{
  "$type": "site.standard.document",
  "description": "A signal acquisition section 19 acquires, for example, a vehicle velocity pulse signal, which is generated from a vehicle velocity sensor 8 in accordance with the movement of a vehicle that is a mobile body. A distance information acquisition section 20 acquires distance information concerning the…",
  "path": "/patents/1092261",
  "publishedAt": "2003-10-29T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01C22/02",
    "PIONEER CORP [JP]"
  ],
  "textContent": "A signal acquisition section 19 acquires, for example, a vehicle velocity pulse signal, which is generated from a vehicle velocity sensor 8 in accordance with the movement of a vehicle that is a mobile body. A distance information acquisition section 20 acquires distance information concerning the movement distance of the vehicle from a GPS receiver 2. A distance factor computing section 21 computes a distance factor value based on the acquired vehicle velocity pulse signal and distance information. A change detection section 23 then compares this computed distance factor value and a distance factor reference value stored in a reference value storage section 30 to detect a continuous change of the distance factor value. That is, change detection section 23 detects a change of tire outer diameter due to a change of the pneumatic pressure of the vehicle's tire or tire exchange, etc. When the change of tire outer diameter is detected by change detection section 23, a distance factor correction section 26 corrects the distance factor reference value speedily and appropriately.",
  "title": "Method and apparatus for correcting the distance factor of a vehicle distance sensor using GPS"
}