Vehicle Radar Transmit Beam Agnostic Calibration
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Solution Overview
Problem
Current vehicle radar systems face challenges in efficient testing and calibration due to the intricate nature of radar systems and the need for precise calibration, particularly in beamforming applications.
Innovation Solution
The proposed solution involves transmit beam agnostic radar calibration techniques that decouple transmit beamforming from receive calibration, enabling efficient processing and scaling of radars. This is achieved by triggering each transmit antenna element to transmit electromagnetic energy according to a first transmit beam pattern, generating data representing a collection pattern, synthesizing a second transmit beam pattern, estimating a mutual coupling matrix, and generating a model for operating the radar onboard a vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional radar calibration methods are used to ensure precise beamforming calibration, then measurement precision is improved, but loss of time increases due to the intricate nature of radar systems and the need for separate calibration of each transmit beam pattern
Solution Approach 1:
The calibration process is segmented into two independent parts: (1) receiving calibration that is common to all transmit beam patterns, and (2) transmit beamforming that is specific to each pattern. By separating these functions, the patent enables parallel processing where multiple transmit beam patterns can be calibrated simultaneously using the same receive calibration data, dramatically reducing total calibration time while maintaining precision.
Solution Approach 2:
The patent performs receive calibration in advance as a preliminary action that can be reused across multiple transmit beam patterns. By completing the receive calibration portion first and storing it for later use, the system avoids repeating time-consuming calibration measurements for each new transmit beam pattern, thereby reducing overall calibration time without sacrificing measurement precision.
2Reliability
If comprehensive calibration of multiple transmit beam patterns is performed to improve reliability, then device complexity increases due to the need for separate calibration procedures for each beam pattern
Solution Approach 1:
The patent creates a universal receive calibration process that serves multiple transmit beam patterns simultaneously. The receive calibration data obtained from a single procedure can be applied across different transmit beam configurations, making the calibration system multi-functional and reducing complexity. This universal approach maintains reliability by ensuring consistent calibration across all beam patterns without requiring separate complex calibration procedures for each one.
3Manufacturing precision
If traditional sequential calibration methods are used to maintain manufacturing precision, then productivity decreases because each transmit beam pattern requires separate calibration processing
Solution Approach 1:
By segmenting the calibration into receive calibration (common to all beams) and transmit beamforming (specific to each beam), the patent enables parallel processing of multiple transmit beam patterns. This segmentation allows the system to maintain precise beamforming calibration while dramatically increasing productivity through simultaneous processing of multiple beam configurations using the shared receive calibration data.
Solution Approach 2:
The patent creates a reusable receive calibration model that can be copied and applied across multiple transmit beam patterns. Instead of performing separate complete calibrations for each beam pattern, the system generates one receive calibration model and copies its application to multiple transmit configurations, maintaining manufacturing precision while exponentially increasing calibration throughput.
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 approach allows for accelerated testing and calibration of radars, reducing the time required for calibration and enabling the radar to transmit and receive electromagnetic energy according to various beam patterns, thereby improving the accuracy and reliability of vehicle radar systems.
Implementation Method 1
The vehicle radar system transmits a radio signal from a transmitter, which then bounces off nearby objects and returns to a receiver
Implementation Method 2
A radar adjusts the phase of the transmitted signals from each antenna element within an antenna array to electronically steer the direction and shape of the radar beam without requiring any physical movement of the antennas
Implementation Method 3
By carefully controlling the phases and amplitudes of these signals, the radar system can use constructive and destructive interference to create the desired beam direction and shape
Data Source
Figure 1
Figure 2A~2B
Figure 2C~2D
AI summary
Example embodiments relate to techniques and systems for transmit beam agnostic radar calibration. A computing system can transmit each transmit antenna element of a radar to individually transmit electromagnetic energy according to a first transmit beam pattern and generate data representing a collection pattern based on reflections of the electromagnetic energy transmitted according to the first transmit beam pattern. The computing system can also synthesize, using the data representing the collection pattern, a second transmit beam pattern that differs from the first transmit beam pattern and estimate a mutual coupling matrix for processing reflections of electromagnetic energy transmitted according to the second transmit beam pattern. The computing system can then generate, by the computing system and based on the mutual coupling matrix, a model for operating the radar onboard a vehicle. The model can enable a vehicle radar system having one or more radars that match the radar to transmit and receive electromagnetic energy according to the first transmit beam pattern and the second transmit beam pattern.