$
\begin{aligned}
s(x, t) &= \hat{s}\sin\left[ \omega\left(t + \frac{x}{c}\right) \right]
\\[1ex]
{\color{red} \vec{E}_1(x,t)} &= \begin{pmatrix}
0 \\
0 \\
s(x, t)
\end{pmatrix}
\\[1ex]
{\color{blue} \vec{E}_2(x,t)} &= \begin{pmatrix}
0 \\
s(x + u\cdot\lambda, t) \\
0
\end{pmatrix}
\\[1ex]
{\color{green} \vec{E}_{1+2}(x,t)} &= \begin{pmatrix}
0 \\
s(x + u\cdot\lambda, t) \\
s(x, t)
\end{pmatrix}
\end{aligned}
$
$u$
Azimuth
Elevation
Bank