With technology advances like IoT and 5G telecommunications, there is now a rapidly growing demand not only for location information, but also advanced time data and time synchronization.
iPNT acts as an indoor GPS to provide location and time data both indoors and outdoors in a seamless manner.
After many years of research, in 2018, we succeesfully develop iPNT, which allows the use of GNSS for indoor positioning and high-accuracy time synchronization.
One of the current technologies for high-accuracy indoor synchronization is IEEE1588 PTP (Precision Time Protocol).PTP pushes time packets over widely available ethernet cables used in LANs to achieve synchronization within 1 microsecond. However, congestion within the local network can cause packet latency and instability, as well as packet loss, making it difficult for such a system to steadly provide high-accuracy synchronization.
The system uses packet switching to compensate for latency, meaning the PTP devices that can be attached to a GMC master system are necessarily limited. Such a system poses many problems, such as not being suitable for WAN environments where latency fluctuates heavily.
iPNT minimizes degradation of signal from external factors like the above in order to offer stable, accurate time and synchronous signals.
Here we describe the structure of the system, how synchronization and positioning are performed, and how the system is utilized.
We aim to make this a core part of the basic infrastructure used in a wide range of sectors, diverse locations and while IoT, automation, and AI technology advance furtherly.
The iPNT system consists of the D1 (installed on the rooftop), D2 (indoor), and D3 (the last piece in the chain, the iPNT transmitter).
The iPNT interface and messaging specifications have been made public and standardized by The Association of Indoor Messaging Service (TAIMS).