India has finally signed a deal with Brazil to base its indigenously developed airborne early warning and control (AEW&C) aircraft on Embraer's EMB-145 regional jet. The countries have signed an agreement for three "modified green" aircraft, the first to be delivered in three years, with flight testing to begin in 2012. You can see what India's the EMB-145-based AEW&C should look like here, but it will look pretty similar to this, Embaer's P-99A AEW&C...
Embraer's AEW&C carries the Saab (formerly Ericsson) Erieye phased-array radar. The Indian air force version will carry an active-array antenna under development by the Bangalore-base Defence Research & Development Organisation's Centre for Airborne Systems. DRDO will integrate the mission system, including radar and datalinks, into modified aircraft supplied by Embraer.
The Indian air force has already ordered three AEW Ilyushin Il-76s (actually Beriev A-50EIs) modified by Israel with Elta's Phalcon phased-array. The first arrived for modification in January and began flight testing in Israel in June.