IRNSS BASED ESTIMATION AND MITIGATION OF MULTIPATH ERROR FOR STRATEGIC TERRESTRIAL APPLICATIONS

Indian Regional Navigation Satellite System (IRNSS) is the emerging satellite based navigation system developed by Indian Space Research Organization (ISRO). The performance of IRNSS is limited by several errors including multi path, ionospheric error, tropospheric error etc. Multi path error becomes serious degradation factor on limiting the performance of IRNSS especially in urban environment. Estimation and mitigation of this induced multipath error improves the positional accuracy of IRNSS. In this paper, multipath error is estimated and analyzed on the data acquired from dual frequency IRNSS receiver in static urban environment. In this investigation, Code Minus Carrier (CMC) technique is implemented for estimating the multipath error. To mitigate the estimated error, LMS filter an adaptive filtering technique is considered. The results have proven that the multipath error is reduced by 99.99% on L5 and 99.99% on S1 frequencies.