Using SeaRad and MODTRAN to Improve the Ocean Background Model of the Electro-Optical Tactical Decision Aid (EOTDA)

摘要

This report compares the predictions of ocean radiance and detection range fromthe unmodified Electro-optical Tactical Decision Aid (EOTDA) version 3.0 with a modified version. The original EOTDA was developed by the U. S. Air Force, with only minimal attention applied to the complexities of the marine environment. The objective of this comparative study was to evaluate whether modifying the EOTDA would improve ocean background radiance predictions and ultimately improve detection range performance. The modifications involved replacing the original semi-empirical water background model with a rigorous geometric ocean radiance model, called SeaRad, and replacing the sky radiance model with the sky model from the MODTRAN 3 code. A significant difference in behavior was noted between the original and modified EOTDA when comparing the zero-range ocean background temperature predictions of both models. Because sufficient improvement was realized with the modified EOTDA employing the SeaRad ocean radiance model in combination with the MODTRAN sky radiance model, transition to the navy fleet-ready version is recommended.