@prefix cpm: . @prefix dc: . @prefix dcat: . @prefix dce: . @prefix dct: . @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 semapv: . @prefix skos: . @prefix sssom: . @prefix void: . skos:member . skos:narrower . skos:altLabel "Poseidon-2" , "Poseidon-2"@en ; skos:broader ; skos:definition "Poseidon-2 is a radar altimeter designed to measure ocean topography, significant wave height and surface wind speed. It is also able to measure the amount of rain in the atmosphere. The Poseidon-2 altimeter emits a radar beam that is reflected back to the antenna from the Earth's surface. Poseidon-2 operates at two frequencies (in the Ku and C bands) to determine atmospheric electron content, which affects the radar signal path delay. These two frequencies also serve to measure the amount of rain in the atmosphere. Poseidon-2 operates at 13.6 GHz in the Ku band and 5.3 GHz in the C band. It has a pulse duration of 105 microseconds and a bandwidth of 320 MHz. The altimeter is nadir-only viewing, sampling at 30 km intervals along-track. Flown on JASON-1. http://www.aviso.altimetry.fr/en/missions/past-missions/jason-1/instruments/poseidon-2.html"@en ; skos:inScheme ; skos:notation "SDN:L22::TOOL1044" ; skos:note "accepted"@en ; skos:prefLabel "Poseidon-2"@en . skos:narrower .