Page 341 - NS-2 Textbook

336 NAUTICAL SCIENCES

ElECTRONIC WARFARE 4. What four variations from the straight wave path are
caused by atmospheric or weather elements?
Electronic warfare (EW) uses highly sophisticated elec-
5. Define the following wave terms:
tronics to counter the enemy's radiated electromagnetic
A. Cycle
waves and to ensure the proper and effective use of our
B. Wavelength
own. The electronic warfare systems include (1) collec-
C. Amplitude
tion of information regarding the enemy without its
D. Period
being aware, and without divulging our presence; (2)
6. What range of frequencies in the electromagnetic
hindering or rendering the enemy's electronic spectrum
spectrwn comprise radio waves?
useless by jamming circuits with electronic comltermea-
7. What is the fundamental principle of radar?
sures (ECM), now referred to as electronic attack (EA)
8. What are the three general categories of U.S. Navy
measures; and (3) electronic counter-countermeasures
radars?
(ECCM), now called electronic protection (EP), which en-
9. What are the two categories of search radars, and
sure the proper use of our electronic spectrmn-in spite
what are they used for?
of the enemy's attempts to direct EA at our unit. •
10. What is the "scope" or PPI presentation for a search
radar?
11. What are the functions of EA and EP?
CRITICAL THINKING
1. Why is a basic understanding of electronics important Vocabulary
for ainlost everyone in today's society?
electromagnetic wave fire control radar
radar Combat Information Center
----,,--
amplitude (CIC)
Study Guide Questions wavelength (radio wave) Combat Direction Center
cycle (CDC)
1. A. What are the two types of waves?
frequency electronic warfare
B. What are the two forms these waves can take?
hertz electronic attack
2. A. What is the standard unit of measurement of
refraction (radio wave) electronic protection
frequency?
diffraction jamming
B. What does this measurement represent?
trapping electronic countermeasure
3. What is the audible frequency range?