Q1. A long pulse can have the same bandwidth (resolution) as a short pulse if the long pulse is modulated in:
a) Frequency or signal
b) Frequency or phase
c) Phase or signal
d) Signal or time
Q2. In order to improve the detection we use:
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.
Q3. What information can give a primary surveillance radar?
a) Distance and azimuth of targets.
b) Meteorological information.
c) A and B are correct
d) The temperature of the engine.
Q4. What information be given by a secondary surveillance radar?
a) Distance, azimuth, altitude and velocity.
b) Identification of targets and emergency scenarios.
c) A and B are correct.
d) None of above
Q5. What are the most important advantages of radar Doppler?
a) High accuracy
b) Autonomous system
c) Use of real wind instead of estimated wind.
d) All of above
Q6. About ARTS (Automated Radar Terminal System).
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.
Q7. About Conical Scan in angle Tracking:
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.
Q8. What is the most used technique about angle tracking?
a) Conical scan.
b) Sequential lobing.
c) Monopulse.
d) None of above.
Q1. Regarding pulse compression technique
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.
Q2. Integration of pulses
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.
Q3. Types of improving the target detection
A. Integration of pulses
B. Adaptive threshold
C. A and B are true
D. A and B are false
Q4. Primary surveillance radar
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.
Q5. Secondary surveillance radar
A. It gives distance, azimuth, altitude and velocity.
B. It gives identification of targets.
C. It uses interrogator (ground based) and transponder (airbone).
Q6. Why doppler is important
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.
Q7. Range tracking technique
A. Range gating
B. Sequential lobing
C. Conical scan (Conscan)
D. Amplitude comparison monopulse
Q8. Angle tracking technique (chose the false)
Q1. Which of the following is not a new element in doppler radars:
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
Q2. In relation with radar altimeter, choose the false one.
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.
Q3. The terrain following radar:
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.
Q4. The elements that compose a phased array:
A. Radiate in groups of 10
B. Radiate in groups of 5
C. Radiate in groups of 2
D. Radiate independently
Q5. Related to phased array antennas, planar arrays: (choose the wrong 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.
Q6. Related to phased array antennas, ESA means:
A. Electronically Scanned Array
B. Electronically Surveillance Array
C. Electronically System Array
D. Electronically Shifter Array
Q7. Related to Synthetic Aperture Radar, the quality of the radar depends on:
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.
Q8. Which of the following are not a SAR MODE
A. Ground mapping
B. Spotlight Mode
C. Inverse SAR
D. Direct SAR
Q1. In hyperbolic Navigation System, there are three possible outcomes:
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.
Q2. LORAN C means:
A. Long Range Navigation
B. Lost Range Navigation
C. Longitudinal Range Navigation System
D. Low Range Navigation
Q3. LORAN C is:
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
Q4. The GRI:
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.
Q5. GNSS:
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
Q6. GNSS has:
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.
Q7. The baseline satellite constellation downlinks data in two bands:
A. L1 and L3 Navigation Signals
B. Only L1 Navigation Signals
C. L1 and L2 Navigation Signals
D. Only L3 Navigation Signals
Q8. GNSS has:
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.
