1 Observations. Sat05_71.ppt, 2005-11-28. Directions: satellite visible with stars as background....
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Transcript of 1 Observations. Sat05_71.ppt, 2005-11-28. Directions: satellite visible with stars as background....
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Observations. Sat05_71.ppt, 2005-11-28.
• Directions: • satellite visible with stars as background.• Direction to radio-source (VLBI)
• Directions and distances: if satellite carries reflectors
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Stellar-triangulation. Sat05_71.ppt
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Global network. Sat05_71.ppt
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West-European Network.sat05_71.ppt
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North-American Network:
First results for Greenland
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Distances. Sat05_71.ppt, 2005-11-28.
Reflected light: Lasers – 2-ways.
SLR= Satellite Laser Ranging.
http://ilrs.gsfc.nasa.gov/
http://www.eos-aus.com/satellite_laser_ranging.htm
Satellite emits signal: 1 way or two ways.
http://www.gfz-potsdam.de/pb1/op/prare/prare.html
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Laser http://msl.jpl.nasa.gov/QuickLooks/lageosQL.html
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LAGEOS
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Earth-Moon system
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Distance measurements. Sat05_71.ppt, 2005-11-28.
Signal:
Impuls:
Phase:
waves.ofnumber integer N
distance.way -2 ,)(2
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Nrij
λ Δλ
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Integer ambiguity. Sat05_71.ppt, 2005-11-28.
N may be determined using
• Signal with several frequencies
• Several observations
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Distance-differences. Doppler. Sat05_71.ppt, 2005-11-28.
.Observations:
)( and )( 3221 tBtBtBtB
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Satellite Altimetry. Sat05_71.ppt, 2005-11-28.
Geos-3, GSFO
SEASAT
Topex/Poseidon, Jason,
ERS1 + 2, Envisat
and
CRYOSAT
Satellite
Water – Ice - Plains
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Satellite-to-Satellite Tracking. Sat05_71.ppt, 2005-11-28.
CHAMP, from GPS to satellite
GRACE. from GPS to two satellites and ranging between the satellites
GOCE, from GPS to the satellite
.
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Interferometry. Sat05_71.ppt, 2005-11-28.
http://www.jb.man.ac.uk/vlbi/
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VLBI. Sat05_71.ppt, 2005-11-28.
http://lupus.gsfc.nasa.gov/brochure/bintro.html
.
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Results. Sat05_71.ppt, 2005-11-28.
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