Multi-frequency Acoustic Doppler Controller Sampling
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Solution Overview
Problem
Existing multi-frequency acoustic Doppler systems are bulky and expensive due to their independent design, which causes cross-talk and interference when operating at the same frequency, limiting their ability to effectively collect data in aquatic environments.
Innovation Solution
A modular acoustic subsystem controller that connects multiple acoustic transceivers and transducers operating at different frequencies, allowing for centralized control and sampling of analog signals with a digital circuit that samples pairs of signals separated by an integer number of periods, reducing interference and enabling efficient data collection across various aquatic environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple acoustic transceivers operate independently at the same frequency, then each transceiver can function autonomously, but cross-talk and interference occur between transducers
Solution Approach 1:
The patent combines multiple acoustic transceivers operating at the same frequency into a single integrated system with a shared controller and common coordinate system. This merging eliminates cross-talk and interference that occur when transducers operate independently, while maintaining the reliability of autonomous operation through centralized control management.
2Object-affected harmful factors
If multiple acoustic transceivers operate at different frequencies, then interference is reduced, but the system becomes bulky and expensive
Solution Approach 1:
The patent changes the operating parameter from frequency differentiation to temporal-spatial coordination. Multiple transceivers operate at the same frequency but are controlled to transmit and receive signals in coordinated time slots and spatial patterns, eliminating interference without requiring different frequencies. This reduces system complexity and cost while maintaining effective interference reduction.
3Adaptability or versatility
If a single controller manages multiple acoustic transceivers, then system integration is improved, but control complexity increases
Solution Approach 1:
The patent implements a universal controller that manages multiple acoustic transceivers through a unified control architecture. The controller performs multiple functions including signal generation, timing coordination, data processing, and adaptive control for different transducer configurations. This multi-functional approach improves system integration while managing control complexity through standardized interfaces and procedures.
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 solution allows for efficient operation of multiple acoustic systems at different frequencies, reducing interference and enabling real-time data collection with improved accuracy and cost-effectiveness, suitable for various aquatic applications such as velocity profiling and navigational mapping.
Implementation Method 1
Multi-frequency, multi-beam acoustic doppler system
Data Source
Figure 1A
Figure 1B
Figure 1B-A
AI summary
An acoustic Doppler system including an acoustic subsystem controller operatively connected to a plurality of acoustic transceivers, with a first of the plurality of acoustic transceivers, operating at a first acoustic frequency, operatively connected to a first group of at least one transducer, and a second of the plurality of acoustic transceivers, operating at a second acoustic frequency, operatively connected to a second group of at least one transducer, where the acoustic subsystem controller includes a digital circuit configured to sample analog signals received from the first and second groups of transducer in pairs having a pair-wise sampling frequency that is four times the operating frequency of associated acoustic transceiver. Also presented is a method of sampling acoustic Doppler signals received from such devices, with samples comprising a pair of values taken with a pair- wise sampling frequency that is four times the operating frequency of associated acoustic transceivers, and the resulting pairs of values being further processed as representative values of the cosine and sine components of a Doppler-shift signal.