ASTRID - Accompagnement spécifique des travaux de recherches et d’innovation défense

Bistatic model dedicated to analysis of forest environments and target detection. – MOBILE

Submission summary

We propose this project in collaboration with Dr. Mittra, Director of the EMC laboratory affiliated with the Penn State University (USA). The main objective of this proposal is to develop a model dedicated to the analysis of the electromagnetic diffracted field of large areas by using basis functions adapted to the problem of interest. This method is known under the name: Characteristic Basis Function Method (CBFM). In our case we will apply this method to study the scattered field from forest areas, with the presence of man-made targets illuminated by a space or airborne radar, in order to improve imaging / inversion /detection techniques applied to radar data.

We have already developed a “full wave” model for VHF and UHF frequencies band at the L2E, but due to its numerical complexity, it is limited to small areas of forests and low frequencies. The use of the CBFM will allow us to treat large forested areas, with targets. The analysis of targets in the domain of simulation will be managed with the same approach as the one used for the dielectric elements of the forest (trunks and branches). We will combine surface integral representation for metallic targets with volume integral representation for dielectric domain (trunks and branches).

A second phase of our collaboration will focus on the study of elements whose size is small compared to the incident wavelength by using the dipole moment formulation (DMF). This problem arises when we observe areas combining small dimension scattering elements (leaves, needles etc) associated with larger ones (trunks and branches). When we consider the lower frequencies of the band under investigation, these small elements are ignored, though their contributions must be accounted for in the upper frequency band. This second approach can also give us opportunities for new applications in the field of remote sensing such as propagation in dense media such like ice, snow or sand. It will allow us also to consider artificial materials composed of multiple sizes of inclusion (dielectric and/or conducting materials).

The main goal of our project is to realize an operational simulator dedicated to the analysis of forested areas with a man-made target in a wide frequency band (20-500 MHz). Our primary objective is to develop an end-to-end simulator, from a realistic generation of a forested area (depending on age, moisture, etc…) and targets to electromagnetic data, which could be further processed by any user for numerous applications (FOPEN, forest analysis and forest parameters retrieval). The advantages are the low cost of the modeling along with the ability to simulate almost any forest and radar configurations, which actually constitutes the original reason for the two laboratories associated in this project. Our final objective is to propose an attractive tool, which could bring together people of the same research field (forest) from different communities enabling them to work together.

A validation step is planned, it will be done on the one hand by comparison with the commercial software FEKO and secondly through measurements on scaled model in the measurement base of the CCRM (Centre Commun de Ressoureces Microondes) located in Marseille or/and in the BABI anechoïc chamber at ONERA (BABI is an indoor bistatic RCS measurement facility at ONERA, which operates between 500 MHz and 40 GHz). In order to obtain permittivities corresponding to those of wet wood we will use innovative materials including carbon nanotubes.

Project coordination

Hélène ROUSSEL (Laboratoire d'Electronique et Electromagnétisme) – helene.roussel@upmc.fr

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

UPMC-L2E Laboratoire d'Electronique et Electromagnétisme
EMC Electromagnetics Communications Lab

Help of the ANR 143,973 euros
Beginning and duration of the scientific project: December 2013 - 36 Months

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