K. Krishna

Determination of NavIC differential code biases using GPS and NavIC observations

D. Venkata Ratnam, K. Siva Krishna, D. Ratnam, 2020 .

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

D. Ratnam, M. Sridhar, P. B. S. Harsha, 2021, Acta Geophysica.

Performance Evaluation of Adjusted Spherical Harmonics Ionospheric Model Over Indian Region

P. Babu Sree Harsha, Kondaveeti Siva Krishna, Devanaboyina Venkata Ratnam, 2020, IEEE Access.