Distance Sensor Test Device Doppler Signature Simulation
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Solution Overview
Problem
Current testing devices for distance sensors using electromagnetic waves struggle to simulate complex Doppler signatures, which are essential for analyzing the motion profiles of reflecting objects with multiple radial motion components, such as pedestrians or bicycles, limiting their ability to accurately test future sensors that will analyze more intricate Doppler patterns.
Innovation Solution
A testing device and method that incorporate a signal-processing unit to modulate a predeterminable Doppler signature onto the sampled signal or delayed sampled signal, converting it into a simulated reflected signal, allowing for the simulation of complex motion profiles by using digital signal processing techniques, including orthogonal signal component manipulation and modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If current testing devices use conventional signal processing methods, then the device complexity is low, but the ability to simulate complex Doppler signatures is limited
Solution Approach 1:
The patent replaces conventional analog signal processing methods with digital signal processing. The signal processing unit digitally modulates the sampled receive signal with Doppler signatures, substituting complex analog modulation hardware with flexible digital processing. This allows simulation of complex motion profiles through software algorithms rather than mechanical or analog circuitry, resolving the contradiction between simulation capability and device complexity.
Solution Approach 2:
The patent changes the processing domain from analog to digital, enabling parameter manipulation of Doppler signatures through digital modulation. By converting the receive signal to digital form and applying digital modulation with configurable Doppler signatures, the system can simulate various motion patterns (pedestrian, bicycle, complex trajectories) by changing digital parameters rather than reconfiguring hardware, thus improving adaptability without proportionally increasing device complexity.
2Adaptability or versatility
If digital signal processing is used to simulate complex motion profiles, then the adaptability improves, but the processing time increases
Solution Approach 1:
The patent performs preliminary digital conversion of the receive signal to digital form, allowing subsequent rapid digital modulation operations. By pre-converting to digital domain and preparing the signal processing pipeline, the system enables fast application of different Doppler signatures without requiring time-consuming analog reconfiguration. The signal processing unit can quickly switch between different motion profile simulations by applying pre-programmed digital modulation algorithms.
3Measurement precision
If conventional testing devices are used, then the ease of operation is maintained, but the measurement precision for complex Doppler patterns is insufficient
Solution Approach 1:
The patent substitutes analog signal analysis with digital signal processing for Doppler pattern analysis. The signal processing unit digitally modulates and analyzes the sampled signal, enabling precise measurement of complex Doppler patterns through digital algorithms. This digital approach provides superior measurement precision for intricate motion patterns while maintaining ease of operation through automated digital processing and standardized interfaces.
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 the simulation of complex Doppler signatures, facilitating the testing of distance sensors that can analyze intricate motion patterns, improving the accuracy and flexibility of testing devices by leveraging digital signal processing for minimal latency and ease of implementation.
Implementation Method 1
a receiving element (3) for receiving an electromagnetic free-space wave as a receive signal
Implementation Method 2
a radiating element (4) for radiating an electromagnetic output signal
Implementation Method 3
the sampled signal is delayed by a signal-processing unit (5) to form a delayed sampled signal using a settable time delay
Implementation Method 4
the reflected signals are frequency-shifted with respect to the frequency of the transmit signal from the distance sensor due to the Doppler effect
Data Source
AI summary
A testing device for testing a distance sensor includes: a receiver for receiving an electromagnetic free-space wave as a receive signal; an analog-to-digital converter configured to, in a simulation mode, convert the receive signal into a sampled signal; a signal-processing unit configured to: delay the sampled signal or a modulated sampled signal to form a delayed sampled signal or a modulated delayed sampled signal; and modulate, upon the sampled signal or upon the delayed sampled signal, a predeterminable Doppler signature as a characteristic motion profile of a reflecting object to be simulated to form the modulated sampled signal or the modulated delayed sample signal; a digital-to-analog converter configured to convert the modulated or the modulated delayed sampled signal into a simulated reflected signal; and a transmitter configured to radiate the simulated reflected signal or a simulated reflected signal derived from the simulated reflected signal as an output signal.