Weproposeaspeckle-reductionmethodbasedonwavelengthcharacteristicsofspeckleeffectinsyntheticapertureimagingladar(SAIL).Thereturnsignal,whichisthebackscatteringfieldwithspeckleeffectfromtheroughsurfaceoftarget,canbeintegratedoverNchirpperiodsandheterodynedetectedwithalocal-oscillatorsignal.Afterperformingimageprocessingrespectively,thefinalimagecanberegardedastheincoherentsuperpositionoftheNsub-images.Numericalsimulationsindicatetheeffectivenessofthismethod.OurresearchmayfacilitatepracticalapplicationsofSAIL.
