This report presents an overview of sea surface multipath effects on accurate determination of effective radiated power (ERP) data from ship navigation radars over a 5-20 nautical mile region. The intent is to characterize the various multipath phenomena affecting signal characterization. Data was collected for several hundred ship radars, and various refractivity and multipath programs utilized to model the effect.
This report presents an overview of existing computer models available for antenna design and performance evaluation. It discusses the various solution techniques, such as the method of moments, finite element and high frequency (asymptotic) techniques, and their limitations with respect to frequencies, computer resources available, and antenna type and surrounding structures needed to be modeled. Sample problems are presented along with availability of the codes. Current areas of research are ...
Theoretical predictions based on temperature dependent rate equations are made of the pulse response of the individual axial modes of high power laser diodes. The temperature transients in the active area of the lasers are simulated with a finite element code and entered into the rate equations which describe the time evolution of both the carrier population and the photon number inside the laser cavity. Experimentally, the laser diodes are ...
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