OKTAL-SE publications

By topic

- Electro-Optic (infrared)
- Radio-Frequency (radar)
- Active-Imagery (laser)
- Satellites Navigation (GNSS)
- Company

By year

2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 | 2009 | 2008 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 | 1999 | 1998 |

Radio-Frequency (radar)

Raw data simulation of large scale environments including complex targets for synthetic SAR image generation

PIERS2017
Synthetic Aperture Radars (SAR) are considered for their all-weather capacities to achieve target detection, recognition and even identification, in the frame of surveillance, targeting and guidance systems. This type of sophisticated radar can produce high quality images with very complex features such as dihedral and corner reflector high scattering contributors, shadows and lay over effects. Besides, image quality is very dependent on the carrier velocity and trajectory. The mechanisms that govern such sensor systems are so complex that simulation ins needed to assess their performance in a large variety of operational conditions. And the synthetic environment, which means physical target and its background (terrains, buildings, vegetation and other entities) rather than just the target itself, is very import for such sensors system simulation.

Simulating complex environments for the assessment of millimeter waves sensors

EURAD2016
Guidance of weapon systems relies on sensors to analyze targets signature. Defense weapon systems also need to detect then identify threats also using sensors. One important class of sensors are millimeter waves radar systems. However, such sensors systems are so complex that they need simulation to be tested. In this context, the SE-Workbench-RF tool is presented. The basic technical choices toward an efficient solution for radar simulation are discussed and the newly included GPU implementation is described from an accuracy and computation costs point of view. RBGM radar simulation is presented as an application example of the computation kernel.

Radar echo simulation of large scale environments including complex targets

PIERS2016
Guidance of weapon systems relies on sensors to analyze targets signature. Defense weapon systems also need to detect and then identify threats also using sensors. One important class of sensors is millimeter waves radar systems that are very efficient for all weather detection. But such sensors systems are so complex that they need simulation to be tested in a large variety of operational conditions. And the synthetic environment, which means physical target and its background (terrains, buildings, vegetation and other entities) rather than just the target itself, is very import for such sensors system simulation.

Millimeter waves sensor modeling and simulation

SPIE 2015
This paper presents a state of the Art of millimeter waves sensor models. A short presentation of asymptotic methods shows that physical optics support is mandatory to reach realistic results.

SE-RAY-EM in the Air&Cosmos review

Air&Cosmos, January 2007
Following the Science and Defense price, an article was published in the "Air&Cosmos" review in France (Number 2062, 26 Janvier 2007). This article presents the main functions of the SE-RAY-EM/FERMAT software and its potential applications. Mr. Jean Latger, CEO of OKTAL-SE, also presents the different projects already achieved with the software.

SPECRAY EM / FERMAT - A NEW MODELING RADAR APPROACH FROM NUMERICAL MODELS OF TERRAIN TO SAR IMAGES

RADAR 2005
Tools for electromagnetic simulation, such as SPECRAY EM / FERMAT, a jointed development of OKTAL SE company and French ONERA EM research centre, are well adapted to RCS or ISAR image computations down to millimetre wavelength for high realistic targets described using detailed CAD files. Moreover, this type of tool can be efficiently used in order to compute the same RCS of targets but taking into account the close environment, i.e. the clutter of this target, in the same run. Besides, it is possible to use the same type of tool in order to compute a complete reflectivity map of the terrain, including targets, that can be a very nice input of SAR treatment models. The basic problem is the terrain modeling. OKTAL SE company has developed the AGETIM terrain modeling tool, with the support of ANVAR, DGA and CELAR in France. This tool enables to automatically generate a 3D terrain mesh including complete modeling of features like roads, rivers or forests. This "terrain CAD file" is enhanced with physical attributes at polygon or texture level, which enables to perform EM ray tracing computations in order to provide a virtual stimulus to SAR imagery models. This paper intends to present the whole process from geographical data to SAR reflectivity map.

FERMAT a new radar simulation approach

RADAR 2004
3D virtual databases are more and more realistic and any kind of terrain and objects can be easily modelled. A new approach in radar simulation is now possible thanks to efficiency in geometrical description and in ray tracing performance. FERMAT code is based on an ElectroMagnetic asymptotic modeling which takes advantage of these improvements for radar simulation.

Apport de la simulation au dimensionnement des contraintes CEM en haute fréquence dans un environnement complexe

CEM 2004 (in french only)
En haute fréquence, la modélisation asymptotique permet de modéliser globalement et efficacement l'environnement électromagnétique nécessaire et l'évaluation des phénomènes de compatibilité électromagnétique intersystème (CEMIS) dans un environnement complexe de grandes dimensions. Cet article décrit la technique de simulation utilisée et présente des résultats qui montrent comment elle peut être appliquée à différents domaines de l'électromagnétisme.

Application of IEM and Radiative Transfer Formulations for Bistatic Scattering of Rough Surfaces

IGARSS'02, Toronto 2002 - Canada
Systematic characterization of scattering behavior of natural and manmade rough surfaces is required in many radar applications. In general, the overall scattering response of such surfaces is composed of surface and volume scattering components. In this paper Integral Equation Method (IEM) is outlined to work out the surface scattering and the radiative transfer theory is applied to model the volume scattering.

Imaging Radar Simulation in Realistic Environment Using Shooting and Bouncing Rays Technique

SPIE 2001
A three dimensional (3-D) realistic radar simulation package including imaging radar simulation concept applied to multisensor scenarios is under development as a project between the Electromagnetism and Radar Department of ONERA and OKTAL-SE. Taking advantage of various studies in the domain, this partnership associates the expertise of ONERA in radar phenomenology, wave interaction with targets and clutter, with that of OKTAL-SE in the generation and management of realistic scene databases in the infrared and optical domains using advanced Shooting and Bouncing Rays (SBR) techniques [1, 2, 3]. The objective of this program is to develop simulation tools capable of predicting the behaviour of sensors in a realistic environment. This is achieved by coupling a terrain database completed by radar and optical features and a fast SBR algorithm. This paper is focused on the specification of the radar (i.e. electromagnetic wave interaction) principles. Outputs from the simulations illustrate the effectiveness of the tool in respectively, Synthetic Aperture Radar (SAR) simulations; and in the multisensor evaluation context in airborne applications such as enhanced vision in airport application context.

Realistic Radar Simulation package Applied to Multisensor Scenarios

Aerospace Symposium ONERA/DLR, Paris 2001 - France
A three dimensional (3-D) realistic radar simulation package applied to multisensor scenarios is under development as a project between the Electromagnetism and Radar Department of ONERA and the Oktal Synthetic Environment Company. Taking advantage of various studies in the domain, this partnership associates the expertise of ONERA in radar phenomenology, millimeter wave interaction with targets and clutter, with that of OKTAL Synthetic Environment in the generation and management of realistic scene databases in the infrared and optical domains using advanced Shooting and Bouncing Rays (SBR) techniques. The objective of this program is to develop simulation tools capable of predicting the behaviour of sensors in a realistic environment. This is achieved by coupling a terrain database completed by radar and optical features and a fast SBR algorithm.