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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.
ALTAIR (ARPA Long-Range Tracking And Instrumentation Radar) is a radar tracking station on Roi-Namur island in the north part of the Kwajalein atoll in the Marshall Islands. It is a high-sensitivity, wide-bandwidth, coherent, instrumentation and tracking radar that is capable of collecting precise measurements on small targets at long-ranges.
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.
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 AN/FPS-12 radar permitted surveillance of the general vicinity of the DAMP ship as well as vectoring of aircraft which may be assigned to the ship. The telemetry acquisition system was a passive acquisition aid operated on the interfereometer principle which gives angular position of the target relative to the ship.
Daniel Pallota, a consultant the city hired to manage ARPA projects, told city council he wants to make sure all land issues are settled before spending money on design.
The AN/SPS-67 is a solid-state replacement for the AN/SPS-10 radar, using a more reliable antenna and incorporating standard electronic module technology for simpler repair and maintenance. The AN/SPS-67 provides excellent performance in rain and sea clutter, and is useful in harbor navigation, since the AN/SPS-67 is capable of detecting buoys ...