GPS/NavIC Based Relative Position Estimation and Analysis using Real Time Measurements of Zero-Baseline Experiment

Abstract

This paper focuses on estimation and evaluating relative positioning accuracy using carrier phase measurements of GPS-alone, NavIC-alone, and GPS/NavIC. To make this happen, a zero-baseline method is used with single constellation as well as the combined processing of GPS and NavIC. Double difference method considerably reduces tropospheric and ionospheric delays yet, multipath signals remain a major source of error for different generic Global Navigation Satellite System (GNSS) baseline applications. In zero base-line method, a splitter is used to link two GPS/NavIC receivers to a single antenna. With the help of this technique, all errors or delays are eliminated, leaving alone the haphazard measurement noises resulting from the double difference processing.  Baseline error time series show that the GPS and NavIC can both reach centimeter precision, further GPS outperforms NavIC. Comparing the combined GPS and NavIC processing results to the GPS-alone and NavIC-alone results, it is clear that integrating the two can greatly increase precision.