Radar Device Alternating Beam Patterns for Wrapped Ghost Detection
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Solution Overview
Problem
Radar devices mounted on vehicles face inaccuracies in target detection due to phase wrapping and polarized waves from objects with specific shapes, leading to erroneous detection of 'wrapped ghosts' and reduced accuracy.
Innovation Solution
A radar device that alternately transmits narrow-angle and wide-angle beams, calculates reception levels, and determines the reliability of level differences to differentiate between actual and wrapped targets, adjusting determination conditions based on the reliability of calculated level differences to improve detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If phase differences are detected in a range of 360 degrees to calculate target angles, then the radar device can detect targets in all directions, but phase wrapping occurs when reflected waves exceed 360 degrees causing erroneous detection of wrapped ghosts
Solution Approach 1:
The radar device alternately transmits first and second transmission waves with different beam patterns (narrow-beam and wide-beam modes) in periodic cycles. This periodic transmission allows the system to compare reception levels from different beam patterns to detect phase wrapping conditions and distinguish wrapped ghosts from real targets, resolving the contradiction between full 360-degree detection coverage and angle measurement accuracy.
2Measurement precision
If level differences between narrow-beam and wide-beam reception signals are used to detect wrapped ghosts, then detection accuracy improves, but polarized waves from certain target shapes reduce the reliability of level difference calculations
Solution Approach 1:
The system calculates the reliability of level differences by comparing them with reference values associated with estimate angles, and uses this reliability feedback to adjust determination conditions for wrapped ghost detection. When reliability is high, the system confidently identifies wrapped ghosts; when reliability is low (as with polarized wave targets), the system adjusts its detection thresholds to avoid false positives, thus maintaining accuracy across different target types.
3Measurement precision
If the radar device uses multiple beam patterns to improve target detection accuracy, then wrapped ghost detection improves, but the device complexity increases due to alternating transmission and multiple calculations
Solution Approach 1:
The radar device implements alternating transmission of narrow-beam and wide-beam patterns in periodic cycles, switching between the two beam patterns systematically. This periodic approach organizes the complexity into manageable cycles, allowing the processor to handle calculations in discrete steps rather than continuously, thereby reducing overall system complexity while maintaining detection accuracy.
Solution Approach 2:
The system dynamically adjusts determination conditions for wrapped ghost detection based on calculated reliability values. Rather than using fixed thresholds, the determination conditions are adaptively modified according to the reliability of level difference calculations, allowing the system to optimize performance for different target types (including those with polarized waves) without requiring complex pre-programming for every scenario.
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
Enhances the accuracy of target detection by effectively distinguishing between real targets and wrapped ghosts, even in the presence of polarized waves, thereby improving the reliability of radar systems.
Implementation Method 1
receive reflected waves of the transmission waves from targets
Implementation Method 2
receive reflected waves of the transmission waves from targets by a plurality of receiving antennae
Data Source
AI summary
There is provided a radar device that calculates an angle of a target based on a phase difference between reception signals obtained by receiving reflected waves from the target. A transmitting unit alternately transmits first and second transmission waves having different beam patterns. A calculating unit calculates reception levels of the reception signals, and an estimate angle at which the target is estimated to exist. A first determining unit determines a degree of reliability of a level difference between the reception levels, on the basis of a comparison between the level difference with a reference value which is associated with the estimate angle in advance. A second determining unit determines whether the target exists at the estimate angle, on the basis of a determination result and the reception level based on the first transmission wave.