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Any echo detected on the radarscope and not evaluated as clutter or as a false echo. Although the term contact is often used interchangeably with target, the latter term specifically indicates that the echo is from an object about which information is being sought.



Related Terms

RAIN CLUTTER

Clutter on the radarscope which is the result of the radar signal being reflected by rain or other forms of precipitation.

D.S.C.

1) Digital Selective Calling system using digital codes which enables a radio station to establish contact with, and transfer information to, another station or group of stations. 2) Dangerous goods, solid cargoes and containers.

ECHO

  1. A wave which has been reflected or otherwise returned with sufficient magnitude and delay to be perceived. 2. A signal reflected by a target to a radar antenna. Also called RETURN. 3. The deflection or indication on a radarscope representing a target. Also called PIP, BLIP, RETURN.

RADARSCOPE

The cathode-ray tube or video monitor in the indicator of a radar set which displays the received echo to indicate range and bearing. Often shortened to SCOPE.

SEA RETURN

Clutter on the radarscope which is the result of the radar signal being reflected from the sea, especially near the ship. Also called SEA CLUTTER.

SECOND-TRACE ECHO

A radar echo received from a target after the following pulse has been transmitted. Second-trace echoes are unusual except under abnormal atmospheric conditions, or conditions under which super-refraction is present, and are received from targets at actual ranges greater than the radar range scale setting. They may be recognized through changes in their position on the radarscope on changing the pulse repetition rate; their hazy, streaky or distorted shape; and their erratic movements on plotting. Also called MULTIPLE-TRACE ECHO.

DSC

Digital Selective Calling a technique using digital codes which enable a radio station to establish contact with, and transfer information to, another station or group of stations

CLUTTER

Unwanted radar echoes reflected from heavy rain, snow, waves, etc., which may obscure relatively large areas on the radarscope

MULTIPLE ECHOES

Radar echoes which may occur when a strong echo is received from another ship at close range. A second or third or more echoes may be observed on the radarscope at double triple, or other multiples of the actual range of the radar target, resulting from the echo’s being reflected by own ship back to the target and received once again as an echo at a multiple of the preceding range to the target. This term should not be confused with MULTIPLE-TRACE ECHO.

ECHO-SPLITTING RADAR

Radar in which the echo is split by special circuits associated with the antenna lobe-switching mechanism, to give two echo indications on the radarscope screen; when the two echo indications are equal in height, the target bearing is read from a calibrated scale.

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