DIAGRAM JAM-POWER -  JAM CAR -

Explaining the diagram: Each horizontal diagram segment represents a value of -2.5 dBW.  The HIPAR MDS (Minimum Detectable Signal) is -144 dBW and the MDS for the LOPAR - 129 dBW. Please look at the theory pages for a more detailed discussion of the formula parameter. At a distance of about 50 km between jammer and the receiving radar antenna the jamming signal strength is close to -67,5 dBW (LOPAR) and about -75 dBW for the (HIPAR). So, the jamming signal for the LOPAR is ~ 61,5 dBW and for the HIPAR ~ 69 dBW above the system noise level. (129-67.5 = 61.5 and 144-75 = 69) Jamming and radar receiver bandwidth are matched for these calculation. Also a 3dB loss of jam power was assumed. You have to add about 6dB of jam power if the HFB-320 was used as jamming source. (-61,5 dBW for the LOPAR and -69 dBW for the HIPAR, i.e. the received jam power is 67,5 dB (LOPAR) or 75 dB (HIPAR) obove system noise).

A COMPARISON:

Explaining the diagram: Each horizontal diagram segment represents a value of -5 dBW. Line 1 = 20 dB loss Line 2 = 10 dB loss and Line 3 = 0 dB loss of the radar. Line 2 follows the T1 MDS adjustment. That is also true for the diagram below. A very optimistic approach i guess. ;-) In both cases the jamming signal (Jp) is more than 1 000 000 (>60 dB) times stronger then the target signal at MDS.

Explaining the diagram: Please note that even targets with high Radar Cross Sections are not detectable in the presence of jamming as shown in the top table. The signals are  almost equal at a distance between 0 and 20 km but this area is/was the clutter region of the RADAR.