Radar Fill Level Measurement Self-Testing via Signal Superposition
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Solution Overview
Problem
Radar-based fill level measurement devices lack a reliable method for testing the functionality of their radar modules without disrupting normal operation or requiring additional measurement devices.
Innovation Solution
Incorporating a test module with a test input for a test signal and a feeding-in apparatus within the radar module's receiving channel, allowing for self-testing by superposing the test signal with the radar signal and using a mixing device to output the test frequency at an intermediate frequency, enabling continuous operation and independent testing without influencing the fill level measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a test signal is fed into the receiving channel to test the radar module functionality, then the functionality can be tested, but the normal fill level measurement operation is disrupted
Solution Approach 1:
The patent implements periodic switching between test mode and measurement mode through a switching mechanism. The test signal is fed into the receiving channel only during designated test periods, while normal radar measurements occur during measurement periods. This periodic alternation allows both testing and operation to function without permanent disruption to either.
2Reliability
If additional measurement devices are used to test the radar module, then comprehensive testing can be performed, but the device complexity increases
Solution Approach 1:
The patent combines the test signal feeding capability directly into the existing receiving channel of the radar module. The test signal input and feeding-in apparatus are integrated with the receiving channel components, allowing the same hardware path to handle both normal radar signals and test signals. This merging eliminates the need for separate external test equipment and reduces overall system complexity.
Solution Approach 2:
The receiving channel is designed with multi-functionality to handle both normal radar measurement signals and test signals. By making the receiving channel universal, it can process different types of inputs (radar echoes during measurement mode, test signals during test mode) without requiring separate dedicated test hardware, thereby reducing device complexity while maintaining comprehensive testing capability.
3Reliability
If the test signal frequency is high, then the test can be performed in the radar frequency range, but the separation between test signal and radar signal becomes difficult
Solution Approach 1:
The patent employs parameter changes by using frequency modulation to shift the test signal frequency dynamically. The test signal frequency is modulated to be distinguishable from the radar signal frequency, allowing easy separation through frequency-based signal processing. This parameter change approach enables clear differentiation between test and measurement signals without requiring complex separation mechanisms.
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
Enables reliable and simple testing of the radar module's functionality during continuous operation, ensuring error-free functioning without additional test structures or devices, allowing for simultaneous evaluation of useful and test signals in the low-frequency range.
Implementation Method 1
a mixing device and/or mixer having an intermediate frequency output... configured to output the test frequency of the test signal at the intermediate frequency output
Data Source
AI summary
An exemplary fill level measurement device comprising a radar module can be provided, along with method, computer-executable instructions and computer-readable medium. The radar module can comprise a receiving channel for receiving a radar signal reflected by a filling medium. The fill level measurement device can also comprise a test module for testing the functionality of the receiving channel. The test module can comprise a test input (for feeding in a test signal having a test frequency, and a feeding-in apparatus configured to feed at least part of the test signal into the receiving channel. The feeding-in apparatus can be configured to superpose and/or combine the test signal with the radar signal reflected by the filling medium. The receiving channel of the radar module can further comprise a mixing device having an intermediate frequency output. The mixing device can be configured to output the test frequency of the test signal at the intermediate frequency output when the receiving channel is functioning correctly.