  Digital maps will revolutionize our experience of perceiving and navigating
indoor environments. While today we rely only on the representation of the
outdoors, the mapping of indoors is mainly a part of the traditional SLAM
problem where robots discover the surrounding and perform self-localization.
Nonetheless, robot deployment prevents from a large diffusion and fast mapping
of indoors and, further, they are usually equipped with laser and vision
technology that fail in scarce visibility conditions. To this end, a possible
solution is to turn future personal devices into personal radars as a milestone
towards the automatic generation of indoor maps using massive array technology
at millimeter-waves, already in place for communications. In this
application-oriented paper, we will describe the main achievements attained so
far to develop the personal radar concept, using ad-hoc collected experimental
data, and by discussing possible future directions of investigation.
