Quiz
SEMANA 21/05 A 28/05
Questions in this quiz (32)
1Q1. A long pulse can have the same bandwidth (resolution) as a short pulse if the long pulse is
modulated in:- Aa) Frequency or signal
- Bb) Frequency or phase
- Cc) Phase or signal
- Dd) Signal or time
2Q2. In order to improve the detection we use:
- Aa) Integration of pulses: technique that combines the returns of several pulses instead of
only 1 - Bb) Adaptive threshold: the noise is estimated using noise-only samples and the threshold
is replaced. - Cc) Frequency of the signal: The noise can be reduced by the spare time between signals.
- Dd) Aand B are correct.
- Aa) Integration of pulses: technique that combines the returns of several pulses instead of
3Q3. What information can give a primary surveillance radar?
- Aa) Distance and azimuth of targets.
- Bb) Meteorological information.
- Cc) A and B are correct
- Dd) The temperature of the engine.
4Q4. What information be given by a secondary surveillance radar?
- Aa) Distance, azimuth, altitude and velocity.
- Bb) Identification of targets and emergency scenarios.
- Cc) A and B are correct.
- Dd) None of above
5Q5. What are the most important advantages of radar Doppler?
- Aa) High accuracy
- Bb) Autonomous system
- Cc) Use of real wind instead of estimated wind.
- Dd) All of above
6Q6. About ARTS (Automated Radar Terminal System).
- Aa) Use to be inside aircrafts noise.
- Bb) Is the combination of a secondary surveillance radar (SSR) and Aerodrome
Surveillance Radar (ASR) - Cc) It is the cheapest kind of aircraft`s radar.
- Dd) None of above
7Q7. About Conical Scan in angle Tracking:
- Aa) It is a result of the development of the sequential lobbing technique.
- Bb) If the target is located off-bore sight, the receiver will receive an amplitude-modulated
signal at the conscan frequency. - Cc) One of its disadvantages is that due to the potential foes a break lock of the radar can
occur. - Dd) All of above are correct.
8Q8. What is the most used technique about angle tracking?
- Aa) Conical scan.
- Bb) Sequential lobing.
- Cc) Monopulse.
- Dd) None of above.
9Q1. Regarding pulse compression technique
- AA. A long pulse can have the same bandwidth (resolution) as short pulse if the long
pulse is modulated in frequency or phase. - BB. A long pulse can have the same bandwidth (resolution) as short pulse if the long
pulse is modulated just in frequency. - CC. A long pulse can have the same bandwidth (resolution) as short pulse if the long
pulse is modulated just in phase. - DD. A long pulse can not have the same bandwidth (resolution) as short pulse if the
long pulse is modulated in frequency or phase.
- AA. A long pulse can have the same bandwidth (resolution) as short pulse if the long
10Q2. Integration of pulses
- AA. This technique use the return from 1 pulse instead of several pulses.
- BB. This technique combines the returns from several pulses instead of only 1.
- CC. In this technique the noise is estimated using noise-only samples and the threshold
is replaced. - DD. Is not a technique to improve the detection.
11Q3. Types of improving the target detection
- AA. Integration of pulses
- BB. Adaptive threshold
- CC. A and B are true
- DD. A and B are false
12Q4. Primary surveillance radar
- AA. It gives distance and azimuth of targets.
- BB. It does not need on board equipment.
- CC. It can give meteorological information.
- DD. All are true.
13Q5. Secondary surveillance radar
- AA. It gives distance, azimuth, altitude and velocity.
- BB. It gives identification of targets.
- CC. It uses interrogator (ground based) and transponder (airbone).
- DD. All are true.
14Q6. Why doppler is important
- AA. Doppler lets you separate things that are moving from things that aren’t.
- BB. Doppler does not let you separate things that are moving from things that aren’t.
- CC. Doppler lets you know the temperature of the ground.
- DD. Doppler lets you know where is your house.
15Q7. Range tracking technique
- AA. Range gating
- BB. Sequential lobing
- CC. Conical scan (Conscan)
- DD. Amplitude comparison monopulse
16Q8. Angle tracking technique (chose the false)
- AA. Range gating
- BB. Sequential lobing
- CC. Conical scan (Conscan)
- DD. Amplitude comparison monopulse
17Q1. Which of the following is not a new element in doppler radars:
- AA. The radar data processor
- BB. The modulor task included in the transmitter
- CC. Synchroniser function integrated into the exciter and the RDP
- DD. Analogic Signal Modulator
18Q2. In relation with radar altimeter, choose the false one.
- AA. It determines the instantaneous altitude of the aircraft above the terrain over the
aircraft is flying. - BB. It makes use of the frequency modulated ranging.
- CC. The transmitted signal consists of a rectangular wave modulation.
- DD. The transmitted signal consists of a triangular wave modulation.
- AA. It determines the instantaneous altitude of the aircraft above the terrain over the
19Q3. The terrain following radar:
- AA. Scans the terrain ahead of it and receives ground returns that are used for
guidance. - BB. Scans the terrain ahead of it and receives airborne returns that are used for
guidance. - CC. Scans the terrain under it and receives airborne returns that are used for guidance.
- DD. Scans the terrain under it and receives ground returns that are used for guidance.
- AA. Scans the terrain ahead of it and receives ground returns that are used for
20Q4. The elements that compose a phased array:
- AA. Radiate in groups of 10
- BB. Radiate in groups of 5
- CC. Radiate in groups of 2
- DD. Radiate independently
21Q5. Related to phased array antennas, planar arrays: (choose the wrong answer)
- AA. Does not use electronic switching means to scan the beam
- BB. Use electronic switching means to scan the beam
- CC. Use phasing techniques embedded within the design of the antenna to form and
shape the beam - DD. Have lower scanning capabilities being less expensive than the ESA.
22Q6. Related to phased array antennas, ESA means:
- AA. Electronically Scanned Array
- BB. Electronically Surveillance Array
- CC. Electronically System Array
- DD. Electronically Shifter Array
23Q7. Related to Synthetic Aperture Radar, the quality of the radar depends on:
- AA. Its power.
- BB. Its efficiency, related with the gain of the antenna.
- CC. Its ability to resolve very closely espaced objects.
- DD. None of them.
24Q8. Which of the following are not a SAR MODE
- AA. Ground mapping
- BB. Spotlight Mode
- CC. Inverse SAR
- DD. Direct SAR
25Q1. In hyperbolic Navigation System, there are three possible outcomes:
- AA. The lines cross at almost 90º. This represents the most accurate fix.
- BB. The lines cross at a much more acute angle. The result is a larger error ellipse.
- CC. There are two possible solutions. An ambiguity exists that can only be resolved by using a
further station. - DD. All above are corrects.
26Q2. LORAN C means:
- AA. Long Range Navigation
- BB. Lost Range Navigation
- CC. Longitudinal Range Navigation System
- DD. Low Range Navigation
27Q3. LORAN C is:
- AA. A pulsed system with at least 4 stations: 2 Master + 2 slaves
- BB. A pulsed system with at least 3 stations: 1 Master + slaves
- CC. A pulsed system with at least 3 stations: 2 Master + 1 slaves
- DD. A pulsed system with at least 2 stations: 1 Master + 1 slave
28Q4. The GRI:
- AA. Means Group Repetition Interval and is unique for each LORAN chain
- BB. Means Ground Repetition Interval and is similar for each LORAN chain
- CC. Means Group Repetitive Interval Code and is unique for each LORAN chain
- DD. None of above.
29Q5. GNSS:
- AA. Offers a cheap and accurate navigational means to anyone who possesses a suitable
receiver. - BB. Means global navigation satellite systems
- CC. A and B are corrects
- DD. None of above
- AA. Offers a cheap and accurate navigational means to anyone who possesses a suitable
30Q6. GNSS has:
- AA. B and C are corrects
- BB. Three segments: control segment, space segment and user segment.
- CC. The space segment includes the satellite constellation, presently around 25 satellites that
forms the basis of the network. - DD. The control segment includes the satellite constellation, presently around 25 satellites that
forms the basis of the network.
31Q7. The baseline satellite constellation downlinks data in two bands:
- AA. L1 and L3 Navigation Signals
- BB. Only L1 Navigation Signals
- CC. L1 and L2 Navigation Signals
- DD. Only L3 Navigation Signals
32Q8. GNSS has:
- AA. Offset between UTC time and atomic clock at satellite
- BB. Offset between satellite and receptor clocks (tu)
- CC. Other: measurement from starting time
- DD. All above and for this reason a fourth satellite is needed.
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- Aviónica 4to parcial Quiz on SEMANA 21/05 A 28/05, created by Juanan Aroca Balsalobre on 29/05/2018.
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- Juanan Aroca Balsalobre
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