JPH0420123B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bottom clearance display device that calculates and displays the distance from the bottom of a ship to the seabed, ie, the bottom clearance, in the sea area around the route of a ship.

[Conventional technology]

Conventionally, when navigating a ship, a safe route with a bottom clearance above a certain value is found based on reading the depth of the water, the nature of the seabed, the location of reefs, etc. from nautical charts of the area surrounding the ship's route, as well as navigational experience. , to prevent ships from running aground.

[Problem that the invention seeks to solve]

By the way, since the bottom clearance varies greatly depending on the draft state of the ship, the tidal state, etc., there is a problem in that it is not always possible to find a safe route by reading the water depth etc. using a nautical chart.

It is also possible to determine bottom clearance based on water depth measurements using a sounding device such as a sonar, but sounding devices measure the water depth very close to the ship and are not very useful for finding a safe route. There was a problem.

Furthermore, it is difficult to judge the bottom clearance of the entire area surrounding a ship from a nautical chart in a short period of time, especially in areas where ships are congested, such as in ports or narrow channels, and requires a large number of personnel, so it is best to focus only on bottom clearance. I can't. Additionally, there was a problem in that it was difficult to find a safe route if the ship deviated from the planned route due to collision avoidance or other reasons.

The present invention has been made in view of the above-mentioned circumstances, and provides a bottom clearance display device that allows the bottom clearance of the sea area around a ship to be determined at a glance.

[Means for solving problems]

The bottom clearance display device according to the present invention includes:
A position detection means for detecting the position of the ship, a draft meter for measuring the draft of the ship, a depth sounder for measuring the water depth from the bottom of the ship to the seabed, a timekeeping means for measuring time, and the water depth of the surrounding sea area in which the ship is navigating. a water depth storage device that stores the water depth for each predetermined point; a tidal storage device that stores the tide level of each of the points in the surrounding sea area for each predetermined time; Then, the water depth at each point in the displayed sea area is read out from the water depth storage device, and the tide level at each point corresponding to the time indicated by the timekeeping means is read out from the tidal storage device to set the displayed sea area. a calculation device that calculates the water depth at each point and further subtracts the water depth at each point by the draft measured by the draft meter to calculate the bottom clearance at each point in the displayed sea area; The clearance is divided into predetermined depths and identified and displayed, and the vessel detected by the position detecting means is superimposed on the identified bottom clearance, and the water depth immediately below the vessel detected by the sounding device is displayed. The apparatus is equipped with a display means for displaying.

[Effect]

The bottom clearance display device configured as described above stores the position of the ship detected by the position detecting means, the time measured by the clocking means, the draft measured by the draft meter, the water depth stored in the water depth storage device, and the tidal storage device. Based on the current tide level, the computing device calculates the bottom clearance of the sea area around the ship's route, and the display means displays the calculated bottom clearance along with the position of the ship detected by the position detection means and the water depth measured by the depth sounder. Display together.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a block diagram of a bottom clearance display device according to the present invention. In Figure 1,
1 is a radar (position detection means) that detects the position of the ship on the nautical chart, 2 is a clock (timekeeping means), 3 and 4 are draft meters that measure the draft of the ship, and 5 is from the bottom of the ship to the seabed. 6, a water depth memory device that stores the water depth of the sea area around the ship's route; 7, a tidal memory device that stores the tide level of the sea area around the ship's route; 8 indicates the position of the ship detected by the radar 1, the time measured by the clock 2, the draft measured by the draft gauges 3 and 4, the water depth stored in the water depth storage device 6, and the tide level stored in the tidal storage device 7. Based on each data,
A calculation device 9 is a CRT display device (display means) that displays the bottom clearance of the sea area around the ship's route calculated by the calculation device 8 so that the bottom clearance of the sea area around the ship's route can be clearly determined.

Next, FIG. 2 is a schematic diagram of a ship equipped with the above bottom clearance display device. The radar 1 is installed on the bridge, the clock 2, the water depth storage device 6, the tidal storage device 7, the calculation device 8 and the CRT display device 9 are installed on the bridge as the calculation display device 10, and the draft gauges 3 and 4 are installed at the bow and stern. The depth sounders 5 are respectively arranged on the bottom of the ship.

Next, see Figures 3 and 4 for an example of calculating the bottom clearance in the sea area around the ship's route based on data on the ship's position, time, draft, water depth, and tide level, and an example of displaying the calculated bottom clearance. and explain.

It is assumed that the water depth storage device 6 stores the water depth using the position of the sea area around the ship's route as a parameter. That is, the water depth storage device 6 divides the sea area surrounding the ship's route into areas of a predetermined size, and stores the water depth at a predetermined point (for example, the center point of the area) in each of the divided areas at the position of that point (for example, ,
(represented by latitude and longitude), and are stored in memory. In addition, the tidal memory device 7
is assumed to store the tide level using the position and time of the sea area around the ship's route as parameters. That is, the tidal storage device 7 stores the tide level that changes over time at a predetermined point in each of the divided areas, as shown in FIG. 3, together with the position and time of that point. be.

The calculation device 8 first determines the area where the bottom clearance is to be displayed, that is, the display sea area, based on the position of the ship detected by the radar 1. Next, among the water depths stored in the water depth storage device 6, the water depth at a position included in the displayed sea area is read out together with that position, and among the tide levels stored in the tidal storage device 7, the water depth at a position included in the displayed sea area is read out. Then, the tide level at the time indicated by the clock 2 is read out along with its position. Furthermore, the water depth and tide level read for each position are added to calculate the water depth at each position at the time indicated by the clock 2, and the draft measured by the draft gauges 3 and 4 is calculated from the water depth at each position at the time indicated by the clock 2. The bottom clearance of the displayed sea area, ie, the bottom clearance of the sea area around the ship's route, is calculated by subtracting the larger one of these, and the calculated bottom clearance is output to the CRP display device 9 together with its position.

The CRT display device 9 displays the bottom clearance of the sea area around the ship's route, which is output from the calculation device 8, as shown in the screen 40 of the CRT display device shown in FIG.

A frame 41 corresponding to the displayed sea area is displayed at the top of the screen. Inside the frame 41 are contour lines 42, 43, 44, 4 connecting points with equal bottom clearance values.
5 and 46, the part R surrounded by the frame 41 and contour lines 42 is red, the part O surrounded by the frame 41, contour lines 42 and contour lines 43 is orange, and the frame 41 and contour lines 4
The part Y surrounded by 3 and contour line 44 is yellow, frame 41
The area G surrounded by the contour line 44 and the contour line 45 is green, the area B surrounded by the frame 41, the contour line 45 and the contour line 46 is blue, and the area P surrounded by the frame 41 and the contour line 46 is filled in purple. ing. Furthermore, within the frame 41, a ship is displayed at a position corresponding to the position of the ship on the nautical chart detected by the radar 1, and the current bottom clearance value of 7.0 detected by the sounder 5 is displayed. Also, screen 4
Below 0, the bottom clearance values for each color-coded part of the frame 41 are displayed.

In addition, since the position of the ship is detected by radar 1,
For example, when a ship enters an area with a bottom clearance of less than 5 m, an alarm may be sounded to notify the user.

〔Effect of the invention〕

As explained above, according to the present invention, the bottom clearance of the sea area around the ship's route is calculated based on the ship's position, time, draft, water depth, and tide level, and this is displayed in different colors. By displaying the bottom clearance,
Bottom clearance in the sea area around the ship's route can be determined at a glance. In addition, the displayed bottom clearance allows you to know how safe or dangerous the vessel is, and allows you to easily find a safe route, so you no longer only pay attention to the bottom clearance. Collisions with ships can be prevented. Furthermore, even in sea areas where ships are congested, one-man watch or even no-man watch becomes possible, and the number of ship operators can be reduced without compromising navigational safety.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a bottom clearance display device according to the present invention, FIG. 2 is a schematic diagram of a ship equipped with the bottom clearance display device of FIG.
Figure 3 is a schematic diagram showing changes in tide level, Figure 4 is a schematic diagram showing changes in tide level.
3 is a schematic diagram of a display screen of a CRT display device 9. FIG. 1... Radar, 2... Clock, 3, 4... Draft meter, 5... Sounder, 6... Water depth data storage device, 7... Tidal data storage device, 8... Arithmetic device, 9... CRT Display device.

Claims (1)

[Scope of Claims] 1. A position detection means for detecting the position of a ship, a draft meter for measuring the draft of the ship, a depth sounder for measuring the water depth from the bottom of the ship to the seabed, a timekeeping means for measuring time, and a ship. a water depth storage device that stores the water depth of the surrounding sea area where the ship navigates for each predetermined point; a tidal storage device that stores the tide level of each of the points in the surrounding sea area for each predetermined time; and the position detection means. A display sea area is set based on the detected position of the ship, and then the water depth at each point in the displayed sea area is read from the water depth storage device, and the tide level at each point corresponding to the time indicated by the time measuring means is stored in the tidal storage device. an arithmetic device that calculates the water depth at each point in the displayed sea area by reading the information from the display area, and further subtracts the water depth at each point by the draft measured by the draft meter to calculate the bottom clearance at each point in the displayed sea area; The bottom clearance at each point in the ocean area is divided and displayed for each predetermined depth, and the vessel detected by the position detecting means is superimposed on the bottom clearance that is identified and the vessel detected by the sounding device is displayed. 1. A bottom clearance display device comprising: display means for displaying the depth of water directly below a ship.