The present invention provides navigation assistance that is for small ships and that enables clear depiction of a radar image. An administrative server in a ship navigation assistance system, the server being equipped with: a communication means that performs, via a network, data transmission/reception with a user terminal which is connected to a device for detecting a target; and a vertex information management means that, of a plurality of target vertices extracted on the basis of detection result information of the target, identifies vertices moving together as a group as belonging to the same target, wherein, on the basis of the vertices that have been identified as belonging to the same target, the communication means transmits an instruction to the user terminal to display a rough outline of said target.

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.

Generally, the present disclosure relates to a forward deployed sensor system or, in a specific embodiment, a forward deployed radar (FDR) system. The forward deployed sensor system includes a radar system and may also include other types of sensors such as optical sensors, acoustic sensors including sonar, and electromagnetic sensors. Further, the forward deployed sensor system may also include a communication system such as a full spectrum receiver/transmitter, a ship to ship relay transponder, a satellite communication system, and global positioning system (GPS) capability. The forward deployed sensor system is able to detect objects in the air, on the sea, and underwater, and communicate such detection to a ship, submarine, aircraft, satellite, or other remote location. Such systems may be used to augment the protection of shipping lanes by military or security forces to allow for peaceful commerce and utility of the sea by all nations.

The patent provides the system and the method of evaluation the centroid range-bearing processing in high resolution coastal surveillance radars to solve the problem of assessing the quality of centroid processing. The provided system includes blocks: Input data block, parameter calculation block, evaluation and export result block; The provided method includes steps: Loading input data, calculating parameters, evaluating and exporting results. The system and method provided in this invention solve the issue of the quality assessment of the radar system according to the battle-technical specification at the target centroid level.

Upon each new detection, called pivot detection, by a radar system, the method includes the steps consisting of: grouping together, with the pivot detection, grouped detections, defined as detections that belong to a sweep preceding the sweep of the pivot detection and that have a non-nil probability according to a grouping criterion; filtering the grouped detections so as to keep only detections that are kinematically strictly coherent with the pivot detection, by: initializing a histogram, each dimension of which is a temporal variation of a coordinate measured by the radar system; computing a potential value interval for each coordinate of the pivot detection and each grouped detection; computing a minimum temporal variation and a maximum temporal variation for the or each coordinate from potential value intervals of the pivot detection and each grouped detection; incrementing the set of classes of the histogram whose index along each dimension is located between the computed minimum and maximum temporal variations; and detecting a target once at least one class of the histogram reaches a predefined value.

A maritime radar system is provided, comprising a transmitter, a receiver, and one or more processors arranged to provide range and azimuth discrimination of a detection area by performing a delay/Doppler analysis of the echo of a single beam transmitted by the transmitter and received by the receiver.

A maritime radar system is provided, comprising a transmitter, a receiver, and one or more processors arranged to provide range and azimuth discrimination of a detection area by performing a delay/Doppler analysis of the echo of a single beam transmitted by the transmitter and received by the receiver.

An aircraft includes a vessel checker, an image generator, an appearance determining unit, and an information transmitter. The vessel checker identifies a suspicious vessel candidate by comparing a marine vessel detected by a marine search radar with a marine vessel transmitting data with an automatic identification system. The image generator generates an image by photographing the suspicious vessel candidate after the aircraft approaches the suspicious vessel candidate in accordance with a route for approaching the suspicious vessel candidate. The appearance determining unit determines whether the suspicious vessel candidate in the image has an appearance characteristic of a suspicious vessel. The information transmitter transmits, to an external apparatus, information indicating that the suspicious vessel candidate has the appearance characteristic of the suspicious vessel if the suspicious vessel candidate has the appearance characteristic of the suspicious vessel.

The present disclosure relates to a system and a method for monitoring vessel traffic information. The system for monitoring vessel traffic information includes: an interlock device configure to adjust identification information of a wireless terminal included in a received message to correspond to an identification system of auto identification system (AIS) message and convert the received message into a AIS message type, when receiving a message including ship information from a wireless terminal of a ship located in at least one ship network; a merging device configure to merge the ship information included in the converted AIS message with radar image information; and a monitoring device configure to display merged monitoring information on a monitoring screen.

Disclosed herein are an apparatus and method for extracting ocean wave information. The apparatus for extracting ocean wave information includes a radar image reception unit for receiving a radar image from a radar antenna, a digital conversion unit for converting the received radar image into a digital format, an analysis preparation unit for setting analysis sections of the radar image and performing temporal accumulation on the analysis sections, a three-dimensional (3D) spectrum-conversion unit for converting accumulated analysis sections into a 3D spectrum in a 3D frequency domain by performing a temporal/spatial 3D Fast Fourier Transform (FFT) on the accumulated analysis sections, and an ocean wave information extraction unit for extracting ocean wave information based on the 3D spectrum.