Feasibility study of third frequency and improvements for NavIC satellites

Abstract

NavIC (Navigation with Indian Constellation) satellites transmit two signal frequencies L5 and S. L1C frequency has been introduced as a third frequency in NavIC for the civilian users like other navigation systems (e.g. GNSS (Global Navigation Satellite System), BeiDou Navigation satellite system) because of compatibility and interoperability for marketing. Also, the triple frequency improves the estimation of ionosphere delay and cycle slip detection. Therefore, a methodology needs to evolve to determine the ionosphere delay-free combinations using an exact and least square method for the triple frequency of NavIC Satellites. These methods have been derived based on the ionosphere amplification factor and noise reduction factor for both code and phase measurements. Also, a wide lane criterion is determined to detect the cycle slip for triple frequency. Results and analysis are demonstrated using the methods described for the exact solution and least square method. Also, further analysis is done to find the optimum solutions. Subject Classification: 65F20, 68U35, 78A99.