Investigation of GDOP for IRNSS

Abstract

The presence of Global Positioning System (GPS) of USA has helped the field of navigation greatly. India has developed and deployed Indian Regional Navigation Satellite System (IRNSS) for navigation within India. The precision of locating position using IRNSS is influenced by a few factors. One such factor is satellite Geometry with respect to the user. Better the geometry spread, better is the location exactness. The Satellite Geometry impact can be measured by Geometric Dilution of Precision (GDOP). Lower the GDOP, better is the accuracy of location. GNSS requires at least four satellites to figure client position. At the point when more number of satellites are in sight, best four satellites can be taken to compute one's position. For making utilization of IRNSS, investigation is made by figuring the best GDOP because of optimum constellation of four satellites in sight as well as for all the satellites in view. The System Tool Kit (STK) is utilized for examination of best GDOP selecting four satellites dynamically to get better client position accuracy over the Indian subcontinent. It is clear that, GDOP computed using all satellites in view is better than the GDOP computed by using best four satellites. Hence it is anticipated that all seven satellites can be used for IRNSS Navigation solution, though it requires little bit more processing time, than selecting four satellites visible from a particular point.