State detection

A non-transitory computer-readable storage medium comprising instructions which, when executed by a processor of a device cause the processor to perform a method of determining a state of a person in an environment, the method comprising:

• receiving an output of an active reflected wave detector;
• based on the output of the active reflected wave detector, classifying a state of the person as being in any one of:
• a first standing state, wherein the first standing state comprises standing without oscillating about a position;
• or
• a second standing state, wherein the second standing state comprises standing with oscillating about a position;
• wherein said classifying uses measurements of reflections associated with the person conveyed in the output of the active reflected wave detector, and said classifying is based at least on:
• a plurality of velocity magnitude measurements of the person corresponding to different times, each of said velocity magnitude measurements determined using the reflections associated with the person conveyed in the output of the active reflected wave detector;
• and
• at least one of:
• (i) a spatial distribution of the measurements of the reflections associated with the person conveyed in the output of the active reflected wave detector;
• or
• (ii) a height metric associated with at least one reflection from the person conveyed in the output of the active reflected wave detector.

A device for determining a state of a person in an environment, the device comprising a processor configured to:

• receive an output of an active reflected wave detector;
• based on the output of the active reflected wave detector, classify a state of the person as being in either:
• a first standing state, wherein the first standing state comprises standing without oscillating about a position;
• or
• a second standing state, wherein the second standing state comprises standing with oscillating about a position;
• wherein said classification uses measurements of reflections associated with the person conveyed in the output of the active reflected wave detector, and said classification is based at least on:
• a plurality of velocity magnitude measurements of the person corresponding to different times, each of said plurality of velocity magnitude measurements determined using the reflections associated with the person conveyed in the output of the active reflected wave detector;
• and
• at least one of:
• (i) a spatial distribution of the measurements of the reflections associated with the person conveyed in the output of the active reflected wave detector;
• or
• (ii) a height metric associated with at least one reflection from the person conveyed in the output of the active reflected wave detector.