|dc.contributor.author||Kobold, Michael C.||
|dc.identifier.citation||Kobold, M. C. (2000). Ocean wave earth diffraction antenna (OWEDA). Paper presented at the Proceedings of SPIE - the International Society for Optical Engineering, , 4044 91-122.||en_US
|dc.description||Ocean antenna reflector radar telescope communications FEA simulation algorithmsatellite "sea state"||en_US
|dc.description.abstract||The physical objective is to create, for a time span of about an hour, an antenna reflector with an equivalent aperture diameter
of about 300 kilometers. as shown in the last part of the introduction. To do this with the convex ocean surface requires useof
ocean surface waves. The oweda system determines the surface wave source for a given reflectivity (from a floor slide to ship
wakes). The most useful part of the oweda system is coordination of highly data intensive post processingissues involved
with transient structural analysis. Transient analysis automation tends to hide details and provide too much data. OWEDA
performs calculations and accumulate statistics during the analysis of the data so that extra storage is not necessary. The
owedaState.c report takes far less space than one time step of data, S(n) = ®(n) and the operations run in tandem, T(n) =
®(n). The time complexity analysis shows how loose bounds on some processes can be overcome by tight bounds on others
for an overall tight time complexity bound on the algorithm.
Finite Element Analysis (FEA) simulation deflection vector results. consistmg of locations and deflection values per
node, are the ocean surface simulation inputs to this owedaState.c program. After the FEA resultssimulate a set of nngs of
waves emanating out from an ocean surface dismrbance, owedaState.c calculates the total reflected power at various radio and
radar frequencies of the Earth's surface as seen by a satellite. Correlation to empirical evidence includesreflection off of
The first design used several passes to store information such as average surface roughness, curvature mapping,inflection
points, assumed wave density, and reflected power per ring. These measurements are now integratedinto one pass of postprocessing.
Future extensions of this idea include the study of celestial bodies, and careful timing data of natural events, and
interplanetary range communication.||en_US
|dc.rights||This published article is made available in accordance with publishers policy. It may be subject to U.S. copyright law.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE).||en_US
|dc.title||Ocean Wave Earth Diffraction Antenna (OWEDA)||en_US