BOOK_CONTENT
From Introduction to Electronic Defense Systems, Second Edition

Glossary

Symbols

?
absorptance
?
difference channel of a monopulse radar
? f
frequency interval or difference
?
emissivity; also a general measure of precision
? B
width at half-power (-3 dB) beam (i.e., angle within which the power of the transmitted signal is more than half its maximum level)
? q
squint angle
?
wavelength: distance between two adjacent peaks on a sinusoidal wave; for an electromagnetic wave the wavelength is given by c/f where c is the velocity of light and f is the frequency of the wave
?
reflectance or reflection coefficient
? r
reflection coefficient of a rough surface
? s
specular reflection coefficient
?
sum channel of a monopulse radar
?
Stefan-Boltzmann constant
?
equivalent area
?
standard deviation (i.e., square root of the variance of a probability distribution; a quantity whose values have a Gaussian distribution has a 67% probability of being within ? of the mean; 90% probability of being within 2 ?; 97% probability of being within 3 ?)
? p
standard deviation of a quantity with zero mean
?
pulse duration, pulsewidth (PW)
? a
atmospheric transmittance
? 0
transmittance of optical system
?
phase or phase shift angle
?
field of view, measured as a solid angle
?
angular velocity or angular frequency of a signal

A-C

AAA
anti-aircraft artillery
AAM
air-to-air missile
ac
alternating current
A/D, ADC
analog-to-digital converter
a e
radius of the Earth (8.5 10 6ms)
A eff
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