Adaptive Power Control for Automotive Radar Sensing
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Solution Overview
Problem
Existing automotive radar systems consume high power and experience interference due to transmitting signals at maximum power levels, which is not efficient for detecting nearby objects relevant to advanced driver-assistance systems (ADAS).
Innovation Solution
An adaptive power control method for automotive radar systems that modulates the power level of transmitted radar signals based on the detected range and velocity of objects, reducing power consumption and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar systems transmit at fixed maximum power level to support detection at maximum range, then detection range is improved, but power consumption increases and inter-radar interference is elevated
Solution Approach 1:
The radar system dynamically adjusts transmit power levels based on detected object characteristics. The controller modifies power levels in real-time according to object range, size, and radar cross-section, transitioning from static maximum power transmission to adaptive power control that optimizes energy usage while maintaining detection capability.
Solution Approach 2:
The system changes the power level parameter of transmitted radar signals based on detected object parameters. By calculating appropriate power levels from object characteristics (range, size, radar cross-section), the system adjusts transmission parameters to match actual detection needs rather than operating at fixed maximum power.
2Measurement precision
If radar systems transmit at fixed maximum power level to support detection at maximum range, then detection range is improved, but inter-radar system interference is elevated
Solution Approach 1:
The radar system dynamically adjusts transmit power levels based on detected object characteristics. The controller modifies power levels in real-time according to object range, size, and radar cross-section, transitioning from static maximum power transmission to adaptive power control that optimizes energy usage while maintaining detection capability.
Solution Approach 2:
The system changes the power level parameter of transmitted radar signals based on detected object parameters. By calculating appropriate power levels from object characteristics (range, size, radar cross-section), the system adjusts transmission parameters to match actual detection needs rather than operating at fixed maximum power.
3Reliability
If radar systems transmit at fixed maximum power level, then detection capability is maintained, but efficiency is reduced for nearby objects
Solution Approach 1:
The radar system applies different power levels for different detection scenarios based on object characteristics. Instead of using uniform maximum power for all targets, the system tailors power transmission locally to each object's specific properties (range, size, radar cross-section), optimizing detection efficiency for each situation.
Solution Approach 2:
The system changes the power level parameter of transmitted radar signals based on detected object parameters. By calculating appropriate power levels from object characteristics (range, size, radar cross-section), the system adjusts transmission parameters to match actual detection needs rather than operating at fixed maximum power.
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
The adaptive power control method effectively reduces power consumption and interference by transmitting at lower power levels for nearby objects, while maintaining detection capabilities for relevant ADAS functions.
Implementation Method 1
A radar system transmits an electromagnetic signal and receives back reflections of the transmitted signal. The time delay and/or time delay variation between the transmitted and received signals can be determined and used to calculate the distance and/or the speed of objects causing the reflections, respectively.
Data Source
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AI summary
A system and method are presented. A plurality of target objects are determined by a radar system. Each target object in the plurality of target objects is associated with a distance value and a velocity value. A power reduction factor is determined using the distance value and the velocity value associated with each target object of the plurality of target objects. A second radar signal is transmitted at a second power level determined by the power reduction factor.