JPH0527032A - Fish finder - Google Patents

Abstract

PURPOSE:To distinctly display the detection range according to the direction angle and depth by obtaining the detection range on the sea bottom from the detected depth for the sea bottom and the frequency of the used supersonic wave. CONSTITUTION:A receiving transmitter 1 receives and transmits the transmission signal in supersonic wave form from a transmission pa 3 through a receiving/ transmission selector 2, and the echo signal due to the transmission wave is received. A reception part 4 detects the received signal supplied from the transmission receiving device 1 through the receiving/transmission selector 2, and the output sign is A/D-converted 5. The detection range the each depth for the supersonic wave frequency is memorized in a ROM 6. A CPU 7 takes the received signal supplied from the A/D converter 5, and the depth of the sea bottom is obtained from the signal, and the detection range for the depth which is accommodated in the ROM 6 is read out. controller 8 converts the signal read out from the CPU 7 to the image data, and prepares the image data which represents the detection range in a bar graph, and displays the result on a display device 11 through a VRAM 9 and a D/A converter 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fish finder, and more particularly to a fish finder which displays a detection range in the seabed on a display.

[0002]

2. Description of the Related Art In a fish finder, the directivity angle of the transmitted beam is closely related to the ultrasonic frequency of the beam used, and the higher the frequency, the smaller the directivity angle of the transmitted beam. Becomes narrower.

[0003]

However, few users are familiar with the characteristics of such a fish finder. If you do not know the directivity angle, you can not accurately recognize the exploration result currently displayed, such as how much range you are currently detecting, whether there is "around (feeling)" but whether you are directly under your own ship etc. The reality is that the performance of the fish finder is not fully utilized. The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a fish finder that clearly displays a detection range according to a directivity angle and a depth.

[0004]

The fish finder of the present invention comprises:
An echo for the ultrasonic wave transmitted to the seabed by the wave transmitter is received by the wave receiver, the distance from the reception timing of the received signal to the probed object is calculated, and the vertical axis is displayed on the display. In the fish finder that displays the exploration result as an image with the depth scale as a scale, it is equipped with a means for determining the detection range on the seabed from the depth to the detected seabed and the frequency of the ultrasonic waves used at this time It is characterized in that the detection range is displayed on the display.

[0005]

[Operation] Once the ultrasonic frequency used is determined, the directivity angle (spread angle) of the ultrasonic beam is determined. On the other hand, the depth of the seabed is determined by the fish finder. The region of the ultrasonic beam applied to the object, that is, the detection range can be known. Therefore, if the directivity angle for the ultrasonic frequency used and the detection range for the seabed depth are stored in advance as a table, and the detection range corresponding to the measurement is read from the table and displayed on the display as a numerical value or a graph, the fish school can be detected. You can accurately know the operating status of the machine. The detection range on the seabed can be calculated from the directivity angle and the depth.

[0006]

1 is a control block diagram showing an embodiment of the apparatus of the present invention. Reference numeral 1 denotes a wave transmitter / receiver, which transmits a transmission signal from the transmission unit 3 via the transmission / reception switcher 2 as an ultrasonic wave and transmits it, and also receives an echo due to the transmission. 4 is
It is a receiving unit that detects a received signal from the wave transceiver 1 via the transmission / reception switch 2. Reference numeral 5 is an A / D converter that converts the output signal from the receiving unit 4 from analog to digital. 6
Is the ultrasonic frequency used, for example, 5
This is a ROM that stores a detection range at each depth as a table for 0 KHz and 200 KHz. 7 is C
It is a PU and takes in the received signal from the A / D converter 5, obtains the depth of the seabed from the signal, and reads the detection range for the depth stored in the ROM 6. 8 is
Although it is a controller that converts a signal read from the CPU 7 into image data, it also has a function of creating image data for displaying the obtained detection range as a bar graph, as described later. A VRAM (video RAM) 9 stores the image data processed by the controller 8. Reference numeral 10 is a D / A converter for reading from the VRAM 9 and converting it into an analog signal, and 11 is a D / A converter 1.
It is a display for displaying image data from 0.

[0007]

[Table 1]

The operation of the apparatus having the above structure will be described below. When underwater exploration is performed from the transmitter 3 using, for example, ultrasonic waves of 50 KHz, the echo due to the transmitted wave is received by the receiver 4.
Is detected by and is taken into the CPU 7. The data is read out one by one, converted into image data by the controller 8 and stored in the VRAM 9 one after another. The data stored in the VRAM 9 is converted into an analog signal by the D / A converter 10, and the underwater exploration result is displayed on the display 11 as shown in FIG.

In FIG. 2, the latest exploration result is displayed so as to flow from the right end of the screen of the display 11 to the left in response to the running of a ship equipped with a fish finder. Now, in the CPU 7, the detection range in the seabed for the detected depth of the seabed and the ultrasonic frequency (50 KHz) at this time is read from the ROM 6. In FIG.
The depth of the seabed Q that we are currently exploring is 20 m, so 8.4 m
The detection range is read out and displayed numerically at the bottom of the screen (shown as A), and also displayed as a bar graph (B
). In addition, the depth of 20 m of the seabed at this time is displayed at the lower left of the screen (indicated by C).

FIG. 3 shows the display result when the depth of the seabed is 50 m. In this case, the detection range 21 m read from the ROM 6 is displayed in the same manner. Although the detection range is stored in the ROM 6 as a table in the above embodiment, the directivity angle is determined from the ultrasonic frequency used, and the detection range on the seabed may be calculated from the directivity angle and depth. Good.

[0011]

As described above, according to the present invention, the directivity angle of the ultrasonic beam, the depth of the seabed, and the detection range on the seabed are obtained, and the detection range is displayed on the display unit by a numerical value or an appropriate graph. Therefore, the current operating condition of the fish finder can be accurately known, and the functions of the fish finder can be fully utilized.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a display example on a display unit of the apparatus of FIG.

FIG. 3 is a diagram showing a display example on the display unit of the apparatus of FIG.

[Explanation of symbols]

 1 Wave Transmitter / Receiver 2 Transmitter / Receiver Switch 3 Transmitter 4 Receiver 5 A / D Converter 6 ROM 7 CPU 8 Controller 9 VRAM 10 D / A Converter 11 Display

Claims (1)

Claims: 1. An echo for an ultrasonic wave transmitted toward the seabed by a wave transmitter is received by a wave receiver, and from the reception timing of the received signal to the object to be probed. In the fish finder, which calculates the distance and displays the exploration result as an image on the vertical axis on the display with the depth scale as a scale, the fish finder detects the depth of the sea bottom and the ultrasonic frequency used at this time to detect the sea bottom. Is equipped with a means for
A fish finder, wherein the detection range obtained by the means is displayed on a display.