To monitor the navigation of a linear acoustic antenna towed, and devices for the implementation of such a process

摘要

Methods for controlling the navigation of a towed linear acoustic antenna are disclosed. 'Birds' (100) each comprising a body (301) with variable-incidence wings (302, 303) are attached to the antenna (103). The differential action of the wings enables the bird to be rotated about the longitudinal axis of the antenna to produce a hydrodynamic force in any given direction about said longitudinal axis of the antenna. Power and control signals are transmitted between the antenna and the bird by rotary transformers (306-310). The bird is attached to the antenna by means of a bore (305) sealed with a cover (325). When the antenna is raised, automatic means are used to detach the bird so that the antenna may freely be wound onto a raising drum. The deflection, immersion and bearing of the antenna may thus be fully controlled.