Joint estimation method for distance and depth of active underwater acoustic target in deep sea reliable sound path

The invention provides a deep sea reliable sound path active underwater sound target distance and depth joint estimation method. The joint estimation method comprises the following steps: (1) constructing a measurement sound field; (2) acquiring a relational graph of a target distance R and echo time delay tau; (3) extracting target echo data, and estimating the echo time delay tau of the target; (4) estimating a target distance R according to the echo time delay tau; (5) calculating an arrival pitch angle # imgabs0 # of an echo signal according to the target distance R; (6) constructing a copy field echo broadband interference structure Brpl (omega, z); (7) calculating the broadband interference structure Bdata (omega) of the actually measured target echo; and (8) constructing an ambiguity plane Amb (z) by matching the broadband interference structure Bdata (omega) of the echo of the copy field under the assumed target depth z with the broadband interference structure of the echo of the actually measured tar