RADAR

Introduction

Radar = RAdio Detection And Ranging

Object-detection system that uses radio waves to determine the range, altitude, direction, or speed of objects

Can be used to detect aircraft, ships, spacecraft, guided missiles, motor vehicles, weather formations, and terrain

Secretly developed by several nations before and during World War II.

Background of Radar

1886 : Hertz showed reflection of radio signal from solid object

1904 : German inventor Christian Hülsmeyer was the first to use radio waves to detect "the presence of distant metallic objects“

He demonstrated the feasibility of detecting a ship in dense fog

Basic Principle of Radar

Uses Of Radar 1

Long-range radar antenna, used to track space objects and ballistic missiles.

Radar of the type used for detection of aircraft. It rotates steadily sweeping the airspace with a narrow beam.

Uses Of Radar 2

Used in Military purposes Detect Aircraft, ships, missiles

Used in Aircrafts

Marine Radars

Used in port or harbors

Used in meteorology and geology purposes

Analyse weather formations and terrain

Modern Uses Air traffic control radar astronomy air-defense systems antimissile systems aircraft anti-collision systems ocean surveillance systems outer space surveillance guided missile target locating systems

Radar Can Measure Pressure

The strength of the echo received from the ionosphere measures the number of electrons able to scatter radio waves or what we call electron pressure

Advantages of Radar

Penetration Capability Uses electromagnetic wave Less susceptible to weather conditions Flexible – can be used in number of ways Reliable

Disadvantages of Radar

Time factorWide beam spreadPossibility of falsify readings Interference sources

Stealth Aircrafts

US Air force B2-Spirit

US Air Force F-117 Nighthawk

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