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Welcome to the next generation localization systems

Sequitur is a Real Time Locating System (RTLS) capable of high 3D tracking accuracy (centimeter-level) thanks to the adoption of the UWB technology.

A set of fixed nodes, called anchors, is positioned in the monitored area as reference to localize mobile nodes, called tags.

Sequitur allows localization and communication in harsh environments, such as industrial contexts. It works outdoor and indoor (where GPS in unavailable). Different types of tags can be carried by persons, machines, robots, drones or objects to track them in real time.

Sequitur at a glance
Sequitur Family

Depending on the application, Sequitur offers different architectures:

Sequitur InGPS
TWR
InGPS-TWR-big
Decentralized TWR

Position estimation: in tag

Tag form factor: industrial tag for machines, external battery pack or power supply

Tag energy efficiency: typical 1 day (10Ah 5V battery pack)

Tags: Unlimited – Limited tag density

Refresh Rate: up to 20 Hz, scales with number of tags

Network infrastructure (anchors): not needed

Central unit: not needed. Available for centralized tags’ monitoring and management (WiFi)

Sequitur InGPS
TDOA
InGPS-TDOA-big
Decentralized TDOA

Position estimation: in tag

Tag form factor: industrial tag for machines, external battery pack or power supply

Tag energy efficiency: typical 1 day (10Ah 5V battery pack)

Tags: Unlimited – Tracked simultaneously at max refresh rate

Refresh Rate: up to 20 Hz for all the tags simultaneously

Network infrastructure (anchors): not needed

Central unit: not needed. Available for centralized tags’ monitoring and management (WiFi)

Sequitur InTracking
TDOA
In-Tracking-TDOA-big
Centralized TDOA

Position estimation: in central unit

Tag form factor: small personal tag with embedded battery

Tag energy efficiency:  ~ 900.000 position updates per battery (weeks/months, scales with refresh rate)

Tags: Unlimited – High tag density, scales with refresh rate

Refresh Rate: up to 20 Hz, scales with number of tags

Network infrastructure (anchors): Ethernet

Central unit: needed for position estimation. Possibility of coexistence of InGPS and InTracking tags

What we offer
Why Sequitur

Sequitur is based on proprietary UWB communication and tracking schemes exploiting IEEE 802.15.4a standard, which offer outstanding performance and robustness. They benefit of more than ten years of research and experience in localization systems. Our system is based on unique concepts of fully asynchronous and modular positioning architectures, providing the maximum of flexibility with respect to the user and environment needs.

 

Sequitur

Other solutions

Scalability

System based on a modular and asynchronous network, without the need of neither a master node nor any form of clustering/coordination. Any addition/removal of anchors can be easily managed on the basis of future changes of the environment or application.

Fixed networks of anchors requiring a-priori planning. Any change of the anchors’ architecture needs adaptation.

“Decentralized” architecture: navigation capability

Decentralized architectures (both TDOA and TWR) performing the estimation of the tag position in the tag itself, allowing fast interaction with autonomous systems (robots, drones, etc.). Position available at tag side with no external connections. Zero latency and outstanding robustness due to the lack of unreliable radio links.

Most of the UWB indoor positioning systems perform position calculation only on a central unit (server). Wireless connection necessary for navigation leads to latency and unreliability.

Robustness with respect to failures

Architecture based on asynchronous coordination among the anchors; the failure of any anchor or of any communication link does not compromise the localization of tags.

Failure of a master anchor compromises all the cluster of anchors connected to that master. Failure of the communication network between anchors and the central unit compromises the localization.

Localization Engine

Possibility of coexistence between powerful tags estimating their position, as done in standard GNSS receivers (InGPS) and low-complexity, small and battery-powered tags (InTracking) whose position is computed by a central server. Infinite number of tags localized simultaneously at the maximum refresh rate. No network necessary for InGPS (fully distributed).

Complex central unit estimating the position of all the tags. Reliable network connections are mandatory for operations. The positioning refresh rate always scales with the number of tags.

Network and synchronization

Not needed for InGPS. Only Ethernet for InTracking. No additional cables, no master nodes. Fast and easy installation and low-cost infrastructure.

Necessity of cable synchronization or master anchors for wireless synchronization. Presence of clusters of anchors. Complicated deployment, high cost and network planning mandatory.

Accuracy and reliability

Beyond state-of-the-art localization engine. Reliable locations reported. Automatic detection of outliers and out-of-service events. Robust and automatic reset of the localization engine. Automatic neighbor anchors’ discovery and seamless handover.

Clustered networks with scarce robustness in case of failure of anchors, network or  localization engine.

Applications