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The '''Back Scattering Alignment''' (BSA) is a coordinate system used in coherent electromagnetic scattering. The coordinate system is defined from the viewpoint of the wave source, before and after scattering. The BSA is most commonly used in [[radar]], specifically when working with a [[Sinclair Matrix]] because the radar detector and source are physically coaligned. BSA gives rise to  [[Eigenvalue, eigenvector, and eigenspace|conjugate eigenvalue equations]]. The alternative coordinate system in electromagnetic scattering is the [[Forward Scattering Alignment]] (FSA) which is primarily used in [[optics]]. Both coordinate systems contain essentially the same information and meaning, and thus a scattering matrix can be transformed from one to the other by use of the matrix,

<math> S_{FSA} = \begin{bmatrix} 1 & 0 \\ 0 & -1 \end{bmatrix} S_{BSA}</math>

==See also==

*[[Electromagnetic radiation]]

==References==
{{reflist}}

==External links==

[[Category:Electromagnetic radiation]]


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