@prefix cpm: . @prefix dc: . @prefix dcat: . @prefix dce: . @prefix dct: . @prefix dcterms: . @prefix grg: . @prefix iop: . @prefix ns0: . @prefix ns1: . @prefix owl: . @prefix pav: . @prefix prov: . @prefix puv: . @prefix qudt: . @prefix rdf: . @prefix rdfs: . @prefix reg: . @prefix sdo: . @prefix semapv: . @prefix skos: . @prefix sssom: . @prefix void: . @prefix xsd: . rdf:type sdo:DefinedTerm ; sdo:description "A dual-frequency (50-140 kHz) Acoustic Doppler Current Profiling (ADCP) system that was designed and constructed at the Scripps Institution of Oceanography. The HDSS consists of a 50 kHz sonar which profiles to depths of 700–1100 m, and a 140 kHz system which profiles to 150–350 m. Both sonars are configured in the conventional 4-beam Janus geometry. The beamsare oriented 45 degrees relative to the fore/aft axis of the ship's hull. The depression angle of each beam relativeto horizontal is 60 degrees. The HDSS sonars transmit through a protective polyethelene windowmounted flush with the ships hull." ; sdo:inDefinedTermSet ; sdo:name "Scripps Institution of Oceanography Hydrographic Doppler Sonar System"@en ; sdo:termCode "TOOL0884" .