Automotive Radar Phase Error Compensation via Reference Angular Position
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Solution Overview
Problem
Existing automotive radar systems face challenges in accurately determining the direction of arrival of radar signals due to phase errors caused by manufacturing variations, temperature changes, and aging, which cannot be fully compensated by calibration methods, leading to errors in angular detection and increased design and test costs.
Innovation Solution
An automotive radar arrangement that includes a radar receiver, a radar signal processor, a communication interface, and a determiner to correct radar reception data by using reference angular positions of objects, allowing for closed-loop compensation of phase and power errors, thereby enhancing the accuracy of object detection and reducing side lobes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration-based compensation is used to correct phase errors in radar receiver, then angular detection accuracy is improved, but device complexity and test costs increase due to need for non-volatile memory or fuses
Solution Approach 1:
The patent replaces hardware-based calibration storage (non-volatile memory or fuses) with a software-based lookup table stored in volatile memory. The compensation values are pre-calculated and stored in a table structure that can be easily updated without hardware modifications, thus reducing device complexity while maintaining angular detection accuracy.
Solution Approach 2:
The patent changes the storage medium from non-volatile memory/fuses to volatile memory, and organizes calibration data as a lookup table with configurable parameters. This allows the same compensation functionality to be achieved with simpler hardware while maintaining the ability to correct phase errors across different operating conditions.
2Measurement precision
If calibration-based compensation is used to correct phase errors in radar receiver, then angular detection accuracy is improved, but manufacturing costs increase due to additional test requirements
Solution Approach 1:
The patent replaces complex hardware calibration storage with a software-based lookup table approach, eliminating the need for expensive non-volatile memory or fuse components and their associated testing procedures. This significantly reduces manufacturing costs while maintaining the ability to perform calibration-based compensation.
Solution Approach 2:
The patent creates a digital copy of calibration data in the form of a lookup table that can be stored in volatile memory. This digital representation allows for easier manufacturing and testing compared to hardware-based calibration storage, as the same compensation values can be replicated software-wise without additional hardware testing.
3Measurement precision
If calibration-based compensation is used to correct phase errors in radar receiver, then angular detection accuracy is improved, but functional safety is compromised due to inability to compensate entire drifts
Solution Approach 1:
The patent implements a dynamic calibration approach where the lookup table can be configured with multiple sets of compensation values for different operating conditions (temperatures, frequencies). The system can select and switch between different calibration sets based on current conditions, enabling compensation of drifts that static calibration cannot handle, thus improving functional safety.
Solution Approach 2:
The patent pre-calculates and stores multiple sets of compensation values for different operating conditions in the lookup table. This preliminary preparation allows the system to quickly switch to appropriate compensation values when conditions change, enabling proactive compensation of drifts before they affect measurement accuracy, thereby improving functional safety.
Data Source
AI summary
An automotive radar arrangement includes a radar receiver configured to generate radar reception data from radio signals received by a plurality of radar receive antennas. A radar signal processor is configured to determine an estimate of an angular position of at least one object by processing the radar reception data. A communication interface is configured to receive information about a reference angular position of the at least one object. A determiner is configured to determine a compensation for the radar reception data based on the estimate of the angular position and the reference angular position of the at least one object. The radar signal processor is configured to correct the radar reception data and/or further radar reception data for the detection of a further object based on the compensation. An output interface is configured to provide information about the presence of the further object to a vehicle controller.