Radar is an instrument that uses microwaves to detect distant objects by measuring the echo of pulses. During World War II, countries rushed to develop radar systems for military use. Britain was a leader in radar development before the war and built radar stations around the country to detect incoming aircraft. There were two main types of radar used in WWII - detection radars to map surrounding areas and detect objects, and fire control radars to precisely locate targets to allow guns to hit targets that couldn't be seen directly. Early radar displays were like electronics lab equipment, but the PPI display, showing a rotating beam and target locations, became more useful for operators. Radar has since been developed for navigation and now has applications beyond military and weather

1. radar By: Mariana Mata and Inés Arimany

2. WHAT IS It ? Measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects.

4. Britain’s built radar stations around the British Isles to provide warning of aerial invasion. http://www.youtube.com/watch?v=0SPlmvIPv3g

5. WWII AND RADAR From military point of view two types of radar were used for detection and for fire control.

6. Used to create a radar map of all objects in all directions and often as far as possible. Used for purposes such as: 1 early warning (detection of aircraft and ships) DETECTION RADARS ground controlled intercept of aircraft (done by directing fighter aircraft to detect incoming aircraft) mapping (mapping of the ground terrain for navigation and targeting mostly by bombers)

7. Radar equivalent of a searchlight. 2 In WWII mostly night fighters used fire control radars. ★ Firecontrols They are dedicated to the precise position of a previously detected particular target, ✓ to guide the operator to aim guns at the target and hit it without actually seeing it. ★

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9. DEVELOPED PROJECTS Initially radars were equipped with display devices like an electronics lab. http://www.youtube.com/watch?v=YTi_518ruI0 LATER… more operationally useful devices were invented, particularly the PPI (Plan Position Indicator) which is the familiar radar display which is a circular display that shows a beam which rotates with the rotating radar antenna and marks with light the positions of defected targets relative to their range. Radar signals could also be used for navigation. (Ship or airplane)

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