WMO OSCAR | Details for Instrument AOPOD

No JavaScript detected
Usage of this Website will be severly limited without JavaScript. Please enable JavaScript in your Browser.

Instrument: AOPOD

Instrument details

Acronym	AOPOD
Full name	Atmosphere Occultation and Precision Orbit Determination
Purpose	Temperature/humidity sounding with highest vertical resolution; also ionospheric electrons
Short description	Measuring the phase delay due to refraction during occultation between GPS and LEO
Background	Consolidated technology
Scanning Technique	Limb scanning from the satellite altitude to close-to-surface by time sampling - Azimuth: 90° sectors fore- and aft-
Resolution	About 300 km horizontal, 0.5 km vertical
Coverage / Cycle	One GNSS constellations tracked. About 500 soundings/day - Average spacing 1000 km - Global coverage (300 km spacing) in 11 days
Mass	5 kg	Power	22 W	Data Rate

Providing Agency	KARI
Instrument Maturity	Backed by strong heritage
Utilization Period:	2013 to 2025
Last update:	2021-10-02

Detailed characteristics

Satellites this instrument is flying on

Note: a red tag indicates satellites no longer operational, a green tag indicates operational satellites, a blue tag indicates future satellites

Korea Multi-Purpose Satellite (KARI)
- KOMPSAT-5 (see instrument status) Nov 2013 - 2025

Instrument classification

Earth observation instrument
Active and radio-occultation sensor
GNSS radio-occultation

WIGOS Subcomponents

Subcomponent 1
GNSS radio occultation (basic constellation)
GNSS radio occultation sounder (basic constellation)
Subcomponent 2
Magnetospheric energetic particles and magnetometers
Ionospheric total electron content sensor [at LEO and cross magnetosphere]
Ionospheric electron density sensor [in LEO and cross magnetosphere]

Mission objectives

Primary mission objectives

Atmospheric temperature
Height of the top of PBL
Height of the tropopause
Specific humidity
Temperature of the tropopause

Evaluation of Measurements

The following list indicates which measurements can typically be retrieved from this category of instrument. To see a full Gap Analysis by Variable, click on the respective variable.

Note: table can be sorted by clicking on the column headers
Note: * Primary mission objective.

Search:

Variable	Relevance for measuring this variable	Operational limitations	Explanation
Atmospheric density	1 - primary	No specific limitation.	Measuring atmospheric density
Electron Density	1 - primary	No specific limitation.	Two directional antennas, two GNSS system tracked, about 1000 soundings/day
Atmospheric temperature*	2 - very high	Inaccurate in low troposphere.	Two directional antennas, two GNSS system tracked, covering about 1000 soundings/day
Height of the top of PBL*	2 - very high	No specific limitation.	Two directional antennas, two GNSS system tracked, about 1000 soundings/day. PBL top measured as discontinuity of the refraction index
Height of the tropopause*	2 - very high	No specific limitation.	Two directional antennas, two GNSS system tracked, about 1000 soundings/day. Tropopause height measured as discontinuity of the refraction index
Temperature of the tropopause*	2 - very high	No specific limitation.	Two directional antennas, two GNSS system tracked, about 1000 soundings/day
Specific humidity*	3 - high	Inaccurate in high troposphere.	Two directional antennas, two GNSS system tracked, about 1000 soundings/day
Ionospheric Total Electron Content (TEC)	3 - high	No specific limitation.	Two directional antennas, two GNSS system tracked, about 1000 soundings/day
Geoid	4 - fair	Highly indirect.	Radio-occultation processing implies precise orbitography. Geoid derived from multi-temporal analysis
Ionospheric Scintillation	4 - fair	No specific limitation.	Two directional antennas, two GNSS system tracked, about 1000 soundings/day
Gravity field	5 - marginal	Highly indirect.	Radio-occultation processing implies precise orbitography. Gravity field derived from multi-temporal analysis

Showing 1 to 11 of 11 entries