Radar Phase Calibration via Crosstalk Cancellation
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Solution Overview
Problem
Modern radar systems face challenges in achieving accurate phase calibration due to crosstalk, which affects the quality of angle measurements in advanced driver-assistance systems and autonomous vehicles.
Innovation Solution
A method and system for radar systems that involve determining phase values by measuring signals with and without crosstalk, using a local oscillator signal and RF output channels, where a first measurement signal represents crosstalk when the RF channel is disabled and a second measurement signal is obtained when enabled, allowing for crosstalk cancellation and precise phase determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If phase calibration is performed in radar systems, then measurement precision of angle is improved, but crosstalk degrades the quality of calibration
Solution Approach 1:
The calibration process is segmented into two distinct measurement phases: one with the RF output channel disabled to capture pure crosstalk, and another with the channel enabled to capture the combined signal. This segmentation allows separate characterization and subsequent cancellation of crosstalk effects from the actual phase measurement.
Solution Approach 2:
The crosstalk component is extracted as a separate measurable quantity by disabling the RF output channel during the first measurement. This extracted crosstalk information is then used to cancel its effect from the second measurement taken with the channel enabled, isolating the true phase characteristic.
2Measurement precision
If crosstalk cancellation is implemented, then phase measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The crosstalk characteristics are measured and stored in advance during a preliminary calibration phase when the RF output channel is disabled. This pre-acquired crosstalk data is then applied during subsequent phase measurements to cancel crosstalk effects, avoiding the need for complex real-time crosstalk suppression circuitry.
Solution Approach 2:
A processing unit acts as an intermediary that mathematically cancels crosstalk by combining measurements from two separate states (channel disabled and enabled). This software-based intermediary approach avoids adding complex hardware cancellation circuits while achieving the desired crosstalk compensation.
Data Source
AI summary
A method for the use in a radar system is described herein. In accordance with one embodiment, the method includes providing a local oscillator signal to an RF output channel of a radar system. The RF output channel is configured to generate, in an enabled state, an RF output signal based on the local oscillator signal. The method further includes determining a first measurement signal based on the local oscillator signal and a first representation of the RF output signal, while the RF output channel is disabled, and thus the first measurement signal represents crosstalk. Further, the method includes determining a second measurement signal based on the local oscillator signal and a second representation of the RF output signal while the RF output channel is enabled. A phase value associated with the RF output channel is determined based on the first measurement signal and the second measurement signal.