Vehicle Radar Adaptive Transmission Power Control
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Solution Overview
Problem
Radar systems in motor vehicles face unnecessary energy consumption due to obstruction of the field of vision by nearby vehicles, leading to inefficient transmission power usage.
Innovation Solution
A radar device with a controller that adjusts transmission power based on the detected power level and angular orientation of reflected signals, reducing power to a minimum sufficient for object detection when the field of vision is obstructed, and utilizing inter-vehicle communication to allocate object detection functions when the shutter rate exceeds a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the radar transmits at high power to ensure sufficient detection range, then object detection capability is improved, but energy consumption increases unnecessarily when the field of vision is obstructed
Solution Approach 1:
The radar transmission power is made dynamic rather than fixed. The controller continuously monitors the detection environment and adjusts the transmission power in real-time based on actual detection needs, transforming the static power transmission mode into a dynamic adaptive mode that matches environmental conditions
Solution Approach 2:
The system implements a feedback mechanism where the controller receives information about detection conditions (such as field of vision obstruction status) and uses this feedback to adjust the transmission power accordingly. This closed-loop control ensures power is optimized based on actual detection requirements rather than operating at constant high power
Solution Approach 3:
The transmission power parameter is changed adaptively based on detection conditions. When the field of vision is obstructed or detection range is sufficient, the power parameter is reduced to minimum necessary levels, while maintaining high power only when required for distant object detection
2Device complexity
If the radar maintains fixed transmission power to simplify control, then device complexity is reduced, but energy efficiency deteriorates when field of vision is obstructed
Solution Approach 1:
The radar system performs self-adjustment of transmission power through its own controller that monitors detection conditions and autonomously optimizes power levels without requiring external intervention or complex external control systems
Solution Approach 2:
The control system transitions from a static fixed-power mode to a dynamic adaptive-power mode, where the controller automatically adjusts transmission parameters based on real-time detection environment assessment
3Length of moving object
If the radar uses high transmission power to detect distant objects, then detection range is improved, but unnecessary energy consumption occurs in close proximity scenarios
Solution Approach 1:
The transmission power parameter is dynamically changed based on target distance and detection requirements. The system uses minimum necessary power for close objects and increases power only when distant object detection is required, optimizing the power-distance relationship
Solution Approach 2:
The system applies partial action by using only the necessary portion of maximum transmission power required for each specific detection scenario, rather than consistently applying full power, thereby avoiding excessive energy consumption in scenarios where full power is not needed
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 reduces energy consumption by minimizing transmission power when the field of vision is obstructed and enables effective object detection through inter-vehicle communication, even when the radar field is partially blocked.
Implementation Method 1
a radar antenna (12) configured to detect a reflected signal (22) characterized as a reflection of a transmitted signal (20) reflected by an object (16) present in the field of view (18) of the radar antenna (12)
Data Source
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AI summary
A radar device (10) for a motor vehicle (50) includes a radar antenna (12) configured to detect a reflected signal (22) characterized as a reflection of an emitted signal (20) reflected by an object (16) present in the field of view (18) of the radar antenna (12); a controller (14) configured to emit at least one radar signal (20) from the radar antenna (12), the radar signal (20) being emitted according to a determined emission power for object (16) detection; the controller (14) being configured to detect the power level of the reflected signal (22) from the emitted radar signal (20) reflected by the detected object (16); the controller (14) being configured to adjust the emission power according to the power level of the detected reflected signal (22) to a minimum power sufficient for the detection of the detected object (16).