JPH03205511A - Ocean investigating method - Google Patents

Abstract

PURPOSE:To observe a wide-range measurement result in real time at each time of measurement by receiving the position data of other ships measured by the other ship and the data on the state of the sea nearby the ship, and displaying plural wakes formed by this ship and other ships while sailing at the same time differently according to the state of the sea. CONSTITUTION:Plural ships for investigation are used basically and each ship measures its current position and the state (e.g. water temperature, tidal current, water depth, wind direction or wind speed) of the nearby sea. Namely, one ship and other ships sail in a sea area to be investigated at the same time and this ship measures its ship position and the state of the nearby sea and also receive position data and data on the sea states measured by the other ships. The wake TM of this ship and the wakes TS1 - TS6 of other ships are displayed on a CRT in different colors or with different line kinds by spe cific information among measurement items, e.g. temperature width set previous ly for water temperature, and consequently the distribution in an equal- temperature area comes to clear at a glance, so that a wide sea area can be investigated in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a marine survey method for observing the distribution of specific information representing sea conditions such as water temperature, current, water depth, wind direction, and wind speed in a certain sea area.

(b) Prior Art Conventionally, water temperature distribution and tidal current distribution have been observed over a relatively wide range of sea areas for the purpose of fishing ground surveys. In addition, surveys of tidal currents, water depth, wind direction, and wind speed are being carried out in the target sea area for the purpose of preliminary environmental assessment and investigation of construction methods for underwater construction.

The method for conducting such oceanographic surveys is to have a research vessel scan the survey area at approximately equal intervals, and measure certain items such as water temperature, tidal current, water depth, wind direction, and wind speed along the way. Therefore, the distribution of specific information is observed by collecting data and displaying this data in two dimensions, for example, on a display.

(C) Problems to be solved by the invention For example, water temperature can be automatically measured by a temperature sensor, and tidal currents can be automatically measured in the direction and velocity of each layer by the Dosobra effect that accompanies the transmission and reception of ultrasonic pulses. It can be measured accurately.

Regarding water depth, the depth of the ocean floor over a relatively wide range can be automatically measured using a so-called cross-fan beam method that uses fan-shaped ultrasonic transmitting and receiving beams. Wind direction and speed can also be easily measured using wind direction and anemometers.

However, in order for a research vessel to observe the planar distribution of the above various survey information for the entire survey area, it must sail back and forth across the survey target area at certain intervals according to the required resolution. It takes a long time to conduct ocean research. In addition, as a result, the measurement time at each point in the survey target area varies greatly depending on the area, and for survey items that change rapidly over time, only unreliable survey results may be obtained, or the survey results themselves may not be meaningful. Sign.

The purpose of this invention is to provide an oceanographic survey method that allows the survey to be completed in a short time even when conducting a wide ocean survey, and also allows measurement results over a wide range to be observed in real time each time a measurement is performed. be.

(Means for Solving Problem d1) The marine survey method of the present invention not only measures the position of the own ship and the state of the sea near the own ship, but also measures the position data of other ships measured by other ships and the state of the sea near the ship. A survey that represents the sea state by receiving data representing the sea state and displaying multiple tracks obtained by simultaneous navigation of the own ship and other ships in different colors or line types depending on the sea state. It is characterized by observing the distribution of information.

tel action The oceanographic survey method of the present invention basically uses a plurality of survey vessels, and each part measures the current position and nearby ocean conditions (for example, water temperature, current, water depth, wind direction, wind speed, etc.). The own ship (a specific ship among the multiple ships listed above) measures its own position and the state of the sea near its own ship, and also measures the position data of other ships (vessels other than its own ship) and other ships. Receive data representing sea conditions near the ship. At the same time, by having the own ship and other ships navigate the survey target area at the same time, the own ship can obtain data representing the measured positions and sea conditions of each ship, including the own ship. The data string representing the position of each ship obtained here can be regarded as the ship's track, and by displaying the track in different colors or line types depending on the data representing the sea state obtained, the sea state can be determined. It is possible to observe the distribution of survey information representing .

An example of the display is shown in FIG. In FIG. 5, TM is the own ship's track, and TSI-TS6 are the tracks of different other ships. Each track is displayed in a different color or line type depending on a preset temperature range for certain information among measurement items, such as water temperature. This makes the distribution of the isotemperature region clear at a glance.

For example, by having a fleet of vessels, including one's own ship as the main ship and other ships as subordinate ships, sail in parallel at predetermined survey target sea areas at approximately equal intervals, a wide ocean area can be surveyed in a short period of time.

ff) Embodiment FIG. 1 shows a block diagram of the control section of the survey device installed on each ship, which is used in the ocean survey method of the present invention.

In FIG. 1, the CPUI controls the entire control section by executing a program written in advance in the ROM2. RAM 3 is used as various working areas such as temporary storage of various measurement data when the program is executed. The VRAM 4 is a memory that stores display data, and the display control circuit 5 stores VRA at a predetermined timing.
M 4 reading system 1 wholesale. The video output circuit 6 generates a video signal from the output signal of the VRAM 4 and outputs a C R
．． A synchronization signal and a video signal are output to T7. CR
T7 displays the track of each ship using colors or line types representing sea conditions as shown in FIG. The navigation device 8 is a Loran C receiver, a GPS receiver, or the like, and measures the current position of the ship. The water temperature measuring device 9 includes a temperature sensor that measures the sea surface temperature, a drop-in type water thermometer that measures the water temperature in each layer, and the like. The tidal current measuring device 10 is a device that transmits and receives ultrasonic pulses and measures the direction and speed of the tidal current in each layer by measuring the time difference until the reflected wave returns and the Dossopra shift. The water depth measuring device 1) measures the depth of the seabed over a certain width centered directly below by emitting a fan-shaped ultrasonic transmitting beam and receiving the wave with a fan-shaped receiving beam perpendicular to the transmitting beam. The communication device 12 is a device that transmits and receives various measurement data to and from other ships. The various devices mentioned above are connected to an interface circuit 13. The fluoropy disk device 15 is an external memory that stores data measured by the various devices described above, and the interface circuit 14 performs a data writing and reading interface.

The above RAM 3 and Frosobee disk device 15
FIG. 2 shows the structure of the storage area for the various data mentioned above.

In FIG. 2, the position of each measurement point is stored as latitude and longitude data, and along with this, water temperature, current (current direction, current velocity), and water depth are stored, respectively. In addition, in this example, the water temperature,
Neither the tidal current nor the depth distribution is measured. Also,
Regarding water temperature, only the depth directly below is measured.

The structure of the measuring device shown above is the same for both the main ship and the slave ship, but the CPU of the measuring device installed on the main ship and the slave ship is
The processing procedures are different. The processing procedure of the measuring device installed on the main ship is shown in FIG. 3, and the processing procedure of the measuring device installed on the slave ship is shown in FIG. 4, respectively.

As shown in Figure 3, the main ship's measuring device first sets the number of subordinate ships that make up the fleet together with its own ship as NS (n1
). Subsequently, the loop counter C is set to an initial value of 1, and a request signal requesting the C-th slave ship to transmit measurement data is transmitted (n2-n3). As a result, the first slave ship receives the request signal from the main ship, measures each measurement item, and transmits the data to the main ship. The main ship receives and stores this data (n4-n5). Subsequently, measurements are made for each item in the same manner for the own ship (main ship), and the data are stored (n6). Repeat steps n3 to n6 of Step 7 above while incrementing C until the loop counter C reaches the number of subordinate vessels NS (n7-=n8→n3)
...). After receiving and storing a set of data for all subordinate vessels, display data for displaying tracks by color or line type for specific measurement items as shown in Figure 5 is created and displayed. Write to the above VRAM4 (n
9). After that, at the next measurement timing, the process of receiving measurement data from each subordinate ship is performed again (nlo-n2→
...).

On the other hand, as shown in Figure 4, when the slave ship first receives the request signal from the master ship, it reads and stores the position of its own ship (the slave ship that received the request signal from the master ship) from the navigation device. <n20-=n21). Next, each data of water temperature, current, and water depth is read from each measuring device and stored (
n22-=n23-n24). Thereafter, each of the obtained data is converted into transmission data in a predetermined formant and transmitted to the main ship (n25-n26). Furthermore, create display data for displaying own flight track and display VRA.
Write to M. The above process is repeated every time a request signal is received from the main ship.

The main ship and subordinate ships carry out the measurement process according to the procedure shown above, and each ship navigates parallel routes at predetermined approximately equal intervals. A track like the one shown in Figure 5 will be displayed.

Incidentally, depending on the size of the sea area to be surveyed, the number of ships forming the fleet, and the required resolution between tracks, it may be necessary for each ship to sail back and forth in a certain area. Navigation examples in that case are shown in FIGS. 6(A) and 6(B). In both figures, Sl.
S2 and S3 are ships that conduct research, and each ship sails at a substantially constant speed in the direction of the arrow. The method shown in Figure (A) is characterized in that the survey target area is divided into equal parts between each ship's route, so the resolution between the routes is gradually improved.

Furthermore, the method shown in FIG. 2B has the effect of shortening the overall cruising distance.

In the example, the main ship requests data transmission from each specific subordinate ship in sequence, but in addition, for example, the main ship may transmit a basic pulse, and after a predetermined time delay, each The subordinate ships may sequentially transmit data. Also,
The relationship is not limited to the relationship between a master ship and a slave ship, and each ship may receive measurement data of other ships.

(Effects of the invention) According to this invention, it becomes possible to conduct marine surveys over a wide area with short cruising distances and cruising times for each ship.Also, it is possible to obtain highly reliable survey results even for survey items that vary greatly over time. can be obtained.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an investigation device that is an embodiment of the present invention. Figure 2 is a diagram showing the structure of the data storage area stored in the RAM and Flosobee disk of the same device;
4 and 4 are flowcharts showing the processing procedure of the apparatus. The fifth example is a display example of the survey results. Figure 6 (A
). (B) is a diagram showing an example of navigation of each ship.

Claims (1)

[Claims] (1) In addition to measuring the own ship's position and the state of the sea near the own ship, it also receives position data of other ships measured by other ships and other data representing the sea state near the ship. A marine survey method characterized by observing the distribution of survey information representing the sea state by displaying a plurality of tracks obtained by simultaneous navigation in different colors or line types depending on the sea state.