Radar Scan Conversion Formats
Radar Scan Conversion is the process that converts radar
video from a range-azimuth format into an alternate coordinate system that makes it
easier to visualise. There are a number of common
display formats for the display of radar video, including PPI, B-Scan and A-Scan.
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PPI Display Mode
The PPI (Plan Position Indicator) view displays the radar as if looking at a plan
view of its coverage. It shows a rotating sweep that corresponds to the movement
of the antenna. The view shown has the radar at the centre, so the coverage of the
radar is represented by a circle. A portion of the display can be selected for a
zoom view, a process known as off-centering.
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B-Scan Display Mode
Typically used in fire-control situations, the B-Scan mode shows range against azimuth.
As the radar rotates, the display updates across the display from left to right.
The B-Scan view to the left is showing the same test pattern as the PPI view above.
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A-Scan Display Mode
In A-Scan (or A-Scope), the data is displayed as a signal strength of amplitude
against time (equivalent to range) for each return. The display is what you'd see
if you connected the radar video to an oscilloscope. The A-Scan view to the left
is showing the same test pattern and the PPI and B_Scan views above.
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