Adaptive Echo Tracking for Radar Fill Level Measurement
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Solution Overview
Problem
Existing fill level measurement methods using travel time face challenges in accurately identifying the wanted echo signal, particularly when installed objects interfere with signal reflection and during changes in measurement conditions, leading to potential incorrect fill level readings and operational hazards.
Innovation Solution
A self-learning method that combines static and dynamic echo search algorithms to evaluate and track echo signals by adjusting masking and evaluation curves based on positional and amplitude changes, ensuring accurate identification and tracking of the wanted echo signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If static echo search algorithms are used to identify the wanted echo signal, then the measurement process is simple and fast, but the accuracy deteriorates when installed objects interfere with signal reflection or during changes in measurement conditions
Solution Approach 1:
The patent applies dynamics by transitioning from static echo search algorithms to dynamic echo tracking. The system continuously adapts to changing measurement conditions by tracking the wanted echo signal's position and amplitude over time, allowing the measurement process to respond to variations in the measurement environment while maintaining both speed and accuracy.
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously monitors echo signals and adjusts its identification criteria based on observed patterns. The echo tracking algorithm uses feedback from previous measurements to refine the identification of the wanted echo signal, improving accuracy without significantly increasing measurement time.
2Measurement precision
If echo tracking methods are used to improve accuracy during fill level changes, then the measurement precision is improved, but the device complexity increases due to continuous adjustment of evaluation parameters
Solution Approach 1:
The patent applies preliminary action by performing a first echo search to establish initial reference values for the wanted echo signal's position and amplitude before initiating continuous tracking. This preliminary step simplifies the subsequent tracking process by providing baseline data against which changes can be measured, reducing the overall computational complexity.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting evaluation parameters such as echo position and amplitude thresholds based on observed changes in the measurement environment. This allows the system to maintain high measurement precision while managing complexity through adaptive parameter adjustment rather than complex algorithmic structures.
3Reliability
If multiple echo search methods are combined to improve reliability, then the reliability of fill level measurement is improved, but the ease of operation deteriorates due to the complexity of parameter adjustment
Solution Approach 1:
The patent applies self-service by implementing a self-learning echo tracking algorithm that automatically adjusts its parameters based on observed echo signal patterns. The system performs self-calibration by identifying the wanted echo signal's characteristics during initial operation and continuously adapts without requiring manual parameter adjustment, thereby maintaining high reliability while preserving ease of operation.
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 and reliability of fill level measurements by adaptively adjusting evaluation parameters to changing conditions, reducing the risk of misidentifying echoes and improving measurement precision.
Implementation Method 1
the microwaves are guided along a waveguide in the direction of the fill substance, are reflected on the surface of the fill substance on the basis of the impedance jump existing there
Implementation Method 2
work on the basis of the travel time, measuring method and serve to determine and/or to monitor a fill level of a medium in a container
Data Source
AI summary
A method for ascertaining and monitoring fill level of a medium in a container a field device using a travel time, measuring method, wherein transmission signals are transmitted and reflection signals received. The received reflection signals are registered as echo signals in an echo function, wherein masking curve, evaluation curves and/or echo parameters of the echo signals in the echo function are ascertained or predetermined, as well as stored in a first measuring cycle. By a static echo search algorithm, through the masking curve, the evaluation curve, the echo parameters, position and/or amplitude of at least one wanted echo signal are/is ascertained, wherein, a dynamic echo search algorithm, a continuous echo tracking of positional changes and/or amplitude changes of individual echo signals and/or the wanted echo signal in the echo function is performed. On the basis of positional changes and/or amplitude changes of individual wanted echo signals, masking curve, evaluation curve and/or echo parameters of the static echo search algorithm are adjusted.