gyroscopyГироскопия и навигацияGiroskopiya i Navigatsiya0869-70352075-0927AO «Концерн «ЦНИИ «Электроприбор»LGVRZRgyroscopy-646Research ArticleСтатьиОбнаружение аномалий в работе бортовых часов спутников NavIC в реальном времени с помощью измерений фазы несущейReal-time Detection of Anomalies in NavIC On-board Clock Using Carrier Phase Measurementhttps://orcid.org/0000-0003-1648-9587РаджаяКайтхаRajaiahKaitha

Раджая Кайтха. Научный сотрудник

Бангалор

Bengaluru-560017

МанамоханК.ManamohanK.

Манамохан К. Научный сотрудник

Бангалор

Bengaluru-560017

НирмалаС.NirmalaS.

Нирмала С. Научный сотрудник

Бангалор

Bengaluru-560017

Хемантх Кумар РеддиН.Hemanth Kumar ReddyN.

Бангалор

Bengaluru-560017

https://orcid.org/0000-0001-7688-8825ПрашантхУпадхья Ч.PrashanthUpadhya C.

Прашантх Ч. Упадхья. Доктор наук

Бангалор

Bengaluru-560012

Спутниковый центр им. Рао, Индийская организация космических исследованийИндияU.R. Rao Satellite Centre, Indian Space Research OrganisationIndiaИндийский научный институтИндияWIN-CoE, Indian Institute of ScienceIndia2026270420263415870Copyright © Раджая К., Манамохан К., Нирмала С., Хемантх Кумар Редди Н., Прашантх У.Ч., 20262026Раджая К., Манамохан К., Нирмала С., Хемантх Кумар Редди Н., Прашантх У.Ч.Rajaiah K., Manamohan K., Nirmala S., Hemanth Kumar Reddy N., Prashanth U.C.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gyroscopy.ru/jour/article/view/646

Точность определения местоположения пользователя по данным спутниковых навигационных часов зависит главным образом от точности бортовых часов. Любое отклонение от нормы в их работе приводит к погрешности вычисления координат, поэтому функционирование бортовых часов требует непрерывного контроля. В статье представлен метод обнаружения аномалий работы бортовых часов по измерениям фазы несущей, который применяется в спутниковой группировке NavIC. При этом оценивается скорость ухода бортовых часов и учитывается наличие целочисленной неоднозначности измерений фазы несущей. Предлагаемая методика построена на новом алгоритме обнаружения аномалий в работе часов, таких как выбросы, скачки фазы и частоты. При их выявлении запускается процесс оценки и обновления параметров коррекции часов, которые затем транслируются пользователю.

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.

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The authors declare that there are no conflicts of interest present.