Download LADAR Proximity Fuze - System Study -

4.2. VISUALIZATION PANEL
4.2.1
35
Pixel Simulation
The pixel simulation does not generate images but signals plots. It corresponds
to one single laser shot done to detect the distance of one surface element (pixel)
located at target range. Once the pixel simulation has been run, an array of 4
graphs are displayed in the visualization panel. The first row always provides the
same information, that is to say a graph with the plot of the laser pulse sent and
a graph with three other plots related to the received signal (received pulse, noisy
received pulse and sampled noisy received pulse), an example is given in Figure 4.3.
Figure 4.3. Pixel simulation: 1st row.
The 2nd row shows two graphs which depend on the detection algorithm selected:
CFD algorithms or matched filter algorithm.
CFD Algorithms
To the CFD algorithms (CFD and CFD 50%) correspond the plots of the two
significant curves of the method: the input pulse and the S-shaped profile with its
zero crossing (see the algorithms descriptions in sections 3.5.1 and 3.5.2). Thus, the
first plot contains these two curves for the sent pulse and the second plot as well
but with respect to the sampled noisy received pulse, see Figure 4.4. Moreover, the
red + on the pulse corresponds to the triggering time (⇔ the zero crossing of
the S-shaped profile) used for the range computation. On the other hand, the
magenta × is the limit after which the detection is enable (⇔ the ceil range
option described in Section 3.3).
Figure 4.4. Pixel simulation: 2nd row with CFD.