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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →A real-time location system (RTLS) is a wireless system that estimates the position of tagged items within a defined area at or near real time. It uses radio-link measurements from tags and receiving infrastructure, then makes the resulting location information available to software. RTLS is a system capability, not a single radio technology or consumer device.
What is a real-time location system?
The IEC summary of ISO/IEC 24730-1:2006 defines RTLS as wireless systems able to locate an item in a defined space at a point in time that is real time or close to it. The standard describes position as derived from physical properties of the radio link between a transmitter and receiving infrastructure. IEC’s summary of ISO/IEC 24730-1:2006 also describes an API purpose: enabling software applications to locate assets with RTLS transmitters attached.
The phrase does not promise a particular accuracy, update rate, coverage area, or radio technology. Those depend on the system’s standard and design, the receiving infrastructure, and the environment where it operates.
How does RTLS work?
- Associate a tag with an asset. A transmitter or tag is attached to, carried by, or otherwise associated with the item to be located.
- Receive the tag’s radio signals. Fixed readers or other infrastructure collect signals from the tag within the deployment area.
- Estimate its position. A location engine analyzes radio measurements, such as signal strength, signal arrival time, differences in arrival time, or arrival angle.
- Provide location data to software. Applications can use the location information through RTLS infrastructure and its software interfaces.
These measurements can support different location methods. An ISO/IEC 24730-22:2012 preview lists time of arrival or time-of-flight ranging, received-signal-strength triangulation, time difference of arrival (TDoA), and angle of arrival (AoA) as examples.
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Is RTLS the same as RFID?
No. RTLS estimates an item’s location within a defined area using radio measurements; not every system that detects an item is continuously locating it. The ISO/IEC 24730-22:2012 preview distinguishes event-based passage detection and homing-beacon approaches as methods that are “really RFID rather than RTLS.” A checkpoint that registers a tag when it passes a reader can report that event without estimating the item’s changing position between checkpoints.
What technologies and standards can RTLS use?
RTLS refers to a system function, not a specific air interface. The ISO/IEC 24730 series includes standards for radio interfaces and for software access to RTLS infrastructure. These examples illustrate differences in design; they are not a ranking of technologies for every site.
Rank #2
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| Example | What the cited standard describes |
|---|---|
| 2.4 GHz DSSS | The IEC summary of ISO/IEC 24730-2:2006 describes a networked system for controlled areas such as warehouses, campuses, or airports. It specifies approximate location with frequent updates—for example, several times a minute—and accuracy of 3 m or less for that described system. This is not a general RTLS guarantee. IEC summary of ISO/IEC 24730-2:2006 |
| UWB, low-rate mode | ISO/IEC 24730-61:2013 defines one-directional simplex communication between readers and tags, intended for low-data-rate connectivity with very limited battery-consumption requirements. ISO reports this edition was reviewed and confirmed in 2024 and remains current. ISO/IEC 24730-61:2013 |
| UWB, high-rate mode | ISO/IEC 24730-62:2013 describes one-way TDoA blink communication and optional two-way ranging. Its mandatory default operational mode is intended to support interoperability between tags and infrastructure from different manufacturers. IEC record for ISO/IEC 24730-62:2013 |
| Software API | ISO/IEC 24730-1 describes software access to RTLS infrastructure for locating assets with attached transmitters. IEC record for ISO/IEC 24730-1:2014 |
What should you evaluate in an RTLS deployment?
Start with the location task, then check whether the proposed system and infrastructure can meet it under the conditions where it will be used. Useful comparison points include:
Quick Recap
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- Required granularity and update frequency: Decide how precisely and how often the application needs an item’s location.
- Environment and coverage: Establish whether the area is indoors, outdoors, or mixed, and what receiving infrastructure must be installed.
- Tag power and scale: Account for the number of tagged items and their battery or power constraints.
- Location method and air interface: Identify the method used to estimate position and the applicable radio standard.
- Integration and interoperability: Determine how location data reaches organizational applications and what compatibility is supported between tags and infrastructure.
- Accuracy in the actual site: Ask whether stated performance applies to the intended deployment conditions, rather than assuming a standard’s example or a vendor figure transfers to every environment.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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