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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.
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.
Square Pair – fire control radar of the SA-5 system; Square Tie – surface search radar for small combatants and cruise missile target designation. [1] Chinese type 352. [2] Squat Eye – alternate target acquisition radar of the SA-3 system; Steel Yard – The Duga over-the-horizon radar; Straight Flush – fire control radar of the SA-6 system
AN/SPQ-9A (sometimes pronounced as "spook nine") is a United States Navy multi-purpose surface search and fire control radar used with the Mk-86 gun fire-control system (MK86 GFCS). It is a two dimensional surface-search radar, meaning it provides only range and bearing but not elevation. It is intended primarily to detect and track targets at ...
The United States military unleashed a wave of attacks targeting radar sites operated by Yemen's Houthi rebels over their assaults on shipping in the crucial Red Sea corridor, authorities said ...
The radar provides the following capabilities: air target tracking of over 200 targets out to 150 km [2] surface target tracking of over 150 targets out to 32 km [2] horizon search out to 75 km [2] "limited" volume search out to 150 km [2] (in order to back up the volume search capabilities of the SMART-L)
The SPY-6 system consists of two primary radars and a radar suite controller (RSC) to coordinate the sensors. An S-band radar is to provide volume search, tracking, ballistic missile defense discrimination, and missile communications, while the X-band radar is to provide horizon search, precision tracking, missile communication, and terminal illumination of targets. [6]
[a] This radar system was determined to be too large for use in the FRAM program for WWII-era destroyers undergoing modernization. The SPS-40, which used numerous off-the-shelf parts, was proposed as an alternate by BUSHIPS as a suitable radar design for the FRAM program. The CNO directed procurement, in advance of service approval, on 10 March ...