Acoustic Data Transmission System for Underwater Telemetry
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Solution Overview
Problem
Current underwater data transmission systems face limitations due to range and bandwidth constraints, as well as environmental noise, making them unreliable for effective acoustic data communication and telemetry in marine environments.
Innovation Solution
An acoustic data transmission system utilizing an acoustic transducer, encoder, and controller to encode messages as digitally encoded signals with high autocorrelation and low cross-correlation values, allowing for improved transmission accuracy and reliability through the use of a limited set of coded signals, which are transmitted and received via phase shift keying or other modulation techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional electromagnetic frequencies (RF and microwave bands) are used for underwater data transmission, then the system structure is simple, but the transmission range is limited and reliability is poor due to limited range in water media
Solution Approach 1:
The patent replaces electromagnetic field-based transmission with acoustic wave-based transmission. Acoustic waves propagate much farther in water than RF/microwave signals, achieving reliable communication at ranges exceeding 10 km while maintaining manageable system complexity through the use of acoustic transducers and coded signal processing
Solution Approach 2:
The patent changes the fundamental transmission parameter from electromagnetic frequency to acoustic frequency. By operating in the acoustic domain (typically 10-100 kHz range), the system achieves both extended range and improved reliability for underwater communication, overcoming the inherent limitations of RF systems in aquatic environments
2Length of moving object
If low frequency and very low frequency (VLF) systems are used, then electromagnetic transmission is possible, but substantial range, transceiver size, and bandwidth limitations occur
Solution Approach 1:
The patent substitutes acoustic transducers for electromagnetic VLF transceivers. Acoustic transducers can achieve comparable or superior transmission ranges without the massive size requirements of VLF equipment, as acoustic waves naturally propagate efficiently in water without requiring enormous antenna structures
Solution Approach 2:
By changing from electromagnetic VLF to acoustic frequency transmission, the system achieves extended range with compact transceiver dimensions. The acoustic medium naturally guides the waves, eliminating the need for large-scale electromagnetic infrastructure
3Reliability
If conventional acoustic data transmission is used, then underwater communication is possible, but range and bandwidth constraints occur due to multipath signal propagation, reverberation, Doppler spreading, signal reflection, refraction, fading, and absorption
Solution Approach 1:
The patent applies coded signal modulation before transmission, where sequences with specific autocorrelation and cross-correlation properties are pre-encoded into the acoustic signals. This preliminary coding structure enables the receiver to distinguish transmitted signals from multipath reflections and environmental noise, maintaining signal integrity despite propagation challenges
Solution Approach 2:
The system uses correlation-based detection where the received signal is correlated with the known transmitted code sequence. This feedback mechanism allows the receiver to extract the original signal even in the presence of multipath propagation, reverberation, and environmental interference, significantly improving communication reliability
4Measurement precision
If acoustic signals are transmitted through marine environment, then underwater communication is achieved, but environmental noise reduces transmission accuracy
Solution Approach 1:
The patent pre-encodes transmission signals with specific coded sequences that have optimized autocorrelation properties. When the received signal is correlated with the known code, the peak correlation value stands out clearly against environmental noise, enabling accurate signal detection even in noisy marine environments
Solution Approach 2:
The system employs correlation detection where the received acoustic signal is compared against the known transmitted code sequence. This feedback process enhances the signal-to-noise ratio by accumulating correlation energy over the code duration, allowing precise signal detection despite ambient marine noise
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
The system enhances the range and reliability of underwater data transmission by reducing noise interference and improving message compression, enabling effective communication in marine environments, including depths up to 10 km and beyond.
Implementation Method 1
An acoustic transducer (or suitable transmitter and receiver devices), adapted for communicating acoustic messages in the form of encoded signals propagating through a marine environment
Implementation Method 2
The encoder is adapted for encoding the messages in a format suitable for transmission through the acoustic medium, for example as a set of digitally encoded acoustic signals with relatively higher autocorrelation values and relatively lower cross correlation values
Implementation Method 3
communicating acoustic messages in the form of encoded signals propagating through a marine environment, or other subsurface acoustic medium
Data Source
AI summary
An acoustic communication and messaging system includes an acoustic transducer adapted for communicating signals via a subsurface acoustic medium, and a controller in communication with the acoustic transducer. The controller can include one or more of a signal programmer adapted for defining a limited set of coded signals; e.g., where each of the coded signals selected for low cross-correlation with other coded signals in the limited set, and a signal encoder adapted for defining a set of messages or commands; e.g., where each message is associated with a selected one of the coded signals in the limited set. The acoustic transducer can be adapted to transmit the coded signals associated with identified messages via the subsurface acoustic medium. An interface can be provided for identifying messages for coding and transmission, and for reporting decoded commands to a user.