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- The AN/APQ-181 is an all-weather, low probability of intercept (LPI) phased array radar system designed by Hughes Aircraft (now Raytheon) for the U.S. Air Force B-2A Spirit bomber aircraft. The system was developed in the mid-1980s and entered service in 1993. The APQ-181 provides a number of precision _targeting modes, and also supports terrain-following radar and terrain avoidance. The radar operates in the Ku band (a subset of the J band). The original design uses a TWT-based transmitter with a 2-dimensional passive electronically scanned array (PESA) antenna. In 1991, the B-2 Industrial Team (including Hughes as a major subcontractor) was awarded the Collier Trophy in recognition of the "design, development, production, and flight testing of the B-2 aircraft, which has contributed significantly to America's enduring leadership in aerospace and the country's future national security." In 2002, Raytheon was awarded a contract to develop a new, active electronically scanned array (AESA) version of the APQ-181. This upgrade will improve system reliability, and will also eliminate potential conflicts in frequency usage between the B-2 and commercial satellite systems that also use the J band. In 2008 the Federal Communications Commission accidentally sold the APQ-181 frequency to a commercial user resulting in the need for installing new radar arrays at a cost of over $1 billion. All B-2 aircraft are expected to have the upgraded radar by 2010. (en)
- AN/APQ-181 adalah sebuah sistem radar segala cuaca, probabilitas rendah intercept (LPI) yang dirancang oleh Hughes Aircraft (sekarang Raytheon) untuk pesawat bomber Angkatan Udara AS B-2A Spirit. Sistem ini dikembangkan di pertengahan 1980-an dan mulai beroperasi pada tahun 1993. APQ-181 menyediakan sejumlah mode presisi penargetan, dan juga mendukung medan berikut dan menghindari medan. Radar beroperasi di band Ku (subset dari J band). Desain asli menggunakan pemancar TWT berbasis dengan 2-dimensi array yang antena pasif elektronik dipindai (PESA). (in)
- Le radar AN/APQ-181 est un radar à synthèse d'ouverture qualifié à (en) équipant le bombardier stratégique furtif Northrop B-2 Spirit de l'United States Air Force construit à 21 exemplaires. (fr)
- AN/APQ-181은 미국 스텔스 폭격기 B-2 스피릿에 탑재되는 AESA 레이더다. (ko)
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- AN/APQ-181 adalah sebuah sistem radar segala cuaca, probabilitas rendah intercept (LPI) yang dirancang oleh Hughes Aircraft (sekarang Raytheon) untuk pesawat bomber Angkatan Udara AS B-2A Spirit. Sistem ini dikembangkan di pertengahan 1980-an dan mulai beroperasi pada tahun 1993. APQ-181 menyediakan sejumlah mode presisi penargetan, dan juga mendukung medan berikut dan menghindari medan. Radar beroperasi di band Ku (subset dari J band). Desain asli menggunakan pemancar TWT berbasis dengan 2-dimensi array yang antena pasif elektronik dipindai (PESA). (in)
- Le radar AN/APQ-181 est un radar à synthèse d'ouverture qualifié à (en) équipant le bombardier stratégique furtif Northrop B-2 Spirit de l'United States Air Force construit à 21 exemplaires. (fr)
- AN/APQ-181은 미국 스텔스 폭격기 B-2 스피릿에 탑재되는 AESA 레이더다. (ko)
- The AN/APQ-181 is an all-weather, low probability of intercept (LPI) phased array radar system designed by Hughes Aircraft (now Raytheon) for the U.S. Air Force B-2A Spirit bomber aircraft. The system was developed in the mid-1980s and entered service in 1993. The APQ-181 provides a number of precision _targeting modes, and also supports terrain-following radar and terrain avoidance. The radar operates in the Ku band (a subset of the J band). The original design uses a TWT-based transmitter with a 2-dimensional passive electronically scanned array (PESA) antenna. (en)
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- AN/APQ-181 (en)
- APQ-181 radar (in)
- AN/APQ-181 (fr)
- AN/APQ-181 (ko)
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