Real-time Detection of Anomalies in NavIC On-board Clock Using Carrier Phase Measurement
EDN: LGVRZR
Abstract
The accuracy of user position primarily depends on the behaviour of on-board clock. Any anomaly in clock behaviour would lead to inaccuracy in user position. Hence, the behaviour of on-board clock needs to be monitored continuously to ensure reliability in user position. This paper describes a methodology employed in NavIC constellation for anomaly detection using one way carrier phase measurement data. This methodology employs fractional frequency of on-board clock and addresses the presence of any integer ambiguity in the carrier phase measurement. Further, this methodology involves a novel algorithm that detects clock anomalies such as outliers, phase as well as frequency jumps. Following the detection of anomaly, the methodology would instantly initiate the process of estimating and updating the clock correction parameters which would subsequently broadcasted to the user.
About the Authors
Kaitha Rajaiah
U.R. Rao Satellite Centre, Indian Space Research Organisation
India
India
Bengaluru-560017
K. Manamohan
U.R. Rao Satellite Centre, Indian Space Research Organisation
India
India
Bengaluru-560017
S. Nirmala
U.R. Rao Satellite Centre, Indian Space Research Organisation
India
India
Bengaluru-560017
N. Hemanth Kumar Reddy
U.R. Rao Satellite Centre, Indian Space Research Organisation
India
India
Bengaluru-560017
Upadhya C. Prashanth
WIN-CoE, Indian Institute of Science
India
India
Bengaluru-560012
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Review
For citations:
Rajaiah K., Manamohan K., Nirmala S., Hemanth Kumar Reddy N., Prashanth U.C. Real-time Detection of Anomalies in NavIC On-board Clock Using Carrier Phase Measurement. Giroskopiya i Navigatsiya. 2026;34(1):58-70. (In Russ.) EDN: LGVRZR
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