JP2897906B2 - Calibration method of ball suspension position - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for calibrating a ball suspension position for calibrating a sphere for calibrating a fish finder for detecting a school of fish so that the sphere is positioned directly below a transmitter for transmitting sound waves. Things.

[0002]

2. Description of the Related Art As shown in FIG. 3 and FIG. 4, a fish finder mounted on a fishing boat and detecting a school of fish is mounted on a fishing boat 1 and a fish finder 2 for detecting a fish shoal transmits a sound wave a from a transducer 3. The transmitted and received wave b is reflected by the school of fish f, and the reflected wave b is detected by the transmitter / receiver 3, and the reflected wave b received by the transmitter / receiver 3 is changed according to the waveform and strength of the reflected wave b. It detects the size, distribution state, fish species, etc. of the school of fish. In FIG. 3, reference numeral 4 denotes a transmitting unit that generates a sound wave at regular intervals, as in a normal fish finder, 5 denotes a reflected wave receiving unit, and 6 denotes A.
The / D converter 7 is a display unit that displays data related to the school of fish, for example, the distribution of the school of fish, the water depth of the school of fish, and the like.

Therefore, in order to improve the reliability of the data of the displayed school of fish, it is necessary to grasp the data to be a reference in advance and calibrate the fish finder 2. For this purpose, the fish finder 2 hangs a ball 8 made of a metal such as copper or tungsten carbide under water with a fishing line 9 such as a rope, and sends the sound wave a from the transducer 3 toward the ball 8. The reflected wave b reflected and returned from the sphere 8 is detected by the transmitter / receiver 3, and the transmission output of the transmitter / receiver 3 is determined based on the depth of the sphere 8 and the reception level of the reflected wave b. The attenuation characteristic with respect to the level and the amplification characteristic of the receiving unit 5 are measured, and the fish finder 2
Is calibrated. What is important in this calibration is to arrange the suspension position of the sphere 8 just below the transducer 3. The conventional method of arranging the sphere 8 directly below the transducer 3 is as follows. The three fishing lines 9 are suspended from three directions on the fishing boat 1, and sound waves a are transmitted from the transducer 3 to the suspended balls 8, and the reflected waves b Was adjusted by moving the ball 8 while adjusting the fishing line 9 while receiving the wave from the transmitter / receiver 3, and the position having the highest reception level was calibrated as the position directly below the transmitter / receiver 3.

[0004]

However, in this conventional calibration method, the fishing line 9 is adjusted on the fishing boat 1 to move the ball 8 to a position where the wave reception level of the wave transmitter / receiver 3 is highest. However, because the highest received signal level is unknown,
There is a problem that it takes a long time to move the ball 8 to the position of the highest value, and the reliability of accurate position adjustment to the position directly below is low. According to the present invention, the suspension position of the sphere 8 can be accurately calibrated in a short time by detecting the phase angles of the waves received by the plurality of receivers and displaying the position of the sphere 8 on a plane. Things.

[0005]

According to the present invention, there is provided a transmitter for transmitting a sound wave in the direction of the sphere position in the calibration of a sphere suspension position of a sphere for calibrating a fish finder for detecting a school of fish;
At least four receivers are respectively opposed to the front, rear, left and right of the transmitter, and the receivers facing each other are provided at equal intervals from the transmitter, and are transmitted from the transmitter. Sound waves were suspended by a plurality of fishing lines at a predetermined water depth
When the reception as a reflected wave by the wave receiver and reflected by the sphere, and detects the ball position from the phase angle and the depth of the receivers to respective opposite of said four, the feed as allowed to dimensionally display the positional relationship between the filter position and the ball position on the display device, the said ball hanging position while looking at the ball position of the indicator so as to coincide with the wave transmitter located fishline
The length is adjusted for calibration.

[0006]

1 and 2 show an embodiment of the present invention. The same parts as those in FIG. 3 are denoted by the same reference numerals. In FIG. 1, 10 is a transmitter, 11 to 14 are receivers, 15 is a phase angle detection unit, 16 is a calculation / control unit including a CPU, and 17 is a keyboard. The transmitter 10 and the receivers 11 to 14
2A, the receivers 11 and 12 are positioned before and after the transmitter 10 and the receiver 13 is mounted on the fishing boat 1 as shown in FIG.
And 14 are provided on the left and right sides of the transmitter 10 so as to face each other at equal intervals. In this case, the distance between the receivers 11 and 12;
It is not necessary that the intervals between the receivers 13 and 14 match. In this state, sound wave a is transmitted from the transmitter
Is transmitted to the sphere 8 suspended by the sphere 8, a part of the sound wave a is reflected by the sphere 8 and becomes a reflected wave b to be input to the receivers 11 to 14. This received wave input is received by the receiving unit 5 and then sent to the phase angle detecting unit 15, which detects the angle of deviation of the sphere in the front-back direction based on the phase angle between the receivers 11 and 12. In addition, the shift angle of the sphere in the left-right direction is detected based on the phase angle between the receivers 13 and 14,
The data is digitized by the A / D converter 6 and operated.
It is sent to the control unit 16.

Further, since the water depth distance of the ball 8 is grasped in advance by the fishing line 9, the data is inputted from a keyboard 17 to an arithmetic and control unit 16, and the data before and after the detection by the phase angle detecting unit 15 are performed. Based on the left and right phase angles, the position of the sphere 8 on a plane with the transmitter 10 directly below (center position) is processed by the calculation / control section 16 and displayed on the display section 7 as shown in FIG. It is displayed as shown. Therefore, the calibration for moving the ball 8 to the center position is performed while looking at the display unit 7 and the fishing line 9.
Can be adjusted for quick and accurate calibration. Although the embodiment in which three fishing lines 9 are used to suspend the ball 8 has been described, it is also possible to suspend the ball 8 using four fishing lines.

After calibrating the sphere 8 to a position directly below the transmitter 10, the transmission output level of the transmitter 10 and the reception of the reflected wave of the transmission output by the sphere 8 at the receivers 11 to 14 are obtained. Each section is adjusted based on the wave input level, the gain of the receiving section 5 and the like, and the reliability of grasping the size, distribution state, fish type, and the like of the fish school in fish school detection is improved. In addition, since the water depth distance of the sphere 8 is grasped in advance and input from the keyboard 17, the sound waves a emitted from the transmitter 10
The time until the reflected wave by the sphere 8 is received by any of the receivers 11 to 14 can also calibrate the water depth distance measurement of the measuring device.

[0009]

As described above, the method of calibrating the ball suspension position according to the present invention uses the phase angle of the signal received by the receivers provided at equal intervals in front of and behind the transmitter and at the left and right sides. And the ball suspension position from the water depth distance that is grasped in advance, so that the display unit shows the position on a plane centered on the position of the transmitter, so that the calibration of the ball suspension position is displayed on the display. This can be performed while looking at the screen, and has the effect of being able to calibrate to an accurate position in an extremely short time as compared with the conventional method.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating an embodiment of the present invention.

FIG. 3 is a block circuit diagram showing a conventional technique.

FIG. 4 is a schematic diagram illustrating a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fishing boat 2 Fish finder 3 Transmitter / receiver 4 Transmitter 5 Receiver 6 A / D converter 7 Display unit 8 Ball 9 Fishing line 10 Transmitter 11-14 Receiver 15 Phase angle detector 16 Operation / control unit 17 keyboard

Claims (1)

(57) [Claims] In a calibration of a sphere suspension position of a sphere for calibrating a fish finder for detecting a school of fish, a transmitter for transmitting a sound wave in the direction of the sphere position, and a front, rear, left and right side of the transmitter. At least four receivers are opposed to each other and
The receiver is provided at a position equidistant from the transmitter, and a plurality of sound waves transmitted from the transmitter are provided at a predetermined water depth .
When the reception as a reflected wave by the wave receiver after being reflected on the sphere suspended by fishing line, to the opposite of said four
Detecting said ball position and a phase angle and the depth of the receivers, the so allowed to dimensionally displayed wave transmitter location and display the positional relationship between the ball position, prior to the indicator
A method of calibrating a hanging position of a ball, wherein the length of the fishing line is adjusted and calibrated so that the hanging position of the ball coincides with the position of the transmitter while watching the writing position.