Moving Target Indicator (MTI) and Clutter Mitigation - MATLAB Simulations for Radar Systems Design - page 295

H () 2 H 1 () 2 H 1 () 2

=

(7.12)

+ Σ

+ Σ

x(t) y(t)

- -

delay, T delay, T

x(t) y(t)

Σ

Σ

-2

delay, T

-1

delay, T

delay, T

Figure 7.6. Two configurations for a double delay line canceler.

H 1 () 2

where is the single line canceler power gain given in Eq. (7.10). It

follows that

 4

ω T



--  

H () 2

= 16 sin

(7.13)

 

And in the z-domain, we have

) 2

– 1 – 1 – 2

H () 1 = ( – z = 12 z – + z

(7.14)

MATLAB Function Ðdouble_canceler.mÑ

The function Ðdouble_canceler.mÑ computes and plots (as a function of
) the amplitude response for a double delay line canceler. It is given in
Listing 7.2 in Section 7.11. The syntax is as follows:

f ⁄ f r

[resp] = double_canceler (fofr)

where fofr is the number of periods desired.

Fig. 7.7 shows typical output from this function. Note that the double can-
celer has a better response than the single canceler (deeper notch and flatter
pass-band response).