Sensitivity time control
From Infogalactic: the planetary knowledge core
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Sensitivity time control (STC) is used to attenuate the very strong signals returned from nearby ground clutter targets in the first few range gates of a Radar receiver. Without this signal attenuation, the receiver would routinely saturate due to the strong signals. This is used in air traffic control systems, and has an influence of the shape of the elevation pattern of the survailance antenna.
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