Motion-Triggered RF Identification for Low-Power Monitoring
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Solution Overview
Problem
Existing monitoring systems for identifying individuals in a monitored site, such as elderly or disabled persons, face challenges in accurately detecting presence and movement while minimizing power consumption and reducing false alarms, especially in environments with multiple individuals and potential intrusions.
Innovation Solution
A system comprising motion sensors, RF receivers, and processors that transmit a wireless request message upon detection, enabling identification devices to send unique signals only when requested, reducing power consumption and enhancing battery life by limiting transmission to necessary areas and using low-power transmitters and receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If continuous transmission of identification signals is implemented, then identification accuracy is improved, but power consumption increases
Solution Approach 1:
The identification device transmits unique identification signals periodically rather than continuously. The system receives these periodic signals and correlates them with motion detection events to identify individuals, achieving both power savings and accurate identification.
Solution Approach 2:
The system uses motion sensors to detect presence and then requests identification signals only when needed. This on-demand approach allows the identification device to remain in low-power mode most of the time while still providing accurate identification when motion is detected.
2Measurement precision
If motion sensors continuously monitor all spaces, then detection accuracy is improved, but false alarms increase
Solution Approach 1:
The system uses feedback from motion sensors to trigger requests for identification signals. When motion is detected in a monitored space, the system requests and receives a unique identification signal to confirm whether the motion corresponds to a person of interest, thereby reducing false alarms while maintaining detection accuracy.
3Reliability
If RF receivers are deployed throughout the site, then signal capture reliability is improved, but system complexity increases
Solution Approach 1:
The monitored site is divided into multiple monitored spaces, each with its own motion sensor. RF receivers are strategically positioned to cover overlapping areas, creating a segmented monitoring approach that improves signal capture reliability while managing system complexity through modular deployment.
4Reliability
If identification devices transmit signals frequently, then identification reliability is improved, but battery life decreases
Solution Approach 1:
Identification devices transmit unique identification signals periodically rather than continuously. This periodic transmission approach maintains identification reliability by providing signals at regular intervals while significantly extending battery life by keeping the transmitter in low-power mode between transmissions.
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
Accurately identifies individuals and reduces power consumption, extending battery life and minimizing false alarms by limiting signal transmission to specific areas, thus improving monitoring efficiency and reducing maintenance needs.
Implementation Method 1
A plurality of motion sensors each monitoring one of a plurality of monitored spaces of a monitored site
Implementation Method 2
A plurality of RF receivers, each having a reception coverage area overlapping with a respective one of the plurality of monitored spaces
Implementation Method 3
One or more transmitters adapted for transmitting a wireless request message
Data Source
AI summary
A system of identifying a person's identity in a monitored site, comprising communication interface(s) for communicating with motion sensor(s) each monitoring one of a plurality of monitored spaces of a monitored site, RF receiver(s), each having a reception coverage area overlapping with one of the monitored spaces and transmitter(s) for transmitting a request message, a program store storing a code and processor(s) for executing code to, receive from a detecting sensor a presence indication in a detecting space of the monitored spaces, instruct the transmitter(s) to transmit a request message in the monitored site following the indication reception and estimate an identity of a person by analyzing a unique identification signal captured by RF receiver(s) having reception coverage area that overlaps with the detecting space. The unique identification signal is transmitted by an identification device of an associated person in response to the request message reception.