'Unity indoor positioning system resources

I am looking to set up an AR app implemented on Unity, running in an interior space, with rather precise positioning. Ideally, this will be functional on most smartphones and tablets (hardware-wise) and hopefully (but not necessarily) as a web app.

I am drawing blanks, though, on finding the relevant packages, libraries, implementations or for that matter search terms; all I get on my searches is noise.

To the questions, then: What's the right technologies to do this? Where should I look for the assets to make it work? And mostly, how should I search for resources on the subject?

unity3dindoor-positioning-system


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