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Navigational Radar
Components of
A typical surface radar set is made up of five components.
RADAR
Component
Description of Function
Transmitter
Sends out electromagnetic waves of energy.
Modulator
Allows waves to be omitted as pulses.
Beams the energy at the targets and rotates to scan
Antenna
the surrounding area.
Receiver
Converts the reflected radio energy returned from the
target into usable data.
Indicator
Presents the data received visually on a scope.
How RADAR
Works
The following stages help to explain how radar operates:
Plan Position
The PPI scope provides a bird’s-eye view of the area covered by the
Indicator (PPI)
radar with your ship in the center. The sweep appears as a bright line
and originates in the center of the scope and extends to the outside edge.
This straight line sweep is synchronized with the radar antenna and
rotates 360°. Each time a target is detected, it appears as an intensified
spot on the scope. See figure 8-31.
8-47
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