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The AN/SPY-3 is the first U.S. shipboard AESA, which will first go into Zumwalt-class destroyers but may be retrofitted; it adds significant capability for littoral operations, making amphibious warfare ships an obvious candidate.

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ORIGINAL: emsoy

It is not. Each array transmit 1+ MW [:D]

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ORIGINAL: A1-H60BB-NFM-000


Due to the adverse effects of EMI on aircraft operating in the vicinity of
SPY--1 radar, SH--60B aircraft should not close within 2 nm of CG--47 or
DDG--51 class ships unless SPY--1 is operating at lowpower, the controller
has broken data link, and the helicopter track has been dropped. Prior to
takeoff on these class of ships, aircraft commanders should ensure that
Hawk Link is in standby (following removal of the hardwire) and not
placed to radiate until the aircraft is 2 nm clear of own ship.

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Edit: ExNusquam, the copy of that document I found was from 2008 and rated as Distribution Statement "C" for defense contractors and govt. agencies only. Was this cleared for public release in a later revision? Or is there an older version that's public?

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advanced ESM/RWR sensors can detect LPI radars, directional information about the emission and pass that on to other platforms that can also search for similar emissions they might have detected.

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One of the so called Low Probability of Intercept (LPI) modes of operation possible with AESA radar works like this. Instead of forming one beam at full power and searching for targets that way, the radar forms hundreds of very weak but very precise beams. The aggregate power output is the same, but at any one point in time on any one bearing the signal is basically at the same level as the background hiss. The frequency is also randomized but logged by the LPI radar. To a RWR there is nothing but the same background hiss as the rest of the sky. But the LPI radar knows to look for a specific hiss level spike on a specific frequency for a specific bearing at a specific time. It integrates these over time. If nearly every single time slice shows hiss level spike at the identified frequency for that bearing and time slice, there is a return. If it shows random spikes and valleys there's nothing there.

In order to do this the radar must have the ability to generate hundreds of different beams at varying frequencies all at once. This requires an AESA. Only the transmitting AESA radar has the when, at what frequency and down what bearing to look for the a particular hiss behavior. The RWR which does not have the specific log of when at what frequency the very weak signals should be arriving over time only sees background static.