APQ-181 radar

The AN/APQ-181 is an all-weather, low probability of intercept (LPI) 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 and terrain avoidance. The radar operates in the K_u 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. All B-2 aircraft are expected to have the upgraded radar by 2010.

ee also

*List of radars
*Joint Electronics Type Designation System (JETDS)

External links

* [http://www.raytheon.com/products/apq181/ Raytheon product description]
* [http://www.spacedaily.com/news/plane-b2-03a.html spacedaily.com article]
* [http://www.airforce-technology.com/projects/b2/ airforce-technology.com article]