Radar Aliasing Direction Correction Under Axial Misalignment
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Solution Overview
Problem
Radar devices face challenges in accurately determining the direction of target objects without tracking history, especially when axial misalignment is present, leading to incorrect detection of aliasing directions.
Innovation Solution
An aliasing determination device is implemented, comprising an information acquisition section, an axial misalignment acquisition section, an aliasing calculation section, and an instantaneous determination section. This device repeatedly acquires observation point information, calculates the axial misalignment amount, determines the aliasing direction, and instantaneously corrects the observation direction to accurately reflect the actual direction of the target object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional aliasing correction techniques using tracking history are employed, then aliasing correction can be performed when prediction is available, but accurate direction determination is impossible without tracking history
Solution Approach 1:
The patent extracts the axial misalignment amount as a separate parameter that can be acquired independently of tracking history. By obtaining the axial misalignment amount through calibration or measurement processes, the system can perform aliasing correction for newly detected objects without requiring historical data, thus resolving the contradiction between measurement precision and adaptability
Solution Approach 2:
The patent performs preliminary acquisition of the axial misalignment amount through calibration processes before actual detection. This preliminary action stores the misalignment parameter that can be reused for subsequent aliasing corrections, enabling accurate direction determination without tracking history while maintaining high measurement precision
2Measurement precision
If axial misalignment is present, then the actual mounting direction deviates from the reference mounting direction, but conventional methods cannot accurately identify the true observation direction
Solution Approach 1:
The patent implements a feedback mechanism where the axial misalignment amount is used to adjust and correct the observation direction. By continuously applying the misalignment correction to the measured directions, the system reliably determines the true observation direction even when axial misalignment is present, thereby improving both measurement precision and reliability
Solution Approach 2:
The patent changes the parameter reference by introducing the axial misalignment amount as a correction parameter. Instead of using the reference mounting direction directly, the system transforms the coordinate system by applying the misalignment parameter, which enables accurate aliasing determination and observation direction identification under misaligned conditions
Data Source
AI summary
An information acquisition section repeatedly acquires observation point information including an observation direction from a radar device. An axial misalignment acquisition section acquires an axial misalignment amount of an actual mounting direction representing the actual orientation of the radar device with respect to a reference mounting direction of the radar device. An aliasing calculation section calculates an aliasing direction of the observation direction included in the observation point information. An instantaneous determination section determines, as an actual direction, one of the observation direction and the aliasing direction that is closer to the reference mounting direction, which is estimated from the axial misalignment amount and the actual mounting direction.