The GEOSAT (GEOdetic SATellite) was a U.S. Navy Earth observation satellite, launched on March 12, 1985 into an 800 km, 108° inclination orbit, with a nodal period of about 6040 seconds. The satellite carried a radar altimeter capable of measuring the distance from the satellite to sea surface with a relative precision of about 5 cm. The initial phase was an 18-month classified Geodetic Mission (GM) have a ground-track with a near-23-day repeat with closure to within 50 kilometers. The effect of atmospheric drag was such that by fail 1986 GEOSAT was in an almost exact 23-day repeat orbit.

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dbo:abstract
  • Geosat (Geodetic Satellite) war ein Erdbeobachtungssatellit der US Navy, der mit einem Radar-Altimeter ausgerüstet war und der Satellitengeodäsie und der Ozeantopographie diente. Der Satellit wurde am 12. März 1985 auf einer abgerüsteten und zum Satellitenträger umgebauten Atlas-E-Interkontinentalrakete von der Vandenberg AFB in einen polaren Erdorbit (757 x 814 km, 108,1°) gestartet. (de)
  • Geosat (Geodetic Satellite) es un satélite artificial de la Armada de los Estados Unidos lanzado el 13 de marzo de 1985 mediante un cohete Atlas desde la base aérea de Vandenberg. Estaba diseñado para medir la altura de la superficie marina con una precisión de 5 cm mediante radar. La misión consistía en dos partes: una primera, de año y medio de duración, clasificada y realizada para la Armada; y una segunda parte, denominada ERM (Exact Repeat Mission), que comenzó el 8 de noviembre de 1986 y duró hasta enero de 1990, en que el falló de las dos grabadoras a bordo del satélite finalizó las operaciones. Durante la segunda parte de la misión se recogieron más de tres años de datos altimétricos que se pusieron a disposición de la comunidad científica. El satélite se estabilizaba mediante gradiente gravitatorio. (es)
  • The GEOSAT (GEOdetic SATellite) was a U.S. Navy Earth observation satellite, launched on March 12, 1985 into an 800 km, 108° inclination orbit, with a nodal period of about 6040 seconds. The satellite carried a radar altimeter capable of measuring the distance from the satellite to sea surface with a relative precision of about 5 cm. The initial phase was an 18-month classified Geodetic Mission (GM) have a ground-track with a near-23-day repeat with closure to within 50 kilometers. The effect of atmospheric drag was such that by fail 1986 GEOSAT was in an almost exact 23-day repeat orbit. After the GM concluded 30 September 1986, GEOSAT's scientific Exact Repeat Mission (ERM) began on November 8, 1986 after being maneuvered into a 17.05 day, 244 pass exact repeat orbit that was more favorable for oceanographic applications. When the ERM ended in January 1990, due to failure of the two on-board tape recorders, more than three years of ERM data were collected and made available to the scientific community. The Geosat GM goal was to provide information on the marine gravity field. If the ocean surface were at rest, and to forcing such as tides or winds were acting on it, the water surface would lie along the geoid. To first order, the Earth shape is an oblate spheroid. Subsurface features such as seamounts create a gravitational pull, and features such as ocean trenches create lower gravity areas. Spatial variations in gravity exert influence on the ocean surface and thereby cause spatial structure in the geoid. The deviations of the geoid from the first order spheroid are on the order of ± 100m. By measuring the position of the water surface above the Earth center, the geoid is observed, and the gravity field can be computed through inverse calculations. The U.S. Navy declassified parts of the Geodetic Mission data in 1990 that covered a doughnut-shaped area of ocean that surrounds Antarctica between 60 and 72 degrees south latitude. In 1992, further parts of the Geodetic Mission data over the oceans south of 30 degrees south were released. The GEOSAT data for the entire global sea surface was declassified in July 1995 after the competition of the geodetic phase of ESA ERS-1 mission. These data were subsequently widely used to estimate ocean bathymetry along with additional satellite altimeters. Once the GM goal had been reached, the satellite still had a useful life. An opportunity existed to observe the next order physical process that affects the ocean surface. Currents, tides and wind forcing all create changes in water levels. While there are extreme waves and events (tsunamis and hurricane surge), typical ocean features would be considered large if the water level change caused by them were 1 m. Most areas of the world experience features of typical amplitude of 20 cm. The ERM established the satellite in an exact repeat orbit. The satellite would orbit the Earth, and after 17.05 days the satellite would return to the same point. The satellite was actively controlled through thrust maneuvers to maintain the exact repeat orbit to within 1 km of the predefined ground track. In this manner, the satellite could observe long term changes at the points along the ground track. (en)
  • Geosat (GEOdetic SATellite) est un satellite de la Marine de guerre américaine lancé en 1985 qui a assuré la première mission d'altimétrie satellitaire fournissant des données de qualité. Durant la première partie de sa mission il a effectué un relevé du géoïde marin à l'aide d'un altimètre radar. Durant la deuxième phase de la mission il a été placé sur une orbite phasée de 17 jours et a été mesuré le niveau des océans et ses variations jusqu'à son arrêt en 1990. Le satellite GFO (Gedeosat follow on) a pris sa suite à partir de 1998. (fr)
  • GEOSAT (GEOdetic SATellite) era un satellite di osservazione terrestre della Marina Militare Statunitense lanciato il 12 marzo 1985, equipaggiato con un altimetro radar in grado di misurare la distanza tra il satellite e la superficie del mare con una precisione relativa di circa 5 cm. (it)
  • Geosat (Geodetic Satellite) – amerykański wojskowy satelita geofizyczny. Jeden z pierwszych satelitów do pomiaru wysokości powierzchni wód oceanicznych i pola grawitacyjnego Ziemi. Pierwszy prowadzący takie obserwacje w sposób długoterminowy. Dane naukowe zebrane podczas jego misji uważane są za kluczowe w rozwoju oceanografii i geodezji satelitarnej. (pl)
  • O Geosat (acrónimo em inglês para: Geodetic Satellite) foi um satélite artificial da Marinha dos Estados Unidos lançado em 13 de março de 1985 por um foguete Atlas da Base Aérea de Vandenberg, Califórnia. Ele foi projetado para medir a altura da superfície do mar, com uma precisão de 5 cm por radar. A missão consistia em duas partes: a primeira em um ano e meio, classificadas e fez para a Marinha, e uma segunda parte, chamada de ERM (Repeat Mission Exatas), que começou no dia 8 de novembro de 1986 e durou até janeiro 1990, quando ele deixou os dois gravadores a bordo do satélite cessou operações. Durante a segunda parte da missão foram coletados ao longo de três anos de dados de altimetria é disponibilizado para a comunidade científica. O satélite era estabilizado por gradiente de gravidade. (pt)
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  • 1985-021A
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  • Artist's interpretation of the Geosat satellite
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dct:subject
http://purl.org/linguistics/gold/hypernym
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  • Geosat (Geodetic Satellite) war ein Erdbeobachtungssatellit der US Navy, der mit einem Radar-Altimeter ausgerüstet war und der Satellitengeodäsie und der Ozeantopographie diente. Der Satellit wurde am 12. März 1985 auf einer abgerüsteten und zum Satellitenträger umgebauten Atlas-E-Interkontinentalrakete von der Vandenberg AFB in einen polaren Erdorbit (757 x 814 km, 108,1°) gestartet. (de)
  • Geosat (GEOdetic SATellite) est un satellite de la Marine de guerre américaine lancé en 1985 qui a assuré la première mission d'altimétrie satellitaire fournissant des données de qualité. Durant la première partie de sa mission il a effectué un relevé du géoïde marin à l'aide d'un altimètre radar. Durant la deuxième phase de la mission il a été placé sur une orbite phasée de 17 jours et a été mesuré le niveau des océans et ses variations jusqu'à son arrêt en 1990. Le satellite GFO (Gedeosat follow on) a pris sa suite à partir de 1998. (fr)
  • GEOSAT (GEOdetic SATellite) era un satellite di osservazione terrestre della Marina Militare Statunitense lanciato il 12 marzo 1985, equipaggiato con un altimetro radar in grado di misurare la distanza tra il satellite e la superficie del mare con una precisione relativa di circa 5 cm. (it)
  • Geosat (Geodetic Satellite) – amerykański wojskowy satelita geofizyczny. Jeden z pierwszych satelitów do pomiaru wysokości powierzchni wód oceanicznych i pola grawitacyjnego Ziemi. Pierwszy prowadzący takie obserwacje w sposób długoterminowy. Dane naukowe zebrane podczas jego misji uważane są za kluczowe w rozwoju oceanografii i geodezji satelitarnej. (pl)
  • The GEOSAT (GEOdetic SATellite) was a U.S. Navy Earth observation satellite, launched on March 12, 1985 into an 800 km, 108° inclination orbit, with a nodal period of about 6040 seconds. The satellite carried a radar altimeter capable of measuring the distance from the satellite to sea surface with a relative precision of about 5 cm. The initial phase was an 18-month classified Geodetic Mission (GM) have a ground-track with a near-23-day repeat with closure to within 50 kilometers. The effect of atmospheric drag was such that by fail 1986 GEOSAT was in an almost exact 23-day repeat orbit. (en)
  • Geosat (Geodetic Satellite) es un satélite artificial de la Armada de los Estados Unidos lanzado el 13 de marzo de 1985 mediante un cohete Atlas desde la base aérea de Vandenberg. Estaba diseñado para medir la altura de la superficie marina con una precisión de 5 cm mediante radar. El satélite se estabilizaba mediante gradiente gravitatorio. (es)
  • O Geosat (acrónimo em inglês para: Geodetic Satellite) foi um satélite artificial da Marinha dos Estados Unidos lançado em 13 de março de 1985 por um foguete Atlas da Base Aérea de Vandenberg, Califórnia. Ele foi projetado para medir a altura da superfície do mar, com uma precisão de 5 cm por radar. O satélite era estabilizado por gradiente de gravidade. (pt)
rdfs:label
  • Geosat (de)
  • Geosat (en)
  • Geosat (es)
  • Geosat (it)
  • Geosat (fr)
  • Geosat (pl)
  • Geosat (pt)
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