MODTRAN interoperability Overview OPTIS SAS September 5 th

MODTRAN interoperability Overview OPTIS SAS September 5 th, 2013

Platform September 23, 2021 2

Applications Define a context in which an optical system is going to be used to determine hardware specifications for such device What is the optical signature of the target? What is the atmosphere impact? What is the environment impact? September 23, 2021 3

Product functionalities Ambient source extension to infrared September 23, 2021 Long distance observation Atmosphere attenuation 4

About MODTRAN MODerate resolution TRANsmission Widely used as a standard atmospheric model in: • Defense industry (Air Force Research Laboratory • • standard) Atmosphere research Climatic research Spectral range valid for (λ > 0. 2µm) Atmosphere model: • Stack of 33 concentric layers with homogeneous properties MODTRAN solves the radiative transfer, taking into account: • Solar and lunar illumination, • Single and multiple scattering • Specular and diffuse reflections • Ground atmospheric thermal contribution Overview of MODTRAN source emission contributions (*): A. Berk, * L. S. Bernstein, * G. P. Anderson, † P. K. Acharya, * D. C. Robertson, * J. H. Chetwynd, † and S. M. Adler-Golden. (1998) , MODTRAN Cloud and Multiple Scattering Upgrades with Application to AVIRIS, in REMOTE SENS. ENVIRON. , 65: 367– 375 September 23, 2021 5

Interoperability with SPEOS • MODTRAN is used by SPEOS to build physical data-based ambient sources. • Ambient source model is extended to infrared wavelengths and takes into account thermal contribution from sky and ground. • Combining a radiance sensor to an ambient source with MODTRAN: • Atmosphere spectral attenuation can be simulated, • Sensor can be positioned up to 300, 000 km far away from the scene no CAD limitation! Line-of-sight allowed in SPEOS: 1. A flying object observing a terrestrial scene, 2. A satellite scanning ground scene. September 23, 2021 6

Workflow Thermal signature characterization to dimension a detection system Scenario • • Digital Mock Up Simulation result CAD model Optical properties Thermal signatures MODTRAN sky model September 23, 2021 7

Civilian identification for search and rescue Observation of a mountain area with endangered civilian groups Sensor placed on a helicopter flying at 3. 55 km height Visible range Near-infrared Mid-infrared Far-infrared 80 m 150 m Distressed civilians September 23, 2021 8

Maritime transport security Speed boat observation by day, with a clear weather Sensor placed on a helicopter flying at 1. 5 km height Mid-infrared Visible range Pirates and their speedboat Motor at 40°c. Far-infrared September 23, 2021 9

Maritime transport security Speed boat observation by night with some mist above the sea Sensor placed on a helicopter flying at 1. 5 km height Mid-infrared Visible range Pirates and their speedboat Motor at 40°c. Far-infrared September 23, 2021 10