JPS6375611A - Depth-of-water display apparatus - Google Patents

Abstract

PURPOSE:To automatically correct the depth of water of the periphery of an own ship on the basis of the measured depth of water at the position of the own ship, by providing a depth-of-water correction apparatus for correcting the output of a depth-of-water memory apparatus on the basis of the output of a depth-of-water correction quantity calculating apparatus to supply the corrected one to a display device. CONSTITUTION:A depth-of-water measuring apparatus 4 measures the depth of water at the present time at the position of an own ship and, for example, an echo sounder can be utilized as said apparatus 4. An automatic position memory and depth-of-water calculation apparatus 5 calculates the depth of water to be stored at the position of the own ship on the basis of the position of the own ship being the output of a ship position measuring apparatus 1 and the depth of water at the point stored being the output of a depth-of-water memory apparatus 2. A depth-of-water correction quantity calculation apparatus 6 calculates the difference between the measured depth of water at the position of the own ship being the output of the depth-of-water measuring apparatus 4 and the stored depth of water at the position of the own ship being the output of the own ship position memory and depth-of-water calculation apparatus 5 to output the same as depth-of-water correction quantity. A depth-of- water correction apparatus 7 adds the depth-of-water correction quantity being the output of the depth-of-water correction quantity calculation apparatus 6 to the depth of water at each point stored in the depth-of-water memory apparatus 2 to output the addition value as the depth of water being corrected. The value of said correction apparatus 7 is displayed on a display device 3 as the depth-of-water information of a sea area.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a water depth display device that uses a ship position measuring device and a water depth measuring device to display the water depth of a sea area where the ship is scheduled to sail.

(Prior Art) FIG. 3 is a block diagram of a conventional water depth display device, in which 1 is a ship position measuring device, 2 is a water depth storage device, and 3 is a display device.

The ship positioning device 1 measures the ship's own position, and for example, a Loran C navigation device can be used. The water depth storage device 2 is
9 For example, the latitude of the points forming each contour line at low tide,
It stores longitude and coordinates.

The display 3 displays the water depth information of the sea area including the planned navigation area from among the water depth information stored in the water depth storage device 2 based on the ship's own position which is the output of the ship position measuring device 1.

Figure 4 is an explanatory diagram showing the conventional method, where a is the own ship position,
For example, b is the lQm contour line at low tide, and the black circle mark is 1
These are the points that make up the 0m isocontact line, and C is, for example, 2 at low tide.
It is a 0m isobath line.

The white circles are points that make up the 20m contour line.

5 For example, the land in 9 ports is indicated by diagonal lines.
· be. The ship's position a in Figure 1 is measured by the ship's position measuring device in Figure 3. 10771 isobath line at low tide and 20m isobath line alt at low tide in Figure 4
This is stored in the water depth storage device 2 in FIG. 3, and is realized by storing the greatness and longitude of the black circles that make up the 10m contour line and the white circles that make up the 20m contour line, respectively.

As described above, conventional display devices of this type display the memorized water depth, for example, at low tide, within the necessary range.

By the way, in areas where the water depth is shallower than twice the draft of the own ship, such as in nine ports, the rudder effectiveness tends to change greatly depending on the water depth. It is important to estimate this for safe ship operation.

Also, depending on the size and speed of the ship, even if a ship attempts to make an emergency stop, it will move forward by about 1 nautical mile. There are cases where the depth of the water at the end of the river and the depth of the water one depth away are significantly different.

In this way, it is necessary to determine the depth of the water in the area to be sailed in advance for safe ship operation.

Furthermore, in sea areas with large tidal differences such as in a port, the water depth at low tide and the water depth at high tide may differ greatly.

To summarize what has been said above, in sea areas such as ports and harbors, the conventional method of displaying the water depth at low tide (for example, the water depth at low tide) in the sea areas where the ship is scheduled to sail, poses two problems in terms of safe ship maneuvering. there were.

(Problems to be Solved by the Invention) The present invention eliminates this drawback and provides a water depth display device that can automatically correct the effects of ebb and flow and display water depth. The present invention will be explained below with reference to the drawings.

(Means for Solving the Problems) FIG. 1 is a block diagram showing an embodiment of the present invention, in which 1 is a ship position measuring device, and 2 is a water depth storage device.

3 is a display, 4 is a water depth measuring device, 5 is an own vessel position memory water depth calculation device, and 6 is a water depth correction amount calculation device.

7 is a water depth correction device, which constitutes a water depth display device.

Ship position 4111 fixing device 1 is for measuring own ship position.
It is the same as the ship position 1till fixing device 1 in Fig. 3,
A storage device 2 is used to store water depth and its position in the water ζ', and is the same as the water depth storage device shown in FIG.

For example, an echo sounder can be used to measure the water depth at the current time even at the own ship's position. The automatic position memory water depth calculation device 5 stores a memorized water depth that can be used to calculate the own ship position based on the own ship position, which is the output of the ship position tracing device 1, and the water depth at the memorized point, which is the output of the water depth storage device 2. Calculate all.

The water depth correction amount calculation device 6 calculates the difference between the measured water depth of the own ship position, which is the output of the water depth measuring device 4, and the memorized water depth of the own ship position, which is the output of the own ship position memory water depth calculation device 5, and makes water depth correction. It is output as a quantity.

The water depth correction device 7 adds a water depth correction amount, which is the output of the water depth correction amount calculation device 6, to the water depth of each point stored in the water depth storage device 2, and outputs the result as a corrected water depth.

The display device 3 that receives this output uses the ship's own position, which is the output of the ship position measuring device 1, to select the sea area including the planned navigation area from among the water depths corrected at each point, which is the output of the water depth correction device 7. This is the same as the display 3 in FIG. 3.

Fig. 2 is an explanatory diagram of an example of own ship position memorization water depth calculation, where a is the own ship position, b and b' are the points forming a 10m isobath line at low tide, for example, and C and C' are points at low tide, for example. 2
These are the points that make up the 0m contour line. Using this diagram, the operation of own ship position memory water depth calculation example @5 in FIG. 1 will be explained.

For points b', c, and c', select two iso-search lines that surround own ship position a, for example, from among the water depths and their positions stored in the water depth storage device 2 in FIG.

And select two points on each iso-locating line so as to surround own ship position 1.

Denote the water depth as d, the latitude as ψ, and the longitude as λ, and each of the four points a and b
, b', c, c' s (dt+ψ1.λ1)
+(d2)ψ2. λ2)I(d3193.λ3L(d4
194. λ4), (d5゜ψ5.λ5).

In addition, the water depth d is linear with latitude ψ longitude λ, and the coefficient CI
As C2+ C3.

When expressed as d=(:, ψ+C2λ+C3, the following equation is obtained for each point b', b', c, c'.

d2=C, ψ2+C2λ2+C3 d3=C, ψ3+C2λ3+C3 d4=C1ψ4+C2λ4+C3 d5=C1ψ5+C2λ5+C3 The coefficient CI r 02 + C3 can be obtained by the method of least squares. in particular.

Defining Jmi (C1ψH+Czλi+C3-di)2 quantity-2, sCI+C2+C3 can be obtained by solving the linear simultaneous equations for CIrC2+C3.

The coefficients C2+C3 obtained in this way and the latitude ψ1 of the ship's position. Using the longitude λ1, the memorized water depth d of the ship's position can be obtained as dl=c, ψ1+C2λ1+c3.

Next, the operation of this embodiment will be explained with reference to FIG. 4, which has already been described.

The position of the water depth at low tide stored in the water depth storage device 2 in FIG. 1 is represented by isolines S and C in FIG. 4, which are Iom and 20 m at low tide, respectively.

Further, the water depth at the own ship position a at the current time measured by the water depth measuring device 4 in FIG. 1 is assumed to be 19771.

It is assumed that the water depth at the own ship position a at low tide, which is the output of the own ship position memory water depth calculation device 5, is 18 m.

At this time, the water depth correction amount that is the output of the water depth correction amount calculation device 6 is 19 m - 18 m = 1 m.

The water depth correction device 7 adds this water depth correction amount of 1 m to the water depth stored in the water depth storage device 2 and outputs it to the display 3.

As a result, the iso-search lines S and C shown in FIG. 4 represent lines at water depths of 11 m and 21 m, respectively, at the current time.

The iso-location lines that have undergone these corrections are automatically displayed on the 1st display screen together with the ship's own position, and 11
It is also possible to display numbers and letters necessary for navigation such as m121m.

In addition, it can be combined with other navigation equipment to simultaneously display various types of navigation information on the screen.

(Effects of the Invention) As explained above, the present invention makes it possible to automatically correct the effects of tides, and display the water depth, which is important for safe ship maneuvering, especially in ports. is remarkable.

Heather.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention. Fig. 2 is an explanatory diagram of an example of an example of own ship position memorization water depth calculation;
FIG. 3 is a block diagram of the conventional device, and FIG. 4 is an explanatory diagram of the operation. 1...Ship position measuring device, 2...Water depth storage device, 3...
・Display device, 4... water depth measuring device, 5... own ship position memory water depth calculating device, 6... water depth correction amount calculating device, 7...
・Water depth correction device.

Claims (1)

[Claims] In a water depth display device that has a ship position measurement device and a water depth storage device and displays the water depth of a planned navigation area on a display based on the stored water depth information, from the outputs of both the ship position measurement device and the water depth storage device. An own ship position memorized water depth calculation device that calculates the memorized water depth at the own ship position, a water depth measurement device that measures the water depth at the own ship position, and a water depth calculated from the outputs of both the water depth measurement device and the own ship position memorized water depth calculation device. A water depth correction amount calculation device that calculates a correction amount, and a water depth correction device that corrects the output of the water depth storage device based on the output of the water depth correction amount calculation device and supplies it to the display, A water depth display device characterized by automatically correcting the water depth around own ship based on the water depth.