The National Geospatial-Intelligence Agency (NGA), provides essential geospatial intelligence, analytical products, and information such as gravity field and elevation models to support National Security, Deflection of Vertical (DOV) and Ballistic Missile Products.
The 2 by 2 arc-minute spaced DOV data product is provided globally in terms of north-south and east-west components, with error estimates included. The unit of measurement is arc-seconds. This global coverage is repeated for a range of altitudes from 0 to 90,000 feet above mean sea level. This data is essential to the accuracy and effectiveness of high order inertial navigation systems (INS). It aids in the reduction of position and velocity error and improves orientation control when introduced into the INS solution.
NGA has a proud history of ballistic missile support for Department of Defense (DOD) systems. For decades, the nation's ballistic missile systems have relied on NGA gravity anomaly, geodetic position, and deflection values for accurate launch and in-flight navigation. Active support in the ballistic missile program continues with an annual gravity anomaly product used for Trident missile fire control and gravity surveys required for initialization of the Trident Ships Inertial Navigation System (SINS). In addition, NGA geodetic survey support continues at the DOD test ranges. As missile technology transforms away from inertial-only systems, NGA missile analysis is transforming with it. In addition to gravity data support and model analysis, NGA stands ready to apply our years of unique expertise in trajectory and target miss error analysis to today's national security systems. Also, NGA is prepared to apply this knowledge in assistance to Intelligence Community assessment of foreign missile systems.