Definitions in the Radar Field
"A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
"N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"

"S" to "Sensi", "Senso" to "Spoi", "Spok" to "Sz"

S-Band: A range of frequencies between 2000MHz and 4000MHz. Also see the table of Radar Bands.

Scan: To transverse or sweep a sector or volume of airspace with a recurring pattern, by means of a controlled directional beam from a radar antenna. See also Antenna, nutating. The graphic shows a radar screen, scanning.

Radar Scan Display Console
Radar Scan

Scanning: Systematic movement of a radar beam to cover a definite pattern or area in space.

Scan Rate: Text in review.

Scattering: Of a wave propagating in a material medium, a phenomenon in which the direction, frequency, or polarization of the wave is changed when the wave encounters discontinuities in the medium, or interacts with the material at the atomic or molecular level.

Scattering Loss: The part of the transmission (power) loss that results from scattering within a transmission medium or from roughness of a reflecting surface.

Schottky Barrier Diode: The Schottky barrier diode is a simple metal-semiconductor boundary with no P-N junction. A depletion region between the metal contact and the doped semiconductor region offers little capacitance at microwave frequencies. This diode finds use as detectors, mixers, and switches. [Diode Manufacturers]

Schottky Diode Mixer: The mixer is a critical component in modern RF systems. Any nonlinear element can perform the mixing function, but parameters determining optimal mixing are noise figure, input admittance, and IF noise and impedance. The Schottky diode is particularly effective because of its low noise figure and nearly square law characteristics. RF Mixer Manufacturers

Schottky Diode Switch: Standard P-N diodes are limited in switching ability at high frequencies because of capacitance provided by the minority carriers. The Schottky diode overcomes this problem by use of the metal-semiconductor junction with inherently low carrier lifetimes, typically less than 100 picoseconds.

Scintillation. Apparent change in target reflectivity. Motion of the target causes successive radar pulses to bounce off different parts of the target, such as fuselage and wingtip. In electromagnetic wave propagation, a small random fluctuation of the received field strength about its mean value.

Search Radar: A radar whose prime function is to scan (search) a specified volume of space and indicate the presence of any targets on some type of visual display, and, in some cases, to provide coordinates of the targets to a fire control system to assist in target acquisition and tracking.

Second-Sweep Echoes: See Ambiguous Returns.

Secondary Radar: A radio-determination system based on the comparison of reference signals with radio signals retransmitted from the position to be determined.

Seeker: The seeker consists of circuitry in a homing missile which detects, electronically examines, and tracks the target; provides data for controlling the flight path of the missile; and provides signals for destroying the missile or for detonating it at intercept. (The seeker function is similar to that of an interferometer.)

Self-Synchronized Radar: A type of radar in which the timing pulses are generated within the transmitter.

Sensitivity: The sensitivity of a receiver is taken as the minimum signal level required to produce an output signal having a specified signal-to-noise ratio.

PC motherboard

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