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An Electronically Scanned Array (AESA), also known as active phased array radar is a type of radar whose transmitter and receiver functions are composed of numerous small transmit/receive (T/R) modules. AESA radars feature short to instantaneous (millisecond) scanning rates and have a desirable low probability of intercept. As solid state devices, AESA radars have vastly simpler mechanical designs. They require no complex hydraulics for antenna movement nor hinge appendages. The AESA radar occupies less space than typical radar, because of its reduced infrastructure requirements and of course its absent range of motion. With these improvements the radar is much more reliable, and requires much less maintenance. Main advantages over mechanically scanned arrays are extremely fast scanning rate, much higher range, tremendous number of targets being tracked and engaged (multiple agile beams), low probability of intercept, ability to function as a radio/jammer, simultaneous air and ground modes, Synthetic Aperture Radar. AESA radars for increased radar field of view; The movement performance of the antenna would not need to be nearly as great as that of a traditional radar, as the radar sweep is not integral to the contact update rate.
[edit] FeaturesAESA radars have:
[edit] The Difference Between AESA and PESAIn a passive electronically scanned array (PESA), the microwave feed network in the back of the antenna is powered by a single radio frequency (RF) source (magnetron, klystron, TWT, etc.), sending its waves into phase shift modules (usually digitally-controlled), which, in turn, feed the numerous emitting elements. An AESA, instead, has an individual RF source for each of its many transmit/receive elements, making them "active". This provides a level of redundancy for the system, as the failure of individual or groups of T/R modules would not necessarily keep the radar from functioning. AESA radars replace the traditional radar RF sources (magnetron/klystron/TWT), which usually require extremely high operating voltage and power, with multiple solid state RF sources operating at low voltage (40 to 60 volts). Solid state electronics use silicon or gallium arsenide based power amplifier technology and benefit to some extent from mass production techniques developed for consumer electronics. US based manufacturers of the AESA radars used in the F22 and Super Hornet include Northrop Grumman[1] and Raytheon.[2] These companies also design, develop and manufacture the transmit/receive modules which comprise the 'building blocks' of an AESA radar. The requisite electronics technology was developed in-house via Department of Defense research programs such as MIMIC Program.[3][4] [edit] List of AESA radars[edit] Airborne systems
[edit] Ground and sea-based systems
[edit] See also[edit] References[edit] External links
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