Vehicle Radar Multipath Ghost Suppression
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Solution Overview
Problem
Existing vehicle radar systems face challenges in accurately distinguishing between actual target objects and multipath ghosts, particularly when multipath ghosts are generated by stationary objects, leading to erroneous detections and potential unnecessary operations during high-speed travel.
Innovation Solution
The vehicle radar apparatus employs a method to select a relay reflection target object from detected targets, sets a multipath ghost condition based on the position and velocity of the relay reflection target object and the own vehicle, and restricts the output of detection results to external apparatuses, thereby identifying and suppressing erroneous multipath ghost detections without requiring the identification of a reflection point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the radar apparatus detects all target objects without discrimination, then the quantity of detected objects increases, but the reliability of detection results deteriorates due to multipath ghost errors
Solution Approach 1:
The invention extracts and removes multipath ghost objects from the set of detected target objects by comparing detection results across multiple radar antennas. Each antenna independently detects target objects, and objects detected by multiple antennas are identified as multipath ghosts and excluded from the final detection results, thereby maintaining high reliability while preserving detection of genuine single-object targets
Solution Approach 2:
The system uses feedback from multiple radar antenna detections to validate and filter target objects. By comparing detection results from different antennas and using the detection status from one antenna as feedback for others, the system reliably identifies and eliminates multipath ghosts while maintaining accurate detection of real targets
2Measurement precision
If the radar apparatus performs frequency analysis on all received signals, then the measurement precision of target objects increases, but the loss of time for processing increases
Solution Approach 1:
The radar apparatus performs preliminary frequency analysis on signals from the first antenna before receiving signals from subsequent antennas. This preliminary action allows the system to establish initial detection results that can be used for comparison and filtering, reducing the need for extensive re-processing of all signals while maintaining measurement precision through the multi-antenna verification process
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 simplifies the determination of multipath ghosts, allowing for accurate identification even during high-speed travel, reduces the risk of erroneous operations, and maintains detection accuracy for moving bodies essential for traveling assistance.
Implementation Method 1
detects a target object in a vicinity of an own vehicle by transmitting a radar wave to the vicinity of the own vehicle, receiving a reflected wave of the radar wave, and performing frequency analysis on transmission and reception signals
Implementation Method 2
selects, as a relay reflection target object, a moving body that is capable of relaying transmission and reception of the radar wave to and from another target object
Data Source
AI summary
A vehicle radar apparatus detects a position and a velocity of a target object. The radar apparatus selects, as a relay reflection target object, a moving body capable of relaying transmission and reception of the radar wave to and from another target object, from target objects detected. The radar apparatus sets a multipath ghost condition indicating the position and the velocity of the target object erroneously detected as a result of a stationary object to which the radar wave is relayed by the relay reflection target object, based on the position and the velocity of the relay reflection target object and the velocity of an own vehicle. The radar apparatus extracts a target object that meets the multipath ghost condition from the detected target objects, determines that the extracted target object is a multipath ghost, and restricts output of a detection result from the radar apparatus to an external apparatus.