Sidescan Sonar 3D Imaging via Phase Difference Processing
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Solution Overview
Problem
Conventional sonar systems face limitations in producing accurate 3D images of underwater environments, particularly in terms of depth and topography, due to the complexity of processing sonar returns from multiple transducer elements and the need for precise distance and angle calculations.
Innovation Solution
The sonar system employs a configuration with multiple sidescan transducer arrays and a signal processor that calculates phase differences and distances between transducer elements to generate 3D mesh data, allowing for the creation of detailed 3D images of underwater environments by processing sonar returns from multiple angles and distances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sonar systems use single transducer elements to transmit and receive sonar pulses, then the system structure is simple, but the ability to generate accurate 3D images and determine precise angles to objects is limited
Solution Approach 1:
The sonar system divides the transducer function into multiple separate transducer elements arranged in arrays. The transmit function is segmented from the receive function, with multiple receive elements positioned at different locations. This segmentation enables the system to receive sonar returns from multiple angles simultaneously, allowing precise determination of object angles through phase difference calculations between signals received at different elements.
Solution Approach 2:
The patent transitions from single-element sonar to multi-element arrays, adding spatial dimensionality to the system. By positioning receive elements at different spatial locations and processing phase differences between their signals, the system gains angular information in addition to range information, enabling 3D image generation and precise angle determination.
2Measurement precision
If sonar systems process returns from multiple transducer elements to determine angles, then angle measurement precision improves, but the complexity of signal processing and distance calculations increases
Solution Approach 1:
The signal processing system continuously analyzes phase differences between signals received at multiple transducer elements and uses this feedback to calculate precise angles to objects. The processed angular information is then used to generate 3D images and update the representation of the underwater environment, creating a closed-loop system that improves measurement precision through systematic signal processing.
Solution Approach 2:
The patent introduces an intermediary signal processing stage that receives raw sonar returns from multiple transducer elements and transforms them into angular and spatial information. This intermediary processing layer, which includes phase difference calculation and 3D image generation, mediates between the physical transducer array and the final output, managing the complexity of converting multi-element signals into meaningful spatial data.
3Loss of information
If conventional sonar systems transmit sonar pulses and receive returns to determine object location, then basic detection is achieved, but detailed 3D imaging and topography mapping capability is insufficient
Solution Approach 1:
The patent combines the functions of multiple transducer arrays (transmit array and receive arrays) to create a unified sonar system capable of 3D imaging. By merging the signals from multiple receive elements with the transmitted pulse information and processing them together through phase difference calculation, the system reconstructs detailed 3D representations of the underwater environment, preserving information about object position, angle, and topography.
Solution Approach 2:
The system transitions from 2D sonar imaging to 3D imaging by utilizing multiple transducer elements positioned in three-dimensional space. The additional spatial dimension provided by the array configuration enables the system to determine not only range but also angular position, creating comprehensive 3D images and topography maps of the underwater environment.
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 configuration enables the generation of accurate and detailed 3D images of underwater environments, improving the ability to map topography and detect objects, such as fish and wreckage, with enhanced precision and clarity.
Implementation Method 1
Sonar transducer elements, or simply transducers, may convert electrical energy into sound or vibrations at a particular frequency
Implementation Method 2
The transducer may receive the reflected sound (the 'sonar returns') and convert the sound energy into electrical energy
Implementation Method 3
The sonar system may include a sonar signal processor configured to process the first sonar return data and the second sonar return data to generate 3D mesh data based on at least the predetermined distance between the first sidescan transducer element and the second sidescan transducer element
Implementation Method 4
Based on the known speed of sound, it is possible to determine the distance to and/or location of the waterborne or underwater objects
Data Source
AI summary
Provided are a sonar system and transducer assembly for producing a 3D image of an underwater environment. The sonar system may include a housing mountable to a watercraft having a transmit transducer that may transmit sonar pulses into the water. The system may include at least one sidescan transducer array in the housing that receives first and second sonar returns with first and second transducer elements and converts the first and second returns into first and second sonar return data. A sonar signal processor may then generate a 3D mesh data using the first and second sonar return data and at least a predetermined distance between the transducer elements. An associated method of using the sonar system is also provided.