BackForwardInstrument:  VHRR (INSAT) 

Instrument details
Acronym VHRR (INSAT)
Full name Very High Resolution Radiometer
Purpose Multi-purpose imagery and wind derivation by tracking clouds and water vapour features
Short description 3 VIS/TIR channels [see detailed characteristics below]
Background Heritage of VHRR flown on ATS-6
Scanning Technique Mechanical, 3-axis stabilised satellite, E-W continuous, S-N stepping
Resolution 8.0 km for IR channels; 2 km for the VIS channel
Coverage / Cycle Full disk every 3 hours for INSAT-2E, 1 hour for INSAT-3A (with half-hourly triplets around 00 and 12 UT for winds), half-hour for Kalpana-1
Mass 60 kg Power 37 W Data Rate 530 kbps

 

Providing Agency ISRO
Instrument Maturity Flown on operational programme
Utilization Period: 1982 to 2017
Last update: 2021-10-18
Detailed characteristics
Central wavelength Spectral interval SNR or NEΔT @ specified input
0.65 µm 0.55 - 0.75 µm 6 @ 2.5 % albedo
6.40 µm 5.70 - 7.10 µm 0.5 K @ 300 K
11.5 µm 10.5 - 12.5 µm 0.25 K @ 300 K
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

Instrument classification
  • Earth observation instrument
  • Passive optical radiometer or spectrometer
  • Moderate resolution optical imager
WIGOS Subcomponents
  • Subcomponent 1
  • Multi-spectral VIS/IR imagery With rapid repeat cycles [in GEO]
  • Multi-spectral VIS/IR imager with rapid repeat cycles [in GEO]
Mission objectives
Primary mission objectives
  • Cloud cover
  • Cloud top height
  • Cloud top temperature
  • Cloud type
  • Integrated Water Vapour (IWV)
  • Wind (horizontal)
Evaluation of Measurements