JPS63145983A - Guidance of ship's position - Google Patents

Abstract

PURPOSE:To accurately guide a ship's position by measuring the longitude, latitude and height from a reference point on land with regard to a ship on the sea by a light wave range finder from land. CONSTITUTION:A light wave range finder 1 and a reflecting mirror 2 are provided on land and on a ship, respectively, and the relationship between the coordinates and the direction and the mechanical height of the range finder 1 are accurately measured. Accordingly, only by measuring reflected light from the reflecting mirror 2 on the ship and the horizontal angle of the range finder 1, the X-Y coordinates of the ship can be determined. Further, since difference from the mechanical height of the range finder 1 can be also measured, the ground height of the reflecting mirror 2 on the ship can be determined at the same time. Measured values obtained are converted to telemeter signals by a telemeter 3 and transmitted to the ship. The measured values from land are projected on a display and can be printed out as required. The person in charge of the ship can guide the ship in correct direction by comparing projected points thus obtained with a projected line to the measured and, if different, correcting the direction.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for guiding the position of a ship on the ocean during oceanographic research.

<Conventional technology> When performing various measurements such as flow conditions and water temperature during ocean research associated with ocean development, it is necessary to accurately guide a research vessel at sea along measurement lines connecting measurement points and to measure those measurements. Measurements need to be taken.

Therefore, in order to accurately guide a ship, it is essential to accurately measure the position of the ship on the ocean.

Currently, radio positioning devices (EOP, etc.), Loran C1GPS
, and measure the ship's position using measurement methods such as a light wave rangefinder.
It is used for actual survey work.

The measurements taken in this way are collected on board the ship, converted to latitude and longitude, and displayed on a nautical chart.

The display method is performed by connecting to an XY block and a television cathode ray tube, and when maneuvering the ship, the captain guides the ship while checking the position of the measurement line and the ship.

Problems to be Solved by the Present Invention The conventional ship position guidance method described above has the following problems, especially in cases such as seabed topography surveys that require strict ship position accuracy. .

Previously, the ship's position was displayed on a plane of latitude and longitude using the various measurement methods described above.

However, the height of sea level is constantly changing.

Therefore, in order to measure the height of a ship from the seabed, the conventional method requires measuring the tide level separately and then correcting the height of the ship from the seabed according to changes in the tide level, which is time-consuming. .

As mentioned above, in order to calculate the height of a ship from the seabed, it is necessary to obtain the tide level separately and then calculate it by combining the two.

As a result, measurements of the ship's position at the same location and time cannot be obtained.
The accuracy of the ship's position decreased, making it difficult to accurately guide the ship's position.

OBJECT OF THE INVENTION The present invention was made to solve the above-mentioned problems.It measures the latitude and longitude of the ship's position and the height from the reference point on land at the same time, thereby making it possible to accurately determine the ship's position. The purpose of the present invention is to provide a ship position guidance method that allows highly accurate ship position guidance based on the measured values.

Configuration of the Present Invention> An embodiment of the present invention will be described below with reference to the drawings.

<A> Measuring the position of a ship on the ocean The present invention is a method of measuring the position of a ship using a light wave rangefinder 1, as shown in FIG.

The light wave rangefinder 1 is a device that can measure the position of an object from a remote location, and has a measurement accuracy of 1 at a distance of 1 kra.
It has an extremely high precision of ~2 cm.

That is, as is well known, a light wave ranging device [1] is placed on land, and a reflector 2 is placed on a ship.

The relationship between the coordinates and the direction of the light wave range finder 1 on land, as well as the mechanical height, have been accurately measured.

Therefore, the XY coordinates of the ship can be determined simply by measuring the reflected light from the reflecting mirror 2 on the ship and by measuring the horizontal angle of the light wave range finder 1.

Furthermore, since it is possible to measure the difference between the mechanical height of the light wave rangefinder 1,
The ground height of the reflector 2 on the ship can also be determined at the same time.

<Exposure> Ship position guidance method The measured values obtained as described above are converted into a telemeter signal 5 by the telemeter 3 and transmitted to the ship.

Onboard the ship, measurements taken from the ground can be immediately projected onto a display and printed out if necessary.

The person in charge of the ship compares this projected point with the planned line to be measured, and if there is a discrepancy, corrects the direction and guides the ship in the correct direction.

At the time of guidance, the ship is guided so that it sails on the measurement line 4 while accurately maintaining the ship's direction using a gyro.

Effects of the Present Invention> Since the present invention has been described above, the following effects can be expected.

Previously, on a ship, the ship's position could only be displayed on a plane of latitude and longitude.

However, when surveying the topography of the ocean floor, it is necessary to also measure the height of the ship from the ocean floor.

Therefore, in conventional methods, in order to measure the height of a ship from the seabed, it is necessary to separately measure the tide level, and then correct the ship's height from the seabed in accordance with changes in the measured tide level. It took a lot of work.

However, the present invention has made it possible to measure the latitude and longitude of the ship's position and the height from the base point on land simultaneously and with high precision.

Therefore, the height of the ship from the seabed can be instantly determined on board the ship, eliminating the traditional troubles and
By obtaining measurements at the same time, we succeeded in increasing the accuracy of ship position measurements.

Therefore, it is possible to accurately guide the ship's position.

〉As mentioned above, the ship's position can be measured accurately.

Therefore, it is possible to accurately conduct seawater flow surveys and other oceanographic surveys such as temperature and salinity.

[Brief explanation of the drawing]

Claims (1)

[Claims] Measure the latitude and longitude of the ship's position on the ocean and the height from a reference point on land using a light wave rangefinder from land, send each measurement value to the ship, and record each measurement value. A ship position guidance method characterized by guiding the ship by comparing observation lines.