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What Is Radar
Beginning of essay
The word "radar" was invented by scientists of the United States Navy
during World War II. The word comes from the first letters in the term
"radio detection and ranging.""Detection," as used here, means finding an
object or target by sending out a radio signal that will bounce back off
the target ....
Middle of essay
....nciple of the echo.
How Radar Works
Radar sets produce radio signals. They radiate(send out) these
signals into space with a transmitter.
When a radio signal strikes an object such as an airplane, part of the
signal is reflected back to the radar antenna. The signal is picked up
there as a radar echo. A radar set changes the radar echo into an image
that can be seen on a screen. A radar set also gives the direction of the
target and its distance from the set. How Radar Began
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| Number of words: 2203 |
Approximate pages: 9 |
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