Vehicle Alarm Device Multipath Ghost Detection Suppression
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Solution Overview
Problem
Conventional alarm devices for vehicles often erroneously detect 'ghost' vehicles due to multipath reflections from adjacent vehicles or buildings, leading to degraded usability.
Innovation Solution
An alarm device with dual millimeter-wave radar units and a control unit that suppresses alarms for secondary detected vehicles when distance, speed, and time differences between the primary and secondary vehicles are within predetermined limits, preventing false detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radar detection is used to detect approaching vehicles, then the alarm device can notify drivers of approaching vehicles, but multipath reflections from adjacent vehicles or walls cause erroneous detection of ghost vehicles
Solution Approach 1:
The patent combines detection results from multiple radar units (first and second detection units) to cross-validate approaching vehicles. By merging detection data and comparing parameters such as distance, speed, and azimuth, the system can identify and eliminate ghost vehicle detections caused by multipath reflections, thereby improving detection reliability
Solution Approach 2:
The control unit continuously monitors detection results from multiple radar units and uses feedback mechanisms to suppress alarm activation when ghost vehicles are detected. The system compares detection parameters in real-time and adjusts alarm activation based on the consistency of detection data, reducing erroneous alarms while maintaining reliable detection of real approaching vehicles
2Ease of operation
If the alarm activates for every detected vehicle, then all approaching vehicles are notified, but false alarms reduce usability when ghost vehicles are detected
Solution Approach 1:
The control unit performs preliminary analysis of detection data before activating the alarm. By pre-comparing parameters such as distance, speed, and azimuth from multiple radar units, the system determines whether a detected vehicle is real or a ghost vehicle before triggering the alarm, thereby maintaining high usability by avoiding false alarms
Solution Approach 2:
The system changes the decision parameters for alarm activation by requiring consistency across multiple detection parameters (distance, speed, azimuth) from multiple radar units. This multi-parameter verification approach filters out ghost vehicle detections while maintaining sensitivity to real approaching vehicles, improving both usability and detection accuracy
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
The solution effectively reduces erroneous detections, enhancing the device's usability by accurately differentiating between real and ghost vehicles.
Implementation Method 1
a first detection unit configured to detect another vehicle approaching from the back right of a self-vehicle; a second detection unit configured to detect another vehicle approaching from the back left of the self-vehicle
Implementation Method 2
due to a multipath reflected from another vehicle or a wall
Data Source
AI summary
A control unit of an alarm device suppresses the activation of an alarm for a second another vehicle when a self-vehicle is reversing from a parked state, in a case where after one of a first detection unit, which is configured to detect another vehicle approaching from the back right of the self-vehicle, or the second detection unit, which is configured to detect another vehicle approaching from the back left of the self-vehicle, detects a first another vehicle, another one of the first detection unit or the second detection unit detects the second another vehicle, in a case where a distance difference between a first distance between the first another vehicle and the self-vehicle and a second distance between the second another vehicle and the self-vehicle is less than or equal to a predetermined distance, in a case where a speed difference between a first speed of the first another vehicle and a second speed of the second another vehicle is less than or equal to a predetermined speed, or in a case where a time difference between a first estimated crossing time of the first another vehicle and the self-vehicle and a second estimated crossing time of the second another vehicle and the self-vehicle is less than or equal to a predetermined time.