Source: http://cbit.ac.in/?q=node/709
Timestamp: 2019-04-22 08:04:10+00:00

Document:
G. Venkateswarlu and A. D. Sarma “A New Technique Based On Grey Model For Forecasting Of Ionospheric GPS Signal Delay Using GAGAN Data” Progress in Electromagnetics Research M (PIERM), Vol. 59, page 33-43, 2017, ISSN: 1937-8726, doi:10.2528/PIERM17041403.
S. Reddy Ammana and A. D. Sarma, "Estimation of overbound on ionospheric spatial decorrelation over low-latitude region for ground-based augmentation systems," in IET Radar, Sonar & Navigation, vol. 10, no. 3, pp. 637-645, 3 2016.
V. S. Srinivas, A. D. Sarma, A. S. Reddy, and D. K. Reddy, "Investigation of the effect of ionospheric gradients on GPS signals in the context of LAAS, " Progress In Electromagnetics Research B (USA), Vol. 57, 191-205, 2014.
P.Naveen Kumar, A.D.Sarma and A.Supraja Reddy “Modelling of Ionospheric Time Delay of GPS signals using Taylor Series Expansion for GPS Aided Geo Augmented Navigation Applications”, IET Radar Sonar and Navigation (UK), DOI:10.1049/iet-rsn.2013.0351 , May 2014.
Kumar, Perumalla Naveen; Rasool, Nayab; Krishna, K Madhu; Sarma, A D; Mridula, N; Pant, Tarun Kumar; Sreelatha, P; Rosmi, J; Koli, Santosh; Kumar, Praveen; Sharma, R, “Ionospheric variability of low and equatorial latitude regions over India – A study using RaBIT on-board YOUTHSAT”, Indian Journal of Radio & Space Physics (IJRSP), IJRSP Vol.42(3) , June 2013, ISSN: 0367-8393.
Swamy, K C T; Sarma, A D; Reddy, A Supraja; Srinivas, V Satya; Rao, P V D Somasekhar, “Modelling of GPS signal scintillations with polynomial coefficients over the Indian region”, Indian Journal of Radio & Space Physics (IJRSP), IJRSP Vol.42(3) ,June 2013, ISSN: 0367-8393.
Yedukndalu K, Sarma A.D, Ashwani Kumar and Satyanarayana K, “Spectral Analysis and Mitigation of GPS Multipath Error using Digital Filtering for Static Applications”, IETE Journal of Research Volume : 59, Issue : 2, 2013, DOI: 10.4103/0377-2063.113036, ISSN: 0377-2063.
K.C.T. Swamy, A.D. Sarma, V. Satya Srinivas, P. Naveen Kumar and PVD. Somasekhar Rao, “Accuracy Evaluation of Estimated Ionospheric Delay of GPS Signals Based on Klobuchar and IRI-2007 Models in Low Latitude Region”, IEEE Geoscience and Remote Sensing Letters (USA), Volume:10, Issue:6, Nov. 2013, DOI: 10.1109/LGRS.2013.2262035, ISSN: 1545-598X.
V. Satya Srinivas, A.D. Sarma, K.C.T. Swamy, K. Satyanarayana. “Performance evaluation of IRI-2007 at equatorial latitudes and its Matlab version for GNSS applications”, Advances in Space Research, 2013 (USA), DOI: 10.1016/j.asr.2012.12.002, ISSN: 02731177.
Ashwani Kumar, A. D. Sarma, Ezharul Ansari, and Kamatham Yedukondalu, “Improved Phase Center Estimation for GNSS Patch Antenna”, IEEE Transaction on Antennas and Propagation. , VOL. 61, NO. 4, APRIL 2013, DOI: 10.1109/TAP.2012.2232896, ISSN: 0018-926X.
A. Kumar, S. D. Ahirwar, C. Sairam, A. D. Sarma, and G. Venkateswarlu, "Parasitic probe FED microstrip antenna for multi-constellation gnss," Progress In Electromagnetics Research Letters, Vol. 37, 1-10, 2013(USA), ISSN: 1937-6480.
Satyanaryana K, Sarma A.D, Sravan J, Malini M and Venkateswarlu G, “GPS and GPRS based Telemonitoring system for Emergency Patient Transportation”, Journal of Medical Engineering, Hindawi, Volume 2013, DOI: 10.1155/2013/363508.
A Supraja Reddy, G Santhosh Kumar, AD Sarma “Mitigation of Code-carrier Divergence Effect using an Optimized Filter for LAAS Applications” IETE Journal of Research, Volume 58 , Issue 6, pp 464-468, Nov-Dec 2012, DOI:10.4103/0377-2063.106752, ISSN: 0377-2063.
K. Yedukondalu, A.D. Sarma and V. Satya Srinivas, “Estimation and Mitigation of GPS Multipath Interference using Adaptive filtering”, Journal of Progress in Electromagnetics Research M (PIER M), Vol. 21, pp: 133-148, 2011( USA), ISSN: 1937-8726.
D.Venkata Ratnam, and A.D.Sarma, “Modelling of Low Latitude Ionosphere using GPS Data with SHF Model”, IEEE Transactions on Geoscience and Remote Sensing, September 2011 (USA), ISSN: 0196-2892.
Venkata Ratnam. D, A. D. Sarma, V. Satya Srinivas, and P.Sreelatha, “Performance evaluation of Selected Ionospheric Delay Models during Geomagnetic Storm Conditions in Low-latitude Region”, journals of Radio Science, 46, RS0D08, (UShiraj Sunehra, A.D. Sarma, D.R. Lakshmi, and B.M. Reddy, “Application of Least Squares Adjustment Technique for Estimation of TEC and Instrumental Biases for GAGAN Applications”, International Union of Radio Science, XXIXth General Assembly, Chicago, USA, August 7-16 ,2008.
A.D. Sarma, D. Krishna Reddy and M.V.S.N. Prasad, “Grid Based field strength for mobile vehicle positioning”, International Union of Radio Science, XXIX, General Assembly, Chicago, U.S.A, August 7-16, 2008.
D. Krishna Reddy, N. Sunanda, D. Venkata Ratnam and A.D.Sarma, “Mobile Positioning using RSS based Weighted Least Square Algorithm for LBS application”, 3rd International conference on Positioning, Timing and Navigation (LOCATION 07), New Delhi, India, February 8-9 ,2008.
K. Ravi Chandra and A.D. Sarma “Investigation of Ionospheric Mapping Function Error for GAGAN Application”, International conference on Positioning, Timing and Navigation (LOCATION 07), New Delhi, February 7 -8, 2008.
K. Satyanarayana, A. Ushasri and A.D.Sarma, “DSP based Noise Reduction Techniques for Biomedical Applications”, International conference on RF and Signal Processing Systems, KLCE, Guntur, February 1-2, 2008.
Dhiraj Sunehra, D.Venkata Ratnam, K. Ravi Chandra, V. Satya Srinivas, Md. Saleemulla and A.D.Sarma, “Hardware and Software Aspects of Dual Frequency GPS Receiver”, Silver Jubilee National Conference on Global Navigation Satellite System and its Applications (GNSS-2007), NERTU, Osmania University, Hyderabad, pp. 8-13, Oct. 25-26, 2007.
Dhiraj Sunehra, S.Swapna Rani, V.Satya Srinivas, K.Ravi Chandra and A.D.Sarma, “A Single-Site Technique for Real-Time Estimation of Ionospheric Delay”, Silver Jubilee National Conference on Global Navigation Satellite System and its Applications (GNSS-2007), NERTU, Osmania University, Hyderabad, pp. 68-71, Oct. 25-26, 2007.
K. Satyanarayana, A. Ushasri and A.D.Sarma, “Effect of location on Physiological Parameters”, Silver Jubilee National Conference on Global Navigation Satellite System and its Applications (GNSS-2007), NERTU, Osmania University, Hyderabad, pp. 68-71, Oct. 25-26, 2007.
V Satya Srinivas, K. Ravi Chandra and A.D Sarma “ An Improved Technique for Cycle slip Detection and Correction of GPS Signals”, National Conference on Intelligent System, Hyderabad, 24-25, August, 2007.
A.D.Sarma, D.Venkata Ratnam and P.V.D Soma sekhar rao “Modified Ionospheric Grid Model for GAGAN”, Beacon Satellite Symposium (BSS-2007), Boston ,USA, 11-15 June 2007.
Sudha Ravindran, G. Manju, C. V. Devasia, Smitha V. Thampi, Tarun K. Pant, V. Sreeja, P. Sreelatha, R. Sridharan, J.H. Sastri, A.D. Sarma, Rajnish Sharma, R.S. Dabas and Rupesh M. Das, “Plasmaspheric Electron Content Over The Indian Region Under Different Geophysical Conditions”, Beacon Satellite Symposium (Bss-2007), Boston, USA, 11-15 June 2007.
Sudha Ravindran, Smitha V. Thampi, C.V. Devasia, Tarun K. Pant, G. Manju, R. Sridharan, J.H. Sastri, A.D. Sarma, A.K. Gwal and R.S. Dabas, “Tomographic Imaging Of The Equatorial And Low-Latitude Ionosphere In The Indian Region : Results From The Coherent Radio Beacon Experiment (Crabex)”, Beacon Satellite Symposium (BSS-2007), Boston, USA, 11-15 June 2007.
Sudha Ravindran, G. Manju, C.V. Devasia, Smitha V. Thampi, R. Sridharan, J.H. Sastri, A.D. Sarma, Rajnish Sharma, R.S. Dabas and Rupesh M. Das, “Latitudinal Variation Of Vhf, Uhf And L-Band Scintillation And Their Relation To The Latitudinal Gradients In Tec In The Indian Zone Under Different Geophysical Conditions”, Beacon Satellite Symposium (BSS-2007), Boston ,USA, 11-15 June 2007.
D.Venkata Ratnam and A.D.Sarma, “A 3-D Ionospheric model for GAGAN”, 3rd International Conference on Computers and Devices for Communication (CODEC-06), Institute of Radio Physics and Electronics, University of Calcutta, pp.574-576, December 18-20, 2006.
Dhiraj Sunehra, D.Venkata Ratnam and A.D.Sarma, “Prominent methods for estimation of instrumental biases for GAGAN applications”, 3rd International Conference on Computers and Devices for Communication (CODEC-06), Institute of Radio Physics and Electronics, University of Calcutta, pp.641-644, December 18-20, 2006.
Quddusa Sultana, A.D.Sarma and PVD Somasekhar, “Enhancing the Performance of GAGAN using Pseudolites”, 3rd International Conference on Computers and Devices for Communication (CODEC-06) Institute of Radio Physics and Electronics, University of Calcutta, pp.612-615, December 18-20, 2006.
D.Krishna Reddy, A.D.Sarma and Y. Yedukondalu “Position Fixing of Mobile User Using RSS Statistics”, 3rd International Conference on Computers and Devices for Communication (CODEC-06) Institute of Radio Physics and Electronics, University of Calcutta, pp.637-640, December 18-20, 2006.
Y. Ravi Kumar, D.Krishna Reddy and A.D.Sarma “A Statistical Model for Predicting Optimum Fade Margin in Communication Links”, 3rd International Conference on Computers and Devices for Communication (CODEC-06) Institute of Radio Physics and Electronics, University of Calcutta, pp.589-592, December 18-20, 2006.
Ashwani Kumar, A.D.Sarma and N. Ajit, “A Compact GPS Patch Antenna for L5 Frequency”, 3rd International Conference on Computers and Devices for Communication (CODEC-06) Institute of Radio Physics and Electronics, University of Calcutta, pp.26-29, December 18-20, 2006.
K. Ravi Chandra and A.D.Sarma “Investigation of Ionospheric Gradients for GAGAN Applications”, Eleventh International Workshop on Technical and Scientific aspects of MST Radar, 11-15th December, 2006, Gadanki/Tirupathi, India.
D.Krishna Reddy, A.D.Sarma, D.Venkata Ratnam and K.Satyanarayana “Grid Based Field Strength Method for Mobile Positioning”, 2nd International conference on Positioning, Timing and Navigation (LOCATION 06), 7-9th June, 2006, Bangalore, India.
K. Ravi Chandra, D. Krishna Reddy, D.Venkata Ratnam and A.D.Sarma, “Integration of LRF Observables with GPS Datum for GIS Applications”, ICORG 2006, 5–8th June 2006, JNTU, Hyderabad.
Dhiraj Sunehra and A.D.Sarma, “Analysis of dual frequency GPS data for improving Position accuracy”, ICORG 2006, 5 – 8th June 2006, JNTU, Hyderabad.
Quddusa Sultana and A.D.Sarma, “Augmentation of GPS using Pseudo-satellites for Precise Vehicle Tracking”, ICORG 2006, 5–8th June 2006, JNTU, Hyderabad.
Dhiraj Sunehra and A.D.Sarma “Resolving Integer Ambiguities and Cycle Slips for TEC Estimation Using GPS Data”, XIV National Space Science Symposium-2006, Andhra University, Visakhapatnam, 9-12 February 2006.
D.Venkata Ratnam and A.D.Sarma, “Two Station Method for the Determination of Phase Offset of CRABEX Signals”, XIV National Space Science Symposium-2006, Andhra University, Visakhapatnam, 9-12 February 2006.
T. Madhu, A.D.Sarma and D.Venkata Ratnam, “Strom Time Variations of TEC Using GPS Data at Hyderabad Station”, XIV National Space Science Symposium-2006, Andhra University, Visakhapatnam, 9-12 February 2006.
D.Venkata Ratnam, A.D.Sarma and K.Yedukondalu, “Comparison of Ionospheric Time Delays due to GPS, CRABEX and IRI Model”, 42nd Annual Convention Meeting, IGU, Barkatullah University, Bhopal, 7-9 December 2005.
Quddusa Sultana and A.D.Sarma, “Effect of Stratolite Constellation Geometry on positional Accuracy”, 42nd Annual Convention Meeting, IGU, Barkatullah University, Bhopal, 7-9 December 2005.
A.D.Sarma, T.Madhu, D.R.Lakshmi and B.M.Reddy, “Ionospheric time delay variations over a low latitude station at Hyderabad”, International Union of Radio Science, XXVIIIth General Assembly, 23-29 October 2005, New Delhi.
A.D.Sarma, D.Venkata Ratnam and C.V.Devasia, “Validation of TEC derived from CRABEX receiver with GPS data”, International Union of Radio Science, XXVIIIth General Assembly, 23-29 October 2005, New Delhi.
Dhiraj Sunehra and A.D.Sarma, “Application of Kalman filter technique for estimation of Ionospheric TEC over low latitude regions using GPS data”, International Union of Radio Science, XXVIIIth General Assembly, 23-29 October 2005, New Delhi.
K.Ramalingam, G.Sasibhushana Rao and A.D.Sarma, “Estimation of Instrumental biases using Least Square method for accurate TEC modelling”, International Union of Radio Science, XXVIIIth General Assembly, 23-29 October 2005, New Delhi.
A.D.Sarma, Y.Ravi Kumar, D.Krishna Reddy, M.V.S.N. Prasad and C.V.Devasia, “Investigation of correlation and coherence characteristics of LEO satellite signals”, International Union of Radio Science, XXVIIIth General Assembly, 23-29 October 2005, New Delhi.
A.D.Sarma, S.Ghouse Mohideen and D.Krishna Reddy, “Modeling of Indian Ionosphere using planar fit method with adaptable decorrelation function for GAGAN”, International Union of Radio Science, XXVIIIth General Assembly, 23-29 October 2005, New Delhi.
A.D.Sarma, P.S.Ravikanth and D.Krishna Reddy, “Integration of GPS and GSM for determination of cellular coverage area”, International Union of Radio Science, XXVIIIth General Assembly, 23-29 October 2005, New Delhi.
J.V.Rama Mohan, N.S.Murthy Sarma, K.Rama Rao and A.D.Sarma, “Scintillation effects near 60GHz frequency band and its applications to cellular telephony”, National conference on recent advances in Electronics and Communication (RACE-05), 24th-25th June 2005, S.R.K.R. Engineering College, Bhimavaram.
N.S.N.Murthy Sarma, B.Rama Krishna Rao and A.D.Sarma, “3-D radiation pattern analysis of GPS airborne microstrip antenna using UTD”, Proc. of the Int. Conf. on Antenna Technologies (ICAT), 23-25 Feb. 2005,pp.315-318, SAC,, ISRO, Ahmedabad.
A.D.Sarma, Y. Ravi Kumar, and D.Krishna Reddy, “Analysis of Mobile Communication Data”, Proc. of Int. Conf. on Personal Wireless Communications (ICPWC-2005), January 23-25,pp. 225-229, New Delhi, India.
K. Ramalingam, G. Sasi Bhushana Rao and A.D.Sarma, “Estimation of instrumental biases using data from GAGAN TEC stations”, 41st Annual Convention Meeting, IGU, NGRI, 29-31 Dec., 2004, Hyderabad.
D.Venkata Ratnam, A.D.Sarma and Niranjan Prasad “Minimum mean square error estimation for GAGAN”, 41st Annual Convention Meeting, IGU, NGRI, 29 –31 Dec., 2004, Hyderabad.
Dhiraj Sunehra, A.Chandra Vardhan and A.D.Sarma, “A Kalman filter approach for estimation of instrumental biases and ionospheric total electron content for GPS applications”, Asia Pacific Microwave Conference (APMC-2004), 15 –18 Dec., 2004, New Delhi.
A.D.Sarma, Niranjan Prasad and T.Madhu, “Development of grid based ionospheric models for GAGAN”, International Beacon Satellite Symposium, The Abdus Salam International Center for Theoretical Physics, 18 –22 Oct., 2004, Trieste, Italy.
A.D.Sarma, Quddusa Sultana, Ashwani Kumar, D.Krishna Reddy, G.Sasi Bhushana Rao and B.Hari Kumar, “Pseudolite based navigation system for secured position fixing”, International Symposium on Microwaves–2004 (ISM-04), 1-3 Sept., 2004, Bangalore.
Niranjan Prasad, A.D.Sarma and Quddusa Sultana, “Ionospheric grid delay estimation using distance weighted model”, National conference on Microwaves and Opto Electronics (NCMO-2004), pp. 197-203, Dr. Baba Saheb Ambedkar Marathwada University, 29-30 June 2004, Aurangabad.
Quddusa Sultana, A.D.Sarma, K.Ramalingam, “GPS independent pseudolite based navigation system”, National Conference on Microwaves and Opto Electronics (NCMO-2004), PP.215-222, Dr. Baba Saheb Ambedkar Marathwada University, 29-30 June, 2004, Aurangabad.
A.D.Sarma, Dhiraj Sunehra and D.Venkata Ratnam, “Prominent datum conversions for GPS Applications”, International Conference on CODEC-04, 1-3 Jan., 2004, Kolkata.
T.Madhu, A.D.Sarma, R.Annapurna, N.V.Suresh Kumar and D.R.Lakshmi, “Estimation of Time Delay Profiles Using Modified IRI-90 for GPS Applications”, IGU 40th Annual convention and Meeting on Recent Advances & Future strategies in Geoscientific Exploration,pp.24-25, 16-18th Dec.2003, University of Madras, Chennai, India.
A.D.Sarma and N.S.Murthy Sarma, “Modeling of Drop Size Distribution Using Modified Gamma Distribution Function”, National Conference on Radio Science, National Physical Laboratory, New Delhi, pp.59, Nov.27-29,2003.
T.Madhu, B.Shiva Kumar and A.D.Sarma, “ Ionospheric Time delay Analysis Using Dual Frequency GPS Receiver”, National Conference on Radio Science,National Physical Laboratory, New Delhi, pp.87, Nov.27-29,2003.
Niranjan Prasad, A.D.Sarma, T.Madhu and B.Shiva Kumar, “Preliminary Studies on Ionospheric Correction due to Inverse Distance Weighted Grid Model for GAGAN”, National Conference on Radio Science, National Physical Laboratory, New Delhi, pp.97, Nov.27-29,2003.
Ashwani Kumar and A.D.Sarma, “Parasitically Excited wideband Microstrip Antenna for GPS Receiver”, Seminar on State of Art Technologies”, Golden Jubilee Celebrations of IETE, 30-31Aug., 2003, Visakhapatnam-500 003.
A.D.Sarma, Quddusa Sultana and K.Ramalingam, “Significance of Pseudolites in the context of LAAS”, Seminar on State of Art Technologies”, Golden Jubilee Celebrations of IETE, 30-31Aug. 2003, Visakhapatnam-500 003.
Y.Ravi Kumar, D.Krishna Reddy, and A.D.Sarma, “Analysis of Second order Statistical Parameters for Mobile Communication Channel”, Proc. Golden Jubilee Symposium on Convergence of Technologies, IETE , Hyderabad Centre,12th July,2003.
B.Rama Krishna Rao and A.D.Sarma, “ A novel technique to reduce multipath using GPS antennas”, National Symposium on Global Positioning System and its Applications, R & T Unit for Navigational Electronics, Osmania University, Hyderabad, 19th Dec.2002.
K.Ramalingam, B.Hari Kumar, A.D.Sarma, K.Rama Krishna and G.Sasi Bhushana Rao, “ Comparision of LAAS and WAAS in the context of Indian Conditions”, National Symposium on Global Positioning System and its Applications, R & T Unit for Navigational Electronics, Osmania University, Hyderabad, 19th Dec.2002.
K.Ravindra and A.D.Sarma, “Effect of beam width on adaptive path loss models for mobile communications”, National symposium on Antennas and Propagation, Cochin University of Science and Technology, Cochin, 9-11 Dec.2002.
B.Rama Krishna Rao, A.D.Sarma and Y.Ravi Kumar, “Mitigation of multipath using shaped beam spiral antenna”, National symposium on Antennas and Propagation, Cochin University of Science and Technology, Cochin, 9-11 Dec.2002.
G.Sasibhushana Rao, A.D.Sarma, K.Ramalingam and Niranjan Prasad, “Estimation of IGP availability for a given INWAAS configuration”, National symposium on Antennas and Propagation, Cochin University of Science and Technology, Cochin, 9-11 Dec.2002.
T.Madhu and A.D.Sarma, “Estimation of foF2 using back propagation algorithm for GPS applications”, National conference on Microwaves, Antenna, Propagation and Remote Sensing, Jodhpur, 19-21 Dec.2002.
T.Madhu, A.D. Sarma, Paramita Karanjai and S.N.N.Pandit, “Modeling of foF2 using Analysis of Variance”, 39th Annual convention and meeting on ‘Sustainability Science and Environmental Geophysics’, NEERI, Nagpur, 4-6 October, 2002.
A.D. Sarma, B.M. Reddy, T. Madhu, Niranjan Prasad, K. Ravindra and D.R. Lakshmi, “Ionospheric Constraints and Time delay Statistics for Indian WAAS”, 10th International Ionospheric Effects Symposium, IES-2002, Virginia, 7-9, May 2002.
A.D.Sarma, Niranjan Prasad, K.Ravindra, B.L.Malleswari and D.C.Reddy, “Preliminary study ionospheric delay statistics in the context of Indian WAAS”, XII National Space Science Symposium (NSSS-2002), Barkatullah University, Bhopal, Feb.25-28, 2002.
K. Ravindra and A.D. Sarma, “Channel Characterization Of Mobile Signal At 11 GHz”, INCEMIC – 2001/02, Feb., 2002, Bangalore.
B. Ramakrishna Rao, N.S. Murthy Sarma, A.D. Sarma and K.Ravindra, “Modelling Of Planar Spiral Antenna Mounted On A Rocket Shaped Structure Using Wedge Diffraction Analysis”, INCEMIC – 2001/02, Feb., 2002, Bangalore.
K. Ravindra, B.L. Malleswari and A.D. Sarma, “Development of Conversion Parameters for GPS Datum”, National Conference on GIS ACE – 2K2, Feb. 2002, Hyderabad.
K. Ravindra, A.D. Sarma and D. Krishna Reddy, “Mobile Communication Standards – A Mini Review”, Proc. National Conference on Sensors and Instrumentation, Paper no. 53, 5 – 6 January 2002, Hyderabad.
A.D.Sarma, T.Madhu and B.M.Reddy, “Modelling of foF2 using Neural Networks”, 38th Annual convention and meeting, Indian Geophysical Meeting, 18-20th Dec.2001, Visakhapatnam.
G.Sasi Bhushana Rao, A.D.Sarma, K.Ramalingam and Niranjan Prasad, “Analysis of IPPS due to INWAAS reference stations”, 38th Annual convention and meeting, Indian Geophysical Meeting, 18-20th Dec.2001, Visakhapatnam.
A.D.Sarma, “Grid Ionospheric Vertical Error analysis in the context of WAAS”, The Asian GPS Conference, pp.9-11, 29-30 October 2001, New Delhi.
A.D. Sarma, K. Ravindra and M.V.S.N. Prasad, “Modelling of Path Loss of UHF Mobile Link for Railway Network”, Tech. Vol., XVII National Convention of “Electronics and Telecommunication Engineers” and National Seminar on “Opportunities and Challenges in Communication Engineering – Vision 2020”, PP.3.10 – 3.14, 19 – 21 Oct., 2001, Hyderabad.
B. Sridhar, A.D. Sarma, Y. Ravi Kumar and K. Ravindra, “Development of RNGs for Simulation of Mobile Communication Channel”, Tech. Vol., XVII National Convention of “Electronics and Telecommunication Engineers” and National Seminar on “Opportunities and Challenges in Communication Engineering – Vision 2020”, PP.3.15 – 3.18, 19 – 21 Oct., 2001, Hyderabad.
A.D. Sarma, N.S. Murthy Sarma, T. Madhu and B.M. Reddy, “ Modelling of TEC over India using the IRI-90 and Indian hmF2 data”, Beacon Satellite Symposium, Boston College, MA, USA, 3-6 June, 2001.
A.D. Sarma, K. Ravindra and D.C. Reddy, “TEC Measurements in Equatorial region using dual frequency GPS receiver ”, International Workshop on Space Weather Effects on Communication and Navigation Satellite Signals,, Boston College, MA, USA, 7-8 June, 2001.
John.A. Klobuchar, P.H. Doherty, A. Das Gupta and A.D. Sarma, “Equatorial Anomaly Gradient Effects on a space-based Augmentation System ”, Beacon Satellite Symposium, Boston College, MA, USA, 3-6 June, 2001.
A.D.Sarma, V.Venkata Rao and G.Sasi Bhushana Rao, “Simultaneous Measurements of TEC in Multiple directions using dual Frequency GPS receiver”, International Conference on Time and Frequency, National Physical Laboratory, New Delhi, Feb.6-7, 2001.
G. Sasibhushana Rao, A.D. Sarma and V. Venkata Rao, “Interpolation of Ionospheric delay from IGP data for INWAAS”, ICORG – 2001, PP.480 – 484, Feb. 2001.
A.D. Sarma and Niranjan Prasad, “Geostationary satellites for INWAAS”, ICORG – 2001, PP.147 – 151, Feb. 2001.
G. Sasi Bhushana Rao and A. D. Sarma “Grid Ionospheric Vertical Error Analysis for INWAAS”, 37th Annual Convention and Meeting on “The Earth and its Climate”, Cochin, 19-21 December, 2000.
A.D. Sarma, N.S. Murthy Sarma, T. Madhu, Dr. B.M. Reddy and Dr. R.S. Dabas, “Comparison of electron density profiles due to IRI-90 and measured Indian hmF2”, 37th Annual Convention and Meeting on “The Earth and its Climate”, Cochin, 19-21 December, 2000.
V. Venkata Rao and A. D. Sarma “Methods to improve TEC measurement accuracy using GPS”, 37th Annual Convention and Meeting on “The Earth and its Climate”, Cochin, 19-21 December, 2000.
A.D.Sarma, S.Yugandhar, Y.Ravi Kumar and K.Subba Rao, “Evaluation of DSPN signals in the presence of dense scatter environment”, APSYM-2000,Dept. of Electronics, Cochin University of Science and Technology, Kochi-682 022, India, 6-8 Dec.2000.
G. Sasi Bhushana Rao, A. D. Sarma, and V. Venkata Rao, “A real –time algorithm to estimate the ionospheric grid point(IGP) value for Indian WAAS ” APSYM-2000,Dept. of Electronics, Cochin University of Science and Technology, Kochi-682 022, India, 6-8 Dec.2000.
K.Ravindra, A.D.Sarma and N.S.Murthy Sarma, “Estimation of field strength using UTD for cellular environments”, sent to APSYM-2000, Dept. of Electronics, Cochin University of Science and Technology, Kochi-682 022, India, 6-8 Dec.2000.
A.D.Sarma, “GPS Applications in Ionospheric Areas”, (Invited Paper), National Seminar on Advances in GPS Technology and its Application Potential, Aeronautical Society of India and MIT Alumini Association, 24th Nov.2000.
A.D.Sarma, G.Sasibhushana Rao and V.Venkata Rao, “SCORE algorithm for improving GPS accuracy in low latitude regions", Proceedings of ISAP2000, Japan, pp-337-340, 2000.
A.D. Sarma, N.S. Murthy Sarma and T. Madhu, “An Ionospheric time delay model for space bound objects up to a height of 300 Km”, Book of Abstracts, 11th National Space Science Symposium (NSSS-2K), Puri, P.164, March, 1-4, 2000.
A.D.Sarma and G.Sasibhushana Rao, “Unaugmented GPS for aircraft landings”, Seminar on Advances in Aerospace Technologies (SAAT - 2000)", Jan.21-22, 2000, Hyderabad, India.
A.D.Sarma and V.Venkat Rao, “Effect of ionospheric scintillations on INWAAS “, 36th annual Convention and meeting on Earth System sciences in the next millenium, Pondicherry Uni. Pondicherry, 21-23 Dec.1999.
A.D.Sarma and G.Sasibhushana Rao, “Ionospheric reference station placement INWAAS”, 36th annual Convention and meeting on Earth System sciences in the next millennium, Pondicherry Uni. Pondicherry, 21-23 Dec.1999.
A.D.Sarma, R.J.Hill, “Neural Network based raindrop size distribution model for millimeter wave applications”, Radar Symposium, Dec.14-17, 1999, Bangalore.
A.D.Sarma, G. Sasibhushana Rao and V.Venkat Rao, “SCORE algorithm based GPS to complement surveillance radar for air traffic control applications”, Radar Symposium, Dec.14-17, 1999, Bangalore.
A.D.Sarma, M.V.S.N.Prasad and Prof.S.N.N.Pandit, “Modelling of path loss for land mobile cm and mm wave communication systems”, INCEMIC Conf. on Dec 6-8, 1999, New Delhi.
K.Ravindra, A.D.Sarma, “Modelling path loss in the near field region for cm and mm wave mobile communications “ INCEMIC Conf. on , Dec 6-8, 1999, New Delhi.
N.S.Murthy Sarma and A.D.Sarma, “Principal plane analysis of a monopole antenna on a rocket shaped structure using UTD”, INCEMIC Conf. on Dec 6-8, 1999, New Delhi.
A.D.Sarma and Ravindra, “Comparison of path loss models for land mobile communications systems”, Proc. of APSYM - 98, pp.51-54, December 15-16, 1998, Department of Electronics, Cochin University of Science and Technology, Cochin - 682 022, INDIA.
N.S.Murthy Sarma, A.D.Sarma and K.R.Venkat Ramani, “3-D radiation pattern analysis of a monopole mounted on a cuboid”. Proc. of APSYM - 96, pp.162-165, December 15-16, 1998, Department of Electronics, Cochin University of Science and Technology, Cochin - 682 022, INDIA.
A.D.Sarma and N.S.Murthy Sarma, “Near field radiation pattern analysis of on-aircraft antennas using UTD”, Fifth Int.Conf.on Electromagnetic Interference and compatibility (INCEMIC-97), pp.167-170, Dec.3-5, 1997, Hyderabad.
A.D.Sarma and N.S.Murthy sarma, “Ionospheric Time Delay Estimation From Ground To Space Bound Objects”', Proc. International Conference On GIS/GPS (ICORG-97), J.N.T.University, PP; 155- 159, June 19- 21, 1997.
A.D.Sarma and N.S.Murthy sarma, “ Modelling Of Ionospheric Time Delay For Low Latitude Regions”, Proc. National Conference On GPS Oraganised by Aeronautical Society of India (Kanpur Branch) at Indian Institution of Engineers (India) Aerospace Division, PP.5, 21 - 23 Feb,1997.; ( Copy of Abstracts).
A.D. Sarma and M.V.S.N. Prasad, “Estimation of rain induced depolarisation at microwave frequencies”, Asia Pacific Microwave Conference, Dec- 17-20, 1996, New Delhi.
A.D. Sarma and R.J. Hill, “Dual frequency millimeter wave systems for scintillation measurements”, Proc. on 33rd Annual Convention and seminar on Geophysical Instrumentation, pp- 5-6, 18 - 20 December, 1996. (copy of Abstracts/ extended abstracts).
A.D. Sarma and Balakrishna B. and L.N. Merugu , “ Elevation plane pattern analysis of a monopole mounted on a composite ellipse”, Proc. of APSYM - 96 , November 12, 1996, Department of Electronics, Cochin University of Science and Technology, Cochin - 682 022, INDIA.
A.D.Sarma and R.S.Cole, “Measurement of dual frequency differential phase millimeter wave scintillation in an absorption region”, proceedings of the 7th URSI Commission F Open Symposium, Ahmedabad, 20-24 November, 1995, India.
A.D. Sarma, “Effect of Amplitude and Phase scintillations on the performance of millimeterwave Radar”, National Sym. on Modern trends in Electronics and Communication systems, Feb. 23--25, 1995, ECE, Andhra Univ., Waltair--530 003, INDIA.
A.D. Sarma, S. Srikanth, B. Balakrishna and P. Sasi Raj, “Radiation pattern analysis of On-aircraft antennas”, National Sym. on Modern trends in Electronics and Communication systems, Feb. 23--25, 1995, ECE, Andhra Univ., Waltair--530 003, INDIA.
A.D. Sarma, “Effect of temperature on Rain induced Attenuation at Microwave frequencies”, 31st annual convention and meeting on Geosciences for energy and environment, 20--22, Dec.1994, NGRI, Hyderabad--500 007, INDIA.
A.D. Sarma, “Rain Induced Attenuation on Personal Communication Systems”, IETE, ATC – 1993 on Personal Communication Systems and Enabling Technologies, 1-2, Oct. 1993, IETE Hyderabad centre, INDIA.
A.D. Sarma and S. Srikanth, “Ionospheric time delay effect on Global Positioning System”, Proceedings of APSYM--94, Nov.17--19, 1994, National Sym. on Antennas and propagation, Cochin Univ. of Science and Technology, Cochin--682 022, INDIA.
A.D. Sarma, R.J. Hill and R.J. Lataitis, “Effect of rain on millimeter wave amplitude scintillation spectra”, International Conference on Millimeter Wave and Microwave (ICOMM) 90, Defence Electronics and Application Laboratory, Dehradun-248001, Dec. 19--21, 1990, India.
A.D. Sarma and R.J. Hill, “Rain--induced attenuation at millimeter wave frequencies: Theory and Experiment”, National Radio Science Meeting, Boulder, USA, Jan.3--5, 1990.
R.J. Hill, S.F. Clifford, R.J. Lataitis and A.D. Sarma, “Scintillation of millimeter wave intensity and phase caused by turbulence and precipitation”, Proceedings of AGARD(NATO) 45th Symposium on Atmospheric Propagation in the UV, Visible, IR and mm-wave region and related systems, 9-13 Oct.1989, Copenhagen, Denmark.
R.S. Cole, A.D. Sarma and G.L. Siqueira, “Results from Millimetric studies on a 4Km urban path across Central London” Invited paper, IEE Colloquium on Millimeter wave propagation, London(U.K.), 29th January 1986, digest No.1986/7.
A.D. Sarma, R.S. Cole, G.L. Siqueira, L.A.R. da Silva Mello and F.C. Medeiros Filho, “Theoretical and experimental investigation of phase scintillations in an absorption region”, Tenth International Conference on Infrared and Millimeter Waves, Orlando, USA, December 1985.
Manga N.A., Lakshmanna, K., Sarma A.D., Koteswara Rao, N.V. and Pant T.K., “Effect of Amplitude Scintillations on the Tracking Error of IRNSS Receiver for Indoor Navigation Applications” Women In Engineering CONference (WIECON-2017), Women Institute of Technology, Dehradun, 18-19 Dec 2017.
Uttama G., Sarma A.D., Javeed, M.Q. and Koteswara Rao N.V., “Selective Suppression of IRNSS S-band Signals for Specific Applications”, Women In Engineering CONference (WIECON-2017), Women Institute of Technology, Dehradun, 18-19 Dec 2017.
G. Venkateswarlu and A.D. Sarma, “ Performance of Holt-Winter and Exponential Smoothing Methods for Forecasting Ionospheric TEC using IRNSS Data” 2nd IEEE International Conference on Electrical, Computer and Communication Technologies (ICECCT), 22-24 Feb 2017.
A. Supraja Reddy and A.D. Sarma, “Effect of Latitude and Longitude on bounding sigma at low latitude stations for GBAS Applications", IEEE International Women in Engineering (WIE) Conference on Electrical and Computer Engineering (WIECON-ECE 2016), 19 - 21 Dec., 2016 (Best Paper Award).
P. Sathish, D. Krishna Reddy and A.D. Sarma, “Preliminary Performance Evaluation of IRNSS-GPS-SBAS Receiver in terms of Position Accuracy and Velocity”, International Symposium on Antennas and Propagation APSYM 2016, 15-17 December 2016.
A. Supraja Reddy and A.D. Sarma, “Estimation of Residual Errors for Ground Based Augmentation of GPS", International Conference on Electronics and Communication Systems (ICECS) – 25th and 26th Feb., 2016.
A. Supraja Reddy and A.D. Sarma, “Computation of Selected Key Performance Parameters of GBAS for Precision Approach of Aircraft", International Conference on Electronics and Communication Systems (ICECS) – 25th and 26th Feb., 2016.
A. Supraja Reddy and A.D Sarma, “Analysis of the Effect of Anomalous Ionospheric Gradients on the Performance of Indian GBAS”, National Space Science Symposium (NSSS), SPL, VSSSC, Thiruvanthapuram, 9-12 Feb, 2016.
K.C.T. Swamy and A.D. Sarma, “Analysis of Adverse Space Weather Impact on Ionosphere TEC Behavior at Low Latitude Region”, National Space Science Symposium (NSSS), SPL, VSSSC, Thiruvanthapuram, 9-12 Feb, 2016.
N. Alivelu Manga, A.D. Sarma and N.V. Koteswara Rao, “Investigating the effects of Low Latitude Ionospheric Scintillations on GNSS/IRNSS Receiver Phase Locked Loop Bandwidth”, National Space Science Symposium (NSSS), SPL, VSSSC, Thiruvanthapuram, 9-12 Feb, 2016.
P. Sathish, A.D. Sarma and D. Krishna Reddy, “Study of Relativistic Effects on IRNSS Doppler Positioning in High Dynamic Conditions”, National Space Science Symposium (NSSS), SPL, VSSSC, Thiruvanthapuram, 9-12 Feb, 2016.
T. Sridhar, M. Pradeep and A.D. Sarma, “Precise Estimation of IRNSS Instrumental bias to Improve Ionospheric TEC measurement”, National Space Science Symposium (NSSS), SPL, VSSSC, Thiruvanthapuram, 9-12 Feb, 2016.
Uttama Ghosh, Sharath Chandra, A.D. Sarma and N.V.Koteswara Rao, “Minimization of Multipath Error to Improve Position Accuracy of GNSS/IRNSS”, National Space Science Symposium (NSSS), SPL, VSSSC, Thiruvanthapuram, 9-12 Feb, 2016.
Mohd Qurram Javeed, Quddusa Sultana and A.D. Sarma, “Comparison of Tropospheric delay models for Aircraft Take-off and Landing at GBAS Equipped Airports”, National Space Science Symposium (NSSS), SPL, VSSSC, Thiruvanthapuram, 9-12 Feb, 2016.
A.D.Sarma­­­­­* and A.Supraja Reddy, "Advantage IRNSS S-Band Signal for Precision Approach using LAAS under Ionospheric Storm Conditions", GNSS User Meet, ISRO-ISAC, Bengaluru, 08 Oct 2015.
Srinivas, V.S., Sarma, A.D., and Supraja Reddy, A. “Weighted Quasi-optimal and Recursive Quasi-optimal Satellite Selection Techniques for GNSS”, 14th International Ionospheric Effects Symposium (IES 2015), Alexandria, VA, USA, 12 – 14 May 2015.
A.D. Sarma, K.C.T. Swamy and P.V.D. Somasekhar Rao, “Forecasting of Ionospheric Scintillations of GPS L-Band Signals Over an Indian Low Latitude Station”, presented at IEEE International Symposium on Antenna and Propagation and USNC-URSI National Radio Science Meeting, Memphis, Tennessee, USA, 6-11 July 2014.
Satya Srinivas V., Sarma A.D. and Krishna Reddy D, “Ionospheric Time Delay Modelling using Anisotropic IDW”, presented at IEEE International Symposium on Antenna and Propagation and USNC-URSI National Radio Science Meeting, Memphis, Tennessee, USA, 6-11 July 2014.
Krishna Reddy D, Sarma A.D. and Satya Srinivas V., “Mobile Position Estimation with RSS Based Techniques in an Urban” presented at IEEE International Symposium on Antenna and Propagation and USNC-URSI National Radio Science Meeting, Memphis, Tennessee, USA, 6-11 July 2014.
Krishna Reddy D, Satya Srinivas V. and Sarma A.D., “Estimation of Plasmaspheric Electron Content at Low latitudes using GNSS Signals”, presented at IEEE International Symposium on Antenna and Propagation and USNC-URSI National Radio Science Meeting, Memphis, Tennessee, USA, 6-11 July 2014.
P. Yashasvi, A. Supraja Reddy, K. Satyanarayana and A.D. Sarma, “Estimation of Ionospheric Spatial Gradients for Indian GBAS using GAGAN TEC Data”, 29th National Conference of Electronics and Tele-Communication Engineers, October 29-30, 2013, Hyderabad.
G. Venkateswarlu, Shoeb Mohammad and A.D. Sarma, “Forecasting of Ionospheric Time Delay using Holt-Winter Method for GPS Applications in low latitude region”, International Conference on Advances in Computing, Communication and Informatics (ICACCI), 22-25 Aug, 2013.
G. Venkateswarlu, A.D Sarma and G. Vikram, “Characterization of Indian Ionospheric TEC Behaviour Using PDFs and GPS Satellite Data”, International Conference on Communication and Signal Processing, April 3-5, 2013, India.
Sultana, Q.; Sarma, A.D.; Javeed, M.Q., "Estimation of tropospheric time delay for Indian LAAS," International Conference on Emerging Trends in VLSI, Embedded System, Nano Electronics and Telecommunication System (ICEVENT), 2013 , vol., no., pp.1-5, 7-9 Jan. 2013 doi: 10.1109/ICEVENT.2013.6496529.
K.C.T. Swamy, A.D. Sarma, A. Supraja Reddy and V. Satya Srinivas, “Modeling of Amplitude Scintillations of GPS Signals with Coefficients Developed Using Data Over the Indian Region” , Pearl Jubilee International Conference on ‘Navigation and Communication (NAVCOM-2012)’, Hyderabad, INDIA, Dec 20-21, 2012.
Dhiraj Sunehra and A.D.Sarma, “Comparison and Validation of Instrumental Bias Results for Precise Navigation”, Pearl Jubilee International Conference on ‘Navigation and Communication (NAVCOM-2012)’, Hyderabad, INDIA, Dec. 20-21, 2012.
Satyanarayana K, Sarma A D and Malini M, “Development of Physiological Data Acquisition System and Evaluation of Vital Parameters with respect to location”, Pearl Jubilee International Conference on ‘Navigation and Communication (NAVCOM-2012)’, Hyderabad, INDIA, Dec 20-21, 2012.
P. Naveen Kumar, K.C.T. Swamy, A. Swetha and A.D.Sarma, “VTEC Estimation with Taylor Series Expansion Model Using GPS data for Low Latitude Region”, INDICON-2012(IEEE), Kochin, INDIA, Dec 7-9, 2012, DOI: 10.1109/INDCON.2012.6420650.
Supraja Reddy, B. Jhansi and A.D. Sarma, “Analysis of Future LAAS ‘Availability’ at Hyderabad Station for Precision Approach of Aircraft”, INDICON-2012(IEEE), Kochin, INDIA, Dec 7-9, 2012, DOI: 10.1109/INDCON.2012.6420738.
K.C.T. Swamy, A.D. Sarma, A.Supraja Reddy and Tarun Kumar Pant, “Analysis of Ionospheric Scintillations of GPS and VHF/UHF Signals over Low Latitude Indian Region”, WICT-2012(IEEE), Trivandrum, INDIA, Oct 30-Nov 2, 2012, DOI: 10.1109/WICT.2012.6409110.
P. Naveen Kumar and A.D Sarma, “Modeling of Ionospheric VTEC Using Taylor Series Expansion for GAGAN Applications”, 17th National Space Science Symposium (NSSS), SV university, Tirupati, February 14-17, 2012.
A.Supraja Reddy, V.Satya Srinivas and A.D.Sarma, “Performance Analysis of Divergence free Smoothing Technique for LAAS”, 17th National Space Science Symposium (NSSS), SV university, Tirupati, February 14-17, 2012.
K.C.T.Swamy, C. Praveen Kumar Reddy, P. Naveen Kumar and A.D.Sarm, “Analysis of Equatorial Ionization Anomaly Effect in Indian Region using Youthsat data”, 17th National Space Science Symposium(NSSS), SV university, Tirupati, February 14-17, 2012.
K.C.T.Swamy, A.D.Sarma, V.Satya Srinivas, and G.Venkateswarlu, “Modeling of Ionospheric Scintillations with Least Squares Adjustment Technique for GPS Applications”, 17th National Space Science Symposium (NSSS), SV university, Tirupati, February 14-17, 2012.
A.Supraja Reddy, M.R. Sriharsha, A.D.Sarma and D.Krishna Reddy, “Performance Evaluation of Single and Dual Frequency Carrier Smoothing techniques for LAAS”, IEEE Applied Electromagnetics Conference (IEEE AEMC - 2011), Kolkata, December 18-22, 2011.
K. Madhu Krishna, Quddusa Sultana, A. D. Sarma, A. Supraja Reddy and Y. Pandurangaiah “Compensation of Latency for Differential Pseudolite-Based Tracking System”, National Seminar on RATTS at GIET, Gunpur, Orissa, December 10-11, 2011.
K.C.T.Swamy, A.D.Sarma, V.Satya Srinivas, P.V.D.Somasekhar Rao, and G.Venkateswarlu, “Analysis of Ionospheric Scintillations Effect on Indian Satellite Based Augmentation System Receivers”, National Seminar on RATTS at GIET, Gunpur, Orissa, December 10-11, 2011.
V. Satya Srinivas, A. D. Sarma, D. Venkata Ratnam, and K.C.T. Swamy, “Application of MatLab Based IRI for efficient estimation of Time Delays in the Context of GNSS”, International Reference Ionosphere Workshop 2011, Hermanus, South Africa, October 10 – 14, 2011.
A.D. Sarma, V. Satya Srinivas, D. Venkata Ratnam and B.M. Reddy, “Robust Ionospheric Threat Model for Low Latitude Stations in the Context of GBAS”, Ionospheric Effects Symposium IES-2011, Alxandria, V.A., U.S.A, May 17-19, 2011.
Quddusa Sultana, A.Supraja Reddy and A.D.Sarma, “Estimation of Tropospheric Delay Error for a Pseudolite Based Tracking System”, The Twelth Antennas and propagation Symposium (APSYM 2010), Cochin University of Science & Technology, Kochi, December 14-16, 2010.
Quddusa Sultana, A.Supraja Reddy, G.Venkateswarlu and A.D.Sarma, “Augmentation of GPS with Pseudolites for Tracking Satellite Launch Vehicles”, The Twelth Antennas and propagation Symposium (APSYM 2010), Cochin University of Science & Technology, Kochi, December 14-16, 2010.
K.Yedukondalu, A. D. Sarma and Ashwani Kumar, “Mitigation of GPS Multipath Error using Recursive Least Square Adaptive Filtering” , 2010 IEEE Asia Pacific Conference on Circuits and Systems, Kuala Lumpur, Malaysia, December 6-9, 2010, ISBN: 978-1-4244-7454-7.
Quddusa Sultana, A.Supraja Reddy and A.D.Sarma, “DOP Analysis for Optimizing Pseudolite Based Tracking System Configuration”, The Third IETE Conference on RF & WIRELESS (Icon RFW-10), IETE Bangalore Centre, Bangalore, October 7-9, 2010.
P.Naveen Kumar, A.D.Sarma and K.C.T.Swamy “Analysis of Ionospheric Time Delay of EM signals due to IRI-2007 and Klobuchar Models for Indian Region”, the Third IETE Conference on RF & Wireless - 2010 (ICon RFW -10), 07-09 October 2010 at IETE Bangalore centre, Karnataka, India,.
Ashwani Kumar, A. D. Sarma, K. J. Silva Lorraine and D. Krishna Reddy, “Mitigation of Near-Far problem in Local Area Augmentation System”, 3rd Institution of Electronics and Telecommunication Engineers (IETE) Conference on RF & Wireless (ICon RFW-10), Banglore, India, 7-9 Oct. 2010.
K.Yedukondalu, A.D. Sarma and K. Sai Prasad, “Mitigation of GPS Multipath Interference Using Digital Filtering Technique”, The 3rd IETE Conference on RF & Wireless (ICon RFW – 10), 07-09 October, 2010, Bangalore, India.
A.D. Sarma, D. Venkata Ratnam, Sudha Ravindran and P.V. D. Somasekhar Rao, “Evaluation of Ionospheric Models Under Magnetic Storm Conditions for GAGAN . System”, Beacon Satellite Sympoisum, Barcelona, Spain, June 7-11, 2010.
A.D.Sarma, D. Venkata Ratnam, P. Naveen Kumar, G. Praveen, “Investigation of Magnetic Storm Effects on GAGAN System Using MMSE model”, 16th National Space Science Symposium (NSSS – 2010), Saurashtra University , Rajkot , February 24-27, 2010.
D. Venkata Ratnam, Ch. Sujhatha, K. Yedukondalu and A.D. Sarma, “Investigation of TEC Seasonal Variations using SHF Model”, 16th National Space Science Symposium (NSSS-2010), pp:91, 24-27 February, 2010.
National Space Science Symposium,24th-27th Feb.,2010.
V.Satya srinivas, A.D.Sarma and A.Supraja Reddy, “Effect of Ionospheric Gradients on Evaluation of GPS DOP”, 16th National Space Science Symposium (NSSS-2010), Saurashtra University, Rajkot, February 24-27, 2010.
D. Venkata Ratnam, CH. Sujatha, A. D. Sarma and Sudha Ravindran “Modelling of GAGAN TEC data using Spherical Harmonic Functions”, CODEC-09 international conference, December 14-16, Kolkota, 2009, ISBN: 978-1-4244-5073-2.
K. Yedukondalu, A.D. Sarma and V. Satya Srinivas, “ Multipath Mitigation Using LMS Adaptive Filtering for GPS Applications” (ÓIEEE 2009), 4th International Conference on Computers & Devices for communication, Institute of Radio Physics and Electronics, University of Calcutta, Kolkata, India, December 14-16 2009, ISBN:978-1-4244-4818-0.
V. Satya Srinivas, A.D. Sarma and K. Ravi Chandra, “Ionopsheric Time delay Statistics of GPS Signals at Low Latitude Stations”, National Symposium on Antennas and propagation (APSYM 2008), Cochin University of Science & Technology, Kochi, December 29-31, 2008.
Quddusa Sultana, A.D. Sarma and P.V.D. Somasekhar Rao, "Comparative Analysis of DOP Estimation Techniques for GPS", International conference on Recent Advances in Communication Engineering (RACE), Dept. of ECE, Osmania University, Hyderabad, December 20-23, 2008.
K. Yedukondalu, A.D. Sarma and V. Satya Srinivas, “Analysis of Multipath Interference Error of GPS Receiver”, International conference on Recent Advances in Communication Engineering (RACE), Dept. of ECE, Osmania University, Hyderabad, December 20- 23, 2008.
K. Ravi Chandra, P.Naveen Kumar and A.D.Sarma, “Analysis of TEC Estimation due to IRI-2007 Model for GAGAN Applications”, International Conference on Recent Advances in Communication Engineering (RACE-2008), Dept. of ECE, Osmania university, Hyderabad, December 20-23, 2008.
D.Venkata Ratnam, A.D. Sarma, P.V.D. Somasekhar Rao and B.M.Reddy, “Modified Ionospheric Tomography algorithm using GAGAN data”, URSIGA2008 International Conference, Chicago, USA, August 23-29,2008.
Dhiraj Sunehra, A.D. Sarma, D.R. Lakshmi, and B.M. Reddy, “Application of Least Squares Adjustment Technique for Estimation of TEC and Instrumental Biases for GAGAN Applications”, International Union of Radio Science, XXIXth General Assembly, Chicago, USA, August 7-16 ,2008.
A lecture, “Principles and salient features of GNSS” One week FDP on Principles of GNSS, Applications and Research Areas during 04-09 June 2018, organized by University College of Engineering (OUCE) and Chaitanya Bharathi Institute of Technology (CBIT), Hyderabad, 04 June 2018.
A lecture, “Research Related to GNSS” One week FDP on Principles of GNSS, Applications and Research Areas during 04-09 June 2018, organized by University College of Engineering (OUCE) and Chaitanya Bharathi Institute of Technology (CBIT), Hyderabad, 09 June 2018.
A lecture on “Code Phase and Carrier Phase Measurements”, One week school on GNSS Signal Processing during 04-09 December 2017, organized by Research and Training Unit for Navigational Electronics (NERTU), O.U., Hyderabad, 09 Dec 2017.
A lecture on “Salient Features in Engineering Research”, One Week (19 to 23 Dec.2016) Faculty Development Program(FDP) on Professional, Personal and Institutional Excellence By In House Training Centre(ITC), CBIT, Hyderabad 21 December 2016.
A lecture on “Overview of COMmunication INTelligence (COMINT) System”, a two day workshop on “COMmunication INTelligence (COMINT) Systems, jointly organized by ECE Dept., CBIT, and DLRL Hyderabad, 25-26 October 2016.
A lecture on “Recent Trends in the Area of GNSS for Aviation and Defense Applications”, a one day workshop on GNSS & its Applications, 19th October 2016.
A lecture on “Ionospheric Measurements and corrections for a GNSS Receiver” , 4-day course on “GNSS Signals and receiver Algorithms”, organized by Research and Training unit for Navigational Electronics (NERTU), Osmania University, Hyderabad, Dec 18-19, 2015.
A talk on “Navigation: Current Scenario and Emerging Demands”, at Engineers conclave 2014, organized by Indian National Academy of Engineering and Indian Space Research Organisation, at IISc, Bangalore, Oct. 30- Nov. 01, 2014.
A lecture on “Navigational Electronics”, at CVR College of Engineering, Hyderabad on 07 October, 2014.
A lecture on “Evaluation of Navstar, GPS concept from transit and Timation” at 3rd International training course on Navigation and Satellite Positioning Systems, Centre for Space Science and Technology Education In Asia and the Pacific, Organised by ISRO, Ahmedabad, June 16- July 11, 2014.
A lecture on “Modelling of Ionospheric Delay and Threats for GNSS and Augmentation Systems”, IETE, Hyderabad, 4th January 2014.
A lecture on “ Principles of GNSS Augmentation Systems and Atmospheric Constraints”, Dept. of Physics, Banaras Hindu University, Varanasi, 5th July, 2012.
A lecture on “Atmospheric effects on Satellite navigation systems” in the Four day Workshop on “Satellite Navigation Systems – their Application to Aviation and Atmospheric Science”, S. V. University, Tirupati, 30th March 2012 .
A talk on “Atmospheric Constraints on GPS Aided Navigation” in the 2nd International Workshop on “The Frontiers of Atmospheric Physics and Technology” organized by Yogi Vemana University, Kadapa, 2nd March 2012.
A talk on “ Atmospheric Effects on Millimeter wave propagation” in a Two Day Faculty Development Programme on “Recent Advances in Millimeter Radio Communications- RaMmCom'12”, Dept. of Telecommunications Engg, SRM University, Chennai, India (In Association with IEEE. Cossoc. & Gonzaga University, USA), 6th February 2012.
Invited talk on “Recent advances in satellilte based Navigation for Aviation”, in IEEE Applied Electromagnetic Conference (IEEE – AEMC), Kolkata on 21 December 2011.
A lecture in CEP course on “Advances in aircraft navigational aids and air wothiness challenges”, at Regional Centre for Military Airworthiness , Hyderabad 18th July 2011.
A talk on “GPS in the context of LBS”,Staff developement programme on B3G and Advanced Wireless Technologies at Dept. of ECE, Aurora’s Engg college, Hyderabad, 28th June 2011.
Lecture on “GNSS measurements and applications”, Course on Emerging Trends in GPS Tracking, at National Physics Laboratory, New Delhi on 27th December, 2010.
Lecture on “Integrated Survey with DGPS and Total Stations”, at a UGC Sponsored 21 day Refresher Course at IST, JNTU, Hyderabad, on 2nd November, 2010.
Lectures on “GNSS”, International Training Course on Satellite Navigation and LBS,African Regional Centre for Space Science and Technology Education (Affiliated to the United Nations), Obafemi Awolowo University Campus, ILE-IFE, Nigeria from 12th to 15th October, 2010.
Lecture on “Applications of GPS in Remote Sensing Atmospheric Parameters”, AOGS 2010 7th Annual General meeting, Hyderabad International Convention Center-India, 8th July, 2010.
Lecture on “Overview of GNSS and Applications”, SERC School on Space Weather 2010, at IIG, Navi Mumbai on 21st April, 2010.
Lecture on “Overview of GNSS and its Applications for Navigation and other Fields”, at Foundation Lecture at Al Habeeb College of Engineering, Hyderabad on 19th January, 2010.
Lecture on “Overview of GNSS”, at a CEP Course on 28th October 2009, at Defence Electronics Research Laboratory, Hyderabad.
Lecture on “Atmospheric Effects on Microwave and Millimeter Wave Systems”, at a presentation on 24th October, 2009, at Indian Institute of Science, Bangalore.
Lecture on “GNSS measurements and applications”, at a Course on “Emerging Trends in GPS Tracking” on 24th August 2009, at ITR, Chandipur.
Lecture on “Electronic Navigation Through GPS”, at a Refresher Course on Electronics, on 14th March 2009 at UGC Academic Staff College, Osmania University, Hyderabad.
Lecture on “Overview of GNSS and Applications” at a Two Day Course on “GEOMATICS Applications for Water Resources Management” on 17th March 2009, at JNTU(H) , Hyderabad.
Lecture on “Radio Meteorology and Radio Wave Propagation over the Sea for Indian Navy Officers”, 17th December 2008, during 4th Course at NPL, New Delhi.
Lecture on “Integrated Survey using Total Station & GPS”, 30th October 2008, during a 21-day UGC sponsored refresher course at JNTU, Hyderabad.
Lecture on “Smart Antenna”, 5th August 2008, during an Intensive Course at Dept. of Electronics & Communication Engineering, Osmania University, Hyderabad.
Lecture on “Satellite Navigation and LBS Center for Space Science and Technology Education in Asia and the Pacific”, 23rd June 2008, during an International Training Course (Affiliated to the United Nations), at Ahmedabad.
Lecture on “Mobile Computing”, 6th June 2008, during a National Workshop at Dept. of Computer Science & Engg., University College of Engineering Osmania University, Hyderabad.
Lecture on “Emerging Trends in Satellite Technology”, 19th February 2008, during a 5 Day Workshop at Sri Nidhi Institute of Science and Technology, Hyderabad.
Lecture on ‘GIS AND GPS applications’ at A Four-Week Orientation Course on May, 2007, UGC-Academic Staff College, JNTU, Kukatpally, Hydeabad-500072.
Lecture on ‘GPS Augmentation Systems’ at 2-Day Course on Global Positioning System: Augmentation & Applications in March 2007 at IETE, Hyderabad.
Lectures on ‘Modeling of Ionospheric Time delay for GPS Applications’, at DST Sponsored Training Course on “Global Positioning System Atmospheric and Ionospheric Studies, IIT Mumbai, on 2nd March 2007.
Lectures on ‘GAGAN –Program’, at the INCURSI – 2007, NPL, New Delhi on 23 Feb. 2007.
Lecture on “Location Based Services in 3G Communication, Signal Acquisition and Analysis and Overview of GNSS”, at the three week refresher course on “Advanced Communications” UGC-JNTU Academic Staff College, Hyderabad, on 21st November, 2006.
Lecture on “Antenna Analysis using UTD, Overview of GPS and SBAS”, at short term course on “Microwave Techniques”, Srinidhi Institute of Science and Technology, Hyderabad on 11th October 2006.
Lecture on “Overview of Global Positioning System”, Gokaraju Rangaraju Institute of Engg. & Technology, Hyderabad, 5th October 2005.
Lecture on “Signal Acquisition and Analysis”, ASPCS-05, KITS, Warangal, 20th September 2005.
Lecture on “Overview of Global Positioning System”, DLRL, Hyderabad, 21st September 2005.
Lecture on “Atmospheric effects on GPS”, JNTU, 20th December 2004, Hyderabad.
Lecture on “GPS and augmented systems”, Research Centre Imarat (RCI), 29th March 2004, Hyderabad.
Lecture on “GPS and its applications”, Programme AD complex DRDO, 10th March 2004, Hyderabad.
Lecture on “Navigation in GPS “, on 25th August, 2003, Koneru Lakshmaiah College of Engineering, Vijayawada.
Keynote address on “GPS and WAAS”, Technology Day, on 11th May 2003. National Geophysical Research Institute (NGRI), Hyderabad.
Lecture on “Radio Wave Propagation effects on Navigation and 3G Communication”, 28th February 2003, Muffakam Jah College of Engineering and Technology, Hyderabad.
Lecture on “Applications and Recent Trends in Signals and systems”, One day Seminar on Signals and Systems, 28th Dec.2002. R.V.R. and J.C College of Engineering, Guntur.
Lecture on, “The Principles of DGPS and WAAS relevant to India”, CEP Course on DGPS survey and tracking application, 25th Jul.2002, Interim Test Range, Chandipur, Balasore.
Lecture on “Frequency domain representation of discrete time signals and systems”, Short-term intensive course on Digital Signal Processing, 11th June 2002, Sree Nidhi Institute of Science and Technology, Hyderabad.
Lecture on “Applications and Recent Trends in Signals and systems”, Short term intensive course on Signals and Systems, 8th June 2002, Sree Nidhi Institute of Science and Technology, Hyderabad.
Lectures on “Antenna Analysis using GTD/UTD” CEP course on EW Antennas and Radars, 27 – 31 August, 2001, DLRL, Hyderabad.
Lecture on ‘GPS Applications in Ionosphere Areas’, national seminar on advances in GPS technology and is application potential, AAI, MIT alumni association, on 24th November 2000, Bangalore.
Lectures on “Satellite communications” to PGDTC students, on 19th November 2000, at University of Hyderabad, Hyderabad.
Lectures on “WAAS-Ionosphere” Workshop Group-A at ICAO on GSSP meeting at New Delhi on 14-16th October 2000. Organized by Airport Authority of India.
Lectures on “Mobile Propagation Path Loss Models” in Mobile Communications short course conducted on 23rd March 2000, by Dept. of ECE, Osmania University, Hyderabad.
Talk on “Characterization of Mobile Radio Channel sat, cm and mm wave lengths” in User researcher interaction seminar on fixed and mobile communications, on 12th November 1999 at National Physical Laboratory, New Delhi.
Delivered ten lectures on ‘Radio wave propagation’, to M.Tech students during period 23-28th April 1999, at Sri Venkateswara University, Tirupati, AP.
Delivered two lectures on “satellite aided communication, Navigation and surveillance “on October 1998, at ECE Dept. of R.V.R&J.C college of Engg., Chandramoulipuram, Chodavaram, Guntur, AP.
Delivered a lecture on “Satellite communication” on 15th June 1998 for college/University teachers, University of Hyderabad.
Delivered two lectures on “satellite aided Navigation and Radio wave propagation”, on June 1998 for college/University teachers at Academic staff college, Osmania University.
Delivered special lectures for intensive Training course on “Advances in Antenna Theory and Techniques” during 11-14th Aug 1997, held at SAC, ISRO, Ahmedabad.
Delivered lectures on “GTD/UTD” on 21st Aug 1996, during CEP course conducted by electronics and radar development establishment. Bangalore.
5. No. of Engineering students projects guided 67 Master of Engg. (M.E) Projects at Osmania University.
2 UG project of OU.
Areas of interest: GPS, SBAS, Green Communications Antenna Analysis using GTD, Radio Wave Propagation, MW and MMW systems.
3. Transmission Lines, Antennas and Propagation.
8. Member of several prestigious committees DRDO, ISRO, MIT etc.
10. Technical Advisor Advanced GNSS Research Laboratory (AGRL), University College of Engineering, Osmania University, Hyderabad.

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