Position switched

In this case, only half of the time is spent in the direction of the source. Thus

  $\displaystyle \ensuremath{t_\ensuremath{\mathrm{on}}}= \ensuremath{t_\ensuremath{\mathrm{off}}}= \frac{\ensuremath{t_\ensuremath{\mathrm{onoff}}}}{2},
$ (9)
  $\displaystyle \ensuremath{t_\ensuremath{\mathrm{sig}}}= \frac{\ensuremath{t_\en...
...ath{\mathrm{off}}}}{2} = \frac{\ensuremath{t_\ensuremath{\mathrm{onoff}}}}{4},
$ (10)
and
  $\displaystyle \ensuremath{\sigma_\ensuremath{\mathrm{psw}}} = \frac{2\,\ensurem...
...h{\eta_\ensuremath{\mathrm{tel}}}\,\ensuremath{t_\ensuremath{\mathrm{tel}}}}}.
$ (11)