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35 Cards in this Set
- Front
- Back
Radar waves travel in what kind of lines, and how does this influence target detection at different altitudes? |
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. |
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What basic radar component coordinates all equipment functions so the system functions as a single unit? |
The synchronizer/timer |
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What function does the duplexer perform? |
Allows the use of a single antenna to both transmit and receive radio waves. |
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What component shapes and directs the electromagnetic energy? |
The antenna |
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What component forms the initial radar pulse? |
The modulator |
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Of the three resolutions that comprise the resolution cell, which Is not affected by range? |
Range resolution |
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To be processed as two separate returns in the same line of bearing, how far apart must the two targets be? |
Greater than 1/2 PW |
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What is the ability of a radar to separate targets for measurement called? |
Resolution |
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For radars, what are the three axes that resolution is combined into called? |
Height, width, depth |
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What is a resolution cell? |
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. |
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What are the three components of a resolution cell? |
Azimuth, height, range resolution |
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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? |
Azimuth Resolution |
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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? |
Height resolution |
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What will determine the radars azimuth Resolution? |
Horizontal beam width |
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What will determine the radars height resolution? |
Vertical Beam Width |
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What is the main advantage and disadvantage of pulse modulated radars? |
PM radars have very high range accuracy but poor target velocity accuracy. |
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How do Doppler effect radars measure velocity? |
They measure the frequency shift between the sent radar wave and the received echo |
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What is the greatest disadvantage or weakness of both Doppler effect and PD Radars? |
The duplexer allows the use of a single antenna to both transmit and receive radio waves. |
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Describe the Doppler clutter notch? |
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. |
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What is the primary application of electro optical sensor systems? |
To visually identify the target |
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Why do IRST systems require LRF? |
This passive system cannot determine range by itself and it must be provided by the FCR or LRF |
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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? |
Continuous Wave radar system |
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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? |
Pulse Modulated |
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This type of EA attempts to raise the overall level of noise so that the signal/noise ratio is the same is called what? |
Noise jamming |
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This type of EA is designed expressly to deny the use of frequencies over wide spectrums of the electronic spectrum. |
Barrage jamming |
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This type of EA if performed fast enough can make it appear that a number of frequencies are being jammed simultaneously. |
Sweep jamming |
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This type of jamming is used to generate false targets and targets the radar operator versus the radar system itself. |
Deception jamming |
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What are the two jamming categories? |
Noise and Deception |
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This EA expendable is designed to assist in the penetration of a radar network and as a short term defense against tracking radars. |
Chaff |
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This EA expendable mimics the launching aircrafts electronic emissions. |
Radar decoys |
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This EA expendable targets IR guided weapons. |
Flares |
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This is the current IFF/SIF protocol and system used world wide. |
The transponder |
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Of the four components of the IFF/SIF system this one remains on the aircraft. |
Coder |
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Of the four components of the IFF/SIF system which one selects a request from one the four available modes? |
Mode 1 |
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Which mode is used to identify an area of operations? |
Mode 2 |