Long-range acoustical positioning system on continental shelf regions

摘要

Methods and systems for determining a geophysical position of an object in an underwater channel are provided. Acoustic signals from at least two sources are received by a receiver of the object. The acoustic signals have a frequency corresponding to at least one waveguide mode associated with the underwater channel, where the acoustic signals are transmitted at predetermined transmission times. An arrival time for the at least one waveguide mode is determined from the received signals, based on the predetermined transmission times. The geophysical position is determined based on the arrival time and a modal group velocity for the at least one waveguide mode.

主权项

1. A method for determining a geophysical position of an object in an underwater channel, the method comprising:
receiving, by the object, acoustic signals from at least two sources, each received acoustic signal including one or more waveguide modes associated with the underwater channel excited by a frequency of the respective acoustic signal transmitted through the underwater channel, the acoustic signals being transmitted at respective predetermined transmission times; identifying a waveguide mode among the one or more waveguide modes in the received acoustic signals; determining a modal group velocity corresponding to the identified waveguide mode, based on a sound speed profile of each source and a frequency of the identified waveguide mode from the received acoustic signals; determining an arrival time for the identified waveguide mode from the received acoustic signals, based on the respective predetermined transmission times; and determining the geophysical position based on the arrival time of the identified waveguide mode and the modal group velocity for the identified waveguide mode.