FMCW Radar Distance and Flow Speed Measurement
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Solution Overview
Problem
Existing measurement devices require separate systems for determining the distance and flow speed of a medium, which can be inefficient and require multiple measurements, whereas the proposed solution integrates a frequency-modulated transmission signal to simultaneously determine both distance and flow speed using a single measurement cycle.
Innovation Solution
A measurement device equipped with an FMCW module generating a frequency-modulated transmission signal with rising and falling frequency ramps, and an antenna arrangement that emits the signal in two directions, allowing for the simultaneous determination of distance and flow speed by evaluating the reflected signal, with the processor unit calculating these parameters within a single measurement cycle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate measurement systems are used for distance and flow speed determination, then measurement reliability is improved, but device complexity increases and measurement time increases
Solution Approach 1:
The patent combines distance measurement and flow speed measurement into a single integrated measurement system that uses one transmission signal for both purposes. The FMCW radar system simultaneously extracts distance information from the time delay of the reflected signal and flow speed information from the Doppler frequency shift, eliminating the need for separate measurement systems and reducing overall device complexity while maintaining measurement reliability.
Solution Approach 2:
The transmission signal serves multiple functions simultaneously: it enables both distance determination and flow speed determination. The single FMCW radar system performs dual measurement tasks by processing different characteristics of the reflected signal, making the measurement system universal and multi-functional rather than requiring specialized separate systems for each measurement type.
2Measurement precision
If separate measurement systems are used for distance and flow speed determination, then measurement precision is improved, but loss of time increases
Solution Approach 1:
The measurement system operates continuously with a single transmission signal that simultaneously provides data for both distance and flow speed measurements. By processing the reflected signal to extract both time delay and Doppler shift information in parallel, the system achieves continuous measurement of both parameters without requiring sequential measurements, thereby eliminating time loss while maintaining precision.
Solution Approach 2:
The patent merges distance measurement and flow speed measurement into a single simultaneous measurement process. The FMCW radar system processes the reflected signal to obtain both measurement results in one operation, eliminating the need for separate measurement cycles and reducing total measurement time while preserving the precision of both measurements through proper signal processing.
3Device complexity
If a single frequency-modulated transmission signal is used for both distance and flow speed determination, then device complexity is reduced, but measurement precision may deteriorate
Solution Approach 1:
The patent segments the processing of the reflected signal into distinct analysis paths: one path extracts distance information from the time delay characteristic while another path extracts flow speed information from the Doppler frequency shift. This segmentation of signal processing ensures that each measurement parameter is analyzed independently with appropriate processing techniques, maintaining high precision for both measurements even though a single transmission signal is used.
Solution Approach 2:
The system utilizes different parameters of the reflected signal for different measurement purposes: time delay parameter for distance determination and Doppler frequency shift parameter for flow speed determination. By changing the analysis parameter extracted from the signal rather than using separate physical measurement systems, the patent maintains measurement precision while reducing device complexity.
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 enables efficient and accurate simultaneous measurement of distance and flow speed, reducing the need for multiple measurement systems and cycles, while allowing for flexible emission directions and evaluation frequencies based on specific conditions.
Implementation Method 1
an FMCW module (101) for generating a frequency-modulated transmission signal which has a rising and a falling frequency ramp
Implementation Method 2
by evaluating the transmission signal reflected by the medium and received by the antenna arrangement
Implementation Method 3
the flow speed is determined by Doppler evaluation of a constant transmission signal
Data Source
AI summary
A fill level measurement device is specified for determining distance of the measurement device and flow speed of a medium, which comprises a frequency-modulated transmission signal having a rising and a falling frequency ramp. The flow speed of the medium can be determined by the Doppler effect arising from the flow speed of the medium.