M77 155 howitzer

[John McGillivray]

More on the GPS/IN Excalibur.

Artillery. The U.S. Army’s Excalibur 155-millimeter projectile was designed specifically to be guided in-flight. Its nosecone contains an ASIC (Application-Specific Integrated Circuit) GPS chip, a data processor chipset, and an IMU incorporating a Micro Electro-Mechanical System (MEMS). Once in flight, it deploys canards controlled by a drive guidance unit which makes use of the navigation data derived by the GPS/IMU. Compared to current 155- millimeter shells, which typically land more than 370 yards from their target, Excalibur shells could hit within 10 yards of their targets and have a much greater range (more than 35 miles).
Recently an industry team achieved a milestone in the development of long-range precision-guided projectiles in support of ground maneuver warfare. During a test, an Autonomous Naval Support Round (ANSR) fired from a 5”, 62-caliber gun flew 62 miles. The test was part of a program to develop a ballistic trajectory, GPS-guided solution to U.S. Navy, Marine Corps, and Army requirements for affordable, long-range, precise artillery. According to the team, the technology is applicable to other precision projectile systems, such as the U.S. Navy’s 155 Advanced Gun System (AGS) and the U.S. Army’s Excalibur and Multi-Role Armament and Ammunition Systems (MRAAS) programs.

http://gpsworld.com/gpsworld/article...l.jsp?id=30093

Also:
http://www.rin.org.uk/pooled/article...NEWSART_165101

http://www.raytheon.com/products/ste...s01_054624.pdf