{
  "$type": "site.standard.document",
  "coverImage": {
    "$type": "blob",
    "ref": {
      "$link": "bafkreihovbxnnjoiztr5rjuohpnbfsmyko33wrmonl7tj35s7aa3wxn63a"
    },
    "mimeType": "image/png",
    "size": 95529
  },
  "description": "The navigation filter (11) has a selectively tilting unit for calculating a kinematic state of a carrier and a covariance matrix, where the navigation filter restores values ??calculated by one of a convergence filter (21) e.g. particle filter or marginalised particle filter, and a tracking filter…",
  "path": "/patents/1006672",
  "publishedAt": "2011-12-28T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01C21/005",
    "THALES SA [FR]"
  ],
  "textContent": "The navigation filter (11) has a selectively tilting unit for calculating a kinematic state of a carrier and a covariance matrix, where the navigation filter restores values ??calculated by one of a convergence filter (21) e.g. particle filter or marginalised particle filter, and a tracking filter (22) e.g. extended Kalman filter or Unscented Kalman filter. The navigation filter restores the values based on the comparison of a quality index calculated from the covariance matrix restored by the navigation filter at one instant at a predetermined threshold value.",
  "title": "Navigation filter for navigation system by terrain matching."
}