10/4/2010, GOKULA KRISHNANS: Active Electronically Scanned Array - (AESA) Radar Citat: "...AESAs aim their "beam" by broadcasting a number of different frequencies of coherent radio energy that interfere constructively at certain angles in front of the antenna. They improve on the older passive electronically scanned radars by spreading their broadcasts out across a band of frequencies, which makes it very difficult to detect over background noise...Unlike the PESA, where the signal was generated at single frequencies by a small number of transmitters, in the AESA each module broadcasts its own independent signal. This allows the AESA to produce numerous "sub-beams" and actively "paint" a much larger number of targets...A phased array antenna is composed of lots of radiating elements each with a phase shifter. Beams are formed by shifting the phase of the signal emitted from each radiating element, to provide constructive/destructive interference so as to steer the beams in the desired direction. The signal is amplified by constructive interference in the main direction. The beam sharpness is improved by the destructive interference...As can be expected, the technology comes at a cost. Each TR module is independent radar. Initial cost of a TR module was reportedly around $2000. Fighter radars are usually in the 1000 to 2000 modules size range...", backup
May 27, 2011, aviationintel.com: The great RADAR race: AESA development in high gear Citat: "...On the other hand, AESA radars can be very hard to detect by the enemy via multiple methods such as frequency hoping, modulating a continuous wave signal and using the very least amount of power to detect, track and engage a target...Finally, AESA radars and their incredibly capable software and computer backends can act as information transmitters as well. This sounds strange but it is true, because the radars can modulate and transmit radiation so quickly they can also eventually transmit large amounts of information such a high-resolution streaming video to receivers...", backup
bliley.com
blog.bliley.com
Sep 12, 2017, blog.bliley.com: Understanding AESA: A Game-Changer in RADAR Technology Citat: "...Active Electronically Scanned Arrays are considered a phased array system, which consists of an array of antennas which form a beam of radio waves that can be aimed in different directions without physically moving the antennae themselves. The primary use of AESA technology is in radar systems....", backup
Sep 12, 2017, blog.bliley.com: Understanding AESA: A Game-Changer in RADAR Technology Citat: "...Active Electronically Scanned Arrays are considered a phased array system, which consists of an array of antennas which form a beam of radio waves that can be aimed in different directions without physically moving the antennae themselves. The primary use of AESA technology is in radar systems....", backup
10/4/2010, GOKULA KRISHNANS: Active Electronically Scanned Array - (AESA) Radar Citat: "...AESAs aim their "beam" by broadcasting a number of different frequencies of coherent radio energy that interfere constructively at certain angles in front of the antenna. They improve on the older passive electronically scanned radars by spreading their broadcasts out across a band of frequencies, which makes it very difficult to detect over background noise...Unlike the PESA, where the signal was generated at single frequencies by a small number of transmitters, in the AESA each module broadcasts its own independent signal. This allows the AESA to produce numerous "sub-beams" and actively "paint" a much larger number of targets...A phased array antenna is composed of lots of radiating elements each with a phase shifter. Beams are formed by shifting the phase of the signal emitted from each radiating element, to provide constructive/destructive interference so as to steer the beams in the desired direction. The signal is amplified by constructive interference in the main direction. The beam sharpness is improved by the destructive interference...As can be expected, the technology comes at a cost. Each TR module is independent radar. Initial cost of a TR module was reportedly around $2000. Fighter radars are usually in the 1000 to 2000 modules size range...", backup
May 27, 2011, aviationintel.com: The great RADAR race: AESA development in high gear Citat: "...On the other hand, AESA radars can be very hard to detect by the enemy via multiple methods such as frequency hoping, modulating a continuous wave signal and using the very least amount of power to detect, track and engage a target...Finally, AESA radars and their incredibly capable software and computer backends can act as information transmitters as well. This sounds strange but it is true, because the radars can modulate and transmit radiation so quickly they can also eventually transmit large amounts of information such a high-resolution streaming video to receivers...", backup
