Abstract: The present disclosure provides a ship monitoring system capable of improving legibility of an OZT. The ship monitoring system includes a first data generator, a second data generator, and processing circuitry. The first data generator generates first ship data indicative of a position and a velocity of a first ship. The second data generator generates second ship data indicative of a position and a velocity of a second ship. The processing circuitry calculates a risk value indicative of a risk of a collision between the first ship and the second ship based on the first ship data and the second ship data, for each point on an estimated course of the second ship, when the first ship is assumed to change a course and reach the point. The processing circuitry specifies a range where two or more continuous points have the risk values above a threshold. The processing circuitry displays a risk range including the range where the two or more continuous points have the risk values above the threshold.

Abstract: A ship monitoring system has a first data generator that generates first ship data indicative of a position and a velocity of a first ship. The second data generator generates second ship data indicative of a position and a velocity of a second ship. The processing circuitry specifies a risk range where a ship area occupied by the first ship or a watch area set around the first ship overlaps with a ship area occupied by the second ship or a watch area set around the second ship, among an estimated course of the second ship, based on a position of the first ship and a position of the second ship at each timing, that are estimated from the first ship data and the second ship data, when assuming that the first ship changes a course to an arbitrary direction and crosses the estimated course of the second ship.

Abstract: The present disclosure provides a ship monitoring system which makes it easy for a user to grasp a change in a risk situation. The ship monitoring system includes a first data generator, a second data generator, processing circuitry, and an alarm sounding part. The first data generator generates first ship data indicative of a position and a velocity of a first ship. The second data generator generates second ship data indicative of a position and a velocity of a second ship. The processing circuitry calculates a risk value indicative of a risk of a collision between the first ship and the second ship based on the first ship data and the second ship data. The processing circuitry generates a discontinuous sound pattern with an interval according to the risk value. The alarm sounding part sounds an alarm according to the discontinuous sound pattern.

Abstract: An automatic steering device includes an acquirer, and processing circuitry. The acquirer acquires a traveling state including a heading or a position of a ship, and ship information on the ship. The processing circuitry calculates a first evaluation value that is an evaluation value indicative of a performance for maintaining the heading of the ship or a route based on the traveling state. The processing circuitry calculates a second evaluation value that is an evaluation value related to a ship handling control based on the ship information. The processing circuitry sets a control parameter related to a motion control of the ship based on the first evaluation value or the second evaluation value.

Abstract: A ship state including a rudder angle is estimated with high accuracy. A ship state estimator device is equipped with processing circuitry. The processing circuitry acquires an direction signal indicating an direction of a ship. The processing circuitry inputs the direction signal into a ship state estimator that outputs a ship state including a rudder angle, and estimates the ship state including the rudder angle.

Abstract: The present disclosure provides a ship monitoring system capable of visualizing a risk of a collision or an approach in a width direction perpendicular to a heading of another ship. The ship monitoring system includes a first data generator, a second data generator, and processing circuitry. The first data generator generates first ship data indicative of a position and a velocity of a first ship. The second data generator generates second ship data indicative of a position and a velocity of a second ship. The processing circuitry specifies a risk range where a risk value indicative of a risk of a collision between the first ship and the second ship is above a threshold among an estimated course of the second ship, based on a position of the first ship and a position of the second ship at each timing, that are estimated from the first ship data and the second ship data, when assuming that the first ship changes a course to an arbitrary direction and crosses the estimated course of the second ship.

Abstract: An apparatus for nautical tracking, where the apparatus detects at least one object. The apparatus further determines radar information associated with the at least one object, and calculates a first velocity vector associated with the at least one object. The apparatus further determines information associated with a tidal current of the water body, and calculates a second velocity vector based on the information associated with the tidal current. The apparatus further compares the first velocity vector and the second velocity vector in order to classify an object of the at least one object as a target, and further notifies a user of the target.

Abstract: The present disclosure provides a ship monitoring system capable of appropriately evaluating risks of collisions for a plurality of other ships which constitute a convoy. The ship monitoring system includes a first data generator, a second data generator, and processing circuitry. The first data generator generates first ship data indicative of a position and a velocity of a first ship. The second data generator generates a plurality of second ship data indicative of positions and velocities of a plurality of second ships. The processing circuitry calculates a risk value indicative of a risk of a collision between the first ship and each of the plurality of second ships based on the first ship data and the plurality of second ship data. The processing circuitry determines whether the plurality of second ships are a convoy based on the plurality of second ship data.

Abstract: An image generation device includes an image capturing unit installed on a water moving object, a target information acquisition unit which acquires target information about a target, an augmented image generation unit which generates an augmented image in which the target information acquired by the target information acquisition unit is displayed in a captured image captured by the image capturing unit, a marker display unit which displays a marker for selecting the target by a user such that the marker moves according to a display place of the target in the augmented image, and a marker moving unit moves the display place of at least one of a plurality of the markers so that determination regions which determining that each marker has been selected do not overlap each other.

Abstract: This positioning device comprises a delay correction amount setting unit and a pseudo-distance calculation unit. The delay correction amount setting unit sets a delay correction amount for an amount of delay from an antenna to a positioning device that occurs in a positioning signal being tracked. The pseudo-distance calculation unit calculates a pseudo-distance using a tracking result and the delay correction amount.

Abstract: According to the disclosure, an increase in costs is suppressed and the influence of main bang is reduced. A signal processing device includes a hardware processor programmed to at least: calculate a correction value of strength for each of distances from an antenna based on a received signal including a signal acquired by multiple transmissions and receptions via the antenna; and suppress a level indicated by received data generated based on the received signal for each of the distances by using the correction value for each of the distances.

Abstract: The purpose of this disclosure is to easily calculate draft information with a simple configuration. The draft information generation device (10) comprises multiple range-finding sensors (20) and an information processor module (30). The range-finding sensor (20) is mounted on the side of a vessel (80) and measures the distance to water surface (91) using a range-finding signal. The information processor module (30) calculates draft height Hdr using the distance to the water surface (91) and the mold depth Hmd of the vessel (80).

Abstract: An amplifier circuit to be used in a sonar is described. The amplifier circuit includes a transducer and a matching circuit. The transducer has an impedance characteristic having a resonance frequency and an anti-resonance frequency higher than the resonance frequency. The matching circuit is connected to the transducer. The impedance characteristic of the transducer connected to the matching circuit has a first resonance frequency and a second resonance frequency higher than the first resonance frequency.

Abstract: The purpose of the present disclosure is to set the initial information of the anchoring object (target) of a ship with high accuracy. A ship navigation assistance system according to the present disclosure includes a provisional initial information specifier, a measurement sensor and processing circuitry. The provisional initial information specifier may accept a specification of provisional initial information for characteristic information on an object to which a ship anchors or docks (docks to a pier). The measurement sensor may acquire measurement information on an object using a ranging result of an area including the object.

Abstract: This water vapor observation device comprises an antenna, an RF amplifier, and processing circuitry. The antenna receives radio waves radiated from an atmosphere including water vapor. The RF amplifier amplifies the received radio waves and generates an observation signal. The processing circuitry is programmed to at least: use the observation signal to select a plurality of observation frequencies excluding an accuracy degraded frequency; and calculate a water vapor index using the spectral intensities of the plurality of observation frequencies. This configuration makes it possible to accurately observe a water vapor amount.

Abstract: The purpose of the present disclosure is to suppress an error which occurs in movement, such as in anchoring a ship. A ship navigation assistance system includes a measurement sensor and a characteristic information updating module. The measurement sensor acquires measurement information on an object using a ranging result of an area including the object that is an anchorage target of a ship. The characteristic information updating module updates characteristic information on the object using initial characteristic information on the object or characteristic information before updating on the object, and the measurement information.

Abstract: A Doppler device including a transducer and processing circuitry is provided. The transducer transmits underwater ultrasonic wave and receives a reflected wave of the ultrasonic wave. The Doppler device generates a first echo signal from the reflected wave in a first direction making a depression angle ? with a receiving surface of the transducer, generates a second echo signal from the reflected wave in a second direction making the depression angle ? with the receiving surface, the second direction being different from the first direction, and generates a third echo signal in a third direction perpendicular to the receiving surface. The processing circuitry further calculates a first Doppler frequency of the first echo signal, a second Doppler frequency of the second echo signal, and a third Doppler frequency of the third echo signal. The processing circuitry further calculates the depression angle ? from the first, second and third Doppler frequencies.

Abstract: A stub tuner includes a first conductor, and a rod-shaped conductor shaft. The first conductor is inserted into a tube axial direction inner side from an opening in a waveguide tube transmitting high frequency waves. The first conductor includes a plate-shaped first shape extending in a direction intersecting a tube axial direction, inside the waveguide tube, and a plate-shaped second shape extending from the outer end in the tube radial direction of the first shape toward the tube axial direction outer side in the tube axial direction. An outer circumferential surface of the second shape is separated from an inner surface of the waveguide tube. An electrical length of the outer circumferential surface in the tube axial direction is ¼ of a wavelength of the high-frequency waves. The conductor shaft is electrically connected to the waveguide tube, supports the first conductor, and extends in the tube axial direction.

Abstract: A water vapor observation device includes a water vapor index acquisition module which acquires a water vapor index calculated based on radio wave intensities of at least two frequencies out of radio waves received by a microwave radiometer, a global navigation satellite system (GNSS) precipitable water vapor acquisition module which acquires a GNSS precipitable water amount calculated based on an atmospheric delay of a GNSS signal received by a GNSS receiver, a correlation data generation module which generates correlation data between the water vapor index and the GNSS precipitable water amount based on the water vapor index and the GNSS precipitable water amount at a plurality of time points during a predetermined period, and a precipitable water vapor calculation module which calculates a precipitable water amount based on the correlation data from the water vapor index obtained based on the microwave radiometer.

Abstract: A visibility determination system determines a visibility condition based on an image taken by a camera. The visibility determination system includes: an acquisition part, configured to acquire a first extracted image obtained by extracting an edge of an imaging target in a first image taken by the camera; and a determination part, configured to determine visibility based on the first extracted image and a second extracted image that is obtained by extracting the edge of the imaging target in a second image taken by the camera at a different time from the first image.