Our precise indoor positioning system – Marvelmind Indoor “GPS” – already has typical ±2cm accuracy, which is enough for 90% of real-world precise indoor positioning and navigation application. But some people ask for more… – “the highest possible”, “sub-cm level”, “mm-level”.
Let us discuss in more detail what can be done to achieve the highest possible level of accuracy from the existing indoor positioning system and the subsequent development points.
Metrology can be a pretty complex and rather impractical science. One asks a simple question: “How precise is the system?” and gets a very long answer that refers to the conditions, method of measurement, probability, and confidence … “OK… but what is the accuracy? And how do you measure?”
We don’t want you and us to engage in that discussion. It is somewhat scientific, lengthy, and impractical because it doesn’t give usable answers to basic questions.
Let’s do practical things that give answers to your engineering and commercial questions like:
First, check the videos on the right to see examples of our precise indoor positioning system’s current performance compared to UWB.
Another video – hints, and advice on the settings to achieve the sub-cm level of accuracy for the expense of latency – by employing the embedded into the Dashboard or the beacons themselves Realtime Player.
The last video is about the testing method, a lot of statistics, and results show that we fit nicely into the claimed ±2cm accuracy.
Also, remember that the accuracy of position measurements doesn’t depend on the location update rate. At the same time, if your system can tolerate more latency in the position measurements, it is possible to achieve higher accuracy of measurements.
Center of the beacon for transmission (TX):
Center of the beacon for reception (RX):
See more detail and graphics in the picture.
A similar approach is used with other beacons. See more about their geometry:
The indoor positioning system can automatically measure distances between the beacons, for example, between Super-Beacons or Industrial Super-Beacons – called dual-use beacons. They can transmit and receive ultrasound. By measuring distances to several beacons, building a table of distances, and employing trilateration
However, even they cannot know their height because it is a relative term.
See more detail and graphics on the picture.
Several factors have to be taken into account to increase the accuracy of the already precise indoor positioning system even further.
Do you need it?
Do you need to increase the accuracy? Of course, the higher, the better. But everything comes at the expense of a compromise or a sacrifice. Thus, before engaging, double-check that you need an even more accurate system and are ready for additional steps, efforts, and trade-offs.
Enable Realtime Player
Build submaps with proper geometry
Noise or wind