The biggest advantage of AESA operating between 2 to 4 Ghz frequency is that, any T/R module pointed out in a certain directoin can have a different response coming after reflected back by that distance object. After going over different image processing techniques one can get a clearer picture of that object is. Different T/R module interact in the back end of the processing engine of radar and come up with output after complex fourier transforms and image processing techinques to give u a clear identification of distant threat.
You can make out, whether the object is a SU30Mki or a Mig29 based on minute details you will get from different T/R frequencies... Threat can be analyzed and neccesary dispatches made based on them... you gotta love the AESA radar to get minute details on your enemies...
you wont see on your radar that the threat is a distant unidentified aircraft but u will know threat is SU30MKi. You can distinguish far far away whether the threat is from T90 tanks or T72 tanks. if you were using doppler radar, you will know about the threat, but wont know what kinda of thank threat that may be. Also you wont know the quantity or amount of threat or if there its a tank regiment only or if there is any infanry regiment embedded with it.
AESA is a game changer, far away u can dig down to the regimental (infantry or tank) nature of your ground forces and its size and its firepower. With doppler radar, you might have thought of that regiment to be an enemy division, cant fool multiple freqeuncies...
Hope this helps....