{
  "$type": "site.standard.document",
  "description": "A displacement of a pedestrian is determined from his or her accelerations by detecting accelerations which are substantially non vertical, determining a characteristic feature in the detected accelerations correlated with a step frequency, determining the displacement on the basis of said…",
  "path": "/patents/1100730",
  "publishedAt": "2002-10-30T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01C21/166",
    "LADETTO QUENTIN [CH]"
  ],
  "textContent": "A displacement of a pedestrian is determined from his or her accelerations by detecting accelerations which are substantially non vertical, determining a characteristic feature in the detected accelerations correlated with a step frequency, determining the displacement on the basis of said determined characteristic. [0002] The acceleration data can be submitted to waveform analysis to determine an actualized time interval of an occurring feature, such a maximum values, from which it is determined whether the actualized time period falls within determined limit values. The currently detected characteristic feature is then determined as corresponding to a displacement step if the actualized time period falls within said determined limit value. [0003] By using non-vertical acceleration measurements, the invention can make it possible to distinguish between forward, backward, left and right stepping movements and take these into account for the navigation.",
  "title": "Pedestrian navigation method and apparatus operative in a dead reckoning mode"
}