JPH0747992A - Grounding alarm device - Google Patents

Abstract

PURPOSE:To give a grounding alarm in recognizing the existence of a shoal not only on a marine chart in display but on the adjacent chart as well as to make the entity of the shoal checkable earlier insofar as possible. CONSTITUTION:An electronic chart coupling device 4 selects an electronic marine chart conformed to its own ship position detected by a position detector 2 from an electronic chart data file group 5, outputting it to a coordinate judger 1, and it is displayed on an electronic chart display part 6, while the own ship position and the traveling direction are displayed on the electronic marine chart. In addition, the electronic chart coupling device 4 selects the adjacent electronic chart, existing in a constant range in the traveling direction, from the electronic chart data file group 5, coupling data of an isobathic line and so on, and thereby one virtual electronic marine chart is formed. The coordinate judger 1 investigates on whether there is a shoal within the grounding dangerous range in the traveling direction of its own ship or not from the electronic marine chart formed by the electronic chart coupling device 4, and in the case where there is the shoal, a warning is raised by an alarm 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grounding alarm device applied to a navigation support system for ships.

[0002]

2. Description of the Related Art Conventionally, a grounding warning device applied to a navigation support system for a ship detects the position of its own ship by a position detection device, displays an electronic nautical chart corresponding to the position on a display unit, and detects a direction. If the device detects the direction of travel of the ship and there is a shallow water in the direction of travel on the displayed electronic nautical chart, there is a risk of grounding when the distance between the ship's position and the shallow water falls within a certain value. It makes a judgment and issues an alarm.

[0003]

However, the conventional grounding alarm device is designed to judge the danger of grounding only for the electronic chart being displayed, that is, for each division unit of the electronic chart. No judgment was made regarding the danger of grounding on the matched chart.

Therefore, even if there is a shallow in the nautical chart adjacent to the displayed electronic nautical chart and the distance between the shallow and the ship's position becomes a grounding danger distance, a grounding warning is issued until the display is switched to the nautical chart. There was a problem that it was not issued and the danger could not be recognized.

The present invention has been made in view of the above situation, and if the distance between the ship's position and the shallow water falls within the grounding danger distance, not only on the displayed chart, but also on the adjacent chart, An object of the present invention is to provide a grounding alarm device capable of reliably detecting the state and generating a grounding alarm.

[0006]

A grounding alarm device according to the present invention is mounted on a ship and is equipped with a position detector for detecting the position of the own ship, a direction detecting device for detecting the traveling direction of the own ship, a coastline and Based on the electronic chart data file group that stores the electronic chart that entered the information of the paper chart such as iso-depth lines, and the neighborhood in the electronic chart data file group based on the detection information from the position detector and the direction detection device Electronic chart combining device for selecting and combining electronic charts representing the sea area of 1 to create one chart, information of shallows on the electronic chart combined by this electronic chart combining device, the position detector and the direction detecting device The grounding determination device that determines whether there is a risk of grounding from the position and the traveling direction of the own ship detected by, and the position and the traveling direction of the own ship detected by the position detector and the direction detection device are electronic charts. On top An electronic chart display unit for displaying by Tsu bets, characterized by comprising a alarm to alert when it is determined to be at risk by the stranding determining device.

[0007]

The electronic nautical chart coupling device draws a semicircle of radius a (a is a grounding danger distance between the ship and the shallow water) of ± 90 ° in the traveling direction on the displayed electronic nautical chart. All electronic nautical charts including coordinate points are selected from the electronic nautical chart data file group, and iso-depth lines and coastlines are extracted from the selected nautical charts by the following procedure.

(1) From the coordinate points forming the shoreline and iso-depth line, points excluding the points on the outer frame are extracted. (2) In the area where a plurality of nautical charts overlap, only the coordinate points of any one of the nautical charts are extracted in the overlapping portion, and the other nautical charts are removed.

(3) Connect the closest coordinate points with a line. By this procedure, a plurality of adjacent electronic charts are combined into one virtual electronic chart in the electronic chart combining device. The coordinate determination device determines the risk of grounding from the distance between the ship position and the shallows based on the combined electronic chart.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a grounding warning device according to an embodiment of the present invention. In the figure, reference numeral 1 is a coordinate determination device, and a position detection device 2 for detecting the own ship position, a direction detection device 3 for detecting the traveling direction of the own ship, and an electronic chart combination device 4 are connected to the coordinate determination device 1. To be done. Further, the position data of the own ship detected by the position detection device 2 and the traveling direction data of the own ship detected by the direction detection device 3 are input to the electronic chart combining device 4.

The electronic chart combining device 4 includes an electronic chart data file group 5 composed of a plurality of electronic charts necessary for navigation.
Are connected. The electronic nautical chart in the electronic nautical chart data file group 5 is configured by inputting information of paper nautical charts such as coastlines and iso-depth lines. The electronic chart combining device 4 selects an electronic chart corresponding to the position data of the own ship detected by the position detecting device 2 from the electronic chart data file group 5,
Output to the coordinate determination device 1. The coordinate determination device 1 displays the electronic nautical chart sent from the electronic nautical chart combination device 4 on the electronic nautical chart display unit 6, and plots and displays the ship position and the traveling direction on the electronic nautical chart.

Further, the electronic chart combining device 4 is based on the traveling direction data of the own ship detected by the direction detecting device 3,
A neighboring electronic nautical chart existing in a certain range in the direction of travel is selected from the electronic nautical chart data file group 5, data such as contour water depth lines is combined, and one virtual electronic nautical chart is created and output to the coordinate determination device 1. To do. From the virtual electronic chart sent from the electronic chart combining device 4, the coordinate determination device 1 determines whether or not there is a shallow within the dangerous distance to run in the own ship, and determines the risk of grounding. If there is a risk of grounding, the alarm 7 is activated to give an alarm, and a message indicating that there is a risk of grounding is displayed on the electronic chart display unit 6.

Next, the operation of the above embodiment will be described with reference to the flowchart of FIG. First, the position detecting device 2 detects the position of the own ship (step S1), and the direction detecting device 3 detects the traveling direction of the own ship (step S2).
), And outputs the detection data to the coordinate determination device 1 and the electronic chart coupling device 4. The coordinate determination device 1 determines whether or not the position of the own ship is within the range of the nautical chart currently displayed. In the initial state, the determination result of step S3 is No. In this case, the electronic chart combining device 4 causes the electronic chart corresponding to the own ship position to be selected from the electronic chart data file group 5 (step S4), and the coordinate determination device Electronic chart display unit 6 via 1
To display the electronic chart P1 shown in FIG.
The ship position (A) is plotted and displayed as a vector in the traveling direction on the chart P1 (step S5).

After that, the electronic nautical chart combination device 4 executes the processing of steps S6 to S10 to combine the electronic nautical charts.
First, as shown in FIG. 4, within a predetermined distance from the ship position A in the traveling direction, for example, a (a is a grounding danger distance between the ship and shallow water) ±
Coordinate points on the 90 ° semicircle are calculated (step S6).
Then, all the electronic nautical charts including the coordinates in the range are selected from the electronic nautical chart data file group 5 (step S7).
The selected electronic chart becomes the target chart to be combined.
Then, it is checked whether or not the selected electronic nautical chart is a nautical chart to be newly combined, that is, whether or not it is the same as the one previously selected (step S8). If they are not the same, the coordinates of the shallows are read from the electronic charts being displayed or to be combined (step S9),
Remove points on the outer frame of each chart and duplicate points of multiple charts,
A virtual nautical chart is created by connecting the closest coordinate points with a line (step S10).

The chart created by the electronic chart combining device 4 as described above is sent to the coordinate determining device 1. The coordinate determination device 1 determines whether or not a shallow exists within the distance a in the traveling direction of the own ship from the above-mentioned chart (the chart being displayed when there is no object to be combined) (step S11), and the shallow exists. If you want to do so, activate alarm 7 to give an alarm,
A message indicating that there is a risk of grounding is displayed on the electronic chart display unit 6.

Now, for example, in FIG. 3, the own ship is a chart P1.
Suppose you are proceeding in the direction of the arrow at point A1. When the ship proceeds as it is, when the distance between the ship and the shallow water at the V point becomes a, the shallow water at the V point is determined to be dangerous in step S11 and an alarm is issued.

Further, the own ship changes the traveling direction to the point A2, and the adjacent chart P2 within the distance a in the traveling direction.
When the area of (1) is entered, one virtual nautical chart combining the nautical charts P1 and P2 is created by the electronic nautical chart combining device 4 at that time (steps S6 to S10). When the ship advances to point A2 and the distance between the Z point and the shallows on the chart P2 becomes a, the shallow point at Z is judged to be dangerous in step S11, and an alarm is issued. That is, even before the display is changed from P1 to P2, the warning is issued for the shallow water on P2.

After the alarm is issued as described above, or when it is determined in step S11 that there is no shallow water within the distance a, the own ship position detection process in steps S1 and S2 Returning to the detection processing, the above processing is repeatedly executed.

[0019]

As described above in detail, according to the present invention, the current nautical chart being displayed and the nautical chart adjacent thereto are combined to create one nautical chart, and based on the nautical chart, the nautical chart in the traveling direction of the ship is displayed. Since the shallow water is recognized and the alarm is issued, the grounding warning can be issued by recognizing the presence of the shallow water not only on the displayed chart but also on the adjacent chart. For this reason, even before the display of the nautical chart is changed, the presence of shallow water can be confirmed at an early stage, and extremely high safety can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a grounding warning device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a processing operation in the embodiment.

FIG. 3 is a view for explaining the electronic nautical chart combining operation and the grounding alarm generation operation in the embodiment.

FIG. 4 is a diagram for explaining a combining operation of electronic charts in the embodiment.

[Explanation of symbols]

 1 coordinate determination device 2 position detection device 3 direction detection device 4 electronic nautical chart coupling device 5 electronic nautical chart data file group 6 electronic nautical chart display unit 7 alarm

Claims (1)

[Claims] 1. A position detector mounted on a ship for detecting the position of the ship, a direction detecting device for detecting a traveling direction of the ship, and an electronic device which inputs information on a paper chart such as a coastline and a contour line. Based on the electronic nautical chart data file group storing the nautical chart and the detection information from the position detector and the direction detecting device, the electronic nautical charts representing the neighboring sea areas in the electronic nautical chart data file group are selected and combined to form 1 Electronic chart combining device that creates one chart, information of shallows on the electronic chart combined by this electronic chart combining device, position of own ship detected by the above position detector and direction detecting device, grounding from the traveling direction A grounding determination device for determining whether or not there is a risk, the position of the ship detected by the position detector and the direction detection device, an electronic nautical chart display unit for plotting and displaying the traveling direction on an electronic nautical chart, Above stranding A grounding warning device, comprising: an alarm that gives an alarm when the judgment device judges that there is a danger.