Lecture 6-RADAR Part 2

February 6, 2019 | Author: zuliana | Category: N/A
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Lecture 6 RADAR Part II

By: Zuliana Ismail,2010

Introduction Home

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Recall Back RADAR Part 1

 What are the three types of RADAR?  What are the differences between PSR and SSR?  How PSR wor works? ks?  How SSR wor works? ks?

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Spirit stealth bomber of the U.S Air Force

WHY ¶STEALTH· AIRCRAFT  CAN BE INV  ISIBLE ??

An F-117 Nighthawk stealth strike aircraft

F-22 Raptor

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Most

conventional aircraft have a rounded shape. This shape creates a very efficient radar reflector.. Means that no matter where the radar reflector signal hits the plane, some of the signal gets reflected back

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F-22 Raptor

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Spirit stealth bomber of the U.S Air Force

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An F-117 Nighthawk stealth strike aircraft

However, some military aircraft are designed and constructed to be non-reflective - the so-called stealth aircraft.

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A stealth aircraft is made up of completely flat surfaces and very sharp edges. edges. When a radar signal hits a stealth plane, the signal reflects away at an angle. Surfaces on a stealth aircraft also can absorb radar energy as well. So, this aircraft become invisible. invisible.

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AIRBORNE WEATHER RADAR (AWR) 2.

Introduction Home

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 Airborne Weather Radar (AWR) (AWR) is used to provide to provide the pilots about weather ahead.  The installation installation include weather radar antenna antenna located in the nose of the aircraft and weather radar display inside the cockpit.  The radar radar information information can be displayed displayed in combination with with the aircraft route on the EFIS Navigation Display (ND)  Weather radar is used for severe weather avoidance

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The antenna is housed in a radome made of composite materials located located in the nose of the aircraft.

How  Airborne Weather Radar Works Home

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 A antenna which sweeps side to side side transmits transmits Super High Frequency (SHF) signals which is 9Ghz  When hit the reflective reflective objects (precipitation), (precipitation), the signals is reflected back to the antenna receiver.  The returns (echo) are displayed to the pilot on the aircrafts radar screen.

Precipitation

 Weather Weather radar is function to detect, locate, and measure the amount of precipitation.

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 Precipitation is within or falling from cloud.  It includ includes es rain, snow, ice & hail.  Different precipitation has different reflective levels.

Airborne Weather Radar Works Home

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 The goal of weather radar is to display areas of  heavy precipitation, which generally indicates areas of turbulence.  Different types of precipitation have different different reflective qualities.  Reflectivity of precipitation precipitation is directly related to moisture content.  Large water droplets show the strongest strongest returns, while dry hail or snow will w ill show light returns, or no returns at all.  Weather radar detects detects raindrops, not clouds or fog.

Airborne Weather Radar Works Home

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 The precipitation painted (depicted) by airborne weather radar radar is not of primary concern, however it is representative of areas of severe weather.  Areas of large raindrop size=high rainfall rate=intense storm=turbulence storm=turbulence..  The turbulence associated with convective convective clouds is often severe and always dangerous.  Other dangerous factors associated with thunderstorms are: severe icing, hail, lightning, strong downdrafts.

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CAUT  ION: weather radar emits harmful radiation, it should not be operated when people are standing within 50 feet of  radome or during refuelling. Home

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