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,
A-Scan and B-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.
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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. For a prf of 2 KHz the display
would be triggered 2000 times per second showing that number of signal traces.
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SPx provides options for PPI, A-Scan and B-Scan display. You can see PPI and A-Scan in the
demonstration software that's available from Cambridge Pixel. Click on the image to show
a version at 1280 x 1024.
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