Page 53/62
Rev. A
2017-12-04
SCANTER 1002 Radar System
User’s Manual
1255194-HO
Radar Cell The disc around the radar out to the maximum range is
covered by a polar grid. Each azimuth sector is divided
into 4096 range cells of equal range depth. A specific
range cell in a specific azimuth sector is called a radar cell.
Radar Cross Section The Radar Cross Section (abbreviated RCS) is the size
and ability of a target to reflect RF energy - this is summa-
rized in a single term, which has the dimension [m
2
]. The
size of the RCS depends on frequency, antenna polarisa-
tion and a lot of characteristics of the target, ex. physical
dimensions, aspect angle, coating and material, surface.
The RCS can be quite difficult to estimate and is normally
determined by measurements and in certain extend expe-
rience.
Radial Speed The true velocity of an air plane is composed of three vec-
tors. The vector, which points directly towards the radar or
away from the radar, represents the radial speed of the air
plane. Assuming, an air plane is flying around the radar in
a circle path, the radial speed will be permanently zero.
The produced Doppler frequency is zero and the air plane
is not detected.
Resolution The minimum distance in range or angle between two
equally strong radar targets (same radar cross section)
which allow the echoes from these targets to be perceived
as separate echoes.
Scan The collection of consecutive sweeps covering one full
rotation.
Sea Clutter Discrimi-
nation
Sea Clutter Discrimination (abbreviated SCD) performs
sliding window scan-to-scan correlation for each range-
azimuth cell. This is used to discriminate between clutter
and targets.
Sweep The radar return of one transmitted pulse as a function of
range.
Track The track of a target is a table holding position, speed,
course, etc. versus time.
Tracking Tracking is the process of associating a time series of
plots with the physical movement of one physical object
(the target) and to derive speed, course etc. from this time
series.
Track update A track is updated when a plot from the most recent scan
is associated to a tentative or a confirmed track.
Trail Historic radar echoes, usually presented in a color differ-
ent from the actual radar echoes and fading away within a
user defined time interval.
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