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US-12621014-B2 - Ship information exchange device, ship information exchange method and ship information exchange program

US12621014B2US 12621014 B2US12621014 B2US 12621014B2US-12621014-B2

Abstract

A ship information exchange device capable of reducing a demodulation processing load is provided. The ship information exchange device includes a receiver, a generator, a detector, and a demodulator. The receiver receives a radio signal. The generator generates reception data of a plurality of channels used for transmission of ship information based on the radio signal. The detector detects a reception level of each of the channels. The demodulator demodulates the reception data. The demodulator determines the reception data to be demodulated according to the detection result of the reception levels.

Inventors

  • Daisuke Kimura

Assignees

  • FURUNO ELECTRIC CO., LTD.

Dates

Publication Date
20260505
Application Date
20240930
Priority Date
20220331

Claims (16)

  1. 1 . A ship information exchange device, comprising: a receiver configured to receive a radio signal; a generator configured to generate reception data of a plurality of channels used for transmission of ship information based on the radio signal; a detector configured to detect a reception level of each of the channels; and a demodulator configured to demodulate the reception data and determine the reception data to be demodulated according to the detection result of the reception levels.
  2. 2 . The ship information exchange device of claim 1 , wherein the demodulator determines the number of channels used for the transmission of the ship information based on the detection result, and determines the reception data to be demodulated based on the determination result.
  3. 3 . The ship information exchange device of claim 2 , wherein the detector further detects a reception level at a frequency of a boundary between adjacent channels.
  4. 4 . The ship information exchange device of claim 3 , wherein, when the reception level of a first channel is a given value or more, and the reception level at a frequency of a boundary between the first channel and a second channel adjacent to the first channel is below the given value, the demodulator demodulates the reception data of the first channel.
  5. 5 . The ship information exchange device of claim 3 , wherein when the reception levels of the first channel and the second channel that are channels of successive frequency bands are the given value or more, and the reception level at the frequency of the boundary between the first channel and the second channel is below the given value, the demodulator demodulates the reception data of the first channel and the reception data of the second channel.
  6. 6 . The ship information exchange device of claim 4 , wherein when the reception levels of the first channel and the second channel that are channels of successive frequency bands are the given value or more, and the reception level at the frequency of the boundary between the first channel and the second channel is below the given value, the demodulator demodulates the reception data of the first channel and the reception data of the second channel.
  7. 7 . The ship information exchange device of claim 3 , wherein, when the reception levels of the first channel and the second channel that are channels of successive frequency bands are the given value or more, and the reception level at the frequency of the boundary between the first channel and the second channel is the given value or more, the demodulator demodulates synthesized data obtained by synthesizing the reception data of the first channel and the reception data of the second channel.
  8. 8 . The ship information exchange device of claim 6 , wherein, when the reception levels of the first channel and the second channel that are channels of successive frequency bands are the given value or more, and the reception level at the frequency of the boundary between the first channel and the second channel is the given value or more, the demodulator demodulates synthesized data obtained by synthesizing the reception data of the first channel and the reception data of the second channel.
  9. 9 . The ship information exchange device of claim 3 , wherein, when each of the reception levels of channels of a plurality of successive frequency bands is the given value or more, and the reception level at the frequency of each of the boundaries between the adjacent channels is the given value or more, the demodulator demodulates synthesized data obtained by synthesizing the reception data of the channels of the plurality of successive frequency bands.
  10. 10 . The ship information exchange device of claim 8 , wherein, when each of the reception levels of channels of a plurality of successive frequency bands is the given value or more, and the reception level at the frequency of each of the boundaries between the adjacent channels is the given value or more, the demodulator demodulates synthesized data obtained by synthesizing the reception data of the channels of the plurality of successive frequency bands.
  11. 11 . The ship information exchange device of claim 3 , wherein the demodulator determines the reception data to be demodulated based on a comparison result of the reception level of the channel with a first threshold, and a comparison result of the reception level at the frequency of the boundary with a second threshold different from the first threshold.
  12. 12 . The ship information exchange device of claim 10 , wherein the demodulator determines the reception data to be demodulated based on a comparison result of the reception level of the channel with a first threshold, and a comparison result of the reception level at the frequency of the boundary with a second threshold different from the first threshold.
  13. 13 . The ship information exchange device of claim 1 , wherein the ship information includes at least any one of an identification code, a name, a position, a course, a velocity, and a destination of the ship.
  14. 14 . The ship information exchange device of claim 12 , wherein the ship information includes at least any one of an identification code, a name, a position, a course, a velocity, and a destination of the ship.
  15. 15 . A ship information exchange method in a ship information exchange device, comprising: receiving a radio signal; generating reception data of a plurality of channels used for transmission of ship information based on the radio signal; detecting a reception level of each of the channels; determining the reception data to be demodulated according to the detection result of the reception levels; and demodulating the determined reception data to be demodulated.
  16. 16 . A non-transitory computer-readable recording medium storing a program causing a processor of a device to execute processing, the processor configured to control operation of the device, the processing comprising: receiving a radio signal; generating reception data of a plurality of channels used for transmission of ship information based on the radio signal; detecting a reception level of each of the channels; determining the reception data to be demodulated according to the detection result of the reception levels; and demodulating the determined reception data to be demodulated.

Description

CROSS-REFERENCE TO RELATED APPLICATION(S) This application claims priority under 35 U.S.C § 119 to Japanese Patent Application No. 2022-058446, which was filed on Mar. 31, 2022, the entire disclosure of which is hereby incorporated by reference. TECHNICAL FIELD The present disclosure relates to a ship information exchange device, a ship information exchange method, and a ship information exchange program. BACKGROUND ART Conventionally, a technique for transmitting and receiving ship information, such as ship identification codes between ships is known. The ship information is transmitted and received through a channel of a given frequency band, and is demodulated in a receiving device. However, the conventional technique may increase the demodulation processing load of the device which received the ship information, and may cause data loss due to the demodulation not performed in time. SUMMARY OF THE DISCLOSURE The present disclosure is made in order to solve the above-described problem, and one purpose thereof is to provide a ship information exchange device, a ship information exchange method, and a ship information exchange program, which are capable of reducing the demodulation processing load. (1) In order to solve the above-described problem, a ship information exchange device according to one aspect of the present disclosure includes a receiver, a generator, a detector, and a demodulator. The receiver receives a radio signal. The generator generates reception data of a plurality of channels used for transmission of ship information based on the radio signal. The detector detects a reception level of each of the channels. The demodulator demodulates the reception data. The demodulator determines the reception data to be demodulated according to the detection result of the reception levels. The configuration in which the reception data to be demodulated is determined according to the reception levels of the plurality of channels is capable of selectively demodulating the reception data including the ship information, compared with the configuration in which the reception data included in the radio signals of all channels are demodulated sequentially and repeatedly in a time-divided fashion regardless of whether the ship information is included in the radio signals. Thus, it is capable of suppressing the increase in the processing load when demodulating the reception data which does not include the ship information, thereby accelerating the responses of various processings in the demodulator. Therefore, it is capable of reducing the demodulation processing load and reducing the processing cost and product cost for the demodulation. (2) The demodulator may determine the number of channels used for the transmission of the ship information based on the detection result, and determine the reception data to be demodulated based on the determination result. (3) The detector may further detect a reception level at a frequency of a boundary between adjacent channels. (4) When the reception level of a first channel is a given value or more, and the reception level at a frequency of a boundary between the first channel and a second channel adjacent to the first channel is below the given value, the demodulator may demodulate the reception data of the first channel. (5) When the reception levels of the first channel and the second channel that are channels of successive frequency bands are the given value or more, and the reception level at the frequency of the boundary between the first channel and the second channel is below the given value, the demodulator may demodulate the reception data of the first channel and the reception data of the second channel. (6) When the reception levels of the first channel and the second channel that are channels of successive frequency bands are the given value or more, and the reception level at the frequency of the boundary between the first channel and the second channel is the given value or more, the demodulator may demodulate synthesized data obtained by synthesizing the reception data of the first channel and the reception data of the second channel. (7) When each of the reception levels of channels of a plurality of successive frequency bands is the given value or more, and the reception level at the frequency of each of the boundaries between the adjacent channels is the given value or more, the demodulator may demodulate synthesized data obtained by synthesizing the reception data of the channels of the plurality of successive frequency bands. (8) The demodulator may determine the reception data to be demodulated based on a comparison result of the reception level of the channel with a first threshold, and a comparison result of the reception level at the frequency of the boundary with a second threshold different from the first threshold. (9) The ship information may include at least any one of an identification code, a name, a position, a course, a velocity, and a d