Nautical Chart Depth Adjustment via Sonar Offset
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Solution Overview
Problem
Digitized nautical charts used in sonar systems are compromised by changing water levels, leading to inaccuracies in depth representations, as they typically assume a standard water level that can fluctuate due to various factors such as rainfall or tidal changes.
Innovation Solution
A method and system that adjust depth indicators on a nautical chart by calculating a water-level offset between the actual and standard water levels using sonar data, allowing for accurate representation of depth ranges and contour lines on a display device, incorporating techniques like interpolation and statistical analysis to ensure reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a digitized nautical chart assumes a standard water level, then the chart can be created and stored with fixed depth values, but the accuracy of depth representation deteriorates when water level changes occur
Solution Approach 1:
The system dynamically adjusts the nautical chart depth values based on real-time or historical water level data. Instead of using fixed depth values from the standard chart, the system applies water level offsets to update depth representations, allowing the chart to adapt to changing water conditions while maintaining accuracy
Solution Approach 2:
The system changes the depth parameter values on the nautical chart by applying water level offsets. When water level data indicates a change from the standard level, the system adjusts all or selected depth values on the chart accordingly, transforming the static chart into a dynamically accurate representation
2Measurement precision
If a user manually inputs water-level offset values, then the chart can be adjusted for water level changes, but the complexity of operation increases and measurement precision may be compromised
Solution Approach 1:
The system automatically determines water level offsets by comparing sonar-measured depths with chart-indicated depths without requiring manual user input. The system performs the comparison, calculation, and chart adjustment autonomously, eliminating the need for users to manually estimate and enter offset values while maintaining high measurement precision
Solution Approach 2:
The system uses sonar depth measurements as feedback to automatically calculate and apply water level offsets. By continuously comparing actual sonar depths with chart depths, the system self-corrects the chart representation, providing precise automatic adjustment without manual intervention
3Extent of automation
If sonar depth soundings are used to determine water level offset, then automatic adjustment is possible, but measurement precision may be affected by unreliable data points
Solution Approach 1:
The system automatically identifies and discards unreliable sonar depth readings from the calculation process. By filtering out anomalous or inaccurate measurements and using only reliable data points to determine the water level offset, the system maintains high calculation accuracy while achieving automatic adjustment
Solution Approach 2:
The system uses feedback from multiple sonar measurements to automatically calculate water level offset, comparing actual depths with chart depths and iteratively determining the most accurate offset value while filtering out unreliable data points
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 approach enhances the accuracy of water-level offset calculations, providing improved depth representation on nautical charts by averaging offset values across multiple locations and discarding unreliable data points, thus maintaining chart accuracy despite changing water levels.
Implementation Method 1
a sonar transducer producing electrical signals indicative of a sonar-indicated depth corresponding to a location on the body of water
Data Source
AI summary
Methods and sonar system for displaying a nautical chart and for adjusting depth indicators on the chart based on a calculated offset between the actual water level and the standard water level on which the chart is based. The offset is based on sonar soundings compared to depths indicated by the chart. The sonar system's processor automatically adjusts the chart's depth indicators to reflect the offset.