Radar Waveforms - MATLAB Simulations for Radar Systems Design - page 158

160 MATLAB Simulations for Radar Systems Design

For example, assume that the range profile starts at and that R 0 = 900 m

nscat tau n deltaf prf v

3 64 0.0

100µsec 10 MHz 10 KHz

In this case,

3 0 8 ×

2 4

∆ R = ------------------------------------------ = 0.235 m

10 6 × × 10 ×

3 0 8 ×

2 0 0 6

R u = ------------------------------ = m

× ×

Thus, scatterers that are more than 0.235 meters apart will appear as distinct
peaks in the synthesized range profile. Assume two cases; in the first case,

[scat_range] = [908, 910, 912] meters, and in the second case , [scat_range] =
[908, 910, 910.2] meters. In both cases, let [scat_rcs] = [100, 10, 1] meters
squared.

Fig. 3.10 shows the synthesized range profiles generated using the function
Ðhrr_profile.mÑ and the first case when the Hamming window is not used. Fig.
3.11 is similar to Fig. 3.10, except in this case the Hamming window is used.
Fig. 3.12 shows the synthesized range profile that corresponds to the second
case (Hamming window is used). Note that all three scatterers were resolved in
Figs. 3.10 and 3.11; however, the last two scatterers are not resolved in Fig.
3.12, since they are separated by less than . ∆ R

Figure 3.10. Synthetic range profile for three resolved scatterers. No window.