Radar Measurement Using Reflected and Transmitted Signal Components
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Solution Overview
Problem
Current radar-based measurement systems are limited in accurately characterizing measurement objects using high-frequency electromagnetic radiation, as they primarily focus on reflected signal components for distance and speed determination, neglecting the importance of transmitted components and failing to correct for measurement setup and object variations over frequency and time.
Innovation Solution
A method and system that emit FMCW or pulse-based radar signals into a measuring zone, detecting both reflected and transmitted components independently to form a measurement result, allowing for coherent amplitude and phase measurements, and using calibration values to correct for measurement setup influences, thereby improving measurement accuracy and object characterization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If only reflected signal components are evaluated for distance and speed detection, then the measurement system remains simple and focused on basic radar functions, but the ability to characterize measurement objects and detect material properties is limited
Solution Approach 1:
The radar transmission signal is used for multiple measurement purposes simultaneously: distance detection, speed detection, and material characterization. By detecting both reflected and transmitted components, the system can determine not only positional information but also physical parameters of the measurement object such as layer thickness and material properties, making the system universally applicable to diverse measurement tasks
Solution Approach 2:
The measurement system is segmented into distinct evaluation paths: reflected signal evaluation for distance and speed, and transmitted signal evaluation for material characterization. This segmentation allows each component to be optimized for its specific function while maintaining overall system versatility without excessive complexity
2Difficulty of detecting and measuring
If reflected radiation is used to determine distance between measurement object and transceiver, then distance measurement is achieved, but defects in the measurement object cannot be detected
Solution Approach 1:
The transmitted signal components act as intermediaries that provide additional information about the measurement object's internal structure. By analyzing these transmitted components, defects and material properties can be detected without compromising the distance measurement accuracy obtained from reflected components
Solution Approach 2:
The measurement approach is extended from one dimension (reflected signals for distance) to multiple dimensions by incorporating transmitted signals. This adds a new dimension of information that reveals material properties and defects while maintaining the original distance measurement capability
3Measurement precision
If measurement results are not corrected for measurement setup influences and variations, then the measurement process remains straightforward, but measurement accuracy is compromised due to setup-dependent errors and frequency variations
Solution Approach 1:
The system incorporates feedback mechanisms where calibration values obtained from reference measurements are used to correct subsequent measurements. The calibration process provides feedback information about measurement setup influences and frequency variations, enabling accurate correction of measurement results without significantly increasing process complexity
Solution Approach 2:
Calibration measurements are performed in advance to determine calibration values that compensate for measurement setup influences. This preliminary action allows the system to pre-characterize the measurement setup and use these values to correct subsequent measurements, improving accuracy before actual measurement takes place
4Measurement precision
If frequency and time resolution are not analyzed separately, then the measurement evaluation remains simple, but the ability to detect frequency-dependent phase variations and improve measurement accuracy is limited
Solution Approach 1:
The signal evaluation is segmented into frequency-domain and time-domain analyses. By separating these evaluations, the system can perform Fourier transforms to achieve frequency resolution while maintaining time resolution through gating and windowing techniques. This segmentation enables detection of frequency-dependent phase variations without overwhelming 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 precise characterization of measurement objects by accounting for both reflected and transmitted components, leading to enhanced measurement accuracy and the determination of physical parameters, such as layer thickness and material properties, with improved frequency and time resolution.
Implementation Method 1
at least one component of the radar transmission signal reflected by the measurement object
Implementation Method 2
at least one component of the radar transmission signal transmitted by the measurement object
Data Source
AI summary
The present invention relates to a method for radar-based measurement comprising an emission of a—preferably FMCW or pulse-based—radar transmission signal into a measuring zone of a measuring setup in which the measurement object can be arranged or is arranged, and detecting both at least one component of the radar transmission signal reflected by the measurement object and at least one component of the radar transmission signal transmitted by the measurement object independently of one another as radar received signals, from which a measurement result representing the radar received signals is formed.