Variable Transmission Power for Radar Level Measurement
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Solution Overview
Problem
Existing level measurement technologies face challenges in accurately determining fill levels due to signal amplitude issues, where low amplitudes result in poor measurement quality and high amplitudes lead to overdriving, especially in environments with attenuated or poorly reflective products.
Innovation Solution
An electronic module for level measurement that adjusts transmission power by switching between different signal power levels using a high-frequency amplifier and signal switches, allowing for up to 30dB amplification change without requiring multiple oscillators, and includes a damping element for further power reduction, ensuring energy efficiency and maintaining signal shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transmission power is increased to improve signal strength for poor measurement quality, then measurement quality improves, but the receiving unit overdrives and measurement becomes incorrect
Solution Approach 1:
The patent implements dynamic adjustment of transmission power by switching between at least two different transmission power levels based on measurement conditions. The control unit monitors signal characteristics and adaptively changes the transmission power to maintain optimal measurement quality without causing receiver overdrive, thus resolving the contradiction between measurement quality and measurement correctness.
Solution Approach 2:
The patent changes the transmission power parameter dynamically during operation. By switching between different power levels (e.g., high power for distant targets, low power for close targets), the system maintains the received signal within the optimal dynamic range of the receiver, preventing both poor quality and overdrive conditions.
2Reliability
If transmission power is decreased to avoid receiver overdrive, then measurement correctness improves, but measurement quality deteriorates due to weak signals
Solution Approach 1:
The system dynamically adjusts transmission power based on real-time feedback about signal strength and target distance. When the target is far away or signal path loss is high, the system increases transmission power to maintain adequate signal strength for accurate measurement, while preventing receiver overdrive through intelligent control.
Solution Approach 2:
The control unit uses feedback from the receiving unit about signal strength and quality to adjust transmission power. This closed-loop control ensures that transmission power is optimized for each measurement scenario, maintaining both measurement correctness and quality.
3Adaptability or versatility
If multiple oscillators with different power levels are used to achieve variable transmission power, then transmission power control capability improves, but device complexity increases
Solution Approach 1:
The patent combines a single oscillator with a high-frequency amplifier and switching network to generate multiple transmission power levels. This merging approach replaces what would otherwise require multiple separate oscillators, reducing device complexity while maintaining the capability to provide at least two different transmission power levels for adaptive measurement.
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 solution enables precise and adaptive control of transmission power, improving measurement accuracy by maintaining signal quality across varying conditions, reducing energy consumption, and avoiding input/output adjustments, thus enhancing the reliability of fill level measurements.
Implementation Method 1
The electronics module has a source for generating the transmission signal, a high-frequency amplifier for amplifying the transmission power of the transmission signal
Implementation Method 2
a first signal switch for switching the transmission signal from a first transmission power to a second transmission power after it has been generated by the source
Implementation Method 3
According to a further example, the electronics module also has a second signal switch, which switches and is controlled in parallel with the first signal switch. According to a further example, the electronics module has a first bypass line for bypassing the high-frequency amplifier
Data Source
Figure 1A~1B
Figure 1C~3
Figure 4~5
AI summary
According to one embodiment of the invention, the transmission power of a level radar is changed by switching the transmission power from a first transmission power to a second transmission power using a signal switch. This switching is achieved, for example, by bypassing the high-frequency amplifier or by switching off a drain voltage.