@prefix ns0: . @prefix skos: . ns0:altLabel [ ] ; skos:definition """NASA GSFC's Radar Ocean Wave Spectrometer (ROWS) is an airborne remote sensor used to support the development and refinement of satellite radars that measure the ocean surface. The short-pulse Ku-band radar is specifically configured to measure the directional spectrum of ocean swell. In addition, the system is being used to study near-nadir ocean backscatter and its relation to wind waves. The sensor is typically flown on one of several NASA aircraft and is potentially available for outside use in funded ocean research efforts. Currently, ROWS research efforts are aimed at improving the interpretation of ocean data collected using the satellite SAR (ERS-1), altimeter(TOPEX) and scatterometer (NSCAT). The airborne system has participated in numerous ocean surface measurement programs since since the late 1970s. ROWS has been installed on numerous aircraft, most recently NASA/GSFC/WFF's T-39 and P-3B. The system is typically operated from altitudes of 5-10 km. The high-range-resolution radar generates data using two distinct, continuously-operating modes. Spectrometer mode data are collected with a near-vertically-pointing, pencil-beam antenna which rotates in azimuth. These data are used to derive two- dimensional ocean wave spectral estimates and near-nadir directional radar backscatter information. Concurrent pulse-limited altimeter mode radar returns are derived using a vertically-pointed horn antenna. Ocean significant wave height and surface wind speed are inferred from the altimeter return. A table below provides the radar system's characteristics. ROWS Instrument Characteristics Frequency 13.9 Ghz Pulse Type linear FM, 100 MHz bandwidth,1.2 us chirp Pulse length 12.5 n, compressed Peak power 2 kW PRF 100 Hz Dynamic range 70 dB Detection noncoherent, square law Antennas A)10 by 40 (elevation by azimuth)printed circuit array, vertical polarization,16 deg. boresight,6 rpm rotation rate B)vertically-pointing 290 pyramidal horn Data system PC-based with full waveform capture using a 100 or 500 MHz digitization rate For more information on ROWS see: "http://rows.wff.nasa.gov/" For information on the ROWS Project see: "http://rows.wff.nasa.gov/overview.html\""""@en ; skos:prefLabel "ROWS"@en ; skos:inScheme ; skos:broader ; a skos:Concept . skos:prefLabel "Radar Spectrometers"@en ; a skos:Concept ; skos:narrower .