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weather. The result is superior weather detection at all ranges in all
phases of flight.
True 320 NM weather and OverFlight™ Protection are two of several
new unique features of the MultiScan Radar. The ability of the MultiScan
to eliminate ground clutter with advanced algorithms allows it to skim
the radar horizon and provide pilots with true strategic weather out to
320 NM. OverFlight™ Protection allows crews to avoid inadvertent
thunderstorm top penetrations, which today account for a significant
portion of aircraft turbulence encounters. OverFlight™ Protection
ensures that any thunderstorm that is a threat to the aircraft will remain
on the radar display until it no longer poses a danger to the aircraft.
SYSTEM DESCRIPTION
KEY OPERATING FEATURES
Advanced Features include:
• Fully Automatic Operation: MultiScan is designed to work in the
fully automatic mode. Pilots select only the desired range. Tilt and
gain inputs are not required (♦page 4-12).
1st Edition, 1st Revision
18 Sep 03 2-1
OVERVIEW COLLINS
System Description MultiScan™ Radar
• Essentially Clutter Free Display: Rockwell Collins’ third generation
ground clutter suppression algorithms are utilized to eliminate
approximately 98% of ground clutter resulting in the display of threat
weather that is essentially free of ground clutter (♦page 4-14).
• Optimized Weather Detection At All Ranges And Altitudes:
Weather data from multiple scans at varying tilt angles is stored in
memory. When the flight crew selects a desired range, information
from the various scans is extracted from memory and merged on
the display. Since both long and short range weather information
is available due to the use of multiple tilt angles, the display
presentation represents an optimized weather picture regardless of
the aircraft altitude or the range scale selected (♦page 4-22).
• Strategic Weather: MultiScan provides true 320 NM strategic
weather information (♦page 4-25).
• Gain PLUS™: Gain Plus incorporates the following functions:
• Conventional Increase and Decrease of Gain Control:
MultiScan allows the flight crew to increase and decrease gain
during both manual and automatic operation (♦page 4-35).
• Variable Temperature Based Gain: Variable temperature based
gain automatically compensates for low thunderstorm reflectivity
during high altitude cruise (♦page 4-38).
• Path Attenuation Compensation and Alert (PAC Alert):
Compensation for attenuation due to intervening weather is
provided within 80 NM of the aircraft. When compensation limits
are exceeded, a yellow PAC Alert bar is displayed to warn the
flight crew of an area of radar shadow (♦page 4-39).
• OverFlight™ Protection: OverFlight protection reduces the
possibility of inadvertent thunderstorm top penetration at high
cruise altitudes. MultiScan’s lower beam information and memory
capability are utilized to prevent thunderstorms that are a threat
to the aircraft from disappearing from the display until they pass
behind the aircraft (♦page 4-40).
• Oceanic Weather Reflectivity Compensation™: MultiScan
automatically compensates for the reduced reflectivity of oceanic
thunderstorms to provide a more accurate weather presentation
during over water operations (♦page 4-43, ♦page 5-16).
1st Edition, 1st Revision
2-2 18 Sep 03
COLLINS OVERVIEW
MultiScan™ Radar System Description
• Comprehensive Low Altitude Weather: The use of multiple tilt
angles at low altitude allows the radar to protect against vaulted
thunderstorm energy by scanning along the aircraft flight path, scan
for growing thunderstorms beneath the aircraft, and view weather at
extended ranges (♦page 4-23).
• Windshear Detection: Automatic forward looking windshear
detection is provided in that landing and take off environment (♦page
4-45).
• Ground Mapping: Ground mapping mode enables the detection of
major geographical features such as cities, lakes and coast lines
(♦page 4-34).
• Split Function Control (Boeing Aircraft): Split function control
provides the captain and first officer with independent control of
range, gain and mode of operation. When operating in manual mode,
independent tilt control is also available (♦page 4-2).
• Simultaneous Display Updates in All Range/Mode Combinations:
The captain’s and first officer’s displays update simultaneously
during automatic operation even when different ranges and modes
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本文链接地址：
Collins Weather Radar operator’s guide(8)
