KR0164914B1 - Fish finder - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fish finder suitable for easily storing information according to fish detection using a personal computer and reproducing the stored information later. Although the image reading ability is superior to that of the fish locator, it is uneconomical due to the difficulty in preserving the record, reproducing the preserved record, and having a high price. However, in the present invention, the information is stored by realizing the fish locator using a low cost and generalized personal computer. And because it is easy to reproduce, that is, it is a color fish group detector using a general-purpose personal computer, it can be used to increase the fishing productivity of general fishing vessels. Application is possible Further development of the fish finder can contribute to the localization of the fish finder for fish resource investigation, and can be used as an echo sounder when sailing, entering and leaving or passing through the narrow channel. It is possible to improve the above-mentioned shortcomings because it can be used for sounding depth, deep sea sounding depth, seabed strata structure investigation.

Description

Fish finder

1 is a block diagram showing an embodiment of a slave type fish group detector using a personal computer according to the present invention.

2 is a block diagram showing an embodiment of a master color fish group detector using a personal computer according to the present invention.

3a and 3b are flow charts showing step by step an embodiment of the signal processing flow of the fish finder according to FIG.

Figures 4a and 4b is a flow chart showing step by step an embodiment of the signal processing flow of the fish finder according to FIG.

* Explanation of symbols for main parts of the drawings

2,30: Transmission unit 4,28: Ultrasonic transceiver

6,8,32 A / D converter 10,22 Personal computer

24: signal input and output unit 26: monostable oscillator

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fish finder, and in particular, a fish finder suitable for easily storing information according to fish detection using a personal computer and easily reproducing the stored information thereafter. It is about.

In the prior art, the color fish finder, which is increasingly widely used in fishing vessels, has better image reading power than the previous recordable fish finder, but it is difficult to preserve the record and reproduce the preserved record. Resource detectors, developed to enable the preservation and reproduction of records, are priced at over $ 100 million. In recent years, electronic charts have been spreading even in offshore fishing boats, and many of them are developed in developed countries.

As computers are being used a lot in ships, color fish finder or electronic chart using personal computer can be used by software only to perform various functions. The cost may be much cheaper than a dedicated machine.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fish finder that can display echograms in color by facilitating application of a personal computer to a commercially available black and white recordable fish finder and facilitates storage and reproduction of information. have.

In order to achieve the above object, the present invention provides a transducer for converting an ultrasonic pulse signal into an acoustic signal and radiating it in water or converting an acoustic signal reflected back to an underwater reflector into an ultrasonic pulse signal. And an ultrasonic TX / RX board which transmits an ultrasonic pulse signal to the transceiver or receives and amplifies and detects an ultrasonic pulse signal reflected from an underwater reflector from the transmitter and the ultrasonic transceiver. An A / D converter which receives an ultrasonic pulse analog signal according to reflection from an underwater reflector and converts it into a digital signal, and processes the digital signal converted into a digital signal to display an echogram function and And a personal computer that performs a function of storing and reproducing information accordingly. do.

Hereinafter, described in detail by the accompanying drawings an embodiment of the present invention as follows.

FIG. 1 is a block diagram showing an embodiment of a slave-type color fish group detector using a personal computer according to the present invention. The ultrasonic wave signal is converted into an acoustic signal to be emitted in the water or the emitted acoustic signal is a reflector in the water. A wave unit 2 for converting an acoustic signal reflected back to the ultrasonic wave signal into an ultrasonic pulse signal, and an ultrasonic pulse signal transmitted to the wave unit 2 or reflected from the wave unit 2 to a reflector underwater Ultrasonic transceiver 4 for amplifying and detecting an echo signal and outputting an echo signal and a trigger signal, and a first A / for converting the echo analog signal of the ultrasound transceiver 4 into a digital signal. A D converter 6, a second A / D converter 8 for converting the trigger analog signal of the ultrasonic transceiver 4 into a digital signal, and the first and second A / D converters 6 , 8) It processes the digital signals signal and a personal computer 10 that performs the function of storing and reproducing the echogram display function and therefore information based.

2 is a block diagram showing an embodiment of a master color fish group detector using a personal computer according to the present invention, which generates a trigger signal and processes a digital signal to store and reproduce an echogram display function and information accordingly. A personal computer 22 that performs a function, a signal input / output unit 24 for inputting / outputting a trigger signal of the personal computer 22, and a stage for adjusting the width of the trigger signal of the signal input / output unit 24 to a specific size Ultrasonic transceiver 26, which outputs an ultrasonic pulse signal according to the trigger signal of the monostable oscillator 26, and amplifies and detects the ultrasonic pulse signal reflected and returned, and the ultrasonic transceiver ( 28) converts the ultrasonic pulse signal into an acoustic signal and emits it underwater, or the acoustic signal is reflected by the reflector underwater and returns Is converted into an ultrasonic pulse signal and is applied to the ultrasonic wave transceiver 30, and the ultrasonic wave signal reflected from the ultrasonic transceiver 28 is returned to the digital signal to convert the personal computer And an A / D conversion section 32 to be applied to (22).

The present invention made as described above is as follows.

3A and 3B are flow charts illustrating, in stages, an embodiment of a signal processing flow of a fish finder according to FIG.

4A and 4B are flowcharts illustrating, in steps, an embodiment of a signal processing flow of a fish finder according to FIG. 2.

Referring to FIGS. 3A and 3B, the slave type color fish group detector shown in FIG. 1 is operated to operate the personal computer 10 to determine initial values such as sound wave transmission rate (hereinafter referred to as sound velocity) and sounding range. Set and run the program (42).

This initializes the elapsed time and then waits for a trigger signal to be detected (62, 64).

At this time, the trigger signal is a TTL level (Transistor Transistor Logic level).

Next, detect the moment when the trigger signal falls from the high level to the low level and start the analog / digital conversion, counting the elapsed time and continuing the analog / digital conversion while the sound wave travels the maximum detection distance. Input the echo signal according to (66,68,70)

Next, when the sound wave proceeds to the maximum detection distance and the analog / digital conversion is completed, the current time is acquired and stored in the buffer (not shown in the drawing) set with the input echo signal (72, 74, 76). .

At this time, 512 echo data are recorded in the buffer after detecting the trigger signal.

The contents of the stored buffer are read to display the echogram, and the time when the echo signal is input on the upper part of the echogram is displayed at one minute intervals. When the same graphic is done, move the echogram to the left side of the dot screen (44, 46, 48).

Of course, the time at which the echo signal is input may be displayed at different time intervals, and may be distinguished and displayed in various colors according to the waveform signal voltage of the echo signal.

Next, the function key of the personal computer 10 includes a maximum depth setting function to be displayed on the screen, a gate function for adjusting the width and depth of the section to express the echo voltage on the A-scope as a letter, and an echogram. A shift function that allows the display depth to move up and down by 10m, echogram display / non-display function for storing echo data at high speed, and the function to switch to the playback screen are allotted. Can be invoked with key interruption. When the personal computer 10 displays the echogram and the like, the key interruption is searched. If there is a key interruption, the corresponding function is activated, and then the input of the next trigger signal is waited for (50, 52).

Referring to FIGS. 4A and 4B, the master type fish group detector shown in FIG. 2 is operated by operating the personal computer 22 to set initial values such as sound speed and sounding range, and then operate the program. The trigger signal generated by the computer 22 is input to the monostable oscillator 26 through the signal input / output unit 24 so that the monostable oscillator 26 is suitable for driving the ultrasonic signal transceiver 28 with the trigger signal. To be applied to a predetermined trigger terminal of the ultrasonic transceiver unit 28.

Therefore, when the trigger signal with the adjusted width is input, the ultrasonic transceiver 28 emits 50kHz, 600Vp-p ultrasonic pulse signal through the water receiver 30 in the water.

As shown in FIG. 4B, the personal computer 22 starts analog / digital conversion immediately after generating and outputting a trigger signal to input and process echo signals from the ultrasonic transceiver unit 28 (102, 104, 106, 108, 110).

Since the subsequent operation is similar to the slave-type fish finder according to FIG. 1 described above, the description of the operation will be omitted and refer to FIGS. 4A and 4B.

Looking at the use of the fish finder according to the present invention as follows.

Since the fish finder according to the present invention is a color fish finder using a general-purpose personal computer, it can be used not only to increase the fishing productivity of general fishing vessels but also to easily store and reproduce information. It can also be applied to surveys of fishing conditions, distribution of fish field, and changes in resource volume in Korea.

For research purposes, it can be used to re-analyze field data from echograms, echo voltage magnitudes, and echo waveforms, thereby contributing to the localization of quantitative fish finders or scientific fish finders for resource research. The fish finder and echo sounder are exactly the same in principle, so they can be used as acoustic echoes when sailing, entering and leaving or passing through narrow channels, and according to the performance of the ultrasonic transmitters and receivers (4,28) It can be used for use.

In addition, the fish finder according to the present invention must have accurate TVG (Time Varied Gain) function to accurately measure or determine the size of the fish or the size of the fish group from the intensity of the signal reflected from the underwater target. In this case, the TVG function compensates for the transmission loss (diffusion loss + absorption loss) of the sound wave energy, so that when measuring the same object at a depth of 1m or at a depth of 150m, the reflected signal has the same size. do.

On the other hand, in order to process the above-described TVG in hardware, a TVG amplifier having a wide dynamic range is required. A TVG amplifier having a dynamic range of 100 m or more is not only difficult to produce but also expensive to produce.

Therefore, since the fish finder according to the present invention uses the A / D converters 6, 8, 32 and the personal computers 10, 22, it is possible to accurately compensate for the transmission loss according to the transmission distance of the ultrasonic pulse by a formula. The dynamic range of TVG can be taken very large, and this TVG function is handled almost in software.

Here, the definition of the terms used above is briefly described as follows.

Transistor Transistor Logic (TTL):

TTL has a multi-emitter structure, which reduces the capacity of the gate circuit to shorten the charging time, and actively discharges the accumulated charge between the base and emitters of the output transistor by the transistor operation. In order to improve the time, the output stage has a totem pole type circuit to increase fan out and at the same time, the upper end of the output acts as an emitter follower, It is increasing.

Typical TTL gate circuit specifications include supply voltage 5V, level 1 3.5V, level 0 0.25V, level 0 input current 1.7mA, noise margin + 1V, power consumption 22mW, average propagation time 6-15ns and fan out. 5-12 pieces, and the operating temperature range is 0-75 ℃.

Monostable multi-vibrator:

When one of two CR combinations of an unstable multivibrator is combined in series, there is no change when there is no input signal, and a square wave of constant width is generated according to the input signal (trigger pulse), and the output has one stable state It is used to increase or decrease the circuit, pulse width, and delay circuit.

Ultra-audible sound, ultrasonic wave

An inaudible sound wave above the threshold frequency audible to the human ear, which is essentially the same as the audible sound wave, but invisible to the human ear, so it is completely different from the audible sound in application and can be used for fish detection, depth measurement, metal damage detection, medical Diagnosis, production of milk products, dispersion of solid particles into liquids, cleaning, ultrasonic processing, soldering of aluminum, medical and other technical applications have been developed in recent years. Also, by measuring the speed of sound accurately, the elastic modulus of the material can be obtained. It is a research tool of physics.

As described above, the fish group detector according to the present invention has the following effects.

First, since it is a color fish finder using a general-purpose personal computer, the cost of a good fish finder can be reduced, and thus it can be used to increase the fishing productivity of general fishing vessels.

Second, since the information can be easily stored and regenerated, it can be applied to researches on the calculation and distribution of fish heads, and changes in the amount of resources. Therefore, further development of such fish finders will lead to the localization of the quantitative fish finder (aka scientific fish finder) for fish resource investigation. Can contribute to

Third, it can be used as an acoustic echo sounder when sailing or entering or leaving the port or passing through a narrow channel, and can be utilized as an acoustic echo sounder for deep sea surveying, a deep sea sounder, and a seabed strata structure survey according to the performance of the ultrasonic transceiver unit 4,28.

Claims (2)

A water wave unit (2) for converting an ultrasonic signal into an acoustic signal to radiate it in water or converting the acoustic signal reflected by the reflector in the water into an ultrasonic signal; An ultrasonic transceiver unit (4) for transmitting an ultrasonic signal to the transceiver (2) or receiving an ultrasonic signal reflected from the transceiver (2) to a reflector in the water to output an analog echo signal and an analog trigger signal; A first A / D converter 6 for converting the analog echo signal of the ultrasonic transceiver 4 into a digital signal; A second A / D converter (8) for converting the analog trigger signal of the ultrasonic transceiver unit (4) into a digital signal; Slave including a personal computer 10 for processing the digital signals of the first and second A / D converters 6 and 8 to perform an echogram display function and a function of storing and reproducing information. Type fish finder. A personal computer 22 for generating a trigger signal and processing digital signals to perform an echogram display function and store and reproduce information accordingly; A signal input / output unit 24 for inputting and outputting a trigger signal of the personal computer 22; A monostable oscillator 26 for adjusting the width of the trigger signal of the signal input / output unit 24 to a specific size; An ultrasonic transceiver unit 28 which outputs an ultrasonic signal according to a trigger signal of the monostable oscillator 26 and receives an ultrasonic signal reflected and returned; The ultrasonic signal from the ultrasonic transceiver unit 28 is converted into an acoustic signal and radiated in water, or the ultrasonic signal reflected from the underwater reflector is converted into an analog ultrasonic signal and converted into an analog ultrasonic signal to the ultrasonic transceiver unit 28. A receiver 30 for applying; And an A / D converter (32) for receiving an analog ultrasonic signal returned from the ultrasonic transceiver unit (28), converting the signal into a digital signal, and applying the analog ultrasonic signal to the personal computer (22).