• Megha V Goudar
• Dr. K L Sudha

The IRNSS (Indian Regional Navigation Satellite System) has been conceived by Indian space research organization (ISRO) and is a constellation of 7 navigation satellites. Every GNSS (Global Navigational satellite system) receiver has a crystal oscillator which provides time that should be synchronized with the onboard satellite’s precise and stable atomic (Rubidium or Cesium) clocks. But in most of the cases, receiver clock is not exactly synchronized with satellite onboard clock, hence a variable clock offset is observed between receiver and satellite clocks, which in turn affect the position accuracy. This paper aims at studying different estimation algorithms to determine accurate clock and hence to determine receiver position accurately. MATLAB is used to develop Iterative least square (ILS), Extended Kalman Filter (EKF) estimation and Batch least square algorithms to estimate clock error and receiver position. Data from Accord’s NavIC receiver is considered for estimation process and respective results are compared with Accord’s receiver’s position values.

IRNSS, IGS receiver, Iterative least square(ILS), Extended kalman filter(EKF), Batch least square.

"ANALYSIS OF DIFFERENT ALGORITHMS FOR CLOCK ERROR ESTIMATION OF IRNSS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 5, page no.255-264, May-2019, Available :http://www.jetir.org/papers/JETIR1905Q34.pdf

"ANALYSIS OF DIFFERENT ALGORITHMS FOR CLOCK ERROR ESTIMATION OF IRNSS", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 5, page no. pp255-264, May-2019, Available at : http://www.jetir.org/papers/JETIR1905Q34.pdf