المؤلفون: R. Mukesh, Sarat C. Dass, Negash Lemma Gurmu, M. Vijay, S. Kiruthiga, S. Mythili, D. Venkata Ratnam, V. B. S. Srilatha Indira Dutt

المصدر: Advances in Astronomy, Vol 2024 (2024)

مصطلحات موضوعية: Astronomy, QB1-991

وصف الملف: electronic resource

Relation: https://doaj.org/toc/1687-7977

URL الوصول: https://doaj.org/article/d543af5d5ce947bd8c26134612d1b99c

المؤلفون: T. Venkateswara Rao, M. Sridhar, D. Venkata Ratnam

المصدر: IEEE Access, Vol 10, Pp 22161-22168 (2022)

مصطلحات موضوعية: Ionosonde, CNN, VGG-16, auto-scaling, Electrical engineering. Electronics. Nuclear engineering, TK1-9971

وصف الملف: electronic resource

Relation: https://ieeexplore.ieee.org/document/9718318/; https://doaj.org/toc/2169-3536

URL الوصول: https://doaj.org/article/b1ce7f63fbde43deb54fe00e793b95ab

المؤلفون: K. Siva Krishna, D. Venkata Ratnam

المصدر: AIMS Electronics and Electrical Engineering, Vol 5, Iss 3, Pp 194-205 (2021)

مصطلحات موضوعية: global positioning system (gps), navigation with indian constellation (navic), differential code bias (dcb), inter-system biases (isb), Electrical engineering. Electronics. Nuclear engineering, TK1-9971

وصف الملف: electronic resource

Relation: https://doaj.org/toc/2578-1588

URL الوصول: https://doaj.org/article/d31d3edc27544baaa27c74881016f5c0

المؤلفون: K. Siva Krishna, D. Venkata Ratnam

المصدر: Geodesy and Geodynamics, Vol 11, Iss 2, Pp 97-105 (2020)

مصطلحات موضوعية: Geodesy, QB275-343, Geophysics. Cosmic physics, QC801-809

وصف الملف: electronic resource

Relation: http://www.sciencedirect.com/science/article/pii/S1674984719300837; https://doaj.org/toc/1674-9847

URL الوصول: https://doaj.org/article/52fb083dbc954b65bf36d0cc214d6b80

المؤلفون: P. Babu Sree Harsha, D. Venkata Ratnam

المصدر: IEEE Access, Vol 8, Pp 57879-57890 (2020)

مصطلحات موضوعية: Ionosphere, GAGAN, Gauss-Markov Kalman filter, EIA, TEC, data assimilation, Electrical engineering. Electronics. Nuclear engineering, TK1-9971

وصف الملف: electronic resource

Relation: https://ieeexplore.ieee.org/document/9044338/; https://doaj.org/toc/2169-3536

URL الوصول: https://doaj.org/article/8a4f92e65ce745189db92bcc35e049b1

المؤلفون: I. Lakshmi Mallika, D. Venkata Ratnam, Saravana Raman, Gampala Sivavaraprasad

المصدر: IEEE Access, Vol 8, Pp 54535-54553 (2020)

مصطلحات موضوعية: GNSS, NavIC, ionospheric delay, Klobuchar model, auto regressive moving average (ARMA) model, SAKARMA model, Electrical engineering. Electronics. Nuclear engineering, TK1-9971

وصف الملف: electronic resource

Relation: https://ieeexplore.ieee.org/document/9039612/; https://doaj.org/toc/2169-3536

URL الوصول: https://doaj.org/article/698753691d914182b769cdaef275f6e1

المؤلفون: Sahithi Karanam, D. Venkata Ratnam, J.R.K. Kumar Dabbakuti

المصدر: Geodesy and Geodynamics, Vol 10, Iss 3, Pp 235-240 (2019)

مصطلحات موضوعية: Geodesy, QB275-343, Geophysics. Cosmic physics, QC801-809

وصف الملف: electronic resource

Relation: http://www.sciencedirect.com/science/article/pii/S1674984718300442; https://doaj.org/toc/1674-9847

URL الوصول: https://doaj.org/article/105b144099e94b28a86d218dbe13221b

المؤلفون: D. Venkata Ratnam, T. Raghavendra Vishnu, P. Babu Sree Harsha

المصدر: IEEE Access, Vol 6, Pp 66954-66962 (2018)

مصطلحات موضوعية: Gradients, ionosphere, NAVIC, recursive least squares (RLS), TEC, Electrical engineering. Electronics. Nuclear engineering, TK1-9971

وصف الملف: electronic resource

Relation: https://ieeexplore.ieee.org/document/8528344/; https://doaj.org/toc/2169-3536

URL الوصول: https://doaj.org/article/f9cd39634214456dbaa9a0b19645e713

المؤلفون: D. Venkata Ratnam, G. Vindhya, J.R.K. Kumar Dabbakuti

المصدر: Geodesy and Geodynamics, Vol 8, Iss 5, Pp 305-310 (2017)

مصطلحات موضوعية: GPS, Gradient descent method, TEC, Geodesy, QB275-343, Geophysics. Cosmic physics, QC801-809

وصف الملف: electronic resource

Relation: http://www.sciencedirect.com/science/article/pii/S1674984717300101; https://doaj.org/toc/1674-9847

URL الوصول: https://doaj.org/article/159e8767f7594b14af5cae95eaa9c394

المؤلفون: J R K Kumar Dabbakuti, D. Venkata Ratnam, Surendra Sunda

المصدر: Aviation, Vol 20, Iss 1 (2016)

مصطلحات موضوعية: Global Position Systems (GPS), Total Electron content (TEC), Spherical Harmonic Analysis (SHA), Adjusted Spherical Harmonic Analysis (ASHA), Global Navigation Satellite Systems (GNSS), Motor vehicles. Aeronautics. Astronautics, TL1-4050

وصف الملف: electronic resource

Relation: http://journals.vgtu.lt/index.php/Aviation/article/view/693; https://doaj.org/toc/1648-7788; https://doaj.org/toc/1822-4180

URL الوصول: https://doaj.org/article/98affffc9e544979b80f8f9a1269de7e

المؤلفون: D. Venkata Ratnam

المصدر: Aviation, Vol 17, Iss 2 (2013)

مصطلحات موضوعية: GPS, ionospheric delay, total electron content, ionospheric pierce point, Motor vehicles. Aeronautics. Astronautics, TL1-4050

وصف الملف: electronic resource

Relation: http://journals.vgtu.lt/index.php/Aviation/article/view/3585; https://doaj.org/toc/1648-7788; https://doaj.org/toc/1822-4180

URL الوصول: https://doaj.org/article/c78390b48c294a5ba80d0877b60111f0

المؤلفون: K Siri Lakshatha, D Venkata Ratnam, K Sivakrishna

المصدر: AIMS Geosciences, Vol 8, Iss 1, Pp 127-136 (2022)

مصطلحات موضوعية: gnss, navic, equatorial ionization anomaly (eia), nequick g, iri 2016, Geology, QE1-996.5

Relation: https://doaj.org/toc/2471-2132; https://doaj.org/article/4bfbafcecc12427ba348f27b0c0883e3

الاتاحة: https://doi.org/10.3934/geosci.2022008
https://doaj.org/article/4bfbafcecc12427ba348f27b0c0883e3

المؤلفون: Ch Priyanka, D Venkata Ratnam, Sai Krishna Santosh G

المصدر: AIMS Electronics and Electrical Engineering, Vol 5, Iss 3, Pp 206-228 (2021)

مصطلحات موضوعية: gnss, gps, low noise amplifier (lna), noise figure (nf), Electrical engineering. Electronics. Nuclear engineering, TK1-9971

Relation: https://doaj.org/toc/2578-1588; https://doaj.org/article/a6fdafb0669144909ed230b285490696

الاتاحة: https://doi.org/10.3934/electreng.2021012
https://doaj.org/article/a6fdafb0669144909ed230b285490696

المؤلفون: D. Bhavana, N. Likhita, G. V. Madhumitha, D. Venkata Ratnam

المصدر: Earth Science Informatics. 16:91-104

مصطلحات موضوعية: General Earth and Planetary Sciences

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::70dd2036136e75343f55c315afb4b766
https://doi.org/10.1007/s12145-022-00922-4

المؤلفون: T. Venkateswara Rao, M. Sridhar, D. Venkata Ratnam

المصدر: Advances in Space Research. 70:1142-1152

مصطلحات موضوعية: Atmospheric Science, Geophysics, Space and Planetary Science, Aerospace Engineering, General Earth and Planetary Sciences, Astronomy and Astrophysics

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::30454eacaa53bccde88140b13f015e66
https://doi.org/10.1016/j.asr.2022.05.046

المؤلفون: Shaik Shafi, D. Venkata Ratnam

المصدر: Wireless Personal Communications. 126:3001-3019

مصطلحات موضوعية: Electrical and Electronic Engineering, Computer Science Applications

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::aab5fa6726e9cf4db0ce9f48713cef39
https://doi.org/10.1007/s11277-022-09849-x

المؤلفون: K. Sivakrishna, D. Venkata Ratnam, Gampala Sivavaraprasad

المصدر: GPS Solutions. 27

مصطلحات موضوعية: General Earth and Planetary Sciences

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::aab38925ef1c75678428732796f314f1
https://doi.org/10.1007/s10291-023-01426-4

المؤلفون: G. Sivavaraprasad, I. Lakshmi Mallika, K. Sivakrishna, D. Venkata Ratnam

المصدر: Advances in Space Research. 69:1366-1379

مصطلحات موضوعية: Atmospheric Science, Geophysics, Space and Planetary Science, Aerospace Engineering, General Earth and Planetary Sciences, Astronomy and Astrophysics

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::aafc2471aace557d1142cfb42cea442f
https://doi.org/10.1016/j.asr.2021.11.033

المؤلفون: T. Venkateswara Rao, I. Srivani, D. Venkata Ratnam, M. Sridhar, P. Babu Sree Harsha

المصدر: IEEE Geoscience and Remote Sensing Letters. 19:1-5

مصطلحات موضوعية: Geomagnetic storm, Critical frequency, Meteorology, Artificial neural network, Anomaly (natural sciences), Equatorial electrojet, Electrical and Electronic Engineering, Ionosphere, Geotechnical Engineering and Engineering Geology, Ionosonde, Geology, International Reference Ionosphere

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::fc6c9bd34a85b87cf7f9d40e6014a005
https://doi.org/10.1109/lgrs.2020.3045702

المؤلفون: T. Venkateswara Rao, M. Sridhar, D. Venkata Ratnam, B Suneel Kumar

المصدر: 2022 URSI Regional Conference on Radio Science (USRI-RCRS).

URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::9e21d177cacb1dbed3927a866acb5beb
https://doi.org/10.23919/ursi-rcrs56822.2022.10118540