"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"
"R" to "Ra", "Re" to "Rz"
RADAR: An acronym for Radio Detection And Ranging.
RADAR ALTIMETER: Airborne radar that measures the distance of the aircraft above the ground.
RADAR BEAM: The space in front of a radar antenna where a target can be effectively detected or
tracked.
RADAR CROSS SECTION: A measure of the radar reflection characteristics of a target. It is equal to the power
reflected back to the radar divided by power density of the wave striking the target. For most targets, the radar cross section
is the area of the cross section of the sphere that would reflect the same energy back to the radar if the sphere were substituted. RCS of sphere is independent of frequency if operating in the far field region.
RADAR DETECTOR. A detector that, in its simplest form, only needs to be capable of producing an
output when RF energy (reflected from a target) is present at its input.
RADAR DISTRIBUTION SWITCHBOARD. An electrical switching panel used to connect inputs from
any of several radars to repeaters (indicators).
RADAR MILE: Time interval (12.36 microseconds) for rf energy to travel out from a radar to a target
and back to the radar; radar nautical mile.
RADAR RANGE EQUATION: The radar range equation is a basic relationship which permits the calculation of received echo signal strength, if certain parameters of the radar transmitter, antenna, propagation path, and target are known.
RADAR TEST SET. A combination of several test circuits and equipment used to test various
characteristics of a radar.
RADIO FREQUENCY INTERFERENCE: See RFI.
RANGE: The length of a straight line between a radar set and a target.
RANGE CELL: In a radar, a range cell is the smallest range increment the radar is capable of detecting. If a radar has a range resolution of 50 yards and a total range of 30 nautical miles (60,000 yds), there are: 60000/50 = 1,200 range cells.
RANGE GATE: A movable gate used to select radar echoes from a very short-range interval. A gate voltage used to select radar echoes from a very short range interval.
RANGE GATE PULL OFF (RGPO): Deception technique used against pulse tracking radars using range gates.
Jammer initially repeats the skin echo with minimum time delay at a high power to capture the AGC circuitry. The delay is progressively increased, forcing the tracking gates to be pulled away ("walked off") from the target echo. Frequency memory loops (FML's), or transponders provide the variable delay.
RANGE-HEIGHT INDICATOR. A radar display on which slant range is shown along the X axis and
height along the Y axis.
RANGE RATE: The rate at which a radar target is changing its range with respect to the radar (in feet per second for example). Note that this rate is not the same as target velocity unless the target is moving straight toward or straight away from the radar.
RANGE RESOLUTION: Ability of a radar to distinguish between targets that are close together.
RANGE SCOPE: See A-Scope or PPI.
Radar Scope Display
Next set of R terms; "Re" to "Rz"
