On the Spectral Analysis of Backscatter Data Kendall E. Giles Department of Computer Science Johns Hopkins University Baltimore, MD 21218 kgiles@cs.jhu.edu David J. Marchette Naval Surface Warfare Center 17320 Dahlgren Road Dahlgren, VA 22448 marchettedj@nswc.navy.mil Carey E. Priebe Department of Mathematical Sciences Johns Hopkins University Baltimore, MD 21218 cep@jhu.edu