Abstract
The ray travel time has been used as the basic measurement for inversion of the sound speed structure in the conventional ocean acoustic tomography. There are cases where the ray theory is neither applicable nor convenient, especially for lower frequency and axial propagation in the ocean sound channel. In the present paper, a new method of ocean acoustic tomography has been developed; it is a full‐wave approach based on the adiabatic normal mode theory. Instead of the ray travel time, the modal phase difference perturbations are used for inversion—we call it “phase tomography.” The method is suitable for lower frequency, and it is also suitable for axial propagation; moreover, the range‐dependent sound‐speed structure can be obtained from the vertical slice inversions. The mathematical derivation will be presented and some possible ways of implementation will be discussed.
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