Detection and Analysis of Cycle Slips from GNSS Observations
T. Raghavendra Vishnu1, D. Venkata Ratnam2, P. Bhanu Priyanka3, M. Sridhar4, K. Padma Raju5

1T. Raghavendra Vishnu, Research Scholar, Department of ECE, KLEF Engineering, College University, Vaddeswaram Guntur (A.P), India.
2D. Venkata Ratnam, Professor, Department of ECE, KLEF Engineering, College University, Vaddeswaram Guntur (A.P), India.
3P. Bhanu Priyanka, Asst Professor, Department of ECE, Andhra Loyola Institute of Engineering and Technology, Vijayawada (A.P), India.
4M. Sridhar, Professor, Department of ECE, Andhra Loyola Institute of Engineering and Technology, Vijayawada (A.P), India.
5K. Padma Raju, Professor, Department of ECE, JNTUK Engineering, and Technological University, Kakinada (A.P), India.
Manuscript received on 05 February 2019 | Revised Manuscript received on 13 February 2019 | Manuscript published on 28 February 2019 | PP: 29-34 | Volume-8 Issue-4, February 2019 | Retrieval Number: D2612028419/19©BEIESP
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Abstract: Global Positioning System (GPS) receiver’s high precision and high reliability has gained importance in recent years as a result of continuous demand for GPS applications in various fields. In order to obtain accurate positioning information the GPS receivers use carrier phase measurements for high-precision applications. Carrier phase measurements are greatly affected by Cycle Slips (CS). In this paper, detection of the cycle slips analysis is carried out using the raw carrier phase data recorded for the solar maximum year 2013 at Koneru Lakshmaiah (K L) University, Guntur, India. Higher-order phase differencing scheme is used for the detection of the cycle slips. At higher-order differences, the amplification of sudden jumps associated with the cycle slips can be observed thereby improving the ability to detect cycle slips. It is found that cycle slips occurrence is high during the solar maximum year (2013). The connection of cycle slip occurrence with ionospheric scintillations is also investigated. During the geomagnetic storm event on 29 June, 2013, maximum S4 has been observed due to fall in C/N0 leading to occurrence of cycle slips. Empirical Mode Decomposition-Detrended Fluctuation Analysis (EMD-DFA) algorithm is used for mitigating the effects of ionospheric scintillations.
Keyword: Cycle slips, EMD-DFA, Scintillations.
Scope of the Article: Predictive Analysis