Theme II. RADAR

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detection - обнаружение reflect - отражать illumination - облучение determine - определять surveillance - наблюдение

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Radar is a device which measures the time between the transmission and reception of radio pulses and provides information on range, azimuth, and/or elevation of objects in the path of the transmitted pulses. ______The principles of radar are not new: in fact, some early experiments were made back in 1880s. In 1904 a German engineer had invented, as he explained, a «radio-echo collision prevention device». The word «radar» was originally derived from the descriptive phrase «Radio Detection and Ranging» _____Radar is a device that detects objects at a distance and determines how far the object is and in what direction it moves. The ability to detect a target at a great distances and to locate its position with relatively high accuracy is the chief characteristic of radar __ _ Radar operates by radiation of electromagnetic energy and by detection of the presence and character of the echo returned from reflecting objects. The application of radar in the air traffic control system consists of two basic designs. The initial type of radar, called primary radar, began to be used in most parts of the world in the early 1950s. Another form of radar, secondary surveillance radar (SSR) is used for advanced air traffic control. When the word «radar» is used alone, it usually includes both primary and secondary radar. _____There are three additional forms associated with primary and secondary radar which are interest; Radar Echo — the visual indication on display of a signal reflected from an object Radar Response - the visual indication on display of a radar signal transmitted from an object in reply to an interrogation. Radar Blip - the collective term meaning either echo or response.

Translate

at a great distances, radio-echo collision prevention device, chief characteristic, electromagnetic energy,initial type, ability to detect a target,primary and secondary radar,relatively high accuracy,additional forms,visual indication

Complete

1. Radar is used to …

2. A radar set include ….

3. The transmitter works like …..

4. The receiver operates like …..

5. Radar measures …….

Fill

a speed time radar screen high accuracy radiation source spot of light signals sharp beam radar regular intervals a distance radio waves weather conditions

1. Radar is a device that detects objects at …….. and determines how far the object is and in what direction it moves.

2. The ability to detect a target at great distances and to locate its position with relatively ….. is the chief characteristic of radar

3. The transmitter sends out radio waves at ….. 4. The transmitting antenna rotates at …… of 3 to б rpm for long — range systems, and as fast as 60 rpm for airport coverage. 5. The waves are concentrated into a….. 6. The radio waves hit an object the object reflects back part of the wave to the ….. 7. The reflected energy produces a bright «echo» or «target» on the ….. 8. The difference in time between these two …….helps to determine how far an object is 9. The bigger the difference in ……., the longer the distance to the object 10. Radar operates by …. of electromagnetic energy and by detection of the presence and character of the echo returned from the reflecting objects. 11. The …… can penetrate clouds and continue to move until they strike something solid 12. Radar sets can detect and locate moving targets in all …… 13. The pilot in the airplane equipped with ……, flying at night can see distant buildings, mountain peaks 14. The plane looks as a….. on the ground radar screen

Match

1. DESCENT	a. Movement of airplane on the ground using airplane engine power.
2. COMPUTER	b. А device that displays information.
3. TAXI	c. А mechanically driven device for producing alternating current for airplane electrical system.
4. SWITCH	d. A device that performs arithmetic operations, manipulates data, and makes decisions.
5. NAVIGATION	e. A device which measures the time between the transmission and reception of radio pulses and provides information on range, azimuth, and/or elevation of objects in the path of the transmitted pulses.
6. INDICATOR	f. Phase of flight where altitude is decreasing.
7. HERTZ	g. A device which changes the condition of an electrical system from on/off or open/close.
8. GENERATOR	h., A specific relationship between one number value and another.
9. RATIO	i. The art of determining the geographical position and maintaining desired direction of an aircraft relative to the earth’s surface.
10. RADAR	j. The unit of frequency in cycles реr second