Term
| What does RADAR stand for |
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Definition
| RADAR stand for Radio Detection and Range |
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Term
| Discuss the Doppler Effect |
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Definition
| Apparent change in frequency or pitch when a sound source moves either toward or away from the listener |
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Term
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Definition
| the reflection of the original sound wave as it bounces off a distant surface |
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Term
Defin the following
Sea Return |
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Definition
| target echoes created from radar strikes when energy is reflected off the waves at various angles away from the ship, Rogher seas = more sea return |
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Term
Defin the following
Clutter |
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Definition
| term used for unwanted echoes in radar systems |
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Term
Defin the following
Ground Clutter |
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Definition
| returns from georgaphical land masses are generally stationary |
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Term
Defin the following
Sea Clutter |
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Definition
| distrubing radar echoes of sea wave crests. Sea clutter is very difficult to control without some loss in detection |
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Term
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Definition
| The length of a straight line between a radar set and a target |
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Term
Defin the following
Amplitude |
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Definition
| Displacment from undistubed position of medium to top of a crest (strenght of signal) |
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Term
Define the following
Wavelenghth
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Definition
| (one 360 degree cycle) distance from crest of one wave to crest of next wave, |
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Term
Define the following
Cycle |
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Definition
| One full wavelength of a wave represents one complete cycle |
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Term
Define the following
Ground Wave |
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Definition
radio waves that travel near surface of earth (2 Typer)
Surface wave: Reaches the receiving site by traveling along surface of the ground
Space Wave: follows two distinct paths from transmitting antenna to receiving antenna, one through air directly to receiving antenna, the other reflected from groung to reciving antenna |
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Term
Define the following
Sky Wave |
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Definition
| Radio waves that are reflected back to earth from ionosphere |
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Term
Define the following
Reflection |
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Definition
| waves that are neither transmitted nor absorbed, but are reflected |
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Term
| 3 basic characteristics of sound |
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Definition
A. Pitch: frequency of wave
B. Intensity: Amplitude of the waves
C. clarity of the wave |
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Term
characteristics of an antenna
Reciprocity |
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Definition
| interchangeability of the same antenna for transmitting and receiving |
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Term
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Definition
| Malicious program that modifies other host files or boot areas to replicate, enabling it to spread from one computer to another |
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Term
Dangers associated with the following
Hoax Viruses |
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Definition
| A chain mail claiming gloom and doom |
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