Radio occultation

Source: Wikipedia, the free encyclopedia.
Radio occultation analysis of signal delay by the tandem FORMOSAT-3/COSMIC used as atmospheric sounding.

Radio occultation (RO) is a

ring system. Other satellite carriers onboard GNSS-Radio occultation include CHAMP (satellite), GRACE and GRACE-FO, MetOp and the recently launched COSMIC-2.[1]

Atmospheric radio occultation

Atmospheric radio occultation relies on the detection of a change in a radio signal as it passes through a planet's atmosphere, i.e. as it is

Doppler shift of the signal given the geometry of the emitter and receiver. The amount of bending can be related to the refractive index by using an Abel transform on the formula relating bending angle to refractivity. In the case of the neutral atmosphere (below the ionosphere) information on the atmosphere's temperature, pressure and water vapor content can be derived by giving radio occultation data applications in meteorology.[1]

GNSS radio occultation

GNSS radio occultation (GNSS-RO), historically also known as GPS radio occultation (GPS-RO or GPSRO), is a type of radio occultation that relies on radio transmissions from GPS (

refracted along the way. The magnitude of the refraction depends on the temperature and water vapor concentration in the atmosphere.[4]

GNSS radio occultation amounts to an almost instantaneous depiction of the atmospheric state. The relative position between the

low-Earth-orbit satellite changes over time, allowing for a vertical scanning of successive layers of the atmosphere.[5]

GPSRO observations can also be conducted from aircraft[6] or on high mountaintops.[7]

Illustration of radio occultation

Planetary satellite missions

Current missions include REX on New Horizons.[8]

Satellite missions

See also

References

  1. ^
    S2CID 251652497
    .
  2. ^ Melbourne et al. 1994. The application of spacebourne GPS to atmospheric limb sounding and global change monitoring. Publication 94-18, Jet Propulsion Laboratory
  3. ^ Kursinski et al. 1997. Observing the Earth's atmosphere with radio occultation measurements using the Global Positioning System. J. Geophys. Res. 102:23.429-23.465.
  4. ^ "GPS 'thermometer' could flag up climate change". Retrieved 2008-02-16.
  5. ^ "GPS Space-Based & GPS Radio occultation". Archived from the original on 2009-05-15. Retrieved 2008-02-16.
  6. S2CID 23345728
    .
  7. doi:10.1029/1999JD900766
    .
  8. ^ "Payload Technical Specifications". Pluto.jhuapl.edu. Retrieved 2023-01-27.

9. Alexander, P., A. de la Torre, and P. Llamedo (2008), Interpretation of gravity wave signatures in GPS radio occultations, J. Geophys. Res., 113, D16117, doi:10.1029/2007JD009390.

External links

Retrieved from "https://en.wikipedia.org/w/index.php?title=Radio_occultation&oldid=1220538372"