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Marine radars are X band or S band radars on ships, used to detect other ships and land obstacles, to provide bearing and distance for collision avoidance and navigation at sea. They are electronic navigation instruments that use a rotating antenna to sweep a narrow beam of microwaves around the water surface surrounding the ship to the horizon ...
Radar ranges and bearings can be very useful for navigation. Radar navigation is the utilization of marine and aviation radar systems for vessel and aircraft navigation.When a craft is within radar range of land or special radar aids to navigation, the navigator can take distances and angular bearings to charted objects and use these to establish arcs of position and lines of position on a ...
Rule 5 – Look-out. [6] This rule concerns the keeping of a proper lookout to sea. [6] It involves keepinmg the lookout by all available means, including audible means, visual means and by the use of marine radar. [6] Rule 6 – Safe Speed. Rule 7 – Risk of Collision. Rule 8 – Action to Avoid Collision.
A marine radar with automatic radar plotting aid (ARPA) capability can create tracks using radar contacts. [1] The system can calculate the tracked object's course, speed and closest point of approach [2] (CPA), thereby knowing if there is a danger of collision with the other ship or landmass. Development of ARPA started after 1956, when the ...
The automatic identification system (AIS) is an automatic tracking system that uses transceivers on ships and is used by vessel traffic services (VTS). When satellites are used to receive AIS signatures, the term Satellite-AIS (S-AIS) is used. AIS information supplements marine radar, which continues to be the primary method of collision ...
Mini-automatic radar plotting aid (or MARPA) is a maritime radar feature for target tracking and collision avoidance. Targets must be manually selected, but are then tracked automatically, including range, bearing, target speed, target direction (course), CPA (closest point of approach), and TCPA (time of closest point of approach), safe or dangerous indication, and proximity alarm.
The pulse width ( ) (or pulse duration) of the transmitted signal is the time, typically in microseconds, each pulse lasts. If the pulse is not a perfect square wave, the time is typically measured between the 50% power levels of the rising and falling edges of the pulse. The pulse width must be long enough to ensure that the radar emits ...
Download as PDF; Printable version; ... Marine radar; S. Sea-based X-band Radar; SMART-L; SMART-S Mk2; T. Type 342 Radar; Type 343 Radar; Type 344 radar; Type 346 ...