Principles Of Radar

Front 1

Radar waves travel in what kind of lines, and how does this influence target detection at different altitudes?

Back 1

Straight lines; as the earth is round, this means that aircraft that are further away must be at a higher altitude to be detected by a ground sensor.

Front 2

What basic radar component coordinates all equipment functions so the system functions as a single unit?

Back 2

The synchronizer/timer

Front 3

What function does the duplexer perform?

Back 3

Allows the use of a single antenna to both transmit and receive radio waves.

Front 4

What component shapes and directs the electromagnetic energy?

Back 4

The antenna

Front 5

What component forms the initial radar pulse?

Back 5

The modulator

Front 6

Of the three resolutions that comprise the resolution cell, which Is not affected by range?

Back 6

Range resolution

Front 7

To be processed as two separate returns in the same line of bearing, how far apart must the two targets be?

Back 7

Greater than 1/2 PW

Front 8

What is the ability of a radar to separate targets for measurement called?

Back 8

Resolution

Front 9

For radars, what are the three axes that resolution is combined into called?

Back 9

Height, width, depth

Front 10

What is a resolution cell?

Back 10

The three axes (height, width, depth) that form a cube which dictates a radar's maximum ability to break out individual objects from each other.

Front 11

What are the three components of a resolution cell?

Back 11

Azimuth, height, range resolution

Front 12

What is the ability of a radar to discriminate between two targets that are at the same range from the radar but on different lines of bearing called?

Back 12

Azimuth Resolution

Front 13

What is the ability of a radar to discriminate between two targets that are the same range and azimuth to the radar but at different heights or altitudes called?

Back 13

Height resolution

Front 14

What will determine the radars azimuth Resolution?

Back 14

Horizontal beam width

Front 15

What will determine the radars height resolution?

Back 15

Vertical Beam Width

Front 16

What is the main advantage and disadvantage of pulse modulated radars?

Back 16

PM radars have very high range accuracy but poor target velocity accuracy.

Front 17

How do Doppler effect radars measure velocity?

Back 17

They measure the frequency shift between the sent radar wave and the received echo

Front 18

What is the greatest disadvantage or weakness of both Doppler effect and PD Radars?

Back 18

The duplexer allows the use of a single antenna to both transmit and receive radio waves.

Front 19

Describe the Doppler clutter notch?

Back 19

If targets are traveling at or near right angles to a PD of Doppler effect radars they will not generate a frequency shift and will therefore not be detected.

Front 20

What is the primary application of electro optical sensor systems?

Back 20

To visually identify the target

Front 21

Why do IRST systems require LRF?

Back 21

This passive system cannot determine range by itself and it must be provided by the FCR or LRF

Front 22

What radar system is always transmitting a single wave, transmits and receives simultaneously, and constantly illuminates the target which allows a receiver equipped missile to home on?

Back 22

Continuous Wave radar system

Front 23

What radar system uses a method of range measurement to separate the transmitted signal into short bursts with correspondingly long rest periods, has a short recovery time, longer listening time, simplifies range measurement by separating transmit period from receive period, , and the receiver determines the range to the target?

Back 23

Pulse Modulated

Front 24

This type of EA attempts to raise the overall level of noise so that the signal/noise ratio is the same is called what?

Back 24

Noise jamming

Front 25

This type of EA is designed expressly to deny the use of frequencies over wide spectrums of the electronic spectrum.

Back 25

Barrage jamming

Front 26

This type of EA if performed fast enough can make it appear that a number of frequencies are being jammed simultaneously.

Back 26

Sweep jamming

Front 27

This type of jamming is used to generate false targets and targets the radar operator versus the radar system itself.

Back 27

Deception jamming

Front 28

What are the two jamming categories?

Back 28

Noise and Deception

Front 29

This EA expendable is designed to assist in the penetration of a radar network and as a short term defense against tracking radars.

Back 29

Chaff

Front 30

This EA expendable mimics the launching aircrafts electronic emissions.

Back 30

Radar decoys

Front 31

This EA expendable targets IR guided weapons.

Back 31

Flares

Front 32

This is the current IFF/SIF protocol and system used world wide.

Back 32

The transponder

Front 33

Of the four components of the IFF/SIF system this one remains on the aircraft.

Back 33

Coder

Front 34

Of the four components of the IFF/SIF system which one selects a request from one the four available modes?

Back 34

Mode 1

Front 35

Which mode is used to identify an area of operations?

Back 35

Mode 2