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Abstract

DORIS (Doppler Orbitography Radio positioning Integrated by Satellite) is a space-based piggy back satellite system that when used as a terrestrial measurement system can provide an accuracy of10 cm in the absolute position measurement and in the order of sub-cm accuracy in relative measurements. When it rides piggyback on any satellite system can provide an orbital accuracy up to cm level. Precise Orbit Determination (POD) is the process of accurately tracking the position and velocity of a satellite in orbit. GNSS data observations alone have been used so far in India to study the plate tectonics movements and earthquake predictions in the Indian subcontinent. Since DORIS and GNSS both have homogeneous network distributions, the DORIS data observations can be combined with GNSS data observations to study plate tectonics movements and earthquake predictions more effectively. In DORIS the signal is transmitted from the ground, processing DORIS measurement residue helps us to better understand and model what occurs in between the layers of the atmosphere. This space-based geodetic measurement technique has been used for the past three decades the world over, for precise measurement on the ground as well as on all oceanographic and altimetric satellite missions, it has not been introduced in India so far. The National Centre for Geodesy was set up by the Department of Science and Technology at the IIT Kanpur has also plans to set up a Geodesy village, where the DORIS station is going to be established and DORIS data will be used in defining ITRF.