UWB versus BLE voor RTLS: wanneer sub-meter nauwkeurigheid daadwerkelijk belangrijk is.

Twee technologieën domineren tegenwoordig de enterprise RTLS voor binnenpositionering: UWB en BLE 5.x met richtingaanwijzing. Beide werken. Beide hebben betrouwbare leveranciers.

De beslissing gaat bijna nooit over wat "beter" is — het gaat erom wat geschikt is voor wat je probeert te doen, en met welk budget. (Heb je haast? Onze Technologie-picker geeft een leveranciersneutrale aanbeveling in vier vragen.)

Wat je van elk krijgt

UWB (Ultra-Wideband, IEEE 802.15.4z, FiRa -certified). Uses time-of-flight ranging across multiple anchors. Typical accuracy 10–30 cm in een goed ontworpen inzet.

De latentie is laag (onder de 100 ms). Multipath-veerkrachtig. Momenteel de enige standaardradio die op grote schaal een binnennauwkeurigheid onder een meter haalt.

BLE 5.x met AoA (Aankomsthoek). Gebruikt multi-element antennearrays op de locator om de koers van een zender te bepalen. Typische nauwkeurigheid 1–3 m. De standaard BLE zonder AoA is uitsluitend RSSI-geschikt en biedt 3–10 m kamerhoogte — niet hetzelfde product.

De prijs van de extra nauwkeurigheid

Going from BLE - AoA to UWB roughly triples per-square-metre infrastructure cost. The numbers vary by environment, but as a working rule of thumb across our recent deployments:

• BLE 5.x AoA : one locator per 200–400 m², ~€200–€500 per locator, €20–€30 per tag.
• UWB: één anker per 50–120 m², €400–€1.000 per anker, €40–€80 per tag.

Voeg dan kabels, PoE-switches, kalibratietijd en de technische uren toe voor de juiste ankerplaatsing. UWB is overal de duurdere oplossing.

Wanneer sub-meter nauwkeurigheid daadwerkelijk uitmaakt

Het eerlijke antwoord is: Minder vaak dan leveranciers suggereren. Use cases where you need UWB -grade precision:

• Traceerbaarheid per tool-on-job. Welk koppelgereedschap zit op welk onderdeel en welke leiding? Werkprocessen met overlappende werkgebieden vereisen discriminatie op bay-niveau.
• Anti-collision for AGV / AMR. Robotveiligheidszones tolereren geen onzekerheid van 2 meter.
• FOD-preventie in de lucht- en ruimtevaart. "Gereedschap voor het laatst gezien bij een vliegtuig" is een ander probleem dan "gereedschap voor het laatst gezien in hangar."
• Atletenvolging. Trainingsbelastinganalyse vereist een echte biomechanica-niveau locatie.
• Tracking van waardevolle activa in gedeelde ruimtes. Twee infusiepompen op aangrenzende bedden moeten van elkaar te onderscheiden zijn, niet alleen "in dezelfde afdeling."
• Procesautomatisering vergrendelt. Een actie activeren wanneer een asset een specifieke machine-envelop binnenkomt.

Wanneer BLE 5.x het juiste antwoord is

• Werkstromen op kamerniveau of zoneniveau. "Pomp is in SEH-afdeling 7" is genoeg om de workflow van verpleegkundige oproepen te sturen.
• Bezetting en hot-desking. 1–3 miljoen is uitstekend voor hybride werkplekanalyse.
• Wegwijzering voor personeel en bezoekers. Telefoongebaseerde RTLS met BLE-infrastructuur schaalt prachtig.
• Grote landgoederen. Als je 50.000 m² vloeroppervlak moet bestrijken, doen BLE-economie-werk en UWB-economie dat vaak niet.
• Batterijlevenskritieke tags. BLE-tags lopen routinematig 3–5 jaar op een muntcel.

Het hybride patroon

De meeste van onze grotere programma's zijn niet all- UWB of all- BLE. Ze zijn BLE - AoA over het brede vloeroppervlak, met UWB-infrastructuur overheen in enkele hoogprecisiezones — assemblagecellen, OR's, dispensarium, robotbanen.

Tags zijn ofwel dual-radio of, vaker, verschillende populaties tags per zone.

This hybrid pattern is cheaper than all- UWB and more useful than all- BLE. It's also where having a vendor-neutral architecture pays back: most large RTLS vendors push you toward whichever radio they make.

Nog een variabele: waar de analyses zich bevinden

Increasingly the decision isn't about the radio at all but about the analytics layer downstream. UWB platforms tend to bundle proprietary engines that are excellent for visualisation but harder to integrate. BLE - AoA platforms have tended toward more open APIs.

Vraag de leverancier: "Als we het positie-event in onze eigen datapijplijn willen invoeren, kunnen we dat dan?" Als het antwoord is "ja, via REST of MQTT in een gedocumenteerd schema," zal die leverancier meeschalen met jouw programma.

Als het antwoord is "je kunt ons dashboard gebruiken," dan is dat niet zo.

Snelle beslissingsboom

1. Moet je twee activa binnen 1 meter van elkaar onderscheiden? → UWB.
2. Moet je een proces- of veiligheidsvergrendeling besturen? → UWB.
3. Is jouw gebied > 20.000 m² met een vast budget? → BLE.
4. Is je nauwkeurigheidseis "welke kamer / welke bay"? → BLE.
5. Heb je beide nodig in verschillende zones? → hybride — dat is meestal het antwoord.

Wil je hulp bij het uitvoeren van deze beslissing tegen je echte omgeving? TRACIO technologieselectieprojecten omvatten site-survey RF-modellering en TCO onder beide architecturen.

Two technologies dominate enterprise RTLS for indoor positioning today: UWB and BLE 5.x with direction-finding. Both work. Both have credible vendors.

The decision is almost never about which is "better" — it's about which is appropriate for what you're trying to do, at what budget. (In a hurry? Our technology picker gives a leveranciersneutraal recommendation in four questions.)

What you get from each

UWB (Ultra-Wideband, IEEE 802.15.4z, FiRa-certified). Uses time-of-flight ranging across multiple anchors. Typical accuracy 10–30 cm in a well-designed deployment.

Latency is low (sub-100 ms). Multi-path resilient. Currently the only commodity radio that hits sub-metre indoor accuracy at scale.

BLE 5.x with AoA (Angle-of-Arrival). Uses multi-element antenna arrays on the locator to determine the bearing of a transmitter. Typical accuracy 1–3 m. Standard BLE without AoA is RSSI-only and gives 3–10 m room-level — not the same product.

The price of the extra accuracy

Going from BLE-AoA to UWB roughly triples per-square-metre infrastructure cost. The numbers vary by environment, but as a working rule of thumb across our recent deployments:

• BLE 5.x AoA: one locator per 200–400 m², ~€200–€500 per locator, €20–€30 per tag.
• UWB: one anchor per 50–120 m², €400–€1,000 per anchor, €40–€80 per tag.

Then add cabling, PoE switches, calibration time, and the engineering hours for proper anchor placement. UWB is the more expensive answer everywhere.

When sub-metre accuracy actually matters

The honest answer is: less often than vendors imply. Use cases where you need UWB-grade precision:

• Tool-on-job traceability. Which torque tool is on which part on which line? Workflows with overlapping work envelopes need bay-level discrimination.
• Anti-collision for AGV/AMR. Robot safety zones don't tolerate 2 m uncertainty.
• FOD prevention in aerospace. "Tool last seen near aircraft" is a different problem to "tool last seen in hangar."
• Athlete tracking. Training-load analytics need true biomechanics-grade location.
• High-value asset tracking in shared spaces. Two infusion pumps on adjacent beds need to be distinguishable from each other, not just "in the same ward."
• Process automation interlocks. Triggering an action when an asset enters a specific machine envelope.

When BLE 5.x is the right answer

• Room-level or zone-level workflows. "Pump is in ED bay 7" is enough to drive nurse-call workflow.
• Occupancy and hot-desking. 1–3 m is excellent for hybrid-workplace analytics.
• Wayfinding for staff and visitors. Phone-based RTLS using BLE infrastructure scales beautifully.
• Large estates. If you need to cover 50,000 m² of floor space, BLE economics work and UWB economics often don't.
• Battery-life-critical tags. BLE tags routinely run 3–5 years on a coin cell.

The hybrid pattern

Most of our larger programmes are not all-UWB or all-BLE. They are BLE-AoA across the broad floor area, with UWB infrastructure overlaid in a few high-precision zones — assembly cells, ORs, dispensary, robot lanes.

Tags either dual-radio or, more commonly, distinct populations of tags per zone.

This hybrid pattern is cheaper than all-UWB and more useful than all-BLE. It's also where having a leveranciersneutraal architecture pays back: most large RTLS vendors push you toward whichever radio they make.

One more variable: where the analytics live

Increasingly the decision isn't about the radio at all but about the analytics layer downstream. UWB platforms tend to bundle proprietary engines that are excellent for visualisation but harder to integrate. BLE-AoA platforms have tended toward more open APIs.

Ask the vendor: "If we wanted to feed the position event into our own data pipeline, can we?" If the answer is "yes, via REST or MQTT in a documented schema," that vendor will scale with your programme. If the answer is "you can use our dashboard," it will not.

Quick decision tree

1. Do you need to distinguish two assets within 1 m of each other? → UWB.
2. Do you need to drive a process / safety interlock? → UWB.
3. Is your area > 20,000 m² with a flat budget? → BLE.
4. Is your accuracy requirement "which room / which bay"? → BLE.
5. Do you need both at different zones? → Hybrid — that's the answer most often.

Want help running this decision against your actual environment? TRACIO technology-selection engagements include site-survey RF modelling and TCO under both architectures.