I bet our AWACS and other stand off radar platforms cast a huge shadow. On these passive cat whiskers.
The AWACS (& other airborne) radar platforms throw
another interesting complication into the mix.
They are moving too.
To compute the location, (in relationship to the receiver,)
of a moving object reflecting a stationary transmitters signal
would be easy compared to computing the location,
(in relationship to the receiver,) of a moving object
reflecting a signal from another moving object.
The location of the transmitter (AWACS, etc) could be
determined by a active radar, but lighting up a USAF AWACS platform
is akin to standing in the middle of Paris Island yelling "Jarheads are fags."
The problem with using AWACS/J-STARS in this system is that the wedge of space the "shadow" would have to pass through to be detected is constantly moving. In order to utilize this, first the location of the airborne radar would have to be determined (either through the enemies' active radar or through TMA), then the shadow would have to have the same analasys at the same time. In short, while AWACS could be used to say that a target's at a certain bearing, it's not going to be enough for even tracking.
Each move causes a counter-move. Given the state of computer processing, it won't be long before this is also defeated.