RF Motion Detection Envelopes for Vehicle False Alarm Reduction
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Solution Overview
Problem
Motion detectors using RF waves often trigger false alarms due to detection of non-target objects such as insects, rodents, and people not considered intruders, leading to unnecessary notifications or alarms.
Innovation Solution
A motion detection system comprising an RF transmission circuit, an RF reception circuit, and a controller that generates detection envelopes to differentiate between objects based on distance and type, activating appropriate indicators such as alarms or pre-alarms based on the magnitude and duration of detected motion within specific detection envelopes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the motion detector uses RF waves to sense motion of objects, then the detection capability is improved, but false alarms are triggered by non-target objects such as insects, rodents, and people not considered intruders
Solution Approach 1:
The detection area is segmented into multiple detection envelopes with different alarm thresholds and response levels. The controller creates multiple detection envelopes, each with different characteristics for triggering alarms. This allows the system to differentiate between objects at different distances and positions, reducing false alarms from non-target objects while maintaining detection capability.
Solution Approach 2:
Different regions of the detection area are assigned different qualities or sensitivity levels. The controller times the generation of control signals to create detection envelopes that have different alarm thresholds for different spatial zones. This local differentiation allows the system to be more sensitive to intruders in critical areas while being less sensitive to non-target objects in other areas.
2Speed
If the motion detector triggers an alarm for any detected motion, then the response speed is improved, but unnecessary notifications are generated by people walking past the vehicle or the owner approaching too close
Solution Approach 1:
The system performs preliminary classification of detected objects by determining which detection envelope the motion falls into before triggering an alarm. The controller times control signals to create multiple detection envelopes with different characteristics, allowing preliminary identification of whether the detected object is a potential intruder or a non-target object before generating a notification.
Solution Approach 2:
The system changes the parameters of detection sensitivity and alarm threshold based on the detected object's position and characteristics. By creating multiple detection envelopes with different alarm thresholds, the system dynamically adjusts its response parameters to match the detected object, ensuring rapid response to intruders while avoiding unnecessary notifications for non-target objects.
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
Reduces false alarms by accurately distinguishing between relevant and irrelevant motion, ensuring that only intended alerts are triggered, enhancing the reliability of surveillance systems.
Implementation Method 1
the motion detector transmits an RF wave and receives a reflected RF wave from the object
Implementation Method 2
The controller is further configured to control the RF reception circuit to generate a Doppler signal indicative of a distance between the first object and the motion detector based on the reflected RF signal
Data Source
AI summary
A device for responding to movement in or around a vehicle. In one example, the device comprises a radio frequency (RF) transmission circuit, a radio frequency (RF) transmission circuit, and a controller that is electrically coupled to the RF transmission circuit and RF reception circuit. The controller times the generation of control signals to create detection envelopes. The controller also determines motion within the detection envelopes, and generates an output based on the detection envelope that motion was determined within.