JPS602634B2 - Fishing net shape display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses sonar (horizontal fish finder), silk depth meter, and radar information to image the position and shape of the submerged portion of the fishing net, as well as the shape of the silk on the water, and to image schools of fish, etc. The present invention relates to a device for displaying images at the same time.

Conventionally, in the silk fishing method, a school of fish is first discovered using a sonar (horizontal fish finder), etc., and silk is then spread around the school of fish, taking into account the swimming direction of the school of fish, the flow of the tide, etc.

At this time, it is necessary to wait until the bottom end of the silk reaches a position deeper than the position of the fish school before inserting the bottom end of the silk. The state of the net's sedimentation is checked by recording the net depth information sent from the attached net depth meter to the boat by wire or wirelessly (ultrasonic signals) on the recording paper of the fish finder. However, with this method, although it is possible to accurately determine the depth of the bottom of the fishing net, there is no information to know the extent of the silk, which constantly changes shape due to the current. ) is unknown. Therefore, the subordinate sowed the net based on the intuition and experience of the fishing master, who said, ``If we take the current into account, the underwater net will probably look like this.'' The shape of the float was used to determine the quality of silk in the water. However, especially when the direction of the current is different between the upper and lower layers, the shape of the top of the silk as seen from the float and the position and shape of the silk in the water will be significantly different. Furthermore, even when there is wind, the floats move due to the wind, which poses operational difficulties, unlike floating silk floats underwater. - Generally used net depth gauges use pressure sensors to convert voltage or resistance values that change depending on water pressure into appropriate frequencies or pulse trains,
A method is used to know the water depth by transmitting information on board the ship.

The transmission method is such that the waves are sent from the net depth meter side toward the ship in the negative direction, and on the ship side, the waves are received by a receiver that only has a receiver housing. The present invention combines a plurality of silk depth gauges with a transponder function in addition to the function of transmitting only the depth information of the bottom end of the net to the ship as a net depth meter, and a sonar to obtain information on the formation of silk in the water. The silk on the top of the silk, which can be seen as an echo from the float, is also displayed on the display of the sonar device at the same time as images of schools of fish, etc., and will be explained in detail below with reference to the drawings. FIG. 1 is a diagram for explaining a method of detecting underwater net formation as part of an embodiment of the present invention, in which tl is an ultrasonic transducer, 2 is a sonar device (underwater fish finder), and 3 is a winder. In the silk fishing net, 4, 4', and 4'' indicate silk depth gauges when three transponder type net depth gauges are used, and 5 is a fishing net float.

As already mentioned, the net depth gauges 4, 4', r are usually attached to the lower end of the net depth gauge 3. First, a sonar device 2 emits sound waves into the water via a vibrator 1. When this sound wave is received by the transponder type silk depth gauges 4, 4', 4'', a sound wave is emitted from the depth gauges 4, 4', 4'' into the water, and this sound wave is received by the sonar device 2. That will happen. At this time, when a skinning sonar is used as the sonar device 2, sound waves are emitted omnidirectionally in all horizontal directions for transmission, and a method is adopted in which a narrow directional beam is electrically rotated at high speed during reception. Therefore, the direction of the depth gauges 4, 4', and 4'' can be read at once.Also, since a transponder method is used, the round trip time of this sound wave can be used to determine the direction between the ship and the depth gauges 4, 4'.
, 4'' can also be measured.In addition, by transmitting the net depth meter information as a response sound wave signal from the transponder using the same means as conventional net depth meters, such as frequency modulation or pulse width modulation, The depth of the depth gauges 4, 4', 4'' can be known at . Next, a method for obtaining depth, distance, and direction from depth information will be explained using FIG. 2.

As shown in Figure 2a, depth gauges 4, 4', with the ship as a reference,
The distances obtained by converting the positions of depth gauges 4, 4', 4'' onto the horizontal plane from the respective straight line distances So, So', So'' and the depth information D, D', D'' to 4'' are L, L', L'', it can be calculated from L2 = peak 2.Furthermore, as shown in Fig. 2b, the sonar can be used to determine the direct depth meter 4.
, 4', 4'' can be determined, and this can be projected onto the sonar device 2's CRT display, for example, as a converted position on the horizontal plane as shown in Figure 2c. Can be done. Connect these three points with an appropriate curve to create a “net formation”
It is easy to display close to. At this time, it is necessary to identify the response signals of the three transponder type depth gauges 4, 4', and 4'' on the sonar device side.There are various methods for this identification, one of which is, for example, coding the signals. For simplicity, let us assume that the code is as shown in Figure 3 below.As shown in Figure 3a, a transponder identification code is sent as a response signal from each transponder type depth meter prior to depth information. That's it.

For example, number 3b has an identification code of 0,1, indicating that it is a depth gauge 4, and figure 3c has an identification code of 1,0, indicating that it is a depth gauge 4'.
, and d in the figure is predetermined so that the identification code 1,1 indicates that it is a depth meter 4''.Therefore, first, the depth information with the code 0,1 is This is the depth D of the depth gauge 4, and similarly, those with codes of 1, 0 are the depth of the depth gauge 4', and those with the codes of 1, 1 are the depth D'' of the depth gauge 4''. I can read it.

These codes 0 and 1 cannot be sent as they are, so for example, if the sonar device is made for the 30K generation, 30. Corresponding spherical ultrasound pulses, 1
29 instead of. All you have to do is match the ultrasonic pulse of the water level. That is, it is sufficient to cause one transponder type depth gauge to output a response signal as shown in FIG. 3e. By the way, considering the spread of the purse seine net, the distance between the depth gauge 4, 4', 4'' and the ship, that is, the sonar device, is random, so 4, 4', 4''
'' signals may reach the ship (sonar device) at the same time, making it impossible to detect response signals.
, 4'' are assigned a ranking so that only one transponder-type depth gauge responds to each transmission from the sonar, and the depth gauges are shifted in order from 4 → 4' → 4'' → 4, etc. The response signal frequency of the depth gauges 4, 4', and 4'' may be shifted little by little.The fourth embodiment of the present invention, in which the response signals from these depth gauges are received by the sonar side, is the fourth embodiment of the present invention. It is as shown in the block diagram of the figure, and will be explained below using Fig. 4. 1 is a sonar vibrator, 6 is a sonar device, 7
8 is a discrimination circuit, 8 is a distance and depth calculation circuit, 9 is a coordinate conversion circuit, 1 is a river mark generation circuit, 11 is a video circuit, 1
2 is a display device such as a CRT, and 13 is a Shida diamond.

First, a response signal received by the transducer 1 shown in FIG. 4 is received and amplified by the sonar device 6, and then guided to the code discrimination circuit 7, where it is determined which silk depth gauge the response signal is from.

Next, the distance and depth calculation circuit 8 calculates the distances 〆, SO', SO'', depth ○, D', D'', and guides them to the coordinate conversion circuit 9. Here, the converted distances L, , and L'' on the horizontal plane are calculated, and the mark generation circuit 10 connects the marks and three points for displaying the positions of the depth gauges 4, 4', and 4^ on the CRT. A curve is generated.Furthermore, the video circuit 11 receives video signals from the sonar device 6 of the same school of fish as in a normal sonar, and the azimuths 8, 0', 8 on the horizontal plane of the depth gauges 4, 4', 4''.
Therefore, video signals of the school of fish, signals for orientation and net formation are input to the video circuit 11, and these signals are output to the display 12 where the silk at the bottom of the fishing net is input. On the other hand, the silk formation on the water surface obtained by the radar device 6 as an echo of the float 5 shown in FIG. The silk on the upper end of the fishing net is displayed at the same time as the silk on the lower end.

By means of the above-mentioned means, images of the silk formation above the water, the silk formation underwater, the school of fish, etc. can be simultaneously displayed on the display as shown in FIG.

In FIG. 5, 22 shows a CRT display, 24 shows silk above the water, 25 shows silk in the water, 26 shows an image of a school of fish, and 27 shows the own ship's position.

As explained above, this device can easily read the formation of nets both underwater and above the water, and can also read the relative positional relationship with fish schools at the same time, making it possible to eliminate operational difficulties and accurately determine the net position and net position. The result can be displayed.

[Brief explanation of the drawing]

Figure 1 is a diagram for explaining the method of detecting underwater net formation according to the present invention, Figure 2 is a diagram for explaining the calculation method for net formation, and Figure 3 is a diagram for explaining the transmission wave of the transponder net depth meter. FIG. 4 is a block diagram showing an embodiment of the method of the present invention, and FIG. 5 is a diagram showing an embodiment of the present invention. 1... Vibrator, 2, 6... Sonar device, 3... Fishing net,
4, 4', 4''... Depth gauge, 5... Float, 7... Discrimination circuit, 8
... Calculation circuit, 9... Coordinate conversion circuit, 10... Mark generation circuit, 11... Video circuit, 12... Display device, 13
...Radar equipment. 1 figure, 12 figures, 3 figures, Om figure, 5 figures

Claims (1)

[Scope of Claims] 1. A sonar device that transmits and receives sound waves containing a code for identifying a net depth meter installed in a fishing net, and a discrimination circuit that receives a signal from the sonar device and determines the identification code of the net depth meter. , a calculation circuit that receives the signal from the discrimination circuit and calculates the distance, direction, and depth to the net depth meter; a coordinate conversion circuit that receives the signal from the calculation circuit and converts the coordinates; a mark generation circuit that generates marks; a video circuit that receives signals from the circuit and signals reflected from underwater objects from the sonar device and stores them; and a video circuit that receives signals from the circuit and determines the shape of the fishing net and underwater objects. 1. A fishing net shape display device comprising: a display device for displaying. 2 Adding a radar device to the device set forth in claim 1,
The shape of the upper end of the fishing net is determined from the signal reflected from the float attached to the upper end of the fishing net (radar signal) obtained by the radar, and this is displayed together with the shape of the lower end of the fishing net and the shape of the underwater object. Characteristic fishing net shape display device.