Passenger Radar Blockage Detection Using Zero-Doppler Signals
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Solution Overview
Problem
Radar sensors in vehicles face challenges in detecting passengers and pets due to blockages caused by changes in the interior environment, leading to reduced target detection rates and errors.
Innovation Solution
A passenger detection radar system that utilizes a signal processing unit to analyze ADC data, generate range Doppler maps, and employ first and second detection units to identify normalized power rate and power blockage, generating a warning alarm when blockage is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radar sensor is used to detect passengers in a vehicle, then passenger detection capability is improved, but detection accuracy deteriorates when blockages are present in the interior environment
Solution Approach 1:
The system performs preliminary blockage detection before passenger detection by analyzing zero-Doppler signals and normalized power rates. This preliminary action identifies potential blockages in the radar path, allowing the system to take corrective measures before attempting passenger detection, thereby preventing detection errors caused by blockages.
Solution Approach 2:
The system continuously monitors the radar signal environment and provides feedback about blockage conditions. By detecting changes in the interior environment and identifying blockages through signal analysis, the system can adjust its detection parameters or alert the user, ensuring that passenger detection accuracy is maintained despite the presence of blockages.
2Adaptability or versatility
If the vehicle interior environment is modified with additional components, then functional versatility is improved, but radar signal propagation is deteriorated due to blockages
Solution Approach 1:
The system converts the harmful effect of blockages into useful information for detection. By analyzing the reflected signals from blockages (zero-Doppler signals), the system identifies the presence and location of blockages, transforming what was previously a mere obstruction into a detectable signal that enables the system to compensate for the blockage effect.
Solution Approach 2:
The system introduces an intermediary detection mechanism that analyzes signal characteristics to identify blockages. This intermediary layer of signal analysis acts as a mediator between the radar transmission and the final detection process, allowing the system to detect and account for blockages caused by interior modifications without preventing the modifications themselves.
3Reliability
If blockage detection is added to the radar system, then detection reliability is improved, but system complexity increases
Solution Approach 1:
The blockage detection functionality is integrated into the existing radar system's signal processing units, allowing the same hardware to serve multiple purposes: passenger detection, blockage detection, and environmental monitoring. This multi-functionality approach improves detection reliability without proportionally increasing system complexity, as no entirely separate detection system is required.
Solution Approach 2:
The system detects blockages by analyzing changes in signal parameters, specifically normalized power rates and zero-Doppler signal characteristics. By using parameter analysis rather than additional physical sensors or complex hardware, the system can improve detection reliability through software-based detection methods that leverage existing hardware capabilities.
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
Improves blockage detection accuracy, reduces detection errors, and enhances passenger detection rates by identifying and alerting drivers to blockages that interfere with radar signals.
Implementation Method 1
A radar sensor refers to a detection device for measuring distance, speed, and angle information by transmitting microwaves and receiving some reflection signals reflected from a target
Implementation Method 2
the radar sensor basically detects a target and detects vital signal information based on Doppler frequency characteristics of vital signals including respiration and heart rates
Data Source
AI summary
Provided are a passenger detection radar system and a blockage detection method therefor. The passenger detection radar system includes: a signal processing unit for receiving ADC data, which is received through radar reception channels, and performing signal processing; an RDM data unit for generating and storing RDM data based on a signal subjected to the signal processing; a first detection unit for detecting NPR blockage based on an NPR by detecting a zero Doppler signal in which a Doppler frequency has a value of zero; a second detection unit for detecting power blockage by detecting a power of the zero Doppler signal; and a blockage determination unit for making a final determination whether blockage has occurred based on detection results of the first and second detection units, and generating a control signal to generate a warning alarm upon determining presence of the blockage.