JPS60237382A - Submarine fixing apparatus for underwater object finder - Google Patents

Abstract

PURPOSE:To obtain a submarine signal accurately by comparing the level between a school of fish signal and a submarine signal detected with a receiving circuit to select the signal of larger level. CONSTITUTION:An ultrasonic pulse which transmitted with a transmitter/receiver 2 driven by an output of a transmitter section 1 is reflected on a school of fish and the bottom of sea to return to the transmitter/receiver 2 again. The received signals serve as gate signals for school of fish signals and submarine signals via a waveform shaping circuit 4 and a gate circuit 5. According to the gate signal, a voltage peak holding circuit 6 sends peak values thereof to a memory circuit 9 or 10 through a D/A converter 7. The signals are compared with a comparator 12 and according to the difference, a switch 16 is changed. The switch 16 has the number of pulses written memorized until the school of fish signals or submarine signals reach thereby enabling accurate reading of submarine signals from a slave memory 18 depending on the value.

Description

[Detailed Description of the Invention] (Background of the Technology to the Invention) When using a fish finder to detect schools of fish on the seabed and its vicinity, especially in benthic fishing, waves and swells may come together and cause the pitching of the boat. When the rolling becomes large, the records of the seabed and fish schools fluctuate in response to the pitching and rolling, even though the seabed is actually flat and the fish schools are in a fixed position. It feels as if it is moving and changing its position.

When such a situation occurs, in benthic fishing, the area near the seabed is enlarged and displayed in order to observe the situation near the seabed in detail, which further disrupts records of fish schools and the seafloor, making it difficult to grasp the true appearance. As a result, the current state of the environment has not been properly observed, which has caused a serious problem in terms of fishing industry.

For this reason, techniques have been disclosed that fix an image of the ocean floor at a fixed position regardless of the movement of the ship or the undulations of the ocean floor, and visually show the image of the ocean floor as a straight line.

For example, the technique disclosed in Japanese Patent Publication No. 49-49513, as shown in the claims, repeatedly sends out a writing pulse train of a constant period corresponding to the scanning of an enlarged detection display range in connection with sending out sound waves for r detection. Then, new echo reception information is repeatedly written and stored in the storage device while erasing the memory content of the previous echo reception information, and this is stored in response to the arrival of the submarine echo signal, and the write pulse train is By stopping the sending and writing memory operation, the memory contents in the last cycle are retained and the memory contents are read out from the write stop position in the write direction by sending out a read pulse slower than the write speed. By sequentially reading out data in the same direction and adding them to the display device, the seabed display can be fixed at a fixed position and enlarged.
As seen in the claims, No. 35 includes a sawtooth wave generation circuit that is activated by a transmission pulse for underwater inspection that is generated periodically at 1FtfI and generates a sawtooth wave voltage having the same frequency as the transmission pulse; a first monostable multicircuit that generates a constant width pulse each time an incoming echo signal is received; and a sampling circuit that sequentially holds the sawtooth voltage corresponding to the time point at which the constant width pulse is applied. a halt circuit; a second monostable multicircuit driven by the transmission pulse and generating a pulse of a constant width; and a second monostable multicircuit driven by the pulse of the constant width and held in the sampling bold circuit, which corresponds to the submarine signal. The first to pass the last voltage to
a switch circuit, a hold circuit that holds the voltage corresponding to the passed submarine signal, and a hold circuit that holds the voltage corresponding to the passed submarine signal, so that the time required for the sawtooth wave voltage to reach the voltage corresponding to a predetermined time point is accelerated by a preset time T0. In order to , time T from the time of arrival of the submarine signal. It is equipped with a third monostable multi-circuit driven by the pulse extracted as soon as possible, and a second switch circuit that receives the output of the third monostable multi-circuit and allows only the submarine signal among the echo signals to pass through. Undersea echo signal tracking circuit. 1 is disclosed.

(Purpose of the Invention) In order to fix and display the seabed, it is necessary to track and reliably receive echo signals from the seabed (hereinafter referred to as seabed signals).
A tracking gate is used that opens the receiving circuit for a certain period of time in relation to the arrival point of the submarine signal, but there are problems with this tracking gate.

In other words, if you set the tracking gate to be open for a short period of time in order to prevent echo signals from fish schools (hereinafter referred to as fish signals) from entering and receive as much seafloor signals as possible, the tracking gate will not be visible due to rolling or pitching of the ship. If the water depth at the top of the sea varies greatly or the undulations of the seabed itself change significantly, if the gate width is too short, all of the seabed signals may not be included within the set gate width. may not be able to be accurately tracked.

In order to avoid this problem, if the width of the tracking gate is set to a certain length, the fish school signal will be included in the width along with the seabed signal, and in that case, the signal will be recorded before the seabed signal. Incoming fish school signals may be mistakenly recognized as seabed signals and activated, and since there is no means to correct this error, it is not possible to correctly fix and display the seabed in real time.

As mentioned above, with conventional devices, the width of the tracking gate cannot be set too short, so the gate width must be set so as not to be too long, but sometimes it is unavoidable that fish school signals are mixed. In that case, it would be affected and cause malfunction, but there was no appropriate means to deal with this.

In view of such drawbacks, the present invention provides an improved device based on the conventional technology that faithfully fixes and displays the seabed without being affected by the presence of fish school signals within the gate width. The purpose is to obtain.

(Structure and operation of the invention) FIG. 1 is a block diagram of an embodiment of the apparatus according to the present invention, and the overall structure is based on the technology disclosed in Japanese Patent Publication No. 49-49513 and Japanese Patent Publication No. 56-34835. I have to.

FIG. 2 is an explanatory diagram of the operation, and the symbols shown in each part of FIG. 1 correspond to the symbols shown.

Next, the operation of each part will be explained in order with reference to FIGS. 1 and 2.

When the transducer 2 is driven following the output of the transmitter 1 and an ultrasonic pulse is sent into the water, it hits a school of fish or the seabed, is reflected there, and returns to the transducer 2 again.

Then, at the output of the amplifier 3, signals of the transmission P, the fish school F, and the sea bottom S (see FIG. 2C) appear, and these signals are applied to the waveform shaping circuit 4.

The waveform shaping circuit 4 waveform-shapes the signals of the fish school F and the seabed S.
(see Figure 2) and sends it to the gate circuit 5.

The gate circuit '#J5 has the above-mentioned Japanese Patent Publication No. 56-34835.
The submarine signal tracking circuit described in the issue (the symbol in Figure 1 (
(corresponding to the boxed part shown in A gate signal having a predetermined time width (see Fig. 2 C) is applied, and therefore, the signals of the fish school F and seabed S shown in Fig. 2 are extracted from the output of the gate circuit 5 (see Fig. 2 C). (See Figure 2C).

Next, this output is converted into an A/D converter together with the voltage peak hold circuit 6.
When applied to the converter 7, the output of the amplifier 3 is applied to the input of the voltage peak hold circuit 6 in its original form without waveform shaping, and therefore the gate circuit 5
The peak value of the signal shown in FIG. 2d is held in the voltage peak hold circuit 6, and then converted from an analog value to a digital value in the A/D converter 7, which is then switched as described below. The level h for the fish school F is stored in the memory circuit 9, and the level 1 for the seabed S is stored in the memory circuit 10 (see Fig. 2, 11.1). .

On the other hand, the output of the gate circuit 5 is applied to the flip-flop circuit 11, so the output on the terminal Q side is as shown in FIG. 2g, and this output is applied to the switch 8. When the output is "ON", the selector switch 8 is connected to the memory circuit 9 side to store the level h of the fish school F, and when the output is [0FFJ], the output is switched to the memory circuit IO and the level 1 of the seabed S is stored.

The comparison circuit 12 compares the levels of the signals stored in the memory circuits 9 and 10, and the output obtained is used for switching the signals to be stored in the group storage device, as will be described later.

Next, the part marked with (Y) and surrounded by diagonal lines is constructed in the same way as Figure 1 described in Tokuko No. 49-49513, but here the expression is not used. It has been simplified and rewritten in the form of a block diagram. In the figure, 30 is a switch, 31 is a switching controller, 32 is a main memory H location, 33 is an address generator, 34 is a write pulse generator,
Reference numeral 36 is a read pulse generator, and 36 is a control pulse generation contact for starting enlarged recording, but a description of the operations related to each part will be omitted.

Now, the write pulse (see FIG. 2) of the write pulse generator 34 included in the means (Y) has been sent to the counter 13, and the second
Counting begins when the tracking gate shown in Figure C is applied.

The memory circuit 14 includes the flip-flop circuit 11
Since the Q-side output of , and the Q-side output is applied to the memory circuit 15, the memory circuit 14 stores the number of write pulses up to the time when the school of fish F arrives (see Fig. 2 m).
The memory circuit 15 similarly stores the number of write pulses up to the time when the seabed S arrives (see FIG. 2 m), and compares the magnitude of the levels stored in the two memory circuits with the comparison circuit 12.
As a result, for example, the level l of the memory circuit 10
If is large, the switch 16 is connected to the memory circuit 15 and the signal is sent to the down counter 17.

On the other hand, between the tracking gates shown in FIG. (See Figure 2 m) Gate circuit 1 to which the three voltages are applied
The address is specified by the address generator 20 which receives the pulse train appearing at the output of 9 (see Fig. 2), and the same procedure as in the main memory H location 32 in the means (Y) shown in the above-mentioned Japanese Patent Publication No. 49-49513 is used. During the operation of the above-mentioned tracking gate (Fig. 2C), the received signals of the fish school and the seabed are written and stored.

The written and stored signals are read out as follows.

That is, when the control pulse generating contact 36 included in the means indicated by (Y) above is activated and generates a start pulse for reading out the stored signal (see Fig. 2 m), the
As described in No. 49513, the contents of the main storage device 32 are read out from the point in time when they have advanced by the number of pulses stored in the memory circuit 15, and when the reading is finished, the contents are then generated from the switching controller 31. A control signal (see FIG. 2) is applied to the gate circuit 21. And this gate turn '1I
A read pulse (see FIG. 2 m) sent from the read pulse generator 35 is applied to J2J, and then an address is specified by the address generator 20 and the storage contents of the slave storage device 18 are read out.

The read pulse (FIG. 2O) is on the other hand applied to the down counter 17. When the number in the pulse train decreases to 0, the down counter 17 generates a read stop pulse (see m in FIG. 2) and sends it to the switching controller 31.

Thus, the read pulse control signal (n in FIG. 2) is stopped and all operations are completed.

(Effects of the Invention) The configuration and operation of the present invention are as described above, and when the tracking gate includes signals from a school of fish and the seabed, the magnitudes of both signals are compared and the larger signal is determined. The number of pulses leading up to that signal is known, and therefore the large signal stored in the secondary storage device, that is, the submarine signal, can be reliably read out.

This makes it easier to determine the gate width, prevents malfunctions even when a signal indicating a school of fish is received, and allows the seabed to be fixed in real time.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention. FIG. 2 is an explanatory diagram of the operation. 1... Transmitter, 2... Transmitter/receiver, 3... Amplifier,
4... Waveform shaping circuit, 5... Gate circuit, 6...
Voltage peak hold circuit, 7...A/D converter, 8...Switcher, 9.10...Memory circuit, 11
...Flip 7091 circuit, 12...Comparison circuit,
13...Counter, 14/15...Memory circuit,
16...Switcher, 17...Down counter, 18.
...Sub-storage device, 19...Gate circuit, 20...Address generator, 30...Switcher, 31...Switching controller, 32...1 recording device, 33...Address Generator, 34...Write pulse generator, 35...Read pulse generator, 36...Control pulse generation contact. Patent applicant Kaiyo Denki Co., Ltd.

Claims (1)

[Claims] Underwater exploration is carried out by periodically sending out ultrasonic pulses, an enlarged display range is provided for displaying the exploration results, and a writing pulse train is sent out in correspondence with the scanning of the enlarged display range.
- Write and store a new received signal in the main memory while erasing the stored contents of the received signal included in the previous cycle, store this in response to the arrival of the submarine signal, and send out the write pulse train. to stop the write memory operation and leave the memory contents in the last cycle,
A series of pulses slower than the writing speed of the stored contents are sent out, sequentially read out from the writing stop position in the same direction as the writing direction, and added to the display device to fix the seabed display at a fixed position. In a device configured to display magnified images,
Means for creating a tracking gate having a predetermined time width starting from an arbitrarily set time T earlier than the arrival point of the seabed signal, and means for shaping the waveform of the received signal from the school of fish and the seabed; means for extracting an output of the waveform-shaped received signal by applying the waveform-shaped output and the tracking gate; and a means for applying the extracted output to bold the peak value of the received signal and converting the analog value to a digital value. a means for converting, a switching means for respectively switching the received signals for the fish school and seabed converted into digital values and sending them to a subsequent stage, two memory circuits for separately storing the fish school and seabed signals, and A comparison circuit that compares the magnitude of the stored level, and a book for the main storage device that counts the time from the point where the tracking gate starts to the arrival of the school of fish and the bottom signal stored in the two memory circuits. separate memory circuits each storing the number of write pulses used for writing; a switching means for switching and connecting the separate memory circuits when the output of the comparison circuit is applied; and while the tracking gate is applying the voltage; A sub-storage device for storing the fish school and seabed signals, and a seabed having a higher level contained in the separate memory circuits, which are sent via the switching means driven by applying the output of the comparison circuit. It is equipped with a down counter that operates when a signal is applied,
A seabed fixing device in an underwater object detecting device, wherein the control signal for successive pulses for the main storage device is stopped by a pulse sent from the down counter, and all operations are terminated.