Research on the methods of multipath separation for shallow water wideband signal based on warping transformation

Abstract

For the research on the multipath characteristics of shallow water wideband signal, the methods of multi-path separation were explored. After the summary of all kinds of normal mode decomposition method and the combination with a new kind of non-linear signal processing transformation method Warping transformation, a new method of multi-path separation for shallow water wideband acoustic signal based on Warping transformation was proposed. With the transmitted signals limited on a time window and the received signal of the processing of pulse compression, the processed received signal had a processing of warping transform and time-frequency analysis, in this way, a method which has wide applicability and high precision on decomposition and information ex-traction of the normal mode was achieved. Finally, a conclusion was verified through a simulation, the new method can be used in the normal mode separation of the chirp transmitted signal with a certain length of time, and has a greater advantage compared with conventional Warping transform processing results. Meanwhile, the separation signals extracted were substantially identical with the original signal after inverse operation restore, which proved the accuracy of this method.