Evaluation of Effective MDTD/MRTD for FLIR From PREOS92 Measurement Data.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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This thesis addresses the evaluation of the apparent target background temperature difference Delta Tapp at maximum range and compares ATapp with MDTDMRTD of a typical FLIR system. The atmospheric propagation code SEARAD and Plancks radiation law were employed to obtain atmospheric transmittance and path radiance. The atmospheric parameters were selected as close to the aircraft overflights as possible using PREOS 92 data as inputs of the SEARAD code. Ship target RV POINT SUR modeling was established for MDTDMRTD evaluation using a rectangular parallelepiped model of the ships physical length, width and height. The geometry data for MDTDMRTD evaluations were also selected from the PREOS 92 experiment measurement set. The MDTDMRTD functions for a generic FLIR in wide field of view WFOV application were deduced from Shumaker. Johnson criterion was employed as a detection criterion. Resolution line-pairs at detection range to resolve the target have also been evaluated and compared against Johnson Criterion. The temperature differences between ATapp and MDTD at detection range show large scatter, ranging from 5 to 600. They also show agreement with the same sensor altitude and viewing angle. A comparison of Delta Tapp with MRTD at classification range and identification range show that using NFOV would be more appropriate for target classificationrecognition. Resolution line pairs at detection range derived from a typical WFOV MRTD curve show 10 to 5O error for the eight runs, which is acceptable as compared against Johnson Criterion quoted as 1- 0.25 mRad.
- Infrared Detection and Detectors