Self-Testing Microwave Lighting Groups for False Motion Detection
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Solution Overview
Problem
Microwave sensing modules in lighting devices are prone to self-excitation due to ripple interference or environmental factors, leading to erroneous detection signals and malfunctioning of object detection functions, causing unnecessary activation even when no moving object is detected.
Innovation Solution
The lighting device incorporates a communication module, memory module, microwave sensing module, control module, and light-emitting module, with an aging table and suspect count stored in the memory module. The control module checks the aging table upon detection signals, adjusting the suspect count based on trigger records within a time window to determine the correctness of the detection, and activates or deactivates the microwave sensing module as necessary to prevent self-excitation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the microwave sensing module is used for object detection, then the lighting device can automatically activate upon detecting moving objects, but the module is prone to self-excitation due to ripple interference or environmental factors, leading to erroneous detection signals and malfunctioning
Solution Approach 1:
The system performs preliminary actions by recording trigger records in an aging table before making detection decisions. When a detection signal is received, the control module first checks the aging table to see if similar triggers occurred recently within other lighting devices. This preliminary check helps distinguish between genuine object detections and self-excitation errors before activating the lighting function.
Solution Approach 2:
The system implements feedback by using the aging table to store historical trigger records from multiple lighting devices. The control module continuously monitors and compares new detection signals against this historical feedback data. When a pattern of coordinated triggers is detected across multiple devices, it confirms genuine object detection. When triggers are isolated or inconsistent with historical patterns, it identifies self-excitation and suppresses false activation.
2Ease of operation
If the lighting device activates upon erroneous detection signals, then the object detection function appears responsive, but unnecessary activation occurs even when no moving object is detected
Solution Approach 1:
The system merges detection data from multiple lighting devices into a coordinated control strategy. The aging table stores trigger records from various devices in the same group, and the control module analyzes these combined data sources. By requiring corroboration from multiple devices before activation, the system maintains responsiveness to genuine objects while filtering out isolated false signals from single device self-excitation.
3Device complexity
If traditional microwave sensing is used without self-testing, then the device structure remains simple, but the system cannot distinguish between genuine detection signals and self-excitation
Solution Approach 1:
The system implements self-service through the self-testing mechanism where lighting devices automatically verify their own detection signals against the aging table data from other devices. The control module performs automatic cross-validation without requiring external intervention or complex additional hardware. This self-testing approach significantly improves signal verification accuracy while maintaining relatively simple device structure by utilizing the existing networked architecture.
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 self-testing mechanism accurately determines whether other lighting devices have detected a moving object, preventing erroneous activation and ensuring normal operation of the lighting system, thereby enhancing precision and reliability without significantly increasing costs.
Implementation Method 1
a microwave sensing module (13), a control module (14), and a light-emitting module (15)
Data Source
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AI summary
The present invention provides a lighting device (1) and the self-testing method thereof. The lighting device (1) includes a communication module (11), a memory module (12), a microwave sensing module (13), a control module (14), and a light-emitting module (15). The memory module (12) is connected to the communication module (11) and stores an aging table and a suspect count. The microwave sensing module (13) detects a moving object and generates a detection signal (Ds). The control module (14) is connected to the communication module (11), the microwave sensing module (13), and the memory module (12). The light-emitting module (1) is connected to the control module (14). The control module (14) checks the aging table when the microwave sensing module (13) generates the detection signal (Ds), and sets the suspect count to an initial value when determining that a preset number of the trigger records exist within a time window. The control module (14) generates the activation signal (As) to activate the light-emitting module (15), and broadcasts the activation signal (As).