Sonar Channel Isolation via Frequency Differentiation
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Solution Overview
Problem
Conventional multichannel ranging sensor systems, such as sonar, radar, and lidar, face challenges in manufacturing compact, reliable, and high-quality systems due to inter-channel pickup issues, which complicate data interpretation and increase manufacturing costs.
Innovation Solution
A multichannel sonar system with adjustable sonar transducer assemblies and modules, utilizing distinct transmission signals and signal processing techniques to isolate channels, reduces inter-channel pickup by generating contrasting frequency content and applying replica correlation processing to exclude unwanted signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensor channels are used to provide broader and more detailed sensory coverage, then the quality and resolution of sonar data are improved, but inter-channel pickup issues occur that complicate data interpretation and increase manufacturing costs
Solution Approach 1:
The system divides the multichannel sonar system into separate processing paths, with each channel processed independently through dedicated correlation processing. This segmentation allows isolation of channel-specific signals while maintaining overall system integration, resolving the contradiction between multi-channel coverage and data interpretation complexity
Solution Approach 2:
The system changes the temporal parameter of transmission signals by using distinct pulse patterns and timing sequences for different channels. This parameter differentiation enables the receiver to distinguish between channels through correlation processing, improving data quality while managing system complexity through systematic signal variation
2Measurement precision
If multiple sensor channels are used to provide broader and more detailed sensory coverage, then the quality and resolution of sonar data are improved, but manufacturing costs increase
Solution Approach 1:
The system uses universal correlation processing circuitry that can handle multiple channels through software or firmware configuration rather than requiring separate hardware for each channel. This multi-functional approach maintains high data quality across multiple channels while reducing manufacturing costs through component reuse and standardized processing paths
3Reliability
If transmission signals with different characteristics are applied to each channel, then channel isolation is improved and inter-channel pickup is reduced, but signal processing complexity increases
Solution Approach 1:
The system implements correlation processing that compares received signals against stored transmission signal patterns, providing feedback-based verification of channel identity. This feedback mechanism reliably distinguishes between channels while using efficient algorithms to manage processing complexity
Solution Approach 2:
The system pre-generates and stores correlation templates for each channel's transmission signal pattern before actual sonar operation. This preliminary preparation of processing references enables rapid channel identification during operation, improving isolation reliability while reducing real-time processing complexity
Data Source
AI summary
Techniques are disclosed for systems and methods to provide accurate and reliable compact sonar systems for mobile structures. A sonar system includes multiple sensor channels, each comprising a sonar transmitter and a sonar receiver, and a logic device configured to provide control signals and receive sensor signals from the sensor channels. The logic device is configured to provide transmission signals to sonar transducer assemblies, where signal patterns of the transmission signals are differentiated based at least in part on frequency content. Acoustic returns are processed using the signal patterns to reduce inter-channel pickup between the sensor channels. Resulting sonar data and/or imagery may be displayed to a user and/or used to adjust a steering actuator, a propulsion system thrust, and/or other operational systems of the mobile structure.