Radar Waveforms - MATLAB Simulations for Radar Systems Design - page 160

162 MATLAB Simulations for Radar Systems Design

Next, consider another case where [scat_range] = [908, 912, 916] meters.
Fig. 3.13 shows the corresponding range profile. In this case, foldover occurs,
and the last scatterer appears at the lower portion of the synthesized range pro-
file. Also, consider the case where

[scat_range] = [908, 910, 923] meters
Fig. 3.14 shows the corresponding range profile. In this case, ambiguity is
associated with the first and third scatterers since they are separated by . 15 m

Both appear at the same range bin.

3.6.2. Effect of Target Velocity

The range profile defined in Eq. (3.64) is obtained by assuming that the tar-
get under examination is stationary. The effect of target velocity on the synthe-
sized range profile can be determined by substituting Eqs. (3.55) and (3.56)
into Eq. (3.58), which yields

n –

∑

1

τ 1
2

 

j 2π li
n

2 R
c

2 v
c

2 R
c

 

------ iT

H l = A i exp ---------- – j 2π f i ------- – ++ ----- -------

 

(3.74)

 

 

i = 0

Figure 3.13. Synthetic range profile for three scatterers. Third scatterer folds
over.