OKTAL-SE publications

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- Electro-Optic (infrared)
- Radio-Frequency (radar)
- Active-Imagery (laser)
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2009

A presentation of ATR processing chain validation procedure of IR terminal guidance version of the AASM modular air-to-ground weapon

Download PDF SPIE 2009
Developed by Sagem (SAFRAN Group), the AASM is a modular Air-To-Ground "Fire and Forget" weapon designed to be able to neutralise a large range of targets under all conditions. The AASM is composed of guidance and range enhancement kits that give bombs, already in service, new operational capabilities. AASM Guidance kit exists in two different versions. The IMU/GPS guidance version is able to achieve "ten-meter class" accuracy on target in all weather conditions. The IMU/GPS/IR guidance version is able to achieve "meter class" accuracy on target with poor precision geographic designation or in GPS-denied flight context, thanks to a IR sensor and a complex image processing chain.

Aircraft infrared signature, taken into account body, engine and plume contributions

Download PDF ITBMS 2009
The IR signature of an aircraft is the result of several major contributions, namely: - Hot engine parts of the tail pipe and/or the air intakes - Combustion hot gases (and in some cases hot carbon particles) in the plume - Skin of the airframe, due to the thermal emission resulting from aerodynamic heating and internal heat sources and the reflected ambient radiation from the sun, the sky and the ground. The aim of this paper is to explain how the combination of CFD++, CFD computational code, RadTherm-IR, 3D thermal computational code and SE-Workbench-EO from OKTAL-SE is an adequate solution for computing the IR signature of a jet aircraft taking all this major into account.

Simulation of Active EO Imaging System based on SE-Workbench and OSMoS software tools

Download PDF ITBMS 2009
Active EO imaging systems are more and more considered as an outstanding solution for detection/recognition or guidance purposes in severe atmospheric conditions such as heavy fogs or in the presence of smoke due to flares in smoke-producing devices. In particular, flash laser systems that have range gating capabilities enable the elimination of photons that are backscattered by the particles in the atmosphere and hence improve the systems detection performances. Range gated systems also offer recognition/identification capabilities based on the target shape identification. Thus it is of great interest to be able to assess the performances of such systems in different operational conditions and simulation is a good means to do this. The SE-Workbench workshop, also called CHORALE (French acceptation for "simulated Optronic Acoustic Radar battlefield") is used by the French DGA to perform multi-sensors simulations. CHORALE enables the user to create virtual and realistic multi spectral 3D scenes, and then generates the physical signal received by a sensor, typically an IR sensor.

The coupling of MATISSE and the SE-WORKBENCH: a new solution for simulating efficiently the atmospheric radiative transfer and the sea surface radiation

Download PDF SPIE 2009
The SE-WORKBENCH workshop, also called CHORALE (French acceptation for "simulated Optronic Acoustic Radar battlefield") is used by the French DGA (MoD) and several other Defense organizations and companies all around the World to perform multi-sensors simulations. CHORALE enables the user to create virtual and realistic multi spectral 3D scenes that may contain several types of target, and then generate the physical signal received by a sensor, typically an IR sensor. MATISSE [4,5] is a background scene generator developed for the computation of natural background spectral radiance images and useful atmospheric radiative quantities (radiance and transmission along a line of sight, local illumination, solar irradiance...). Backgrounds include atmosphere, low and high altitude clouds, sea and land. A particular characteristic of the code is its ability to take into account atmospheric spatial variability (temperatures, mixing ratio, etc) along each line of sight. An Application Programming Interface (API) is included to facilitate its use in conjunction with external codes. The paper will demonstrate the advantages for the SE WORKEBENCH of using MATISSE as a new atmospheric code, but also for computing the radiative properties of the sea surface.

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