Modeling of Electromagnetic Scattering from Ships
1985
Northam, D. Y.
The purpose of this research is to develop a stochastic model of distributed radar targets, especially ships, that directly incorporate target structure and motion. The model was required to be especially useful as a tool in the stochastic simulation and analysis of tracking-radar signals over time intervals that are short relative to the time constants of the target motion. The model is based on the observation that distributed targets often appear to radar as being composed of several dominant scatters. A concept (unit-scatterer) is introduced that quantifies this observation and that leads to a useful model of distributed targets. Based on this concept and assuming the presence of over- water multipath, analytical representations of radar cross section and glint are developed, and implications of the small time-interval requirements are investigated. Using these representations, a simulation is developed and used to investigate the stochastic properties of both radar cross section and glint for an example ship target. Simulation outputs are presented and analyzed to illustrate the implications of the model given variations in the significant parameters. The model was developed to incorporate the major strengths of the existing deterministic and stochastic models: ability to account directly for target structure and motion, and ease of obtaining targeting-signature time series, respectively. The deterministic models, though precise, are extremely inefficient in generating these time series and require a great deal of information about target structure and motion. The stochastic models do not directly account for target structure and motion and rely heavily on target measurements.
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