Reference Systems Flashcards
What is one use of Satellite Altimetery?
Global Monitoring of sea level
What are the requirements for highly accurate measurement of sea level?
- Highly accurate measurement of distance
- Highly accurate Measurement of Satellite Orbit
How can Satellite orbit and distance of satellite from sea level be measured?
Satellite Laser Ranging (SLR)
and
Radar Altimetery
What is an alternative methods for determining satellite height?
- Doppler Orbitography (DORIS)
- Global Navigation Satellite Systems (GNSS)
What is GGOS?
Global Geodetic Observation System
What is an important GGOS Core Sites?
Geodetic Observatory Wettzell
What is ITRS
International Terrestrial Reference System
What are some uses of ITRS?
- Global positioning/navigation
- Surveying and mapping
- Geo-referencing
Define the ITRS System
- Geocentric with earth’s center of mass as origin
x- and y- axis are conventional equatorial planes
x- axis through the meridian of Greenwich
z- axis towards the conventional terrestrial pole(CTP)
- scale is meter
What is ITRF
International Terrestrial Reference Frame
Name four parts of the ITRF
- Radio Telescopes
- GNSS Stations
- Satellite Ranging Stations
- Doppler Antennas
Why must ITRS be realized repeatedly?
Earthquakes and time dependency
What id target accuracy of ITRF?
- 1mm for position
-0.1 mm for change of position/year
What is the coordinating body for the ITRS?
International Association of Geodesy (IAG) under the roof of IERS International Earth Rotation and Reference System Services
Name one of the three ITRS Combination Centers
DFGI-TUM
