JPH0238915B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an anchor monitoring device using radar.

(Prior Art) Conventionally, devices with a maritime monitoring function to ensure the navigational safety of ships have mainly been configured to use radar to monitor the risk of collision. The purpose was to monitor and prevent marine accidents from occurring.

However, even when a ship is at anchor, strong winds may cause the anchor chain to lose its restraint on the ship, causing the ship to drift, so-called dragging anchor. There were also cases of marine accidents such as ships running aground.

As means for solving these problems, there are methods as shown in, for example, literature and Japanese Patent Application No. 141,878/1982, and the method will be explained below.

The method shown in Japanese Patent Application No. 58-141878 is a monitoring method in which the position of an anchored ship is determined from radar echoes. An anchor is characterized in that the average value of the position information is determined, and an alarm is generated when the distance difference between the determined average value and the current position of the ship exceeds a preset value. It is a monitoring method. In other words, the average value of past position information for the certain period of time is
This method assumed a fixed point whose position did not change, and monitored the distance difference between that fixed point and the current position of the ship.

(Problem to be Solved by the Invention) However, the method described above has a drawback in that when a ship drifts at a very low speed, the anchor cannot be detected. Another problem was that a large amount of hardware and calculation time were required to store the position information and calculate the average value.

(Means for Solving the Problems) The present invention provides (a) a radar for observing ships at anchor; (b) determining and storing the position of the ship from the signal of the radar, and assigning an identification number to the ship. (c) means for setting a processing condition consisting of a center position of a pre-given anchorage point of the vessel having the identification number and a radius of the anchorage point; (d) means for setting processing conditions by the radar; Means for calculating the distance difference between the observed current position of the ship and the center position of the anchorage point corresponding to the identification number of the ship, and outputting an alarm instruction when the value exceeds the radius of the anchorage point. and (e) means for displaying a warning in accordance with the warning instruction.

(Function) According to the present invention, an anchor-dragging monitoring device is realized with the above-described configuration, and the center position of a given anchoring point is assumed to be a fixed point whose position does not change, and the position of the fixed point and the radar are observed. The system calculates the distance difference between the current position of the ship and generates a warning by comparing that distance difference with the radius given in advance to the fixed point, so even if the ship is drifting at very low speed, it can be detected immediately. can be detected and the shortcomings of the prior art can be overcome.

(Example) FIG. 1 is an overall configuration diagram of an example of the present invention,
In the figure, 1 is a radar, 2 is connected to the radar,
This is a signal input converter that processes the radar signal and outputs it as a digital signal. In other words, the signal input converter 2 processes the radar echo signals of ships at anchor, converts the position of the ship (hereinafter referred to as observation ship position), etc. into a digital signal, and also provides an identification number ( (hereinafter referred to as ID).

Reference numeral 3 denotes an environmental state input means, which inputs the digital signal converted by the signal input converter 2 as the environmental state, and stores and sets the observation ship position corresponding to the ID of each ship.

Reference numeral 4 is an operating device for inputting processing conditions for each ship.

Reference numeral 5 denotes a processing condition setting means, which stores and sets the processing conditions inputted from the operating device 3, such as the center position of the anchorage point and the radius of the anchorage point corresponding to the ID of each ship.

6 is an alarm state determination means, which
Based on the processing conditions set by the means of When the radius exceeds the aforementioned anchorage point, it is assumed that the anchor is dragging, and an alarm state is set, for example, in an output register.

Reference numeral 7 denotes an operation alarm output means, which detects the alarm state and outputs an alarm to the display 8.

Note that all of these means can be realized using well-known digital circuits, microprocessors, etc., and their operations will be explained below with reference to the flowchart of FIG.

FIG. 2 is a flowchart of software for executing control calculations of the means constituting the present invention, and .about. in the figure indicate steps of each process.

Steps . . . represent the process of inputting radar signals from the radar, specifying the echo of the ship to be monitored from among them, assigning an ID to the echo, and storing its position as the observation ship position.

Steps .
This represents the process of inputting and storing the radius. In this case, the identification number is assumed to be ID, the center position of the anchorage point is stored as P ₀ , and the radius of the anchorage point is stored as R.

Step (12) is performed by the above-mentioned alarm state determination means, and assuming the state shown in Figure 3, the current observation ship position of a vessel with a certain ID and the anchorage corresponding to that ID are determined. Calculate the distance difference from the point, compare it with the radius of the anchorage point corresponding to that ID, and store the comparison result in register A, for example.
It is output as an alarm instruction corresponding to the ID. This step is or.

In the step, the above-mentioned operation alarm output means outputs the contents of register A to the output register, and displays "danger" on the display connected to it, corresponding to each ID.
Or display "safety".

This embodiment executes the above steps, but with the exception of these steps, it is also possible to execute the radar every rotation or to monitor a large number of ships by changing the ID. .

(Effects of the Invention) As described above using the examples and flow charts, according to the present invention, even when a ship is drifting at a very low speed, it can be reliably detected. Further, the present invention can be realized with a very simple configuration compared to conventional anchor dragging monitoring devices, and can provide an inexpensive anchor dragging monitoring device.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the present invention, Fig. 2 is a flowchart for explaining the operation of the embodiment of the present invention, and Fig. 3 is an explanation of a method for monitoring anchor dragging in the embodiment of the present invention. This is a diagram for 1...Radar, 2...Signal input converter, 3...
Environmental state input means, 4... Operating device, 5... Processing condition setting means, 6... Alarm state determining means, 7... Operation alarm output means, 8... Display device.

Claims (1)

[Scope of Claims] 1 (a) a radar for observing ships at anchor; (b) means for determining and storing the position of a ship from the signal of the radar and setting an identification number for the ship; ( c) means for setting processing conditions consisting of the center position of a pre-given anchorage point of the vessel having said identification number and the radius of said anchorage point; means for calculating the distance difference between the position and the center position of the anchorage point corresponding to the identification number of the vessel, and outputting an alarm instruction when the value becomes equal to or greater than the radius of the anchorage point; (e) means for outputting an alarm instruction; An anchor dragging monitoring device comprising means for displaying a warning according to an instruction.