Dual-Frequency Radar Modules for Pedestrian Detection Stability
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Solution Overview
Problem
Conventional radar systems face challenges in stably detecting targets with many dominant scattering points, such as pedestrians, due to multipath fading issues in millimeter-wave bands, where the human body acts as a complex scattering body with multiple scattering points, leading to reduced reflection intensity and difficulty in maintaining detection stability.
Innovation Solution
The radar apparatus employs two radar modules operating on different frequency bands, with overlapping main beam directivity, to utilize frequency diversity and suppress fading variations through signal processing, ensuring stable detection of targets with many scattering points by combining outputs from the first and second radar modules, which use distinct frequency channels to enhance signal-to-noise ratio and distance resolving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single radar module operates in millimeter-wave band to detect targets, then the angular resolution and detection capability are improved, but the detection stability deteriorates due to multipath fading when targets have many scattering points
Solution Approach 1:
The radar system is divided into multiple radar modules (first radar module and second radar module), each operating in different frequency bands. This segmentation allows the system to process signals from multiple frequency channels independently and combine them, thereby reducing the impact of multipath fading on detection stability while maintaining high angular resolution capability
Solution Approach 2:
The invention changes the frequency band parameter by operating multiple radar modules at different frequencies (e.g., first module at 76-77GHz, second module at 78-79GHz). This parameter variation enables frequency diversity, where signals experiencing fading at one frequency may be received strongly at another, thus improving overall detection stability
2Reliability
If multiple radar modules operate in different frequency bands, then the frequency diversity gain and detection stability are improved, but the device complexity increases
Solution Approach 1:
The invention merges the outputs of multiple radar modules operating in different frequency bands through signal processing. By combining the detection results from the first and second radar modules, the system achieves frequency diversity gain and improved detection stability while managing the complexity through integrated processing architecture
3Reliability
If the main beam directivity of multiple radar modules overlaps, then the frequency diversity gain is enhanced, but the interference between modules increases
Solution Approach 1:
The invention changes the frequency band parameter for each radar module to operate at different frequencies (e.g., first module at 76-77GHz, second module at 78-79GHz). This frequency separation reduces mutual interference between modules while their main beam directivities overlap in space, enabling effective frequency diversity gain
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 allows for stable detection of targets with many dominant scattering points, such as pedestrians, by achieving a high frequency diversity gain and suppressing fading variations, enabling accurate detection even at varying distances and reducing interference with other radar systems.
Implementation Method 1
a first radar transmitter and receiver which transmits a radio-frequency first radar transmission signal generated using a prescribed first transmission code sequence and the first carrier wave
Implementation Method 2
which receives a first radar reflection signal produced as a result of reflection of the first radar transmission signal by a target
Implementation Method 3
a second radar transmitter and receiver which transmits a radio-frequency second radar transmission signal generated using a prescribed second transmission code sequence and the second carrier wave
Implementation Method 4
which receives a second radar reflection signal produced as a result of reflection of the second radar transmission signal by a target
Data Source
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AI summary
First and second radar modules include channel controllers which set different frequency bands for first and second carrier waves, respectively, and first radar transmitter and receiver which transmit radio-frequency first and second radar transmission signals generated using prescribed first and second transmission code sequences and the first and second carrier waves, which receive first and second radar reflection signals produced as a result of reflection of the first and second radar transmission signals by a target, and which convert them into baseband first and second reception signals. A signal processor performs prescribed combining processing on outputs of the first and second radar modules. The first and second radar transmission signals partially overlap with each other in main beam directivity.