JPS599868B2 - Recording device for fish finder for fishing in the middle water - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording device used in a fish finder for fishing in the middle water.

25 As is well known, the fish finder used in the mid-water fishing method collects information related to the net towed behind the vessel, such as the degree of opening of the net, the distance from the net to the seabed, the distance from the net to the sea surface, and the top and bottom of the net. The net is configured to detect the presence or absence of schools of fish swimming in the net, send this information to the ship, and display it on the recorder inside the ship.

By the way, the recorders of commonly used fish finders are:
The mechanism is such that the recording pen attached to the belt is pressed against the surface of the recording paper and runs at a constant speed in one direction from left to right or from top to bottom. When the transducer attached to the transducer sends out sound waves in the direction of the upper and lower blades of the net, and when the reflected signals are received and recorded and displayed, the movement of the recording pen that records information is in one direction, so the lower blade moves from the net to the lower blade. The reverberating signals from the opposite direction are recorded in a natural image that matches the actual situation.
That is, when the recording pen moves from left to right, the recording moves to the right as the echo signal moves away from the net, and when the recording pen moves from top to bottom, the recording moves downward. However, when recording echo signals from the upper blade of a net, such as on the water surface, the echo signal is recorded by moving to the right or lower blade of the net, in the same way as the signal from the lower blade, relative to the recording position of the net. The upper and lower records overlap, making it impossible to observe the top and bottom of the net in its natural state. Is this invention?
The aim is to eliminate the shortcomings of the current equipment and observe information about the top and bottom of the net in its natural state, by creating a cross-sectional diagram with the water surface as the reference line and recording the situation from the water surface to the bottom of the net in that form. This will be explained below using the drawings.

Fig. 1 shows the relative positions of the vessel, the net, and the transducer attached to the net during mid-layer fishing, Fig. 2 shows the transmission and reception situation, and Fig. 3 shows the model diagram of the record in this invention.

While towing the net 2 behind it, the ship 1 alternately transmits transmission signals T and T2 at regular intervals from two sets of transducers (TR), one facing downward and the other facing upward, attached to the top of the net mouth. ,
As shown in Fig. 2, in the downward direction, echo signals from the lower edge N of the net opening, the school of fish F, the seabed B, etc. are obtained by the transmission T1, and therefore, from the transducer respectively. The distances D1, D2, and D3 are known, and the distances D' and I)'' from the fish school F2 to the sea surface S are known from the signal T2 of the upper blade.

In middle layer pulling, the signals from the lower and upper blades mentioned above are sent to the ship by wire or wirelessly and recorded.
Fig. 3 is a model diagram when such signals are drawn on the same recording paper using the means of this invention.As shown in the figure, the water surface S is used as the reference line, and the situation below the water surface is compared to the reality. It is shown in the form. In other words, the transmission signal T1 for the lower blade and the transmission signal T2 for the upper blade overlap to form a single line, and the movement of this line indicates the movement of the upper end of the net opening in the water, and record N The distance to the net indicates the opening D of the net, and D3 indicates the distance to the seabed B. Regarding the upper blade of the net, in this example, two schools of fish F25 were recorded while running, and the distances from the net mouth were D2 and DI, and the school of fish F/ on the lower blade was:
It shows that some of the nets have entered the net, while others remain on the lower blade of the net, and the record as a whole shows the situation of the lower blade in accordance with the actual movement, with the water surface as the standard. However, this figure shows the case where the recording pen moves from top to bottom as shown by the arrow, and the lower blade of the net shows the normal recording pattern, while the upper blade of the single-strike net shows the normal recording pattern. (I will explain the reason later) The shape is shaped as if a recording pen were running from the bottom to the top.

FIG. 4 is a block diagram of an embodiment of a recording device installed on a ship to obtain records as shown in this model diagram, and FIG. 5 is an explanatory diagram of its operation. In FIG. 4 showing the configuration of the recording device, 3 is a receiver, 4 is a receiver, 5 is a sampling circuit, 6 is an analog-to-digital conversion circuit, and 7 is a receiver.
is a water surface discrimination circuit, 8 is a control circuit, 9 is a signal separation circuit, 1
0 is a lower blade signal memory circuit, 11 is an upper blade signal memory circuit, 12 is a digital-to-analog conversion circuit, 13 is an amplifier,
14 is a recorder, and P is a group of signals arriving from the network side.

The recorder 14 is of the type that drives a belt to which a recording pen is attached to obtain linear records, and has the same structure as a normal fish finder, and has no means for synchronizing with the signal sent from the net side. Since these methods are the same as those conventionally used in intermediate layer printing, these points will be omitted and the explanation will be focused on how to obtain the recording intended in this invention.

Upward transmission waves T are sent out alternately on the network side.

and the downward transmitted wave T. ', as shown in Figure 5A, echo signals from sea surface S, fish school F1, sea bottom B, fish school F2, etc. (TB in the figure is the time required for one rotation of the belt)
When obtained, the signal group P is sent from the network side to the ship, arrives at the receiver 3, is amplified by the receiver 4, and then outputs from the sampling circuit 5, the water surface discrimination circuit 7, and the control circuit. 8 respectively. Receiver 3 has a signal prior to the echo signal.
Since a pulse wave signal having the same shape as the transmitted wave generated by the induction effect during transmission arrives, the output of the receiver 4 is transmitted to the control circuit 8.
When the pulse wave is applied to the sampling pulse, it is first driven by the pulse wave and generates a sampling pulse. The sampling circuit 5 starts operating upon receiving this sampling pulse, and sequentially samples the echo signals that arrive after that, digitizes them in the analog-to-digital conversion circuit 6, and sends them to the signal separation circuit 9.
send to

The signal separation circuit 9 has upward transmission waves T which are alternately sent out.
.

and the downward transmitted wave T. ′ (actually pulse waves based on the induction of these transmission waves). separates and sorts those pointing upward and those pointing downward, and in synchronization with sampling, the signal from the upper blade is sent to the upper blade direction memory circuit 11
Then, the operation of each memory circuit is regulated so that the lower blade direction signal is stored in the lower blade direction memory circuit 10. Next, the time for storing the upper blade signal in the upper blade direction memory circuit 11 is T corresponding to the start of transmission, as shown in FIG.

It is the time t1 starting from , until the water surface discrimination circuit 7 detects the echo signal from the sea surface, and this time is regulated by the output of the first gate circuit (not shown) included in the control circuit 8. During that time, the signals are stored in the order they arrive through an internally provided reversible counter (not shown). The lower blade direction memory 10 then transmits T as shown in FIG. 5C. ' and is stored until an arbitrarily set time T2. In other words, the information on the upper blade is always stored in memory when a sea surface echo signal arrives, and when it is subsequently read out and recorded, consideration is given so that the sea surface becomes the reference. Next, the stored signal is read out in response to a signal from the control circuit 8, but since the start of readout can be controlled by the recorder 14, the recording pen is placed on the paper as shown in the model diagram. For example, if a pulse is generated to instruct the start of reading when passing a predetermined position at the top of the paper representing the sea surface, then in response to this pulse, the second gate circuit ( (not shown) is activated, and then by driving the reversible counter by 1, the upper blade signals stored in the upper blade direction memory circuit 11 are transferred from the time of transmission in the reverse order of the stored order. Until the sea surface echo signal arrives, it is read out from the opposite force direction, and once the readout is finished, the signal from the lower blade direction is read out in the forward force direction.

In this way, the read digital signal is converted into an analog signal again by the digital-to-analog conversion circuit 12, and then sent to the amplifier 1.
3 to the recorder 14, a figure is formed as shown in FIG. That is, when the stored upper blade direction signal is read out from the memory circuit, it starts from the opposite direction of force, so it is recorded as if the pen were traveling from the bottom to the top. As explained above, this invention has the same structure as the recorder for fish finders commonly used in the past, with the recording pen moving in a fixed direction on the recording paper.
It is extremely effective because it records information about the top and bottom of the net below the sea level, and can provide a graphic representation of the entire sea area that corresponds to the actual body at a glance.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the relative positions of the net, transducer, etc. in intermediate layer pulling, Fig. 2 is the situation of transmission and reception, Fig. 3 is a model diagram of recording in this invention, and Fig. 4 is a block diagram of the device according to this invention. The diagram, FIG. 5, is an explanatory diagram of the operation. 1... Vessel, 2... Net, 3...
・Receiver, 4...Receiver, 5...Sampling circuit, 6...Analog-to-digital conversion circuit, 7...Water surface discrimination circuit, 8. ...Control circuit, 9...One signal separation circuit, 10...
Lower memory circuit, 11...Upper blade memory circuit, 12...Digital-to-analog conversion circuit, 1
3... Amplifier, 14... Recorder.

Claims (1)

[Claims] 1. A net is towed behind the ship, and a transducer attached to the net sends out sound waves alternately upward and downward.Receives reflected signals from the sea surface, schools of fish, the seabed, etc., and collects information on the up and down direction of the net. In a fish finder for mid-water fishing, which is configured to grasp the information and send the information to the vessel for recording and display, it is equipped with a receiver that receives signals containing vertical information sent from the net side, and a receiver for amplifying the output of the wave transducer; a water surface discrimination circuit to which the output of the receiver is applied and discriminates a reflected signal from the sea surface; and the output of the water surface discrimination circuit and the output of the receiver are applied. a control circuit, a sampling circuit to which the output of the controller and the output of the receiver are applied and samples the output of the receiver, an analog-to-digital conversion circuit to which the output of the sampling circuit is applied, and the analog-to-digital conversion circuit. and a signal separation circuit to which the output of the control circuit is applied and separates and takes out the upward signal and the downward signal of the network, and the signal separation circuit to which the output of the signal separation circuit and the control circuit is applied and stores the downward signal. a lower signal memory circuit, an upper signal memory circuit to which the outputs of the signal separation circuit and the control circuit are applied and stores an upward signal, and a digital analog to which the outputs of the lower signal memory circuit and the upper signal memory circuit are applied. It comprises a conversion circuit, an amplifier to which the output of the digital-to-analog conversion circuit is applied, and a recorder to which the output of the amplifier is applied, and a recording ben of the recorder passes through a predetermined position on the paper surface. A recording start control pulse generated at the same time is applied to the controller, and the storage in the upper signal memory circuit starts from the first signal, and the water surface discrimination circuit detects the signal reflected from the sea surface. t_ until discrimination
For the lower signal memory circuit, reading starts from the first signal and continues for an appropriately set time t_2, and reading starts from the time when the recording start control pulse is generated. , upper signals are read out from sea surface reflection signals in the reverse order of storage, and downward signals are controlled to be read out in the same order as they were stored, so that upper and lower information is actually A recording device for a fish finder for fishing in middle water, characterized in that it is configured to display records in a straight shape.