Utilizing Ground-Based Simulation to Validate High Altitude Plume Signature Codes in Support of Theater Missile Threat Detection and Tracking

Physical Sciences Inc. (PSI) proposes to utilize a ground-based simulation facility based upon its patented FAST technology to obtain critical velocity dependent cross section data necessary to validate and extend the capabilities of the DoD’s primary high altitude plume signature code: SOCRATES-P. Far-field plume signatures arise from the hyperthermal interaction of rocket plume effluent with the atmosphere at altitudes greater than about 90 km. In Phase I we propose to use the tunable, hypervelocity oxygen atom source (5-12 km/s) of FAST to measure the velocity dependent cross section of O-atoms reacting with one selected component of the thruster exhaust with products emitting in key sensor bands. The data will be compared to computational chemistry results from Spectral Sciences Inc. The end product of the SBIR research will be updates to the cross section database in SOCRATES-P enabling increased accuracy of plume-signature predictions. Phase I will also design an upgrade to the FAST facility enabling measurements of key plume signature phenomena involving multiple hyperthermal interactions of plume species with atmospheric O/N2. This new capability will be implemented in the Phase II program enabling evaluation of far-field plume signatures primarily associated with lower altitudes (< 100 km) relevant to theater missiles.