JPH06342057A - Gps ship navigation system - Google Patents

Abstract

PURPOSE:To enhance the accuracy of a marine traffic monitoring operation by a method wherein each ship is provided with a GPS receiver, the position of an own ship is transmitted to a control station and positions of other ships are received from the control station and then displayed. CONSTITUTION:Radio waves from each GPS satellite are received by a GPS antenna 11 and a GPS reception part 12, received waves are processed, the absolute position of an own ship is measured, and a measured position is sent to a TDM device 14 and a CPU 15 via an interface circuit 13. According to a data transmission signal format based on a reference signal from a control station, the TDM device 14 allocates position data on an own ship, a discrimination signal and information on a GPS satellite in an empty slot which has been allocated, and they are modulated in a transmitter and transmitted from a transmission-reception antenna 16. Other ships perform the same processing operation, information, from the other ships, which has been received by a receiver 19 via the transmission-reception antenna 16 is separated into pieces of information on the individual ships by the TDM device 14, and the pieces of information are input to the CPU 15. The CPU 15 takes into the pieces of information, and it displays 20 them together with position data on the own ship. Thereby, precise information on a traffic monitoring operation can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marine surveillance system, and more particularly to a ship navigation system utilizing position information by a GPS (Global Positioning System) positioning device.

[0002]

2. Description of the Related Art Generally, there are few effective information transmission methods for marine traffic monitoring in ship navigation, and there is a problem in the accuracy of position measurement, so it is much more difficult than other traffic control systems. But the maintenance is not progressing. Currently VHF
The maritime security is only maintained by the provision of information, traffic restrictions, and setting of separate routes for passage. From this, while obtaining accurate position information of own ship during ocean navigation, and by acquiring the position information of other ships, the position of each ship can be grasped and maritime traffic monitoring can be carried out to prevent fog and storms. There is a need for a ship navigation system that can prevent marine disasters and prevent collisions at sea, and can set optimal routes.

In order to construct such a ship navigation system, it is necessary to have a technique for obtaining position information of the own ship and a technique for obtaining position information of another ship. Regarding a technique for obtaining accurate position information of the own ship, for example, Japanese Patent Application Laid-Open No. 63-187174 discloses a highly accurate ship current system using a complex positioning system that combines a radio rangefinder and a GPS positioning system. Techniques for measuring position are described. In addition, a technique using a Doppler radar is used to measure the position of another ship that is navigating the surrounding sea.
Japanese Patent No. 294988 discloses a technique for accurately measuring the position, movement, speed, and movement direction of another ship navigating around by a Doppler radar.

[0004]

As described above, various techniques for obtaining the position information of the own ship and other ships have been proposed in the past, and the position information of the own ship is enhanced by the GPS positioning system as described above. Although accurate positioning is possible, the Doppler radar, which obtains the position information of other vessels, transmits detection pulses to other vessels and uses the reflected waves that return from other vessels. Easily affected by the vibration of
There is a problem in terms of accuracy. Therefore, the mutual position between the own ship and another ship cannot be accurately grasped, and it is difficult to realize highly accurate marine traffic monitoring. An object of the present invention is to provide a GPS ship navigation system that enables highly accurate marine traffic monitoring.

[0005]

The ship navigation system of the present invention comprises a plurality of ships, GPS satellites, and a control station. Each ship uses GPS satellites to measure the position of its own ship. Means, means for transmitting measured position data at a timing controlled by the control station, means for receiving a signal transmitted from another ship, and extracting position data of the other ship from the signal, own ship, and And means for displaying the positions of the own ship and the other ship based on the position data of the other ship. Here, the control station, and the position data of each of the plurality of vessels,
A data transmission signal format based on a reference signal is set so that an identification signal obtained by encoding information on the size and registration of a ship and GPS satellite information used for position measurement are time-division multiplexed between each ship. In addition, the transmitting means in each vessel follows the data transmission signal format transmitted from the control station and fills the empty slot with position data of its own vessel, an identification signal, and a G signal.
A TDM device for allocating PS satellite information to empty slots is provided. Similarly, the receiving means in each vessel includes a TDM device that time-divisionally separates the position data, identification signal, and GPS satellite information of each vessel from the signal received based on the data transmission signal format transmitted from the control station.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a conceptual diagram showing an example of the ship navigation system of the present invention, which is configured as a system for communicating position information by GPS positioning system with each other to monitor the sea. That is, the GPS using the four GPS satellites S1, S2, S3, S4 whose three-dimensional satellite positions are known from the orbit information is used, and the radio waves transmitted from these GPS satellites S1, S2, S3, S4 are used. From the arrival time of, the ships F1 and F2 measure the accurate geographical position of their own ship. In addition, each vessel is equipped with a marine monitoring device, and data can be transmitted and received between them via the control station C.

FIG. 2 is a block diagram of a marine monitoring device mounted on the ships F1 and F2. GPS satellites S1, S2, S are received by the GPS receiving unit 12 through the GPS receiving antenna 11.
Radio waves from S3 and S4 are received, and the absolute position on the ship's geographical area is measured by a known processing method. The measured position data is transmitted to the T via the interface circuit 13.
DM (Time Division Multiplex) device 14 and CPU
15 is sent. On the other hand, the transmission / reception antenna 16 is connected to a transmitter 18 and a receiver 19 via a separator 17, and the transmitter 18 and the receiver 19 transmit / receive a signal to / from a control station C, and the transmission / reception signal is transmitted as described above. Input and output to the TDM device 14. Further, the CPU 15 is connected to a display 20 composed of a CRT (cathode ray tube), an LCD (liquid crystal) or the like. A power supply 21 and a controller 22 are provided to supply power and control the above-mentioned respective parts.

As shown in FIG. 3, the TDM device 14 follows the data transmission signal format based on the reference (synchronization) signal transmitted from the control station C, and the position data of the own ship in the empty slot and the own ship's position data. A process is performed in which the identification signal obtained by encoding the size and ship registration information and the GPS satellite information used for position measurement are assigned to the empty slots and transmitted from the transmitter 18. In addition, the position data of another ship included in the signal from the control station received by the receiver 19, the identification signal, the GP used
Processing for extracting the S satellite information and sending it to the CPU 15 is performed. The CPU 15 digitally processes the position data of the other ship, the identification signal, and the GPS satellite information from the TDM device 14 and sends them to the display device 20 to display the position of the other ship.
Further, the position data of the own ship measured by the GPS receiving section 12 is also input to the CPU 15, and similarly digital image processing is performed so that the display on the display 20 is performed.

Next, the operation of marine traffic monitoring in the ship navigation system configured as described above will be described. For example, in the ship F1, the GPS antenna 11 and the GPS
The reception unit 12 receives radio waves from the respective GPS satellites S1, S2, S3, S4, and measures the absolute position of the ship on the geographical point by a known processing method. The position data obtained by this measurement is sent to the TDM via the interface circuit 13.
It is sent to the device 14 and the CPU 15. TDM device 14
Then, as shown in FIG. 3, according to the data transmission signal format based on the reference signal transmitted from the control station C,
Position data, an identification signal, and GPS satellite information of the own ship are assigned to the assigned empty slot (slot 1 here), and the transmitter / receiver antenna 1 modulates this by the transmitter 18.
Send from 6. This operation is similarly performed on the other ship, here the ship F2, and the position data, identification signal,
GPS satellite information is assigned and transmitted.

On the other hand, the position data, the identification signal, and the GPS satellite information from the other ship, which are received and demodulated by the receiver 19 through the transmission / reception antenna 16, are input to the TDM device 14 and transmitted from the control station C here. The information received based on the reference signal is separated as information for each ship, extracted, and input to the CPU 15. In the CPU 15, the ship F2 obtained by using the same satellite as the GPS satellite used when the position data of the own ship is obtained based on the obtained identification signal of the other ship, here the ship F2, and the GPS satellite information. Position data and an identification signal are captured, digital image processing is performed, and the result is sent to the display 20. At the same time, GP
Position data of own ship measured by S satellite is also CPU15
Then, the digital image processing is performed and the image is sent to the display device 20.
As a result, the display device 20 displays the position of the ship F1 on the display surface and the position of the ship F2 on the display surface, as shown in FIG. At the same time, the size of the ship F2, ship registration information, etc. F2 'can be displayed. If the display 20 is provided with a memory or the like and the display operation is performed over time, the navigation loci F1 ″ and F2 ″ of the own ship and the other ship can be displayed together as shown in FIG. Become.

Also, in the control station C or a monitoring station (not shown), the received signals are separated by TDM and displayed based on the obtained information of a plurality of ships, so that the position of each ship and other Information can be displayed collectively,
Navigation monitoring can be performed. Here, although the above description shows the case where there is one other ship, as shown in FIG.
The slot based on the reference signal transmitted from the control station is configured as a large number of slots, and the control station allocates the slots to each of the large number of vessels so that the positions of a plurality of other vessels can be simultaneously displayed on the display. it can. In this case, by controlling the TDM device 14 and the CPU 15, only the information of the desired other ship is fetched from the received signal,
It is also possible to display only the selected other ship.

[0012]

As described above, according to the present invention, the position of the own ship is measured by using the GPS satellite, the position data is transmitted at the timing controlled by the control station, and the signal is transmitted from another ship. The GPS satellite is constructed so as to receive the position information of the other ship from this signal and display the position of the own ship and the other ship based on the position data of the own ship and the other ship. Positional data obtained from highly accurate positioning is communicated between multiple ships, and the position of your ship and the position of other ships navigating around can be displayed on the same screen, preventing collisions at sea and thick fog. It is very useful for preventing marine accidents and rescue during stormy weather, and also makes it easy to set optimal routes that avoid crowded waters. In addition, the control station and the like also have the effect of being able to monitor coastal waters and control the harbor.
Further, the position data of each ship can be communicated in a time-division multiplexed manner between each ship, so that the position data of many ships can be communicated with a small number of channels. Furthermore, each ship transmits and receives the position data of its own ship, and an identification signal that encodes the size and registration information of the ship and the GP used for position measurement.
By transmitting / receiving the S satellite information, it is possible to display the size, the ship registry, etc. of another ship, and it is possible to display the position with high accuracy by using the position data using the same GPS satellite.

[Brief description of drawings]

FIG. 1 is a diagram showing a concept of a system of the present invention.

FIG. 2 is a block configuration diagram of a monitoring device provided in each ship.

FIG. 3 is a data transmission signal format diagram based on a reference signal transmitted from a control station.

FIG. 4 is a diagram showing a display state of an own ship and another ship on a display device.

[Explanation of symbols]

 F1, F2 Ship C Control station S1 to S4 GPS satellite 12 GPS receiver 14 TDM device 15 CPU 18 Transmitter 19 Receiver 20 Display

Claims (4)

[Claims] 1. A means comprising a plurality of vessels, GPS satellites, and a control station, said vessel having means for measuring the position of its own vessel using the GPS satellites, and the measured position data controlled by the control station. Means for transmitting at the specified timing, means for receiving a signal transmitted from another ship, and extracting position data of the other ship from the signal, own ship and other ship based on the position data of own ship and other ship A GPS ship navigation system comprising: means for displaying the position of the ship. 2. The control station time-divisionally distributes position data of each of a plurality of ships, an identification signal obtained by encoding size and ship registration information of the ship, and GPS satellite information used for position measurement between the ships. The GPS ship navigation system according to claim 1, wherein a data transmission signal format based on a reference signal is set so as to be multiplexed. 3. The transmitting means comprises a TDM device for allocating the ship's position data, identification signal, and GPS satellite information to an empty slot according to the data transmission signal format transmitted from the control station. GPS ship navigation system. 4. The receiving means comprises a TDM device for time-divisionally separating the position data, identification signal, and GPS satellite information of each ship from the received signal based on the data transmission signal format transmitted from the control station. 2 GPS ship navigation system.