The most basic type of scanning indicator is the

The most basic type of scanning indicator is the

• A. A-scan
• B. Plan Position Indicator (PPI)
• C. Raster
• D. C-scan

Answer: (A)

The most basic scanning indicator is the one that shows echoes as a simple range trace. It plots echo amplitude along a single vertical line, so you read distance to targets directly from the height of the spikes on the trace. This straightforward, one-dimensional representation makes it the simplest form of radar display, providing immediate range information without mapping direction or creating images. More advanced displays, like plan-position indicators, raster images, or constant-elevation slices, add azimuth, two-dimensional imaging, or cross-sectional views, but they build on and go beyond this fundamental, range-only presentation.

The most basic scanning indicator is the one that shows echoes as a simple range trace. It plots echo amplitude along a single vertical line, so you read distance to targets directly from the height of the spikes on the trace. This straightforward, one-dimensional representation makes it the simplest form of radar display, providing immediate range information without mapping direction or creating images. More advanced displays, like plan-position indicators, raster images, or constant-elevation slices, add azimuth, two-dimensional imaging, or cross-sectional views, but they build on and go beyond this fundamental, range-only presentation.