JPS644128B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a track display device that displays the track of a ship on a display such as a cathode ray tube and also displays the track of a net towed by the ship.

The wake can be recorded using a Loran receiver, an Omega receiver or
Navigation equipment such as NNSS receivers are used to measure the position of the own ship as it navigates, and the results are displayed on the display. A track display device that displays only a track is disclosed in, for example, Japanese Patent Laid-Open No. 57-56705.

The net position is determined by measuring the position of the net relative to the own ship's position, and is displayed on the display based on the measurement results.

In the seine fishing method, the own boat is equipped with a fish finder that detects the area beneath the bottom of the boat. Therefore, by knowing the position of the net and towing the net along the wake of the ship, it is possible to efficiently capture schools of fish detected by the fish finder.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a display state on a cathode ray tube display of a track display device according to an embodiment of the present invention.

On the display surface 1, a wake 2, a net trace 3, a latitude line 4, and a longitude line 5 are displayed, and the current position 2' of the own ship and the net position on the display surface 1 are displayed according to the displacement of the own ship's navigation position. The current position 3' is also moved.

FIG. 2 shows a block diagram of an embodiment of the invention.

The display memory 10 has storage elements arranged corresponding to each pixel of the display 6, and a horizontal scanning counter 1.
1. The vertical scanning counter 12 sequentially reads out the stored contents of each storage element. Horizontal scan counter 11 counts clock pulses from clock pulse source 13. Then, an output pulse is sent to the vertical scanning counter 12 every time the same number of clock pulses as the number of pixels in the horizontal direction of the display device 6 is counted. The vertical scanning counter 12 counts the output pulses of the horizontal scanning counter 11 and sends out an output pulse every time it counts the same number of pulses as the number of pixels in the vertical direction of the display 6.

Horizontal scanning counter 11 and vertical scanning counter 1
2, each output pulse of horizontal and vertical scanning circuit 1
4. The horizontal/vertical scanning circuit 14 performs pixel scanning of the display 6. For example, when a cathode ray tube display is used, the pixel position corresponding to each count of the horizontal scanning counter 11 and the vertical scanning counter 12 is scanned with an electron beam. Further, each count value of the horizontal scanning counter 11 and the vertical scanning counter 12 is sent to the display memory 10, and the storage contents of the storage element corresponding to each count value are read out. The read stored information is sent to the display 6 and displayed. Thereby, the contents of the storage elements corresponding to each pixel of the display 6 are displayed.

The information stored in the display memory 10 is displayed on the display 6 as described above, while the writing of the stored information is performed by the microprocessor 15 (hereinafter referred to as CPU).
).

First, the own ship position is written based on position data measured by the navigation device 16.

The navigation device 16 is, for example, a Loran receiver, an Omega receiver, an NNSS receiver, or the like, and measures the navigational position of the ship and transmits the measured position as, for example, latitude and longitude data. Latitude and longitude data sent from the navigation position 16 are sent to the CPU 15 via an interface 17.

The CPU 15 uses the latitude and longitude data of the current position of the ship sent from the navigation device 16 to perform coordinate conversion to determine the corresponding position on the display screen of the display device 6. In this coordinate transformation, for example, a position on the display screen is made to correspond to a specific latitude and longitude position, and a position on the display screen corresponding to the latitude and longitude position measured using that position as a reference position is calculated.

The own ship position on the display screen calculated in this way is written into the corresponding storage element of the display memory 10.

Horizontal scanning counter 11, vertical scanning counter 12
If the signals stored in the display memory 10 are sequentially read out and supplied to the CRT display 6 using
The track 2 shown in the figure is displayed.

Next, when displaying the traces of the net, first find the position of the net relative to the current position of your ship using distance and direction.
Next, this position is converted into latitude and longitude, and the mesh position represented by this latitude and longitude is written into the corresponding storage element of display memory 10.

FIG. 3 is a diagram showing the relative relationship between the boat and the net, with FIG. 3A showing a plan view and FIG. 3B showing a longitudinal side view.

In FIG. 3, a net 30 is being towed by a boat 31. The net 30 is located at a straight line distance L from the ship 31 to the net, a vertical direction θ _V , and a horizontal direction θ _H . The horizontal distance L _H from the ship to the net can be calculated as L _H = L cosθ _V.

FIG. 4 shows an explanatory diagram used when converting the network position into latitude and longitude.

In Figure 4, 2' indicates the current position of the ship;
3' indicates the current position of the network. Assume that the ship is moving in the absolute direction θ _N , and the orientation of the net with respect to the ship's traveling direction is θ _H. Distance of the net to the ship in the X-axis direction
Lx is calculated as Lx=L _H sin(θ _N −θ _H ), and distance Ly in the Y-axis direction is calculated as Ly=L _H cos(θ _N −θ _H ). Latitude on the display screen corresponding to distance Lx, Ly,
Since longitude can be easily calculated, the current position of the net relative to the own ship's position can be expressed in terms of latitude and longitude.

In FIG. 2, the net position detector 18 detects the linear distance L from the boat to the net, and the vertical direction θ _V of the net with respect to the boat.
and horizontal direction θ _H via interface 19.
Send to CPU15. The heading detector 20 is
For example, it is composed of a gyro compass, and sends the ship's heading θ _N to the CPU 15 via the interface 21 . The CPU 15 first calculates the horizontal distance L _H from the ship to the net based on L _H = L cos θ _V , then calculates the latitude and longitude of the current position of the net after calculating Lx and Ly, and then performs coordinate conversion. A position signal is written into the storage element of the display memory 10 corresponding to the current position of the network. This operation is repeated as the ship and the net move forward, and the position signals of the net are sequentially written into the display memory 10.

Horizontal scanning counter 11, vertical scanning counter 12
If the signals stored in the display memory 10 are sequentially read out using the display device 10 and supplied to the display 6, the track 2 and the screen track 3 are displayed together as shown in FIG.

In the above embodiments, a cathode ray tube is used as the display, but the display is not limited to this, and well-known displays such as a plasma display, an electroluminescent display, and a liquid crystal display can be used.

In addition, in the above embodiment, the wake is a continuous line,
Although the traces are shown with broken lines, it is also possible to display the wakes and traces in different colors.

As described above, according to the present invention, the ship's own ship's track and the trace of the net can be displayed together on the display.

[Brief explanation of the drawing]

FIG. 1 shows the display state of a cathode ray tube display used in an embodiment of the present invention. FIG. 2 is a block diagram of an embodiment of the invention. FIG. 3 is a diagram showing the relative relationship between the boat and the net. FIG. 4 is an explanatory diagram used when converting a net position into latitude and longitude. 1 is the display surface of the display device, 2 is the wake, 3 is the net trace, 4
5 is a latitude line marker, 5 is a longitude line marker, 6 is a display, 30 is a net, and 31 is a ship.

Claims (1)

[Scope of Claims] 1. Display means for displaying the ship's wake and the net traces towed by the ship on its display surface, and storing signals corresponding to each of the ship's wake and the net traces. a storage means; a control means for reading out the signal from the storage means and supplying it to the display means; a navigation device for measuring the navigational position of the ship; a net position measuring device for measuring the position of the net; Calculates the position of the ship constituting the wake based on the information sent from the heading measuring device to be measured and the navigation device, writes the ship position signal to the storage means, and writes the ship position signal to the storage means from the net position measuring device and the ship owner's direction setting device. A track display device comprising: a control unit that calculates a screen position constituting the screen trace based on the transmitted information and writes a screen position signal into the storage means.