Radar Angular Error Estimation Through Movement Loci
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Solution Overview
Problem
Existing radar systems face reduced accuracy in estimating angular error as vehicles recede from stationary objects due to minimal changes in horizontal angles and relative speeds, leading to inaccuracies in angular error estimation.
Innovation Solution
An angular error estimation device that calculates moving direction indication values and averages them for each observation angle, using a reference movement locus to determine angular errors, thereby improving accuracy by excluding unreliable data points and employing interpolation for continuous sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If radar systems use traditional angular error estimation methods based on horizontal angles and relative speeds, then the system structure remains simple, but the measurement precision deteriorates when vehicles recede from stationary objects
Solution Approach 1:
The patent transforms the estimation approach by changing the parameters used: instead of relying solely on horizontal angles and relative speeds, it introduces moving direction indication values derived from movement locus information. This parameter transformation enables accurate angular error estimation even when vehicles recede from stationary objects, resolving the measurement precision issue without requiring complex additional hardware
Solution Approach 2:
The patent introduces an intermediary calculation process that uses movement locus information as a mediator between the radar detection data and the final angular error estimation. By calculating moving direction indication values from movement locus and using these as an intermediate step, the system achieves more accurate angular error estimation while maintaining a manageable system structure
2Area of stationary object
If the radar device observes stationary objects at lateral positions, then the detection area is expanded, but the angular error estimation accuracy deteriorates due to minimal changes in observation parameters
Solution Approach 1:
The patent adds another dimension to the estimation process by incorporating movement locus information and calculating moving direction indication values. This dimensional addition to the estimation approach enables accurate angular error measurement in the lateral detection area where traditional methods fail due to minimal parameter changes
Data Source
AI summary
An angular error estimation device calculates, for detected stationary objects, a moving direction indication value indicating a moving direction of a stationary object viewed from a movable body assuming that the movable body is traveling in a straight line, for each observation angle at which a radar device has observed the stationary object, based on object detection information and movement locus information. The device classifies moving direction indication values for each observation angle and calculates, as a moving direction average value, an average value of the moving direction indication values classified by the observation angle for each observation angle. The device calculates the angular error for each observation angle based on an average movement locus calculated based on the moving direction average values for each observation angle and a reference movement locus set as a movement locus of the stationary object in a case where there is no angular error.