1. Assistant Professor, Lyles School of Civil Engineering, Purdue Univ., West Lafayette, IN 47907 (corresponding author).
2. Ph.D. Student, School of Electrical and Computer Engineering, Purdue Univ., West Lafayette, IN 47907.
3. Member of Technical Staff, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109.
4. Group Supervisor, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109.
5. Member of Technical Staff, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109. E-mail: mailto:
6. Senior Research Scientist, Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109.