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SEMANA 21/05 A 28/05

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Aviónica 4to parcial Quiz on SEMANA 21/05 A 28/05, created by Juanan Aroca Balsalobre on 29/05/2018.
Juanan Aroca Balsalobre
Quiz by Juanan Aroca Balsalobre, updated more than 1 year ago
Juanan Aroca Balsalobre
Created by Juanan Aroca Balsalobre over 6 years ago
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Resource summary

Question 1

Question
Q1. A long pulse can have the same bandwidth (resolution) as a short pulse if the long pulse is modulated in:
Answer
  • a) Frequency or signal
  • b) Frequency or phase
  • c) Phase or signal
  • d) Signal or time

Question 2

Question
Q2. In order to improve the detection we use:
Answer
  • a) Integration of pulses: technique that combines the returns of several pulses instead of only 1
  • b) Adaptive threshold: the noise is estimated using noise-only samples and the threshold is replaced.
  • c) Frequency of the signal: The noise can be reduced by the spare time between signals.
  • d) Aand B are correct.

Question 3

Question
Q3. What information can give a primary surveillance radar?
Answer
  • a) Distance and azimuth of targets.
  • b) Meteorological information.
  • c) A and B are correct
  • d) The temperature of the engine.

Question 4

Question
Q4. What information be given by a secondary surveillance radar?
Answer
  • a) Distance, azimuth, altitude and velocity.
  • b) Identification of targets and emergency scenarios.
  • c) A and B are correct.
  • d) None of above

Question 5

Question
Q5. What are the most important advantages of radar Doppler?
Answer
  • a) High accuracy
  • b) Autonomous system
  • c) Use of real wind instead of estimated wind.
  • d) All of above

Question 6

Question
Q6. About ARTS (Automated Radar Terminal System).
Answer
  • a) Use to be inside aircrafts noise.
  • b) Is the combination of a secondary surveillance radar (SSR) and Aerodrome Surveillance Radar (ASR)
  • c) It is the cheapest kind of aircraft`s radar.
  • d) None of above

Question 7

Question
Q7. About Conical Scan in angle Tracking:
Answer
  • a) It is a result of the development of the sequential lobbing technique.
  • b) If the target is located off-bore sight, the receiver will receive an amplitude-modulated signal at the conscan frequency.
  • c) One of its disadvantages is that due to the potential foes a break lock of the radar can occur.
  • d) All of above are correct.

Question 8

Question
Q8. What is the most used technique about angle tracking?
Answer
  • a) Conical scan.
  • b) Sequential lobing.
  • c) Monopulse.
  • d) None of above.

Question 9

Question
Q1. Regarding pulse compression technique
Answer
  • A. A long pulse can have the same bandwidth (resolution) as short pulse if the long pulse is modulated in frequency or phase.
  • B. A long pulse can have the same bandwidth (resolution) as short pulse if the long pulse is modulated just in frequency.
  • C. A long pulse can have the same bandwidth (resolution) as short pulse if the long pulse is modulated just in phase.
  • D. A long pulse can not have the same bandwidth (resolution) as short pulse if the long pulse is modulated in frequency or phase.

Question 10

Question
Q2. Integration of pulses
Answer
  • A. This technique use the return from 1 pulse instead of several pulses.
  • B. This technique combines the returns from several pulses instead of only 1.
  • C. In this technique the noise is estimated using noise-only samples and the threshold is replaced.
  • D. Is not a technique to improve the detection.

Question 11

Question
Q3. Types of improving the target detection
Answer
  • A. Integration of pulses
  • B. Adaptive threshold
  • C. A and B are true
  • D. A and B are false

Question 12

Question
Q4. Primary surveillance radar
Answer
  • A. It gives distance and azimuth of targets.
  • B. It does not need on board equipment.
  • C. It can give meteorological information.
  • D. All are true.

Question 13

Question
Q5. Secondary surveillance radar
Answer
  • A. It gives distance, azimuth, altitude and velocity.
  • B. It gives identification of targets.
  • C. It uses interrogator (ground based) and transponder (airbone).
  • D. All are true.

Question 14

Question
Q6. Why doppler is important
Answer
  • A. Doppler lets you separate things that are moving from things that aren’t.
  • B. Doppler does not let you separate things that are moving from things that aren’t.
  • C. Doppler lets you know the temperature of the ground.
  • D. Doppler lets you know where is your house.

Question 15

Question
Q7. Range tracking technique
Answer
  • A. Range gating
  • B. Sequential lobing
  • C. Conical scan (Conscan)
  • D. Amplitude comparison monopulse

Question 16

Question
Q8. Angle tracking technique (chose the false)
Answer
  • A. Range gating
  • B. Sequential lobing
  • C. Conical scan (Conscan)
  • D. Amplitude comparison monopulse

Question 17

Question
Q1. Which of the following is not a new element in doppler radars:
Answer
  • A. The radar data processor
  • B. The modulor task included in the transmitter
  • C. Synchroniser function integrated into the exciter and the RDP
  • D. Analogic Signal Modulator

Question 18

Question
Q2. In relation with radar altimeter, choose the false one.
Answer
  • A. It determines the instantaneous altitude of the aircraft above the terrain over the aircraft is flying.
  • B. It makes use of the frequency modulated ranging.
  • C. The transmitted signal consists of a rectangular wave modulation.
  • D. The transmitted signal consists of a triangular wave modulation.

Question 19

Question
Q3. The terrain following radar:
Answer
  • A. Scans the terrain ahead of it and receives ground returns that are used for guidance.
  • B. Scans the terrain ahead of it and receives airborne returns that are used for guidance.
  • C. Scans the terrain under it and receives airborne returns that are used for guidance.
  • D. Scans the terrain under it and receives ground returns that are used for guidance.

Question 20

Question
Q4. The elements that compose a phased array:
Answer
  • A. Radiate in groups of 10
  • B. Radiate in groups of 5
  • C. Radiate in groups of 2
  • D. Radiate independently

Question 21

Question
Q5. Related to phased array antennas, planar arrays: (choose the wrong answer)
Answer
  • A. Does not use electronic switching means to scan the beam
  • B. Use electronic switching means to scan the beam
  • C. Use phasing techniques embedded within the design of the antenna to form and shape the beam
  • D. Have lower scanning capabilities being less expensive than the ESA.

Question 22

Question
Q6. Related to phased array antennas, ESA means:
Answer
  • A. Electronically Scanned Array
  • B. Electronically Surveillance Array
  • C. Electronically System Array
  • D. Electronically Shifter Array

Question 23

Question
Q7. Related to Synthetic Aperture Radar, the quality of the radar depends on:
Answer
  • A. Its power.
  • B. Its efficiency, related with the gain of the antenna.
  • C. Its ability to resolve very closely espaced objects.
  • D. None of them.

Question 24

Question
Q8. Which of the following are not a SAR MODE
Answer
  • A. Ground mapping
  • B. Spotlight Mode
  • C. Inverse SAR
  • D. Direct SAR

Question 25

Question
Q1. In hyperbolic Navigation System, there are three possible outcomes:
Answer
  • A. The lines cross at almost 90º. This represents the most accurate fix.
  • B. The lines cross at a much more acute angle. The result is a larger error ellipse.
  • C. There are two possible solutions. An ambiguity exists that can only be resolved by using a further station.
  • D. All above are corrects.

Question 26

Question
Q2. LORAN C means:
Answer
  • A. Long Range Navigation
  • B. Lost Range Navigation
  • C. Longitudinal Range Navigation System
  • D. Low Range Navigation

Question 27

Question
Q3. LORAN C is:
Answer
  • A. A pulsed system with at least 4 stations: 2 Master + 2 slaves
  • B. A pulsed system with at least 3 stations: 1 Master + slaves
  • C. A pulsed system with at least 3 stations: 2 Master + 1 slaves
  • D. A pulsed system with at least 2 stations: 1 Master + 1 slave

Question 28

Question
Q4. The GRI:
Answer
  • A. Means Group Repetition Interval and is unique for each LORAN chain
  • B. Means Ground Repetition Interval and is similar for each LORAN chain
  • C. Means Group Repetitive Interval Code and is unique for each LORAN chain
  • D. None of above.

Question 29

Question
Q5. GNSS:
Answer
  • A. Offers a cheap and accurate navigational means to anyone who possesses a suitable receiver.
  • B. Means global navigation satellite systems
  • C. A and B are corrects
  • D. None of above

Question 30

Question
Q6. GNSS has:
Answer
  • A. B and C are corrects
  • B. Three segments: control segment, space segment and user segment.
  • C. The space segment includes the satellite constellation, presently around 25 satellites that forms the basis of the network.
  • D. The control segment includes the satellite constellation, presently around 25 satellites that forms the basis of the network.

Question 31

Question
Q7. The baseline satellite constellation downlinks data in two bands:
Answer
  • A. L1 and L3 Navigation Signals
  • B. Only L1 Navigation Signals
  • C. L1 and L2 Navigation Signals
  • D. Only L3 Navigation Signals

Question 32

Question
Q8. GNSS has:
Answer
  • A. Offset between UTC time and atomic clock at satellite
  • B. Offset between satellite and receptor clocks (tu)
  • C. Other: measurement from starting time
  • D. All above and for this reason a fourth satellite is needed.
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