30,000 km?
This is not an AWACS/AEW plane. The purpose of an AEW is for the most part to generate a situation picture of the airspace out to a long range, and assisting the Air Force in securing and managing that airspace with their L/S-band long-wavelength radars. The DRDO-made Netra AEW radar can scan targets at over 475 km in extended range mode. Logical to assume the Phalcon can see farther.
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^^ That is what a typical AEW situation picture looks like, not that different from an Air Traffic Control (ATC) screen, with data such as position vectors, aircraft identification, speed of targets etc. being constantly monitored -
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The purpose of an ISTAR aircraft such as the Sentinel, on the other hand, is mostly collecting ISR (Intelligence, Surveillance, Reconnaissance) of ground targets, movement of troops or locations & elevation models of stationary buildings or natural formations like mountains etc. ISTAR planes (including the Sentinel and ARC's Global 5000s) are generally equipped with Synthetic Aperture Radars (SAR), and the data they collect is of a different nature -
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This is not to say AEWs cannot look at ground targets or that ISTAR planes cannot scan the sky, but to say that its not their intended role.