Tarun K. Chandrayadula

Associate Professor
Ocean Engineering Department
IIT Madras

Biography

Download Tarun K. Chandrayadula's curriculum vitae: PDF format

Biosketch

Tarun K. Chandrayadula is currently an associate professor in the Department of Ocean Engineering at Indian Institute of Technology Madras (2022). Prior to his appointment at IITM he was a National Research Council and Office of Naval Research Postdoctoral Fellow in the Department of Oceanography at Naval Postgraduate School (NPS) in Monterey, CA (2010-2013). Before NPS he was at George Mason University in Fairfax, VA getting his Doctor of Philosophy (Ph.D.) (2003-2010) and Master of Science (MS). (2001-2003) degrees in Electrical Engineering. He got his Bachelor of Engineering (B.E.) from Madras University. Most of his research has thus far been in wave propagation through random media, statistical signal processing, acoustic propagation models, inverse methods, and array spatial processing.

Education

  • 2010-2013
    Postdoctoral Research : Naval Postgraduate School, Monterey, California, USA - Dept of Oceanography
  • 2003-2009
    Doctor of Philosophy (Ph.D.) : George Mason University, Fairfax, Virginia, USA - Dept of Electrical Engineering
  • 2001-2003
    Master of Science (M.S.) : George Mason University, Fairfax, Virginia, USA - Dept of Electrical Engineering
  • 1997-2001
    Bachelor of Engineering (B.E.) : Madras University, Chennai, India - Electronics and Communication Engineering

Research Interests

The underwater acoustic medium causes challenges to signal processing applications. The peculiarities of the underwater medium : high degree of anisotropy and time variability are the main reasons for the challenges. The depth and range anisotropy are due to thermal gradients, oceanographic effects, and bathymetric interactions. The time variability is because of the changing oceanographic conditions. My research has thus far tried to incorporate acoustic propagation models in to signal processing methods. The acoustic propagation models focus on internal wave induced variability is range and time. The signal processing methods have use acoustic modes of the waveguide, which incorporate the propagation physics of the underwater medium. In order to describe the variability my research has used subspace based methods that account for the internal wave induced acoustic variability.

A primary focus of this research is the work with real data, from observations made in the ocean. I enjoy working with actual data. The observations come with noise, outliers, and more limitations than simulations. This type of work is painstaking, but worthwhile because it often throws unexpected results that help test and advance existing methods.

Research Projects

Hydroacoustic studies for the Indian Ocean Region

Teaching

Jan – May

OE 5087

Ocean Instrumentation

OE 5170

Ocean Acoustics

Aug – Dec

OE 5110

Experimental Methods and Measurements

Aug – Dec

OE 2023

Marine Instrumentation Lab

Students

G.~Chandrasekar (since Aug 2021) : Ph.D. student, full-time.

R. P. Raju (since Aug 2017) : Ph.D. student, part-time. The student is a scientist at NPOL in the Ocean Sciences group.

Sameer Babu (since January 2018): Ph.D. student part-time. The student is a scientist at NPOL.

P. Sivaselvi : Ph.D. thesis submitted in 2022, degree is awaited.

Nikita R. Pinto : MS graduated in 2022 (Employed at Mathworks currently).

Publications

Sivaselvi Periyasamy and Tarun K. Chandrayadula, "The broadband transport theory approach to model internal wave induced scattering across deep water time-fronts", J. Acoust. Soc. Am. 153(2), 895-908 (2023).
Year of Publication : 2023

Nikita R. Pinto and Tarun K. Chandrayadula, "Long-term frequency changes of a potential baleen whale call from the central Indian Ocean during 2002–2019", JASA Express Letters, February (2021).
Year of Publication : 2021

Tarun K. Chandrayadula, Sivaselvi P, John A. Colosi, Peter F. Worcester, Matthew A. Dzieciuch, Rex K. Andrew, "Observations of low-frequency, long-range acoustic propagation in the Philippine Sea and comparisons with mode transport theory", J. Acoust. Soc. Am. 147(2), 877-897 (2020).
Year of Publication : 2020

John A. Colosi, Bruce D. Cornuelle, Matthew A. Dzieciuch, Matthew A. Dzieciuch, Peter F. Worcester, Tarun K. Chandrayadula, "Observations of phase and intensity fluctuations for low-frequency, long-range transmissions in the Philippine Sea and comparisons to path-integral theory", J. Acoust. Soc. Am. 146(1), 567-585 (2019).
Year of Publication : 2019

Tarun K. Chandrayadula, Kathleen E. Wage, Peter F. Worcester, Matthew A. Dzieciuch, James A. Mercer, Rex K. Andrew, and Bruce M. Howe, "Reduced rank models for travel time estimation of low mode signals measured during the Long Range Ocean Acoustic Propagation EXperiment", J. Acoust. Soc. Am. 134(4), 3332-3346 (2013).
Year of Publication : 2013

John A. Colosi, Tarun K. Chandrayadula, Alexander G. Voronovich, and Vladmir E. Ostashev, "Coupled mode transport theory for sound transmission through an ocean with random sound speed perturbations: Coherence in deep water environments." J. Acoust. Soc. Am. 134 (4), 3119-3133 (2013).
Year of Publication : 2013

Tarun K. Chandrayadula, John A. Colosi, Peter F. Worcester, Matthew A. Dzieciuch, James A. Mercer, Rex K. Andrew, and Bruce M. Howe, "Observations and transport theory analysis of low frequency, long range acoustic mode propagation in the Eastern North Pacific Ocean", J. Acoust. Soc. Am. 134(4), 3144-3160 (2013).
Year of Publication : 2013

Resources

A quick introduction to acoustic sources in the ocean, metrics, and propagation.

Ocean Acoustics for the layperson. Plenty of videos, and also sample sounds from ocean.

Introductory course on digital signal processing by Jack Schaedler. Website uses animations to illustrate concepts such as aliasing, and sampling.

Contact

Address
109 B, Ocean Engineering,
IIT Madras, Chennai 600036
Phone Number
91-044-22574808
Mobile Number
9176001526
Email
tkchandr@iitm.ac.in
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