{
  "$type": "site.standard.document",
  "description": "A vertical deflection estimation device usable for inertial navigation includes: a gravity gradiometer, a known vertical deflection library part, a high frequency extraction part, and an estimation part. The gravity gradiometer measures a change in vertical deflection in accordance with positional…",
  "path": "/patents/1347457",
  "publishedAt": "2023-07-13T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01C21/165",
    "TOKYO INSTITUTE OF TECHNOLOGY"
  ],
  "textContent": "A vertical deflection estimation device usable for inertial navigation includes: a gravity gradiometer, a known vertical deflection library part, a high frequency extraction part, and an estimation part. The gravity gradiometer measures a change in vertical deflection in accordance with positional movement of a mobile body and outputs it as a measured vertical deflection. The known vertical deflection library part—obtains known information of vertical deflection on map as known vertical deflection. The high frequency extraction part extracts a high spatial frequency component of a change in the measured vertical deflection which is measured in accordance with the positional movement of the mobile body by the gravity gradiometer. The estimation part derives a change in an estimated vertical deflection by combining a change in the known vertical deflection on map in accordance with the positional movement of the mobile body using information of the known vertical deflection of the known vertical deflection library part and a change in the measured vertical deflection of the high spatial frequency component extracted by the high frequency extraction part.",
  "title": "VERTICAL DEFLECTION ESTIMATION DEVICE"
}