Extended range tracking doppler sonar
AssigneeTeledyne Instruments, Inc.
InventorJerker Taudien
Life of this patent
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Abstract
An underwater active sonar system and method for measuring instrument velocity with respect to a boundary surface is disclosed. The system includes an acoustic transducer configured to transmit and receive a plurality of acoustic beams in different directions. The system also includes a processor configured to detect a boundary surface within each beam; iteratively filter received acoustic signals backscattered from the transmitted beams with an adaptive filter and associated bandwidth that is successively decreased for each iteration; and measure instrument velocity with respect to the boundary surface.
Claims28
An underwater active sonar system for measuring instrument velocity with respect to a boundary surface, the system comprising:
- an acoustic transducer configured to transmit and receive a plurality of acoustic beams in different directions;
- and
- a processor configured to:
- detect a boundary surface within each transmitted beam;
- iteratively filter received acoustic signals backscattered from the transmitted beams with an adaptive filter and associated bandwidth that is successively decreased for each iteration, wherein the adaptive filter tracks a Doppler shift for each transmitted beam;
- and
- measure instrument velocity with respect to the boundary surface.
An underwater active sonar system for measuring instrument velocity with respect to a boundary surface, the system comprising:
- an acoustic transducer configured to transmit and receive a plurality of acoustic beams in different directions;
- and
- a processor configured to:
- detect a boundary surface within each transmitted beam by finding a peak response in a correlation coefficient signal;
- and
- measure instrument velocity with respect to the boundary surface.
An underwater active sonar system for measuring instrument velocity with respect to a boundary surface, the system comprising:
- an acoustic transducer configured to transmit and receive a plurality of acoustic beams in different directions;
- a transmitter module that transmits a phase coded sequence comprising repeating codes of alternating sign;
- and
- a processor configured to:
- detect a boundary surface within each transmitted beam;
- and
- measure instrument velocity with respect to the boundary surface.
A method of measuring instrument velocity with respect to a boundary surface using an underwater active sonar system, the method comprising:
- transmitting and receiving a plurality of acoustic beams in different directions;
- detecting a boundary surface within each transmitted beam;
- iteratively filtering received acoustic signals backscattered from the transmitted beams and associated bandwidth that is successively decreased for each iteration, wherein iteratively filtering includes tracking a Doppler shift for each transmitted beam;
- and
- measuring instrument velocity with respect to the boundary surface.
Dependencies are inferred from the claim text.