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L. Gardenal (CS, France) D. Dion (RDDC-Valcartier, Canada) F. Lapierre (ERM, Belgium) E. Mandine (CS, France). Performances prediction of optronic sensors in maritime environment ITBMS 2011 – 27-30 June. Outline. Frame Overview on the LIBPIR library First results Future work Perspectives.
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L. Gardenal (CS, France)D. Dion (RDDC-Valcartier, Canada)F. Lapierre (ERM, Belgium)E. Mandine (CS, France) Performances predictionof optronic sensors inmaritime environment ITBMS 2011 – 27-30 June
Outline • Frame • Overview on the LIBPIR library • First results • Future work • Perspectives
Frame • Since more than 10 years, CS works on optronic projects in different context (MWPS [maritime security], Basirn [IR images data base], Sypir, …) • 3 years ago, CS has decided to invest on the development of a calculation library for predicting performances of optronic sensor • LIBPIR is the pedestal of a future PREDIR • First version of LIBPIR has just been completed by CS with the help of DRDC Valcartier and ERM • SMARTI : computational module developped by DRDC (Defence R&D Canada) including MODTRAN • OSMOSIS : opensource library developped by ERM (Royal Military Academy of Belgium) • It is currently integrated in the French Navy TDA « PSAD » by DCNS group • PSAD will provide the future french frigate FREMM with AC/EM/IR sensor performance assessment
LIBPIR Calculation components • SMARTI (DRDC-Valcartier) • Spectral and wideband CK transmittance & radiance • MODTRAN molecular extinctions (CK) • Marine surface layer model • MODTRAN and DRDC aerosol models • DRDC accurate refracted path calculation • Lambert and Sea surface (DRDC analytical model) BRDF • Reference: DENIS DION • Osmosis (ERM) • Open-source target surface temperature Modeling Software • Fast and robust software • Validation : CUBI project • Reference: FABIAN LAPIERRE or www.osmosis-project.org
First resultsInfluence of environment on performances of optronic sensors • Sensor: • 3 FOV: • 40°x30° (for short ranges) • 5°x3.75°(for medium ranges) • 2°x1.5° (for long ranges) • Height: 10 m • MidWave • Environment: • 3 RH: 50, 80 and 95% • 3 WSPD: 5, 10 and 15 m/s • 3 ASTD: -10, 0 and 10 °C • Advective and radiative fogs • 12h00 // MAY 2010 • Place: Mediterranean sea (South of France) • Target: Destroyer
First results First task: Definition of optical properties on the target Albedo = 0.5 50°C Albedo = 0.9 Albedo = 0.1 VISIBLE / 12h00
First results IR signature: influence of the optronic band VISIBLE SWIR LWIR MWIR
First results Influence of ASTD on an optronic scene 10 km 20 km 5*3.75° ASTD = +10°C ASTD = -10°C ASTD = 0°C
First results Influence of ASTD on an optronic scene ASTD = 0°C ASTD = +10°C ASTD = -10°C 20 km • Apparition of mirage (ASTD < 0°C) • Compression of target image (ASTD growing) • Variation of optical horizon • Limitation of the target detected form (ASTD < 0°C) 2*1.5°
ASTD = -10°C ASTD = +10°C Range = 4.5 km
ASTD = -10°C ASTD = +10°C Range = 5.6 km
ASTD = -10°C ASTD = +10°C Range = 6.7 km
ASTD = -10°C ASTD = +10°C Range = 7.8 km
ASTD = -10°C ASTD = +10°C Range = 8.9 km
ASTD = -10°C ASTD = +10°C Range = 10.0 km
ASTD = -10°C ASTD = +10°C Range = 11.1 km
ASTD = -10°C ASTD = +10°C Range = 12.2 km
ASTD = -10°C ASTD = +10°C Range = 13.3 km
ASTD = -10°C ASTD = +10°C Range = 14.4 km
ASTD = -10°C ASTD = +10°C Range = 15.5 km
ASTD = -10°C ASTD = +10°C Range = 16.6 km
ASTD = -10°C ASTD = +10°C Range = 17.7 km
ASTD = -10°C ASTD = +10°C Range = 18.8 km
ASTD = -10°C ASTD = +10°C Range = 19.9 km
ASTD = -10°C ASTD = +10°C Range = 18 km
ASTD = -10°C ASTD = +10°C Range = 16.6 km
ASTD = -10°C ASTD = +10°C Range = 15.5 km
ASTD = -10°C ASTD = +10°C Range = 14.4 km
ASTD = -10°C ASTD = +10°C Range = 13.3 km
ASTD = -10°C ASTD = +10°C Range = 12.2 km
ASTD = -10°C ASTD = +10°C Range = 11.1 km
ASTD = -10°C ASTD = +10°C Range = 10.0 km
ASTD = -10°C ASTD = +10°C Range = 8.9 km
ASTD = -10°C ASTD = +10°C Range = 7.8 km
ASTD = -10°C ASTD = +10°C Range = 6.7 km
ASTD = -10°C ASTD = +10°C Range = 5.6 km
ASTD = -10°C ASTD = +10°C Range = 4.5 km
ASTD = -10°C ASTD = +10°C Range = 4.5 km
ASTD = -10°C ASTD = +10°C Range = 4.5 km
First results Fog examples ADVECTIVE RADIATIVE LWC = 0.01 g/m3 Range = 1 km LWC = 0.01 g/m3 Range = 1 km LWC = 0.01 g/m3 Range = 0.5 km LWC = 0.01 g/m3 Range = 0.5 km
Some first performance results • Contraste max • Detection probability (PoD) • Max value • Using « noise equivalent irradiance » (5e-9 W/m2) for calculating signal to noise ratio • Using Detection probability curves • Pfa = 10-5 • DRI ranges • Based on Jonhson Critera (NvTherm approach) • Acquistion probability = 0.99
First conclusions • LibPir results coherent with what is expected: • Contrast is better with • Low relative humidity (small differences) • Low wind speed • System PoD is better with: • Low relative humidity (small differences) • Low wind speed • Estimation of DRI sensor performances: Better with low relative humidity and low wind speed • LibPir calculation time: 1 to few minutes • Calculation coherent along the atmospheric column • Marine surface layer characteristics are taken into account • refraction • presence of sea aerosol particles • humidity gradient