ThispaperdescribesthedesignandconstructionofabistaticSARreceiversuitableforairborneapplications,usingorbitalSARsystems(ENVISAT,ERS-2,RADARSAT,TerraSAR-Xamongothers)asopportunitytransmitters.Thechallengeofthisdesignistoreducetherequireddatathroughputoftherecordeddata.Thisisachievedstori