Automotive Radar Coordination via Dynamic Resource Multiplexing
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Solution Overview
Problem
The increasing deployment of radar units in vehicles leads to mutual interference, affecting timing estimation and object detection, and the need for longer propagation ranges in autonomous vehicles results in higher transmission power, potentially harming pedestrians.
Innovation Solution
The implementation of a radar unit with a resource manager, beacon detector, interference detector, and resource hopper to dynamically manage radar resource allocation, perform frequency and time multiplexing, and adjust transmission power based on pedestrian presence, thereby mitigating interference and ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If radar transmission power is increased to extend propagation range for autonomous vehicles, then detection range is improved, but harmful radiation exposure to pedestrians increases
Solution Approach 1:
The radar system dynamically adjusts transmission power based on detected pedestrian presence and distance. When pedestrians are detected in the radar beam path, the system reduces power to safe levels; when no pedestrians are present, it operates at higher power to maximize detection range. This dynamic adaptation resolves the contradiction between extended range and pedestrian safety.
Solution Approach 2:
The system changes the transmission power parameter in response to environmental conditions. By monitoring for pedestrians and adjusting the power parameter accordingly, the system achieves both long detection range (when safe) and pedestrian protection (when needed), directly addressing the technical contradiction.
2Adaptability or versatility
If multiple radar units are deployed in vehicles for advanced driver-assistance systems, then detection coverage and safety features are improved, but mutual interference between radar units increases
Solution Approach 1:
The radar system segments the time-frequency resource space by implementing orthogonal chirp sequences with unique time-frequency signatures for each radar unit. This segmentation allows multiple radars to operate simultaneously without mutual interference, preserving timing estimation accuracy while maintaining expanded detection coverage.
Solution Approach 2:
The patent introduces an intermediary coordination mechanism where radar units exchange beacon signals and coordination data. This intermediary communication layer enables radars to identify and avoid interfering with each other's transmissions, maintaining both multi-radar coverage benefits and timing estimation reliability.
3Productivity
If radar units operate simultaneously in the same frequency band, then resource utilization is improved, but interference and detection accuracy deteriorate
Solution Approach 1:
The system implements periodic time-division multiplexing where radar units transmit in alternating time slots or frames. This periodic structure allows multiple radars to share the frequency band efficiently while preventing simultaneous transmissions that would cause interference, thus maintaining both high resource utilization and detection accuracy.
Solution Approach 2:
The radar system dynamically allocates time-frequency resources based on detected interference levels and detection requirements. When interference is detected, the system adjusts transmission timing and frequency selection in real-time, optimizing both resource utilization and detection precision adaptively.
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 solution effectively reduces radar interference, enhances detection accuracy, and minimizes radiation exposure to pedestrians by optimizing radar resource usage and adjusting transmission power dynamically.
Implementation Method 1
radar units transmit a radiofrequency (RF) signal via an antenna in a particular direction and receive echoes that are reflected off of objects in the radar range
Implementation Method 2
a resource multiplexer to perform time multiplexing and frequency multiplexing
Implementation Method 3
a resource multiplexer to perform time multiplexing and frequency multiplexing
Implementation Method 4
a resource hopper to perform frequency hopping and time hopping
Implementation Method 5
a resource hopper to perform frequency hopping and time hopping
Data Source
AI summary
Methods, apparatus, systems and articles of manufacture to manage automotive radar coordination are disclosed. An example apparatus includes a resource manager to retrieve radar unit requirements, the radar unit requirements including at least one of a unit ID, current time information, vehicle position, and radar resource requirements, a resource multiplexer to perform at least one of time multiplexing and frequency multiplexing according to the radar resource requirements, and a resource hopper to at least perform one of frequency hopping and time hopping in response to detecting an amount of interference from other vehicles that exceeds an interference threshold.