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tilt settings and ground clutter suppression, allowing the radar to protect
against thunderstorm vaulting (♦page 5-15) while simultaneously
viewing weather at far greater ranges than is currently possible. The
upper beam looks along the aircraft flight path during climb out to
protect against thunderstorm vaulting while the lower beam uses a
lower than traditional tilt angle to view short and intermediate range
weather (figure 4-22).
1st Edition, 1st Revision
18 Sep 03 4-23
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
Figure 4-22 MultiScan Low Altitude Operation
Figure 4-23 Extended Range Weather Example
1st Edition, 1st Revision
4-24 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Automatic Operation
STRATEGIC WEATHER OUT TO 320 NM
Because MultiScan is able to select the best tilt angle for weather
detection, then eliminate the ground clutter through digital signal
processes, the radar is able to skim the radar horizon (see figure 4-75)
and automatically provide a strategic weather picture out to 320 NM.
Figure 4-24 shows how MultiScan utilizes a tilt angle that skims the radar
horizon in order to be able to detect long range weather (♦page 4-79).
Figure 4-24 MultiScan Tilt for Long Range Scan
In figure 4-25, MultiScan clearly shows a line of thunderstorms out to
300 NM. Note the dog leg in the storm just beyond 160 NM that is only
visible on the 320 NM range scale.
1st Edition, 1st Revision
18 Sep 03 4-25
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
Figure 4-25 MultiScan 320 NM Strategic Weather Display
SIMULTANEOUS DISPLAY UPDATES IN ALL RANGE/MODE
COMBINATIONS
MultiScan updates all cockpit displays simultaneously even when
different ranges and modes are selected by the captain and first
officer. The display is updated every four seconds for all modes except
windshear, which is updated every 5.5 seconds. The result is rapid and
continuous update of all weather information.
1st Edition, 1st Revision
4-26 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Automatic Operation
MODES OF OPERATION
WX (WEATHER MODE)
WX (Weather) Mode (figures 4-26 and 4-27) enables display of weather
targets without turbulence information. When in MultiScan AUTO
Mode, the Weather display will essentially be free of ground clutter, thus
enabling rapid and accurate interpretation of weather hazards.
Figure 4-26 Airbus WX Control
Figure 4-27 Boeing WX Control
1st Edition, 1st Revision
18 Sep 03 4-27
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
In figure 4-28, WX (weather) mode is selected. The four colors
displayed (black, green, yellow, red) represent different storm intensities
(♦page 4-35). Note that GCS (ground clutter suppression) has been
activated (i.e., MultiScan is operating in the fully automatic mode) and
that the weather display is essentially free of ground clutter.
Figure 4-28 Weather Mode (WX) Typical Display
WX+T (WEATHER PLUS TURBULENCE MODE)
WARNING
Doppler turbulence detection relies on the presence of at least light
precipitation. It is not capable of detecting clear air turbulence.
WX+T (Weather Plus Turbulence) Mode enables display of weather
targets with turbulence information overlaid on the display. Turbulence
will be displayed in magenta out to 40 nautical miles (figure 4-31) for
all selected ranges (figure 4-32). When in the MultiScan AUTO Mode,
the Weather plus Turbulence display will be essentially free of ground
clutter, which enables rapid and accurate interpretation of weather
hazards.
1st Edition, 1st Revision
4-28 18 Sep 03
COLLINS MULTISCAN OPERATION
MultiScan™ Radar MultiScan Automatic Operation
Figure 4-29 Airbus WX+T Control
Figure 4-30 Boeing WX+T Control
N NOTE
Turbulence may be displayed on the black background color in
areas where green levels of precipitation are not present.
1st Edition, 1st Revision
18 Sep 03 4-29
MULTISCAN OPERATION COLLINS
MultiScan Automatic Operation MultiScan™ Radar
N NOTE
“Improved Turbulence” has been incorporated into the MultiScan
radar. Improvements to the turbulence algorithm yield fewer false
alerts and human factors improvements yield a more readable
display.
Figure 4-31 depicts weather plus turbulence displayed on the 40 NM
range scale. Five colors are present: black, green, yellow, red and
magenta (♦page 4-35). Magenta indicates turbulence (♦page 4-35,
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Collins Weather Radar operator’s guide(15)
