Electronic Countermeasures (ECM) - MATLAB Simulations for Radar Systems Design - page 475

Figure 10.3. Burn-through range versus ERP. (S/(J+N) = 15 dB.

10.2.2. Stand-Off Jammers (SOJ)

Stand-off jammers (SOJ) emit ECM signals from long ranges which are
beyond the defenseÓs lethal capability. The power received by the radar from
an SOJ jammer at range

R J is

λ 2 G ′
4π

λ 2 G ′
4π

P J G J
4π R 2

1
B J L J

ERP
4π R 2

1
B J

------------- ------------ ----------- ------------- ------------ -----

J = =

(10.12)

where all terms in Eq. (10.12) are the same as those for the SSJ case except for
. The gain term represents the radar antenna gain in the direction of the
jammer and is normally considered to be the sidelobe gain.

G ′ G ′

The SOJ radar equation is then computed as

P t τ G 2 R J

2 σ B J

S
---

= ----------------------------------------

(10.13)

) G ′ R 4 L

4π ERP (

and when pulse compression is used, with time-bandwidth-product G PC then

Eq. (10.13) can be written as