WMO OSCAR | Details for Instrument IGOR (TacSat-2)

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Instrument: IGOR (TacSat-2)

Instrument details

Acronym	IGOR (TacSat-2)
Full name	Integrated GPS Occultation Receiver
Purpose	Temperature/humidity sounding with highest vertical resolution, space weather
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	1 GNSS constellation tracked. About 500 soundings/day - Average spacing 1000 km - Global coverage (300 km spacing) in 10 days
Mass	4.6 kg	Power	16 W	Data Rate	17 kbps

Providing Agency	NASA
Instrument Maturity	Flown on operational programme
Utilization Period:	2007 to 2007
Last update:	2019-01-01

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

Tactical Satellite (DoD)
- TacSat-2 (see instrument status) Mar 2007 - Dec 2007

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)

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, one GNSS system tracked, about 500 soundings/day
Atmospheric temperature*	3 - high	Inaccurate in low troposphere.	Two directional antennas, one GNSS system tracked, covering about 500 soundings/day
Height of the top of PBL*	3 - high	No specific limitation.	Two directional antennas, one GNSS system tracked, about 500 soundings/day. PBL top measured as discontinuity of the refraction index
Height of the tropopause*	3 - high	No specific limitation.	Two directional antennas, one GNSS system tracked, about 500 soundings/day. Tropopause height measured as discontinuity of the refraction index
Specific humidity*	3 - high	Inaccurate in high troposphere.	Two directional antennas, one GNSS system tracked, about 500 soundings/day
Temperature of the tropopause*	3 - high	No specific limitation.	Two directional antennas, one GNSS system tracked, about 500 soundings/day
Ionospheric Total Electron Content (TEC)	3 - high	No specific limitation.	Two directional antennas, one GNSS system tracked, about 500 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, one GNSS system tracked, about 500 soundings/day
Gravity field	5 - marginal	Highly indirect.	Radio-occultation processing implies precise orbitography. Gravity field derived from multi-temporal analysis

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