About the algorithms

Hi !
I built up indoor position app and proximity app following estimote’s direction and it works well.
I just want to know what kind of algorithms do you use to calibrate the position??
I don’t want to know specifically. just the name of algorithms estimote use in indoor location beacon and Proximity beacon.
The reason why I want to know what kind of algorithms does estimote use is that on my research process tracking indoor position of people, I should introduce what kind of device i utilize and its characteristics (such as algoritms, accuracy… to explain why i select estimote’s beacon)