Subsea Acoustic Telemetry Adaptive Positioning
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Solution Overview
Problem
Subsea acoustic telemetry faces challenges such as signal absorption, noise interference, and signal distortion due to equipment and platform dynamics, limiting effective communication over long distances and in noisy underwater environments.
Innovation Solution
A method and system that utilize a network of subsea communication systems with intermediary devices to enhance signal transmission by adjusting the position and orientation of vessels, employing repeaters, smart signal processing, and adaptive channel optimization to minimize noise and distortion, and using multiple transducers and sensors to improve bandwidth and signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acoustic telemetry is used for subsea communication, then real-time monitoring and remote control are enabled, but signal absorption limits communication range
Solution Approach 1:
The patent introduces intermediary devices (repeaters, relays, or acoustic modems mounted on AUVs/ROVs) that receive acoustic signals and retransmit them through alternative means (optical, electromagnetic, or acoustic), effectively extending communication range by breaking the direct transmission path into multiple hops
Solution Approach 2:
The communication system is divided into multiple segments or hops, where signals are transmitted in stages through intermediate nodes rather than directly over long distances, reducing the impact of signal absorption at each individual hop
2Productivity
If high frequency acoustic signals are used, then data transmission rate is improved, but signal absorption increases
Solution Approach 1:
The system dynamically adjusts transmission parameters including frequency selection based on water conditions, distance, and required data rate, optimizing the balance between transmission speed and signal attenuation in real-time
Solution Approach 2:
The patent employs variable transmission parameters including frequency modulation, power adjustment, and coding schemes that adapt to channel conditions, allowing high data rates when conditions permit while maintaining reliability when absorption is high
3Reliability
If acoustic telemetry operates in noisy underwater environments, then communication capability is maintained, but noise from vessels and equipment degrades signal quality
Solution Approach 1:
The system incorporates feedback mechanisms where receivers monitor signal quality and noise levels, then communicate back to transmitters to adjust transmission power, frequency, or timing to avoid noisy periods or frequencies
Solution Approach 2:
Signal processing techniques extract the desired acoustic signal from the noisy background by filtering out characteristic noise patterns from vessels and equipment, separating useful information from harmful interference
4Adaptability or versatility
If platform dynamics are present, then real-world operational conditions are reflected, but motion induces signal distortion
Solution Approach 1:
The system performs preliminary calibration and characterization of platform motion effects during stationary or controlled conditions, then applies pre-computed correction factors or filters during actual operations to compensate for expected distortion
Solution Approach 2:
Mechanical stabilization systems are replaced with electronic signal processing and software-based correction algorithms that compensate for motion-induced distortion without requiring physical stabilization of the platforms
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables reliable and efficient communication over long distances by reducing noise interference, improving signal quality, and extending communication range through adaptive positioning and smart signal processing, thereby enhancing the effectiveness of subsea acoustic telemetry.
Implementation Method 1
acoustic telemetry can provide real-time monitoring and remote control of vehicles and subsea assets
Implementation Method 2
subsea acoustic telemetry experiences signal absorption over the medium (e.g., water)
Implementation Method 3
configuring the transmitters and receivers to share a common frequency band
Data Source
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AI summary
A method for transmitting signals in a subsea environment includes determining that a quality of an acoustic signal is below a threshold. The acoustic signal travels from a first device, through water in the subsea environment, to a second device. A parameter of the first device, the second device, or both is then adjusted to improve the quality of the acoustic signal when the quality of the acoustic signal is below the threshold.