934602.fig.001a
(a)
934602.fig.001b
(b)
934602.fig.001c
(c)
934602.fig.001d
(d)
Figure 1: Temporal response acquired through a concrete wall: (a) description of the scene, (b) correspond to an acquisition at , (c) correspond to an acquisition at  + 500 ms, and (d) subtraction between (b) and (c) to clearly identify the “E4” echo corresponding to the moving target.