Term
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Definition
| The magnitude of the peak deviation from the average value of the disturbance. |
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Term
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Definition
| The distance between two identical points on adjacent waves. |
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Term
| State the relationship between the speed of a wave (c), its frequency and its wavelength. |
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Definition
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Term
What frequency band (i.e. – “low frequency”) is generally associated with a:
a. sky wave?
b. ground wave?
c. space wave? |
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Definition
a. sky wave? HF/MF
b. ground wave? LF
c. space wave? VHF |
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Term
| List the 5 Key Points about pulse characteristics and RADAR performance. |
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Definition
1. Varying the pulse width effects the range of the radar.
2. Need short pulses for short range targets.
3. PW determines radar’s minimum range resolution.
4. The lower the PRF the greater the radar’s maximum range.
5. The higher the PRF the greater the radar’s accuracy. |
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Term
| What are some advantages of a shorter PW? |
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Definition
Better range resolution and
Better detection of close targets (Better Min. Range) |
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Term
| What is one advantage of a Longer PW? |
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Definition
More power => Longer detection range
(Better Max. Range) |
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Term
| What is one advantage of a High PRF? |
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Definition
Increased probability of detection
More samples => Accurate |
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Term
| State at least three differences between the typical Pulse Radar and Continuous Wave Radar. |
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Definition
Pulse Echo
Single Antenna
Gives Range & Bearing
Susceptible To Jamming
Physical Range Determined By PW and PRF.
Continuous Wave
Requires 2 Antennae
No Range Info
High SNR
More Difficult to Jam But Easily Deceived
Amp can be tuned to look for expected frequencies |
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Term
| Why are wave guides used for Radar systems? |
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Definition
Most efficient means of conducting (E-M) energy from the transmitter to the antenna.A cable would act as a short circuit if used at that high of frequency.
Reality check: Radar systems can span several levels within a ship. A reliable transmission system must exist for the system to work. |
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Term
| List four advantages of a closed loop system. |
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Definition
Increased Accuracy,
Reduced Sensitivity to Disturbance,
Smoothing and Filtering,
Increased Bandwidth. |
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Term
| What are the basic functions of an angle tracking servo system? |
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Definition
Sense position error magnitude and direction,
Provide position feedback,
Provide data smoothing / stabilization,
Provide velocity feedback,
Provide a power-driving device. |
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Term
| What are the six functions of a track while scan system? |
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Definition
Target detection,
Target track correlation and association,
Target track initiation and track file generation (if a new target),
Generation of tracking “Gates”,
Track gate prediction- smoothing and positioning,
Display and future target calculations |
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Term
| What is an Acquisition Gate? |
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Definition
| describes a (large) volume of space initially assigned when a new contact is gained by a TWS system. |
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Term
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Definition
| for the same contact, describes a progressively smaller volume of space. |
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Term
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Definition
| TWS observes target maneuvering, before resolving back to Tracking Gate |
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Term
| Is AEGIS is a TWS system? |
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Definition
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Term
| What are the three methods of beam steering? State one advantage to each method. |
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Definition
Time delay scanning
Allows greater flexibility of freq. utilization.
Frequency scanning
Simple and inexpensive.
Phase scanning
Most commonly used (better system) at a moderate cost. |
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Term
| Electronic scanning and the phased array accomplish for us what the mechanical radar system would never be able to do. Yet, there are limitations/difficulties associated with this concept. Name some of them. |
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Definition
Element spacing.
The suppression of the side lobe interference.
Array element excitation amplitudes and geometry to achieve various beam radiation patterns.
Combining the phased array with track-while-scan function.
Modulating the radiated energy to transmit information (for missile guidance commands). |
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Term
| What is Electronic Support (ES)? |
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Definition
Search for, intercept, locate, record, and analyze the enemy’s use of the EM spectrum.
ALSO ELINT & COMINT |
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Term
| What is Electronic Attack (EA)? |
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Definition
| Prevent or reduce the enemy’s use of the electromagnetic spectrum while promoting uncertainty and also JAMMING. |
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Term
| What is Electronic Protection (EP)? |
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Definition
| Ensure the friendly use of the electromagnetic spectrum despite the enemy’s use of EW. |
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Term
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Definition
| The process of attempting to hide a target by saturating the radar display with random noise. |
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Term
| Name and describe three basic types of jamming. |
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Definition
Spot – Narrow Bandwidth, high power.
Barrage – Broad Bandwidth, at once, low power.
Sweep – FM, varying frequency, each “spike” sees, moderate power. |
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Term
The Standard Missile was designed as a:
A. Surface to air missile
B. Land attack missile
C. Air to surface missile
D. Torpedo mounted to a rocket booster |
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Definition
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Term
| What type of tracking is considered the most complex? |
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Definition
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Term
Sky waves are used primarily for:
Sky waves are used primarily for:
A. Long distance ranging
B. Long distance jamming
C. Long distance communication
D. Long distance tracking |
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Definition
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Term
Noise sets the absolute lower limit of the sensitivity of a radar.
A. True
B. False |
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Definition
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Term
Which is not an advantage of a closed loop feedback system?
A. Increased Accuracy
B. Smoothing and filtering
C. Increased bandwidth
D. Increased error |
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Definition
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Term
What helicopters do CG’s, DDG’s, and FFG’s embark for deployment?
A. SH-46 Sea Knight
B. UH-1N Iroquois
C. MH-53E Sea Dragon
D. SH-60B Sea Hawk |
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Definition
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Term
What is the primary mission of the DDG 51 Arleigh Burke class destroyer?
A. AW (AAW)
B. USW
C. EW
D. STW |
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Definition
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Term
Which is NOT one of the six basic requirements for all weapon systems?
A. Reliable
B. Safe
C. Flexible
D. Economical |
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Definition
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Term
A down doppler shift indicates that the frequency is ________ and the target is ________.
A. Increasing, closing
B. Increasing, opening
C. Decreasing, closing
D. Decreasing, opening |
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Definition
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Term
Which weapon is used in Air Warfare (AW)?
A. CIWS
B. Tomahawk
C. Harpoon
D. JDAM |
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Definition
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Term
Which of the following is NOT an example of a hybrid radar system developed to overcome the limitations of Pulse and CW?
A. Frequency Modulated CW
B. Moving Target Indicator
C. Pulse Doppler
D. Time Phasing Optimizer |
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Definition
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Term
The ability of a radar to change frequencies to overcome jamming is an example of:
A. ES
B. EP
C. EA
D. Burnthrough |
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Definition
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Term
Pulse Compression:
A. Allows for freq modulation to “tag” pulses
B. Allows for narrow pulses to decrease minimum range while maintaining power of long pulse
C. Allows for good range resolution while packing enough power for long range
D. |
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Definition
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Term
TWS systems combine:
A. Pulse radar with CW radar for better speed determination
B. A Phased Array with a Conical Scan System
C. Search radar with an electronic digital computer for multiple target tracking
D. Communications and Search Satelli |
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Definition
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Term
Which is NOT a benefit of electronic scanning?
A. Increased data rate
B. Elimination of target designation process from search radar to fire control radar
C. Virtually instantaneous radar beam positioning
D.Increased flexibility |
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Definition
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