Weighted GDoP for improved position accuracy using NavIC and GPS hybrid constellation over Indian sub-continent

Abstract

Positioning accuracy of any navigation system plays a vital role in precise positioning applications like CAT-1 aircraft landings, surveying, etc. GNSS positioning accuracy can be affected by many factors like multipath, refraction in atmospheric layers, and satellite-receiver geometry. As Geometric Dilution of Precision (GDoP) is a dimensionless unit, which characterizes the geometry of satellite-receiver. For enhancing the position accuracy over low latitude Indian sub-continent, satellite-receiver geometry is investigated using weighted least squares-based Dilution of Precision (WGDoP) algorithm using GPS and NavIC combined constellation over Hyderabad region. The results are validated with IGS data of the receiver located at Navigation and Communication Research Centre (NCRC), Chaitanya Bharathi Institute of Technology (CBIT), Hyderabad.