Satellite Receiver Geometry analysis using GPS & NavIC Combined Constellation

Currently, satellite navigation systems have played a vital role in geospatial autonomous positioning, supporting various applications, such as object tracking and missile launching. Global Navigation Satellite Systems (GNSS), including US-based GPS, Russia's GLONASS, Europe's Galileo, and Chinese BeiDou (BDS), offer worldwide coverage. Utilizing satellites from these systems enhances positioning accuracy, improves system reliability, and ensures stable performance even in challenging conditions. The accuracy of the system can depend on various factors like satellite geometry, atmospheric conditions, and the number of satellites available. Satellite geometry refers to the spatial arrangement of the satellites as viewed by a GPS receiver, which is a key factor in achieving the highest level of position accuracy. Dilution of Precision (DOP) is mostly the geometry between the satellite and the receiver and is a unitless factor that magnifies errors due to satellite geometry. DOP is also known as GDOP (Geometric Dilution of Precision). This study analyzes the influence of a multi-GNSS constellation, especially the combination of GPS and NavIC, on satellite geometry over a precise period, considering all forms of GDOP. The results show better performance of accuracy with the integration of GPS + NavIC.