JPS63210682A - Water temperature display system for fish finder - Google Patents

Abstract

PURPOSE:To enable referring to data in the past retroactively, by calling and displaying a memory data of water temperature at a desired time from a memory data stored in a memory. CONSTITUTION:A receiving signal with respect to an ultrasonic reflection echo from a transmitter/receiver 2 is stored into a main memory 13 through a receiver 3, an A/D converter 4 and a transmitting/receiving sub memory 5. An analog signal corresponding to water temperature from a water temperature sensor 7 is stored into the main memory 13 through an oscillator 8, a pulse width measuring device 9, an A/D converter 10 and a water temperature submemory 11. By the operation of a control panel P, a water temperature data at a desired time is called from the main memory 13 and can be shown on a CRT tube display device 15.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for displaying water temperature at a desired time using a fish finder mounted on a ship.

[Conventional technology]

Fish finders transmit ultrasonic waves into the sea, receive reflected echoes from the seabed, fish schools, etc., and use this information to improve fishing. Information can be recorded on recording paper using a recorder or displayed using a cathode ray tube or the like, with the latter method becoming more common these days. In addition, some displays are displayed in color using a cathode ray tube to make the information easier to distinguish. The information displayed on the cathode ray tube includes information necessary for fishing support, such as water depth, boat speed, and water temperature, in addition to the ultrasonic echoes described above.

In the conventional display method, as shown in FIGS. 3 and 4, the transmitting position 26, the height of the seabed 27, and the presence or absence of fish schools 28 are displayed as ultrasonic echoes on the screen of the cathode ray tube display 15 in chronological analog fashion. Ru. The water temperature is the current water temperature 3
There is a method in which 7 is displayed numerically (FIG. 4), and a method in which the water temperature 38 is displayed chronologically in analog form (FIG. 3) in the same way as ultrasonic echoes.

[Problem that the invention seeks to solve]

Water temperature data and water depth data are important information for fishing expos, and in many cases data on not only the current own ship position but also the past own ship position (positions where ships have passed) is required.

However, if you want to know the past water temperature, the method shown in FIG. 4 cannot tell you the past water temperature. Furthermore, with the method shown in Figure 3, the water temperature in the sea area displayed on one screen can be determined along with the water depth, but the state of change in water temperature in the sea area that the ship has passed through earlier cannot be determined.

The present invention was made to eliminate such inconvenience, and provides a method for displaying water temperature information in a manner that is easy to understand.

[Means for solving problems]

In order to solve the above problems, the water temperature display method of the fish finder of the present invention stores the reflected echo data of the ultrasonic waves emitted from the fish finder and the water temperature data in a storage device. The data recalling and displaying method of the fish finder is characterized in that stored water temperature data at a desired time is retrieved and displayed from the water temperature stored data stored in the storage device.

[Effect]

Since the stored water temperature data at a desired time can be called up and displayed from the water temperature stored data stored in the storage device, water temperature information from the past to the present can be immediately found by selecting as needed.

〔Example〕

Examples of the present invention will be described in detail below.

FIG. 1 is a block circuit diagram of a device implementing a display system for a fish finder to which the present invention is applied.

In the figure, 1 is a transmitter, 2 is a transducer, 3 is a receiver, 4 is an analog-to-digital converter, 5 is a sub-storage device for transmitted and received signals, and 7
is a water temperature sensor (for example, a thermistor), 8 is an oscillator, 9 is a pulse width measuring device, 10 is an analog-to-digital converter, 1
1 is a water temperature sub-storage device, 13 is a main storage device, 14 is a digital-to-analog converter, 15 is a cathode ray tube display device, 17
18 is a control circuit, 18 is a synchronization signal generation circuit, 19 is a deflection circuit, P is an operation panel, and 33 is a navigation device.

In this circuit, the transmitter l generates a transmission signal, which is a high-frequency electrical signal with a constant pulse width, by a trigger pulse of a fixed period,
Supplied to the transducer 2. The transducer 2 is installed on the bottom of the ship, has, for example, an electrostrictive element, vibrates in response to the above-mentioned transmission signal, and generates ultrasonic waves. The ultrasonic waves hit a school of fish or the seabed and are reflected, and a reflected echo returns to generate an echo reception signal, which is a high-frequency electric signal, from the electrostrictive element. The echo reception signal is supplied to the receiver 3. I also received the transmitted signal! 3. At this time, there is a time delay during the round trip of the ultrasonic waves from when the transmission signal is generated until the echo reception signal is received. The delay is the distance to the school of fish. The transmitted signal and echo received signal from the receiver 3 are sent to an analog-to-digital converter 4.
and are converted into digital signals. The digital signal is stored in the sub-storage device 5, which has a capacity to store a digital signal generated by one transmission and reception of a pulse wave. The transmitted and received signals stored in the sub-storage device 5 are stored as signals corresponding to one scanning line of the cathode ray tube display device 15. The transmitted and received signals are sequentially transferred from the sub storage device 5 to the main storage device 13. Although the main storage device 13 consists of a video RAM, the cathode ray tube display device 1
The secondary storage device 5 also shifts each time one scan is transferred, and when the capacity is full, the newly stored data disappears in order from the oldest one. Therefore, the main storage device 13 stores more data signals than are displayed on the screen of the cathode ray tube display device 15.

On the other hand, the water temperature sensor 7 is submerged in the sea, and its resistance value changes depending on the temperature of the seawater. The zero oscillator 8 converts this change in resistance value into a voltage and sends it to the oscillator 8, which oscillates a voltage according to the water temperature. The pulse width measuring device 9 measures the oscillation pulse width. That is, an analog output corresponding to the water temperature can be obtained from the pulse width measuring device 9. This analog value is converted into a digital signal by an analog-to-digital converter IO. The water temperature digital signal is transmitted to the cathode ray tube display device 1.
Each signal corresponding to one scanning line of 5 is stored in the sub-storage device 11. The water temperature signal stored in the secondary storage device 111 is sequentially transferred from the secondary storage device 11 to the main storage device ff113 and stored therein. As explained above, the main storage device 13 also stores ultrasound transmission and reception signals at the same time. The transmission/reception signals and water temperature signals stored in the main storage device 13 are retrieved and converted into analog video signals by the digital-to-analog converter 14 and supplied to the cathode ray tube display device 15. The deflection circuit 19 of the cathode ray tube display device 15 includes a synchronizing signal generating circuit 1.
A synchronizing signal is given from 8, and the data of the ultrasonic transmission/reception signal and the water temperature signal are displayed as an image on the cathode ray tube display device 15.

The timing of the operation order of these circuits is controlled by a signal from the control circuit 17.

In the normal mode, as shown in Figure 4, the 0 image display, which displays one screen from the latest data, scans vertically starting from part A in the figure, and the image moves in the direction of arrow X. .

Therefore, the latest data is displayed in part A, and the arrow
The further you move in the direction, the older the data becomes. Data older than one screen is not displayed in this mode, but is stored in the main storage device 13.

In the circuit shown in FIG. 1, there is a mode in which a command signal for the control circuit 17 is output by specifying a sampling time, and data stored in the main memory 13 is retrieved and displayed. That is, even if the data stored in the main storage device 13 is old data that is not displayed in the normal mode, it will be displayed as long as it has not been updated and deleted. In this mode of display, as shown in FIG. 2, a graph 21 of water temperature is shown along with a sampling time 20.

A position on the screen can be designated by operating the cursor 22, and when designated using the cursor 22, the water temperature 30 and water depth 31 for that location are displayed numerically.

If necessary, specify the water temperature alarm range 24 on the operation panel P (see Figure 1) as shown in Figure 2 (61'F or higher as shown), and a warning sound will be generated when this temperature is exceeded. You may also do so.

In addition, the navigation equipment 3 can be specified with the cursor 22 shown in FIG.
3 (see FIG. 1) can also be displayed on the screen. 34 in FIG. 2 indicates latitude, and 35 indicates longitude.

〔Effect of the invention〕

As explained above, the display method of the fish finder of the present invention can select and display data from the past to the present as needed, so it is possible to display past positions (positions where ships have passed). Data can be referenced retrospectively. Therefore, the optimal sea area can be immediately determined along with water temperature and water depth, making it extremely useful for fishing.

[Brief explanation of the drawing]

Fig. 1 is a block circuit diagram of a device implementing the display method of a fish finder according to the present invention, Fig. 2 is a diagram showing an example of the display, and Fig. 3 is a diagram showing an example of the display.
FIG. 4 is a diagram showing a conventional display example. 1...Transmitter 2...Transducer 3...
・Receiver 4・io, Analog-digital converter 5, ,
Transmission/reception signal sub-storage device 7, water temperature sensor 8109 oscillator 9, pulse width measuring device 11, water temperature sub-storage device 13, main storage device 14, digital-to-analog converter 15, .
, Braun tube display device 17, , Control circuit t a, , Synchronization signal generation circuit 19, , Deflection circuit 21 Water temperature graph 22
...-Cursor 24 ・ ・Alarm range 26 ・
... Transmission position 27 ... Seabed 28 ... School of fish 33 ... Navigation equipment P - ... Operation panel Patent applicant Japan Radio Co., Ltd. Agent Patent attorney Yoshio Komiya - Hajime. 3,1'

Claims (1)

[Claims] 1. Storing the reflected echo data of the ultrasonic waves emitted from the fish finder and water temperature data in a storage device, and recalling the stored data and displaying the data stored in the storage device in the display method of the fish finder. A water temperature display method for a fish finder, characterized in that stored water temperature data at a desired time is retrieved and displayed from the water temperature stored data.