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The Sounder measures radiance in eighteen IR and one visible channel simultaneously over an area of area of 10 km x 40 km at nadir every 100 ms.

The translated downlink frequency is at 4506.5 MHz with a bandwidth of 200 kHz. These vertical profiles can then be used to derive various atmospheric stability indices and other parameters such as atmospheric water vapor content and total column ozone amount (Ref.
The blackbody view sequence is similar to that for the Imager.

The detector element of MIR channel is an InSb (Indium Antimonide) photodiode.

As mentioned earlier, the sounding is periodically interrupted for space and blackbody views. The bipropellant propulsion system uses fuel (MMH) and oxidizer (N Deviations in this optical registration due to residual physical misalignments left after assembling the payload and to the size and separation tolerances of the detector elements can be corrected on the ground by the processing software. The electronics packages that provide circuitry for the signal processing functions, scan mirror control, power supply and other auxiliary functions, are mounted on an internal panel of the spacecraft. For example, 1 block in E-W and 1 block in N-S direction will scan 640 km x 640 km on the ground at the subsatellite location.

• The first task is to perform orbit raising maneuvers on INSAT-3D , using the satellite's own propulsion system to place it into GEO at 35,786 km. Using a two-axes gimballed scan mirror, this footprint can be positioned anywhere in the FOR. Eventually, this staircase signal covers the full dynamic range of the video processors. A three stage, passive radiant cooler with close-loop heater control maintains the cooled IR detectors at the nominal temperature of 95 K. The radiating surfaces of the cooler are thermally isolated from the rest of the instrument and are adequately shielded from the radiation from Earth. The Sounder instrument has a total mass of ~145 kg. The main characteristics of the instrument are presented in Tables The INSAT-3D is a momentum-biased 3-axis stabilized spacecraft using star trackers for precise pointing control. The DRT receives globally metrological, hydrological and oceanographic data from automatic DCPs (Data Collection Platforms) in the ground segment and relays back to downlink in extended C -band. The filter lengths and inter filter gaps are optimized to get the best possible performance of all channels with this size of the wheel. That is, after the completion of the scan in the East-West direction, the mirror moves south by 1120 µrad and starts scanning in the reverse direction. The communication payload components are - Meteorological Transmitter, Data Relay Transponder, Satellite Aided Search and Rescue (SAS&R) Transponder & S-band Broadcast Satellite Services Transponder. The positional repeatability (E-W/N-S) of better than 5arcsec is ensured in all operations. This enables the derivation of vertical profiles of temperature and humidity. The SWIR channel of the INSAT-3D Imager is expected to support new applications while the Sounder will provide vertical temperature and moisture profile for the first time on a 24 hour basis over the region (Ref. The detector package is operated at a controlled temperature of 15°C. Ver 3.0; Last reviewed and updated on 01 Aug, 2020 & Served By: web-pri-srv Meteorological & Oceanographic Satellite Data Archival Centre Bidirectional scanning in the fast-scan direction is employed as in the Imager. The drive pattern for the blackbody calibration and space look consists of slewing the mirror at a rate of 10º/s to the set coordinates and bringing it back to the same position after the operation is completed. The ROIC employs capacitive trans-impedance amplifiers followed by an 8:1 multiplexer and output buffer.
The mission goals call for a significant technological improvement in sensor capabilities as compared to earlier INSAT missions. At the end of each fast scan line, the mirror steps south by a distance equivalent to 8 km distance on the ground.
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