Towed Sonar Adaptive Filtering for Ship Noise Elimination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Towed sonar antennas face significant background noise interference from a ship's own systems, such as diesel engines and propellers, which limits the effectiveness of underwater object detection and can complicate sonar system performance, especially in surface ships with towed antennas.
Innovation Solution
A method involving adaptive filtering of spatially resolved waterborne sound signals using a towed sonar antenna to identify and remove quasi-direction-dependent intrinsic noise, allowing for the elimination of interference from the ship's own noise and potentially other ships in a convoy, by determining and isolating a reference waterborne sound signal and applying filtering techniques like the least mean squares algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a towed sonar antenna is used for underwater detection, then the detection capability is improved, but the ship's own noise interferes with the detection performance
Solution Approach 1:
The patent extracts and separates the ship's own noise from the sonar signal by using a reference channel that captures only the ship's noise. This reference noise is then used in an adaptive filter to remove the corresponding interference from the sonar signal, effectively taking out the harmful component while preserving the useful underwater detection signal.
Solution Approach 2:
The patent introduces a reference channel as an intermediary that captures the ship's noise separately. This reference channel acts as a mediator between the ship's noise source and the sonar signal processing, enabling the noise to be identified and removed without directly interfering with the primary detection function.
2Reliability
If adaptive filtering is applied to remove ship noise, then the signal quality is improved, but the system complexity increases
Solution Approach 1:
The patent segments the signal processing into distinct functional blocks: a reference channel for noise capture, an adaptive filter for noise removal, and a signal output stage. This segmentation allows the complex adaptive filtering operation to be implemented in a structured manner, making the system more manageable and easier to implement despite the increased complexity.
Data Source
Figure 1~2
AI summary
The invention relates to a method for eliminating a reference underwater sound signal from a resolved underwater sound signal, said method comprising the following steps: - detecting the resolved underwater sound signal by means of a sonar antenna, in particular a towed array sonar antenna, such that individual beams are obtained, which each contain a portion of the resolved underwater sound signal, and - adaptive filtering of the resolved underwater sound signal depending on the reference underwater sound signal.