D. Ratnam

M. Kumar, D. Ratnam, Sampad Kumar Panda, 2018, 2018 International Conference on Recent Innovations in Electrical, Electronics & Communication Engineering (ICRIEECE).

Characterization of ionospheric variability in TEC using EOF and wavelets over low-latitude GNSS stations

J R K Kumar Dabbakuti, D. Ratnam, 2016 .

Performance analysis of Neural Networks with IRI-2016 and IRI-2012 models over Indian low-latitude GPS stations

S. Raman, G. Sivavaraprasad, D. Ratnam, 2020, Astrophysics and Space Science.

Performance evaluation of linear time-series ionospheric Total Electron Content model over low latitude Indian GPS stations

J R K Kumar Dabbakuti, D. Ratnam, 2017 .

Mitigation of Multipath Effects Based on a Robust Fractional Order Bidirectional Least Mean Square (FOBLMS) Beamforming Algorithm for GPS Receivers

A. L. Siridhara, D. Ratnam, 2020, Wireless Personal Communications.

Multipath mitigation in GPS receiver using Taylor integrated bidirectional least mean square algorithm

A. L. Siridhara, D. V. Ratnam, D. Ratnam, 2019, Trans. Emerg. Telecommun. Technol..

Ionospheric Gradients Estimation and Analysis of S-Band Navigation Signals for NAVIC System

D. Venkata Ratnam, P. Babu Sree Harsha, T. Raghavendra Vishnu, 2018, IEEE Access.

Short-term forecasting of ionospheric total electron content over a low-latitude global navigation satellite system station

G. Sivavaraprasad, D. Ratnam, D. Ratnam, 2017 .

Generation of Regional Ionospheric TEC Maps With EIA Nowcasting/Forecasting Capability During Geomagnetic Storm Conditions

D. Venkata Ratnam, P. Babu Sree Harsha, D. Ratnam, 2020, IEEE Access.

Regional ionospheric model response of geomagnetic storm during March 2015 using data fusion mechanism: GPS, COSMIC RO and SWARM

D. Ratnam, Suneetha Emmela, 2022, Acta Geophysica.

Determination of NavIC differential code biases using GPS and NavIC observations

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

Improvement of Indian-Regional Klobuchar Ionospheric Model Parameters for Single-Frequency GNSS Users

D. Venkata Ratnam, J. R. K. Kumar Dabbakuti, N. V. V. N. J. Sri Lakshmi, 2018, IEEE Geoscience and Remote Sensing Letters.

Modeling of Ionospheric Time Delays Based on a Multishell Spherical Harmonics Function Approach

J. R. K. Kumar Dabbakuti, Surendra Sunda, Devanaboyina Venkata Ratnam, 2017, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

Modeling and analysis of GPS-TEC low latitude climatology during the 24th solar cycle using empirical orthogonal functions

D. Venkata Ratnam, J.R.K. Kumar Dabbakuti, J R K Kumar Dabbakuti, 2017 .

Modeling of Low-Latitude Ionosphere Using GPS Data With SHF Model

D. Venkata Ratnam, A. D. Sarma, D. Ratnam, 2012, IEEE Transactions on Geoscience and Remote Sensing.

Regional ionospheric TEC data assimilation and forecasting during geomagnetic storm conditions for 17th and 18th March 2015 days

D. K. Ojha, Babu Sree Harsha Pasumarthi, Devanaboyina Venkata Ratnam, 2020, 2020 IEEE International Conference on Wireless for Space and Extreme Environments (WiSEE).

Performance Analysis of Machine Learning Algorithms for Smartphone-Based Human Activity Recognition

D. Venkata Ratnam, N. C. Sri Harsha, Y. Girish Venkata Sai Anudeep, 2021, Wireless Personal Communications.

Machine learning based object-level crop classification of PlanetScope data at South India Basin

D. Ratnam, D. Bhavana, N. Likhita, 2023, Earth Science Informatics.

Performance evaluation of ionospheric time delay forecasting models using GPS observations at a low-latitude station

D. Venkata Ratnam, G. Sivavaraprasad, G. Sivavaraprasad, 2017 .

A Cross Layer Cluster Based Routing Approach for Efficient Multimedia Data Dissemination with Improved Reliability in VANETs

D. Venkata Ratnam, Shafi Shaik, D. Ratnam, 2019, Wirel. Pers. Commun..

Study of Sporadic E layer effect on the F layer during 23rd June 2015 geomagnetic storm event

D. Ratnam, M. Sridhar, T. V. Rao, 2022, 2022 URSI Regional Conference on Radio Science (USRI-RCRS).

Comparative analysis of ionosonde spread F and GPS ionospheric scintillations over Hyderabad

D. Ratnam, M. Sridhar, T. V. Rao, 2021 .

An Automatic CADI’s Ionogram Scaling Software Tool for Large Ionograms Data Analytics

T. V. Rao, D. Ratnam, M. Sridhar, 2022, IEEE Access.

Kriging‐based ionospheric TEC, ROTI and amplitude scintillation index ( S 4 ) maps for India

D. Venkata Ratnam, M. Sridhar, D. Ratnam, 2020, IET Radar, Sonar & Navigation.

Characteristics of ionospheric scintillation climatology over Indian low-latitude region during the 24th solar maximum period

D. Venkata Ratnam, Sarat K. Kotamraju, S. K. Kotamraju, 2019, Geodesy and Geodynamics.

Automatic ionospheric scintillation detector for global navigation satellite system receivers

Jiyun Lee, Devanaboyina Venkata Ratnam, G. Sivavaraprasad, 2015 .

Mitigation of ionospheric scintillations for GPS signals under geomagnetic storm conditions using LMS adaptive filter

Ch. Srinivasa Rao, D. Venkata Ratnam, M. Sridhar, 2016, Int. J. Inf. Commun. Technol..

Automatic Detection of GNSS Ionospheric Scintillation Based on Extreme Gradient Boosting Technique

Devanaboyina Venkata Ratnam, Nitin Sharma, Abhijit Dey, 2021, IEEE Geoscience and Remote Sensing Letters.

Machine learning algorithm to forecast ionospheric time delays using Global Navigation satellite system observations

D. Venkata Ratnam, G. Sivavaraprasad, Saravana Raman, 2020 .

A Bidirectional Long Short-Term Memory-Based Ionospheric foF2 and hmF2 Models for a Single Station in the Low Latitude Region

D. Venkata Ratnam, P. Babu Sree Harsha, I. Srivani, 2022, IEEE Geoscience and Remote Sensing Letters.

Implementation of Hybrid Ionospheric TEC Forecasting Algorithm Using PCA-NN Method

D. Venkata Ratnam, I. Lakshmi Mallika, Yuichi Ostuka, 2019, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

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.

Implementation of Hybrid Deep Learning Model (LSTM-CNN) for Ionospheric TEC Forecasting Using GPS Data

Kolla Bhanu Prakash, D. Venkata Ratnam, A. J. Sravan Kumar, 2021, IEEE Geoscience and Remote Sensing Letters.

A STUDY ON PERFORMANCE EVALUATION OF REED-SOLOMON (RS) CODES THROUGH AN AWGN CHANNEL MODEL IN A COMMUNICATION SYSTEM

D. Venkata Ratnam, R. Sneha, N. Suresh Reddy, 2012 .

Auto Regressive Ionospheric Prediction model for GPS Applications

D. Venkata Ratnam, K. Sarat Kumar, P Karthik., 2012 .

A trust based energy and mobility aware routing protocol to improve infotainment services in VANETs

Devanaboyina Venkata Ratnam, Shafi Shaik, D. Ratnam, 2022, Peer-to-Peer Netw. Appl..

A New Ionospheric Model for Single Frequency GNSS User Applications Using Klobuchar Model Driven by Auto Regressive Moving Average (SAKARMA) Method Over Indian Region

D. Venkata Ratnam, Gampala Sivavaraprasad, I. Lakshmi Mallika, 2020, IEEE Access.

Bi-LSTM based deep learning method for 5G signal detection and channel estimation

K. N. Rao, D. Ratnam, 2021, AIMS Electronics and Electrical Engineering.

RSS based Wi-Fi positioning method using multi layer neural networks

Sreevardhan Cheerla, D. Venkata Ratnam, D. Ratnam, 2018, 2018 Conference on Signal Processing And Communication Engineering Systems (SPACES).

Enhancing the performance of AOA estimation in wireless communication using the MUSIC algorithm

D. Venkata Ratnam, S. Susrutha Babu, S. Suparshya Babu, 2015, 2015 International Conference on Signal Processing and Communication Engineering Systems.

An Efficient Cross Layer Routing Protocol for Safety Message Dissemination in VANETS with Reduced Routing Cost and Delay Using IEEE 802.11p

D. Venkata Ratnam, B. N. Bhandari, Shafi Shaik, 2018, Wirel. Pers. Commun..

A cross layer design for efficient multimedia message dissemination with an adaptive relay nodes selection in VANETs

D. Venkata Ratnam, B. N. Bhandari, Shaik Shafi, 2018, 2018 Conference on Signal Processing And Communication Engineering Systems (SPACES).

Performance Evaluation of Adjusted Spherical Harmonics Ionospheric Model Over Indian Region

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

Observed Climatology and Trend in Relative Humidity, CAPE, and CIN over India

J. Jiang, Rehana Shaik, G. Basha, 2022, Atmosphere.

Modelling of FPGA-Particle Swarm Optimized GNSS Receiver for Satellite Applications

D. Venkata Ratnam, Surendra Pal, Nuli Namassivaya, 2019, Wirel. Pers. Commun..

A STUDY ON PERFORMANCE EV ALUATION OF REED-SOLOMON (RS) CODES THROUGH AN AWGN CHANNEL MODEL IN A COMMUNICA TION SYSTEM

S. Gopi Krishna, D. Venkata Ratnam, S. SivaKumar, 2012 .

Detection of iono-seismic signatures of the nepal earthquake using COSMIC RO measurements

T. Vishnu, D. Ratnam, M. Sridhar, 2018, 2018 Conference on Signal Processing And Communication Engineering Systems (SPACES).

Modeling of Indian Ionosphere using MMSE Estimator for GAGAN Applications

D. Venkata Ratnam, A. D. Sarma, D. Ratnam, 2006 .

Ionospheric Spatial Gradient Detector Based on GLRT Using GNSS Observations

D. Venkata Ratnam, Swapna Raghunath, D. Ratnam, 2016, IEEE Geoscience and Remote Sensing Letters.

Responses of the Indian Equatorial Ionization Anomaly to two CME-induced geomagnetic storms during the peak phase of solar cycle 24

K. Krishna, D. Ratnam, O. Oyedokun, 2021 .

Detection of Low-Latitude Ionospheric Irregularities From GNSS Observations

D. Venkata Ratnam, Swapna Raghunath, D. Ratnam, 2015, IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing.

An Extreme Value Analysis of Long-Term GNSS Ionospheric Total Electron Content Data Observed at Japan Grid Point Location (34.95° N and 134.05° E)

Y. Otsuka, M. Nishioka, A. Shinbori, 2023, IEEE Geoscience and Remote Sensing Letters.

Estimation and analysis of user IPP delays using bilinear model for satellite-based augmented navigation systems

D. Venkata Ratnam, D. Ratnam, Venkata Ratnam, 2013 .