Broadcast ionospheric delay correction algorithm using reduced order adjusted spherical harmonics function for single frequency GNSS receivers

• Autorzy: Abhigna M. S. R. , Sridhar M. , Harsha P. Babu Sree , Krishna K. Siva , Ratnam D. Venkata

Identyfikatory

DOI

10.1007/s11600-020-00515-z

• Języki publikacji: EN

Abstrakty

EN

Single-frequency Global Navigation Satellite System (GNSS) users require an efcient ionospheric delay correction model for improving their positional accuracy. GPS satellite range signals undergo time delay through the inhomogeneous and dynamic state of the ionosphere. The ionospheric delay is inverse proportional to the signal frequency square due to the dispersive nature of the ionospheric medium. There is a need for aid regional ionospheric broadcast correction model that is necessary for low-latitude ionospheric conditions. In this paper, a reduced order adjusted spherical harmonics function (ROASHF) ionospheric broadcast correction model with order and degree 2 is proposed for the Indian region. A dense GPS receiver network of 14 GPS receivers over the Indian region is analyzed to derive nine ROASHF broadcast coefcients. The performance of the proposed ionospheric broadcast correction model is compared with Klobuchar, NeQuickG, BDS-2, CODEKlob, and CODEGIM TEC models during March and September equinox and June and December solstice days in 2015 and 2016. The mean root mean square error (RMSE) of ROASHF, Klobuchar, NeQuickG, BDS-2, CODEKlob, and CODEGIM TEC models is 7.13 TECU, 9.52 TECU, 15.52 TECU, 11.44 TECU, 13.47 TECU, and 11.97 TECU, respectively. The results demonstrated that the proposed ROASHF ionospheric broadcast model could better predict the ionospheric delays for single-frequency GNSS users. The proposed ionospheric broadcast model is suitable for the Indian regional navigation system known as Navigation with Indian Constellation (NavIC).

Słowa kluczowe

EN

NavIC; ionosphere; Global Navigation Satellite System; GNSS; spherical harmonic function; Navigation with Indian Constellation

PL

NavIC; jonosfera; globalny system nawigacji satelitarnej; GNSS

• Wydawca: Instytut Geofizyki PAN ; Springer
• Czasopismo: Acta Geophysica
• Rocznik: 2021
• Tom: Vol. 69, no. 1
• Strony: 335--351
• Opis fizyczny: Bibliogr. 29 poz.

Twórcy

autor

Abhigna M. S. R.

• KoneruLakshmaiah Education Foundation, Greenfelds, Vaddeswaram, Guntur, Andhra Pradesh 522502, India

autor

Sridhar M.

• KoneruLakshmaiah Education Foundation, Greenfelds, Vaddeswaram, Guntur, Andhra Pradesh 522502, India

• https://orcid.org/0000-0002-3633-848X

autor

Harsha P. Babu Sree

• KoneruLakshmaiah Education Foundation, Greenfelds, Vaddeswaram, Guntur, Andhra Pradesh 522502, India

autor

Krishna K. Siva

• KoneruLakshmaiah Education Foundation, Greenfelds, Vaddeswaram, Guntur, Andhra Pradesh 522502, India

autor

Ratnam D. Venkata

• KoneruLakshmaiah Education Foundation, Greenfelds, Vaddeswaram, Guntur, Andhra Pradesh 522502, India

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