Matched multipath source localization in deep ocean

This paper describes the relationship of matched field processing(MFP) and multipath delay localization(MDL). MDL is a simplification of MFP. Methods to analyse multipath structure, especially the lime range plot, in the deep ocean is presented. The coincidence between theory prediction and experiment data shows that the methods and programs could be used to determine multipath time delay structure A realistic method called L-2 norm match algorithm for MDL is developed. The depth-range ambiguous;figures are satisfactory. Comparing the match methods of absolute delay and relative delay shows that the latter is better than the former. In the case of known source depth a doublepath match plan is given. We can immediately determine the source distance from range-delay curves. The influence of inexact ocean environment parameters and receiver configuration on doublepath ranging is analysed.