Nellore: After the spectacular success of GSLV-Mk III-D2/GSLV-29 Mission on November 14, Indian Space Research Organisation is preparing to launch HySIS (Hyperspectral Imaging Satellite), an earth observation satellite of India, along with 30 satellites of different international firms through Polar Satellite Launch Vehicle- PSLV-C43 tentatively at 9.57 am on November 29 from Satish Dhawan Space Centre, Shar, Sriharikota.
Isro officials said their endeavour is to enter the domain of operational hyperspectral imaging from earth orbit with a satellite that can see in 55 spectral or colour bands from 630 km above ground.
The HySIS is meant to provide hyperspectral imaging services to the country for a range of applications in agriculture, forestry and assessment of coastal zones, inland waters, soil and other geological environments, etc.
HySIS carries two payloads in visible and near infrared regions of the electromagnetic spectrum. This earth observing imaging spectrometer will operate in the 0.4 to 0.95µm spectral range, will have 55 spectral bands with 10 nanometre spectral sampling and 30 metre spatial sampling. Push-broom scanning mode is the operating mode of this sensor from a 630-km orbit.
Isro’s Satellite Applications Centre has designed a chip to meet the project requirements with respect to spatial and temporal resolution, dynamic range, modulation transfer function, smear and spectral responsivity.
According to Isro officials, 1000 X 66 pixels were designed to be readout, from both top and bottom directions, using four analog video ports to meet the frame rate requirement.
Metal strapping was used for swiftly transferring integrated charges from image to storage region, in order to reduce image smear. Designs (both at chip and package levels) went through detailed review, before clearing for mask making and package fabrication, by a team consisting of members from Isro’s SCL (Semiconductor Laboratory) and SAC (Satellite Application Centre).
Isro officials said HySIS is increasingly being used in the field of remote sensing from airborne and space-borne platforms for a variety of applications.
HySIS spacecrafts carries the Hyper Spectral Compact Imaging in VNIR (Visible and Near Infrared) and SWIR (Shortwave Infrared) spatial region in 60 and 256 contiguous spectral bands respectively, with 10 nm bandwidth providing 30m spatial resolution and covering a swath of 30 km at 630 km orbit.