Abstract
T On the basis of time-reversal focusing theory, time frequency analysis combining with time reversal mirror (TRM) on detection of linear frequency modulation (LFM) signal in inhomogeneous medium is studied. The experiment on time frequency analysis is carried out in a lab water tank. A signal is received passively by a TRM, time-reversed and then re-transmitted into the same medium. The re-transmitted signal is received at the source and Wigner-Hough transform (WHT) analysis is performed. The time varying spectrum of time frequency analysis gives more useful information to recognize different types of target signals. The experiment results show that the new method can reduce cross-term and suppress multi-scattering. The approach is effective and feasible.
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