What are indoor positioning systems?

Indoor positioning systems (IPS) are networks designed to locate individuals within indoor environments where traditional Global Positioning System (GPS) technology fails to provide accuracy. A study published in IEEE Communication Surveys & Tutorials notes, “An IPS should work all the time unless the user turns off the system, offer updated position information of the target, estimate positions within a maximum time delay, and cover the expected area the users require to use an IPS.” Unlike GPS, which relies on satellite signals, IPS uses a range of technologies like WiFi and Bluetooth to achieve precise positioning. 

How indoor positioning systems work

1. IPS uses a network of stationary beacons and mobile tags to track locations indoors.
2. Stationary beacons, also known as anchors, are placed at fixed points within the environment.
3. Mobile tags, attached to objects or individuals, transmit signals to nearby beacons.
4. The beacons receive these signals and calculate the distance from the tag based on signal strength or time of flight.
5. The location data from multiple beacons is sent to a central server for processing.
6. The server uses algorithms to triangulate the precise location of the mobile tag within the indoor space.
7. Different technologies can be used for signal transmission.
8. IPS can achieve high accuracy, often down to a few centimeters, depending on the technology and installation.
9. The system can provide real-time tracking information that can be displayed on mobile devices or dashboards.

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Types of indoor positioning technology

The forms of indoor positioning often used in healthcare include: 

• Wi-Fi-based positioning: Utilizes existing Wi-Fi networks to determine the location of devices and individuals within healthcare facilities.
• Bluetooth low energy (BLE) beacons: Employ small battery-operated devices that transmit signals to nearby smartphones or tags, enabling precise location tracking.
• Ultra-wideband (UWB): Provides high-accuracy location tracking by measuring the time it takes for radio signals to travel between devices.
• Infrared sensors: Uses infrared light to detect the presence and movement of individuals or objects in specific areas.
• Ultrasound technology: Employs sound waves to determine the location of devices by measuring the time it takes for sound signals to travel between transmitters and receivers.
• Magnetic field mapping: Leverages variations in the Earth's magnetic field within buildings to track the location of devices.
• Radio frequency identification: Uses radio waves to automatically identify and track tags attached to objects or individuals within a facility.
• Vision-based systems: Utilizes cameras and image processing algorithms to track movements and locations of people or assets in real-time.
• Hybrid systems: Combines multiple technologies (e.g., Wi-Fi, BLE, UWB) to enhance accuracy and reliability in tracking within complex environments.

The application of indoor positioning systems 

IPS can be integrated into healthcare communications through HIPAA compliant email. For example when a patient is moved from one area to another, like from the emergency room to a hospital room, an automated email notification can be sent to relevant staff members. It acts as a way for all team members to remain aware of the patient's location and status. 

Data collected from IPS can also be analyzed and summarized in reports sent via email to management teams. This helps them make informed choices about resource allocation and operational improvements. 

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FAQs

What is a patient tracking system?

A patient tracking system is a technology that monitors and manages the location and status of patients within a healthcare facility.

What technologies are used in patient tracking systems?

Common technologies include Radio Frequency Identification (RFID), Bluetooth Low Energy (BLE), Wi-Fi, and GPS for real-time location tracking.

Can patient tracking systems be integrated with existing hospital information systems?

Yes, these systems can integrate with electronic health records (EHR) and other hospital management software.