AAWSAP DIRD, Detection and High-Resolution Tracking of Vehicles at Hypersonic Velocities, November 2010

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There are a number of different techniques available to detect hypersonic objects and to
determine their position, velocity, and trajectory. These detection methods can be broadly
divided into electromagnetic, optical, and acoustic/seismic methods. Each method relies on
the properties of the surface of the object to reflect incident radiation or upon the properties
of the hot ionized gases caused by the bow shock and entrained into the object's wake. The
theory of external fluid flow around objects in subsonic, supersonic, and hypersonic regimes
will be reviewed and various detection methods will be compared in this report.
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