简介：Duringthepastfewyears,theterahertz(THz)frequencyregimehashadrenewedscientificandtechnologicalinterestbecauseofrecentbreakthroughsintheareasofhighpowersources,sensitivedetectors,novelmaterials,andhighresolutionvideoimaging.Becauseitliesbetweentheradiofrequenciesandinfraredwavelengths,theterahertzelectromagneticregionwasthoughttobepromisingforpracticalapplications(300micrometerswavelengthcorrespondsto1THzfrequency),butitsufferedfromveryhighattenuationthroughtheatmosphere(above1dB/meter),andwasfoundtobedifficulttogenerate,modulate,anddetect.Ontheotherhand,manynon-polardielectricmaterialsaretransparenttoTHzwaves,allowingthedetectionofinclusions,internalinhomogeneities,ormaterialsbehinddielectricobstaclesfor

简介：Thispaperstudiesthedevelopmentonthefirstorderseacluttercrosssectionforbistatichighfrequencysurfacewaveradar(HFSWR).Basedonthereceivedfirstorderelectricfieldexpression,aclosed-formofcrosssectionsisderivedtoaccountforthecaseofreceivingantennaarraybeingmountedontheshipborneplatform.Theuniformlinearmotionandswaymotioncomponentsareassumedtoberesponsiblefortheobserveddifferencesincomparisonwiththebistaticfixedantennacase.Correspondingly,simulationsareconductedtostudytheseaclutterspectralcharacteristicsforthesetwocasesversusdifferentsystemparametersandseastateconditions.ItisshownnumericallythattheforwardmotioncomponentwillspreadtheBragglinesseverelyandtheinfluencetriggeredbytheswaymotioncanbeexplainedastheBesselfunctionmodulationoftheordinaryseaclutterspectra.TheobtainedresultshaveimportantimplicationsintheapplicationofshipborneHFSWRtechnologytooceanremotesensingandtargetdetection.