Ad
related to: arpa radar plotting aid
Search results
Results From The WOW.Com Content Network
A typical shipboard ARPA/radar system. A marine radar with automatic radar plotting aid (ARPA) capability can create tracks using radar contacts. [1] [2] The system can calculate the tracked object's course, speed and closest point of approach [3] (CPA), thereby knowing if there is a danger of collision with the other ship or landmass.
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 fuel and lubricant oil consumption are 4% less than in a comparable ship. Her bridge equipment includes an Automatic Identification System (AIS), GPS, Differential GPS (dGPS), an Automatic Radar Plotting Aid (ARPA), and an Electronic chart system (ECDIS) for automatically plotting the ship's position against charts. Computerized systems ...
Radar plotting with the use of an EBL and VRM, or the ARPA should be used to determine the information of movement and the risk of collision of other ships in vicinity. [4] Information given to the user includes bearing, distance, CPA (closest point of approach) and TCPA (time of closest point of approach).
The radar measures the distance to the reflector by measuring the time of the round trip from emission of a pulse to reception, dividing this by two, and then multiplying by the speed of light. To be accepted, the received pulse has to lie within a period of time called the range gate .
The bridge equipment consists of GPS, dGPS, Automatic Identification System (AIS) and Automatic Radar Plotting Aid (ARPA), which usually allows the position of the ship to be plotted with an accuracy of 100 metres (330 ft).
The BridgeMaster II series followed, with a Motorola 68000 CPU and software options like vector traces showing the trajectories of other ships as part of the automatic radar plotting aid package. A Decca BridgeMaster II display being used to test a prototype video isolator.
The main purpose for radar and automatic radar plotting aid (ARPA) on a ship's bridge are to move safely among other vessels. These tools help to accurately judge information about prominent objects in the vicinity, such as range, bearing, course and speed;