing the method of the present invention and a waveform diagram for explaining its operation, and FIG. M7 and FIG. Illustrated. SHP...Ship, C...Sonic wave, B...Undersea, Fl
＋F2 Height, t...Fish school length, F...Fish school distribution, [I]...Control signal generation circuit, [■]...
・Fish detection circuit, (1)...transmitter, (2)...transducer, (3)...receiver, (4)...gate circuit,
(5)...Gate signal generation circuit, (6)...Memory device, (7)...Write signal generation circuit, (8)...
submarine signal detection circuit, (9)...readout signal control circuit,
α0... Readout signal generation circuit, [■]... Track white drawing circuit, α◇... Gyro compass, (6)... Vessel speed change course, α'3... Position coordinate calculation circuit, [■] ]...Signal calculation circuit, α→...Signal calculation unit, [■]...Display circuit, θ→...V-RAM, (10...Write signal generation circuit, α...Read signal generation Circuit, Q: CRT display device, α: Sweep signal generation circuit, K: Signal calculator readout signal generation circuit, Q]): Gate pulse generation circuit, (C): Writing Signal generation circuit. Patent applicant Kaiyo Denki Co., Ltd. agent Inuzuka 1 off-campus person Almost 1 figure, 2 figures (C1) (b) Congee 3 figure 4 figure Cheek 5 figure Kabuto 6 figure 13 Congee 8 figure

Claims (1)

[Claims] (1) Draw the ship's wake on the X=Y display screen, and
This wake is used as a reference line for the depth selected as appropriate, and the sea bottom L measured by the fish finder and the difference in depth of the school of fish from the reference water depth are also displayed on the side of the track as distances from the wake line. Fish detection display method.