Radar image modeling: a 3D spectral domain approach
We developed a 3D model to simulate the radar image formation process of natural surfaces. This 3D model is divided into two main parts. First, the radar system is modeled using a 3D point spread function (PSF). Second, the observed terrain is modeled using 3D randomly distributed scatterers as well as predetermined scatterer positions. The image formation process involved the convolution of the PSF with the terrain model, the extraction of signal envelope and sampling in the range and azimuthal directions. To enhance the computing efficiency of the convolution process we transpose the problem into the Fourier domain. Our 3D model is useful to study the parameters involved in the formation and the analysis of radar images.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
The Risk of Earthquake Damage for Roadway Systems (REDARS) 2 report provides the basic framework and a demonstration application of the Seismic Risk Analysis (SRA) methodology and its modules. It also describes results from six years of work to update the methodology, program this methodology into a public-domain software package, and test and document this software. The main modules of the REDARS 2 SRA methodology include hazards, components, system and economic. The northern Los Angeles, California highway system is used as a demonstration application of the SRA methodology. Eleven appendices are provided in PDF on the included CD-ROM. References, tables and many figures supplement the text as well.