{
  "$type": "site.standard.document",
  "description": "A navigation system includes an inertial navigation unit and a Kalman filter that generates corrective feedback for use by the inertial navigation unit, as a function of at least one of GPS/DGPS information, sensor information, user input, terrain correlation information, signal-of-opportunity…",
  "path": "/patents/972363",
  "publishedAt": "2014-07-23T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01C21/005",
    "HONEYWELL INT INC [US]"
  ],
  "textContent": "A navigation system includes an inertial navigation unit and a Kalman filter that generates corrective feedback for use by the inertial navigation unit, as a function of at least one of GPS/DGPS information, sensor information, user input, terrain correlation information, signal-of-opportunity information, and/or position information output by a motion classifier.",
  "title": "Personal navigation using terrain-correlation and/or signal-of-opportunity information"
}