Multi-Radar Foreign Object Detection via Network Synchronization
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Solution Overview
Problem
Existing foreign object detection systems using radars face challenges in detecting objects on runways due to interference between radars, which can result in false images and inaccurate positioning of detected objects.
Innovation Solution
A foreign object detection system employing multiple radars connected via a network, where the signal source controls the delay time between radars to differentiate and suppress interference, ensuring accurate detection by adjusting the synchronization signal timing to prevent false image occurrences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radars are used to detect foreign objects, then detection coverage and capability are improved, but interference between radars causes false images and positioning errors
Solution Approach 1:
The system performs preliminary synchronization by transmitting synchronization signals to multiple radars before actual detection operations. This preliminary timing alignment ensures that radar signals are transmitted and received in a coordinated manner, preventing interference between different radars and eliminating false images in the detection results.
Solution Approach 2:
The system incorporates feedback mechanisms where the control unit receives timing information from each radar and adjusts the transmission timing accordingly. This feedback loop allows the system to dynamically coordinate radar operations and maintain precise timing relationships, ensuring accurate foreign object detection without interference.
2Productivity
If radar signals are transmitted simultaneously from multiple radars, then detection efficiency is improved, but interference waves create false images
Solution Approach 1:
The system employs periodic transmission of synchronization signals to coordinate radar operations. By using periodic timing references, multiple radars can operate in a coordinated manner that maintains detection efficiency while preventing interference. The periodic synchronization ensures that radar pulses are transmitted at appropriate intervals without creating overlapping interference waves.
3Adaptability or versatility
If the position of reflective objects is used for detection, then detection capability is improved, but interference from multiple radars creates false reflective objects
Solution Approach 1:
The control unit performs preliminary timing coordination by transmitting synchronization signals to all radars before detection operations. This preliminary action establishes a unified timing reference that prevents interference waves from creating false reflective object detections. The synchronized timing ensures that only actual foreign objects are detected and recorded.
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 system effectively prevents radar interference by controlling signal arrival times, allowing for precise detection of foreign objects on runways and reducing false image recognition, thereby enhancing the accuracy and reliability of the detection process.
Implementation Method 1
a signal source 31 that transmits a synchronization signal to the first radar 11 and the second radar 21 via the network 33
Implementation Method 2
a first radar 11, a second radar 21... for detecting a foreign object 35
Implementation Method 3
when a radar signal output from the second radar 21 is reflected by a reflective object 37 and input to the first radar 11
Implementation Method 4
Assume that τ1i denotes time for transmitting the synchronization signal from the signal source 31 to the first radar 11, and τ2j denotes time for transmitting the synchronization signal from the signal source 31 to the second radar 21
Data Source
AI summary
To provide a foreign-object system which uses a plurality of radars, and which can detect a foreign object that is present on a runway or the like and which can suppress interference between radars. A foreign-object detection system including a first radar 11, a second radar 21 connected to the first radar via a network 33, and a signal source 31 for transmitting a synchronization signal to the first radar and the second radar via the network, said foreign-object detection system wherein interference generated due to a radar signal outputted from the second radar being reflected by a reflective body and inputted to the first radar is prevented by controlling a delay time that corresponds to |τ1i−τ2j|, where τ1i is the time taken for the synchronization signal to be transmitted from the signal source to the first radar, and τ2j is the time taken for the synchronization signal to be transmitted from the signal source to the second radar.