Multi-Sensor RTLS Using Light Fixtures for Obstacle-Aware Tracking
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Solution Overview
Problem
Current real-time location systems (RTLS) face challenges in accurately and efficiently locating objects in complex environments due to limitations in signal penetration and bandwidth constraints, particularly when using radio frequency (RF) signals like BLE, which can be affected by obstacles and result in inaccurate room-level or floor-level tracking.
Innovation Solution
The system employs a network of integrated sensor devices, including light fixtures equipped with Zigbee-enabled transceivers, BLE receivers, and PIR sensors, which communicate with objects' communication devices to measure signal strength and occupancy, using algorithms to determine location and reduce communication traffic by focusing on proximity and occupancy zones, thereby enhancing accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RF signals like BLE are used for real-time location tracking, then the system can achieve real-time location capability, but the signal penetration is limited and accuracy deteriorates in complex environments with obstacles
Solution Approach 1:
The patent combines multiple sensor types (RF/BLE receivers, optical sensors, acoustic sensors, electromagnetic sensors) into integrated sensor devices. This merging allows the system to use complementary sensing modalities where optical and acoustic sensors can detect objects that RF signals cannot penetrate, thereby resolving the contradiction between maintaining real-time location capability and overcoming signal penetration limitations in complex environments.
Solution Approach 2:
The patent employs composite sensing approaches by integrating different sensor technologies that detect through different physical mechanisms. The system creates a composite detection capability where the combination of RF, optical, acoustic, and electromagnetic sensing provides more comprehensive coverage than any single sensor type, enabling reliable location tracking despite obstacles and signal attenuation.
2Reliability
If multiple sensor devices are deployed to improve location accuracy, then tracking reliability improves, but device complexity and installation requirements increase
Solution Approach 1:
The patent designs integrated sensor devices that perform multiple functions within a single unit - receiving RF signals, detecting optical presence, sensing acoustic waves, and measuring electromagnetic fields. This multi-functionality reduces the need for separate dedicated devices for each sensing modality, thereby improving tracking reliability while limiting the increase in overall system complexity.
Solution Approach 2:
The patent segments the location system into distributed integrated sensor devices that can be independently deployed throughout the environment. Each sensor device is a self-contained module with its own processing capabilities, allowing the system to achieve high tracking reliability through spatial distribution while managing complexity through modular architecture that simplifies installation and maintenance.
3Speed
If continuous signal monitoring is performed to maintain real-time location, then location updates are timely, but bandwidth consumption and power usage increase
Solution Approach 1:
The patent implements periodic sensing and selective communication rather than continuous monitoring. The integrated sensor devices perform sensing operations at appropriate intervals and only communicate location data when objects are detected or when location updates are necessary, thereby maintaining timely location information while significantly reducing bandwidth consumption and power usage compared to continuous monitoring approaches.
Solution Approach 2:
The patent employs dynamic adjustment of sensing and communication based on environmental conditions and object presence. The system adjusts its operational parameters - increasing monitoring frequency when objects are detected and reducing activity when the environment is clear - allowing the system to maintain real-time location capability when needed while minimizing energy and bandwidth consumption during low-activity periods.
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
This approach provides reliable and efficient real-time object location in various environments, improving accuracy and reducing bandwidth usage by leveraging the density of electrical devices for sensor networks and utilizing multiple communication protocols to overcome signal penetration issues.
Implementation Method 1
at least one sensor that measures at least one parameter, where the at least one parameter includes occupancy within a sensing range
Implementation Method 2
each integrated sensor device that receives the first communication signal determines a signal strength of the first communication signal
Data Source
AI summary
A system for locating an object in a volume of space can include a communication device of the object disposed in the volume of space, where the communication device broadcasts a first communication signal into the volume of space, where the first communication signal includes a first identification of the object. The system can also include multiple integrated sensor devices disposed in the volume of space, where each integrated sensor device includes at least one sensor, at least one receiver, and at least one transmitter, where the at least one receiver of a subset of the integrated sensor devices receives the first communication signal, where each of the subset determines a signal strength of the first communication signal. The system can further include at least one access controller that receives at least one second communication signal sent by the subset.