Radar Phase Calibration for Temperature and Voltage Dependency
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Solution Overview
Problem
Radar systems face challenges in calibrating phase shifts due to temperature and supply voltage variations in monolithic microwave integrated circuits (MMICs), which affect the accuracy of HF signal processing, especially in high-frequency bands where phase stability is crucial for reliable measurements.
Innovation Solution
A method and system for ascertaining calibration data by measuring phase values at different temperature and supply voltage conditions, using a local oscillator signal and a phase measurement circuit to generate calibration data that compensate for phase changes in HF output signals, thereby maintaining phase stability across temperature and voltage variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase calibration is performed without considering temperature and supply voltage variations, then the calibration process is simple and quick, but the measurement precision and reliability of the radar system deteriorate due to phase shifts
Solution Approach 1:
The patent performs phase calibration measurements at different temperature and supply voltage conditions in advance to determine calibration data before actual radar operation. This preliminary characterization of phase shifts under varying conditions allows the system to compensate for temperature and voltage effects during normal operation without requiring complex real-time adjustments.
Solution Approach 2:
The patent introduces an intermediary calibration data structure that captures the relationship between temperature/voltage conditions and phase shifts. This calibration data acts as a mediator between the physical environmental variations and the radar signal processing, enabling accurate phase compensation without directly controlling temperature or voltage during operation.
2Reliability
If phase calibration accounts for temperature and supply voltage dependency, then the reliability of radar measurements improves, but the calibration process becomes more complex and time-consuming
Solution Approach 1:
The comprehensive phase calibration accounting for temperature and supply voltage variations is performed once during manufacturing or initial setup. This preliminary action captures all expected environmental variations, allowing the radar system to operate reliably throughout its service life without requiring repeated time-consuming calibrations under different conditions.
Solution Approach 2:
The patent systematically varies temperature and supply voltage parameters during calibration to map their effects on phase shifts. By characterizing the full range of expected parameter variations in advance, the system achieves high reliability across all operating conditions while keeping the actual calibration time limited to the initial characterization phase.
3Measurement precision
If comprehensive phase calibration under varying temperature and voltage conditions is performed, then the accuracy of distance, speed, and direction-of-arrival measurements improves, but the manufacturing and setup process becomes more complex
Solution Approach 1:
The patent uses calibration data as an intermediary that encapsulates the complex relationships between temperature, voltage, and phase shifts. This calibration data can be stored in lookup tables or mathematical models, simplifying the manufacturing process while still enabling accurate compensation during operation. The complex characterization is performed once during manufacturing, and the results are stored for efficient retrieval during use.
Solution Approach 2:
The patent creates a simplified digital representation (calibration data) that copies the essential characteristics of phase shifts under various temperature and voltage conditions. This digital copy allows the system to achieve accurate compensation without requiring the physical complexity of controlling or measuring temperature and voltage in real-time during operation.
Data Source
AI summary
According to a first example implementation, the method comprises providing a local oscillator signal in a first radar chip based on a local oscillator signal generated in a further radar chip; supplying the local oscillator signal to a transmission channel of the first radar chip which, based on the local oscillator signal, generates an HF output signal; changing the temperature and/or supply voltage of the first radar chip; measuring phase values based on the local oscillator signal supplied to the transmission channel and of the corresponding HF output signal for different temperature values and/or for different supply voltage values of the first radar chip; and ascertaining calibration data based on the measured phase values for a phase calibration to compensate for changes in the phase of the HF output signal resulting from a change in the temperature and/or in the supply voltage.