Lockheed Martin AN/APY-9
From Scramble - The Aviation Magazine
The AN/APY-9 is an ASEA radar developed for the E-2D Hawkeye. The surveillance envelope of the UHF radar is about 250 percent larger than the E-2C's and can ‘see’ smaller targets and more of them at a greater range. Its range is quoted as 'more than 300 nm maximum range', probably for large aircraft targets. The new radar will fit into approximately the same space as the housing for the AN/APS-145, the current Hawkeye's radar system. The AHE radar will be more sophisticated and complex than the AN/APS-145. The US Navy expects to had fully replaced the AN/APS-145 radar on the 75 E-2D Hawkeyes planned to be in service by 2020.
The AN/APY-9 is an electronically/mechanically scanned AEW & C radar that is described as being 'two generations' ahead of the AN/APS-145 radar installed aboard E-2C/E-2C Hawkeye 2000 platforms and as weighing approximately 998 kg. Other system features include:digital beam forming and excitation Space-Time Adaptive Processing (STAP)use of monopulse techniques (to improve accuracy)in-beam stagger (to eliminate blind speeds)simultaneous air and sea surface target detectionuse of an open, commercial-off-the-shelf architecture (with modular hardware design)use of a solid-state, silicon carbide-based transmission chainported functionality (maintaining domain knowledge)use of an 'advanced' detection data processor (based around CSP Inc FastCluster 2942 blades and offering increased time on threat, flexible beam management and 'enhanced' target tracking)use of an L-3 Communications Randtron Antenna Systems-sourced Rotodome Antenna Group (RAG) use of an Applied Aerospace Structures Corporation (AASC)-sourced composite rotodome use of Northrop Grumman-sourced solid-state power amplifiersuse of a Raytheon-sourced, low-noise, digital receiveruse of a BAE Systems-sourced, co-aligned, active scanning array, Identification Friend-or-Foe (IFF) interrogator.Looking at some of these in more detail, the AN/APY-9's RAG incorporates an 18-channel Advanced Detection System-18 (ADS-18) antenna and a 36-element IFF array, with the whole being housed in the cited AASC rotodome. Here, the ADS-18 antenna is scanned electronically in elevation and both electronically (offering instantaneous 120° sector coverage) and mechanically in azimuth and makes use of an 18-channel rotary coupler as the interface between itself and the radar's inboard electronics.