Radar Temperature Gain Control for Faster Low-Power Startup
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Solution Overview
Problem
Conventional radar chips face challenges with power drops due to temperature changes, leading to signal strength loss and potential regulatory compliance issues, especially since they lack automatic gain control (AGC) and require halting operations for gain control calibration.
Innovation Solution
The implementation of a method for junction temperature measurement and temperature gain control on a radar unit, which uses a target junction temperature as a set point instead of a fixed time heat-up mode, and employs ambient temperature sensing to account for environmental temperature changes, thereby reducing start-up times and enabling low power modes while maintaining regulatory compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional radar chips operate without automatic gain control to reduce device complexity, then device complexity is reduced, but signal strength stability deteriorates due to power drops from temperature changes
Solution Approach 1:
The patent changes the operating parameters of the radar chip by dynamically adjusting the gain state based on temperature conditions. The system monitors temperature and selects appropriate gain states from a predefined set to compensate for temperature-induced power drops, thereby maintaining signal strength stability without requiring complex automatic gain control circuitry.
Solution Approach 2:
The patent implements a feedback mechanism where the temperature of the radar chip is continuously monitored and used to determine the appropriate gain state. This feedback loop allows the system to adapt to temperature changes and maintain compliant signal strength without the need for complex real-time automatic gain control hardware.
2Stability of the object's composition
If conventional radar chips perform gain control calibration to maintain signal strength stability, then signal strength stability is improved, but productivity deteriorates due to halting operations for calibration
Solution Approach 1:
The patent performs gain control calibration in advance during the manufacturing process, establishing a mapping between temperature conditions and appropriate gain states. This preliminary calibration eliminates the need for real-time calibration operations, allowing the radar chip to maintain signal strength stability throughout its operational life without halting productivity.
3Device complexity
If conventional radar chips use fixed time heat-up mode to reach operating temperature, then temperature management is simplified, but start-up time increases and low power modes cannot be utilized
Solution Approach 1:
The patent transitions from a static fixed-time heat-up approach to a dynamic temperature-based control mechanism. The system continuously monitors the radar chip's temperature and dynamically adjusts its operation, enabling early transition to low-power modes when temperature conditions permit and reducing overall start-up time while maintaining compliance.
4Reliability
If conventional radar chips operate in high-power mode to ensure signal strength compliance, then regulatory compliance is maintained, but energy consumption increases
Solution Approach 1:
The patent changes the power consumption parameter dynamically based on temperature conditions. By monitoring temperature and selecting appropriate gain states from a predefined set, the system maintains regulatory compliance when necessary while transitioning to lower power consumption states when temperature conditions allow, thereby optimizing energy usage without sacrificing reliability.
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 reduces start-up times for radar chips, allowing them to operate in low-power states for longer periods, improves signal strength stability, and ensures regulatory compliance by accurately managing temperature and gain control without the need for frequent recalibrations.
Implementation Method 1
uses radar to detect movement within a detection zone to identify a respiratory waveform of a user. Monitoring devices can use radar sensors to detect the range, velocity, and identity of objects in motion.
Implementation Method 2
a temperature sensing unit of the radar unit and configured to determine an internal operating temperature of the radar unit
Implementation Method 3
causing the radar unit to operate in a first mode associated with heating the radar unit
Data Source
AI summary
Technologies for temperature gain control on radar units are described. A method includes determining a first value for an internal operating temperature corresponding to a steady-state of a radar unit. The method further includes causing the radar unit to operate in a first mode that heats the radar unit. The method further includes obtaining a second value for the internal operating temperature at a first time in the first mode and determining a third value indicating a measurement bias associated with the radar unit. The method further includes determining a fourth value using the second value and the third value. The fourth value indicates an updated internal operating temperature of the radar unit. The method further includes determining that the fourth value satisfies a threshold temperature condition corresponding to the first value. The method further includes causing the radar unit to stop operating in the first mode.