Abstract
The filtering of mode 1 and mode 2 by using a vertical array of nine hydrophones has been realized in the frequency range of 250–800 Hz in the shallow water of the Yellow Sea with a near‐perfect isovelocity condition. The eigenfunctions of the mode were calculated by using two parameters (P, Q) to describe the characteristics of the bottom reflections approximately at small grazing angles. The results of the mode filtering were quite good: (1) The group delay measurements of mode 1 and mode 2 agree well with the theoretical value calculated by using the bottom reflection phase shift parameter P; (2) The parameter Q of the bottom reflection loss can be extracted from the amplitude ratio of mode 1 and mode 2. The extracted values of Q were quite near to the values of Q obtained by other approaches.
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