https://iaeme.com/Home/journal/IJEET 120 editor@iaeme.com International Journal of Electrical Engineering and Technology (IJEET) Volume 12, Issue 7, July 2021, pp. 120-128, Article ID: IJEET_12_07_013 Available online at https://iaeme.com/Home/issue/IJEET?Volume=12&Issue=7 ISSN Print: 0976-6545 and ISSN Online: 0976-6553 https://doi.org/10.34218/IJEET.12.7.2021.013 © IAEME Publication Scopus Indexed IRNSS BASED ESTIMATION AND MITIGATION OF MULTIPATH ERROR FOR STRATEGIC TERRESTRIAL APPLICATIONS Koiloth SRS Jyothsna 1 , Dr. K. Padma Raju 2 1 Department of Electronics and Communication Engineering, CBIT - Chaitanya Bharathi Institute of Technology, Hyderabad, Telangana, India 2 Department of Electronics and Communication Engineering, JNTUK - Jawaharlal Nehru Technological University, Kakinada, Andhra Pradesh, India ABSTRACT 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 multipath, ionospheric error, tropospheric error etc. Multipath 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. Key words: Navigation, IRNSS, Multipath Error, Positional accuracy. Cite this Article: Koiloth SRS Jyothsna and K. Padma Raju, IRNSS based Estimation and Mitigation of Multipath Error for Strategic Terrestrial Applications, International Journal of Electrical Engineering and Technology (IJEET), 12(7), 2021, pp. 120-128. https://iaeme.com/Home/issue/IJEET?Volume=12&Issue=7 1. INTRODUCTION IRNSS (Indian Regional Navigation Satellite System) is the emerging independent and indigenous satellite based regional navigation system developed by Indian Space Research Organization (ISRO). IRNSS with operational name Navigation with Indian Constellation (NavIC) consists of seven satellites. Out of which, 3 satellites are placed in Geostationary Orbit (GEO) at 32.5°, 83° and 131.5° E with small orbital inclination angle of about ±5˚ to mitigate the effect of Doppler collision. The remaining 4 are geosynchronous satellites (GSO) inclined