Appendix I: Symbols, Their Meaning and SI Units

These are the basic symbols used. Some have several subscripts, e.g. L, L _s, L _sys, etc.

A	signal scaling factor	[ ]
A	antenna area	[m ²]
A _c	clutter area	[m ²]
2 a	bistatic baseline	[m]
B	bandwidth	[Hz or rad s ^-1]
C	array element correction coefficient	[ ]
C _n ²	structure constant	[m ^2/3]
C _r ²	layer scattering factor	[ ]
C _s ²	volume scattering factor	[ ]
c	speed of light	[ms ^-1]
c(t)	clutter voltage	[V]
D	antenna directivity	[ ]
D	diameter of a water droplet	[m]
D	ambipolar diffusion coefficient	[m ² ^-1]
D	length of an antenna array	[m]
d	linear antenna dimension	[m]
d	array element spacing	[m]
d	distance between synthetic aperture radar and scatterer	[m]
E	energy	[J]
E[ ]	expectation value	[units]
E	field from N elements of an array	[V m ^-1]
e	partial pressure of water vapour	[millibars]
e	bistatic ellipticity factor	[ ]
F	receiver noise figure	[ ]
F _a	effective antenna noise factor	[ ]
f	frequency	[Hz]
f	over-the-horizon propagation factor	[a]
f _d	doppler frequency shift	[Hz or rad s ^-1]
? f _d	doppler resolution	[Hz or rad s ^-1]
? f _d	doppler uncertainty	[Hz or rad s ^-1]
? f	frequency separations or swept frequency	[Hz or rad s ^-1]
G	antenna gain	[ ]
g	acceleration due...

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Understanding Radar Systems