4 presented a ray tracing approach for simulating appearance of basic building shapes. 3 approximated the double reflection in his simulation approach. This simulation was limited to direct backscattering only. The main motive was to provide the test data for automated object identification. (1980) 2 simulating SAR image signature of airplanes.
For instance, ray tracing methods are applied in Wohler et al. Image simulators are applied for the purpose of providing a priori knowledge about man-made objects.
#CST MICROWAVE STUDIO MESH SETTINGS SIMULATOR#
Extended scene simulator needs a more sophisticated backscattering model. Point simulator is focused on system parameters and might rely upon an artificial scene. Another classification about evaluation of backscattering is ‘point’ and ‘extended scene’ simulator. SAR raw data simulators are developed to provide test data for processing algorithms or radiometric analysis. In a SAR image simulator, the object of simulation is the image which is generated by appropriate input data with no availability of any intermediate product.
1 introducing ‘SAR Image simulator’ and ‘SAR raw data simulator’. Relevant categorization in SAR simulation is made by Giorgio at el.
#CST MICROWAVE STUDIO MESH SETTINGS SOFTWARE#
The software will allow to model scatterers of different materials arranged in variable geometries. For this purpose, we will make use of the CST software of Computer Simulation Technology AG, Darmstadt. Methods with large computational efforts allow to simulate the SLC signal pixel by pixel considering all object details. Then electromagnetic surface characteristics as well as radiometric sensor characteristics must be considered. This simulation can provide valuable information to clarify which real world objects cause images suitable for high accuracy identification in the SAR images.īased on acquired/given object geometries SAR image data can be simulated for certain antenna positions. Range compression, range cell migration correction (RCMC), and azimuth compression are applied in time domain to obtain the final SAR image. Hilbert transform is applied to convert the real signal to complex data with phase information.
Exported data from CST is arranged into a 2-d matrix of axis range and azimuth. The time domain solver in CST is based on the solution of differential form of Maxwells equations. This is analogous to an array antenna and is synthesized to create a long aperture for SAR processing. Defining mesh and other appropriate settings reflected wave is measured at several distant points within a line parallel to the viewing direction. Within CST Microwave Studio a replica of TerraSAR-X chirp signal is incident upon a modeled Corner Reflector (CR) whose design and material properties are identical to that of the real one. Raw data is later focused in MATLAB using range-doppler algorithm. This paper presents the use of a general purpose electromagnetic simulator, CST, to simulate realistic synthetic aperture radar (SAR) raw data of three-dimensional objects.