Radar cross section (RCS) describes the extent to which an object reflects an incident electromagnetic wave. It is a measure of the strength of the radar signal backscattered from a target object for
a given incident wave power..
The component of a three-dimensional velocity vector oriented along the radial direction from the origin point or axis in polar, cylindrical, or spherical coordinates. In connection with Doppler rada
r, the radial velocity component is called Doppler velocity.
The component of a three-dimensional velocity vector of an object directed along the line of sight. It is measured by examining the Doppler shift of lines in the spectrum of astronomical objects.
The component of a three-dimensional velocity vector of an object directed along the line of sight. It is measured by examining the Doppler shift of lines in the spectrum of astronomical objects.
A radiometric term for the rate at which radiant energy in a set of directions confined to a unit solid angle around a particular direction is transferred across unit area of a surface (real or imagin
ary) projected onto this direction.
A radiometric measurement that describes theamount of electromagnetic radiation that passes through or is emitted from aparticular area, and falls within a given solid angle in a specifieddirection. T
hey are used to characterize both emission from diffuse sourcesand reflection from diffuse surfaces.
A radiometric measurement that describes the amount of
electromagnetic radiation that passes through or is
emitted from a particular area, and falls within a given
solid angle in a specified direction
. They are used to
characterize both emission from diffuse sources and
reflection from diffuse surfaces. The SI unit of radiance
is watts per steradian per square meter (W*s*r^-1*m^-2).