L-scope radar display

Autor/Urheber:

US Navy, Radar Bulleting No. 2A, United States Government Printing Office Washington: 1946

Shortlink:

https://www.dewiki.de/b/22b6fb

Quelle:

Wikimedia Commons

Größe:

588 x 527 Pixel (66769 Bytes)

Beschreibung:

This image shows a typical "L-scope" radar display. This example is taken from the ASB radar system, used by US Navy aircraft to search for ships on the ocean. The equivalent UK designs are known as ASV and first introduced this style of radar display.

The L-scope is a modified version of the original A-scope display, showing the returns of the same signal as seen from two antennas. This allows the signal strength of the two images to be compared directly by examining the length of the "blip" on either side of the centreline, the target would be positioned closer to the antenna receiving the stronger return.

This image shows two target blips, one at about 4.75 miles range and another at about 3 miles. The closer target is smaller, which accounts for the shorter blip in spite of it being closer. It is also seen only on the right side of the display, indicating that the target is located far to the right of the aircraft. The further target is larger and centred dead ahead.

The centreline is not sharp due to the presence of noise, which was known as "grass" in US parlance. The triangular shaped blip at the very bottom of the screen is caused by reflections off the ocean surface, and obscure targets as the aircraft approaches within several miles.

Lizenz:

Public domain

Credit:

http://www.ibiblio.org/hyperwar/USN/ref/RADTWOA/RADTWOA-2.html#principles

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