{
  "$type": "site.standard.document",
  "description": "A remote keyless entry system includes an in-vehicle device including an in-vehicle device controller, an in-vehicle device transmitter that transmits an in-vehicle device signal, and an in-vehicle device receiver that receives a portable device signal, and a portable device including a portable…",
  "path": "/patents/1268906",
  "publishedAt": "2020-08-06T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60R25/2072",
    "ALPS ALPINE CO., LTD."
  ],
  "textContent": "A remote keyless entry system includes an in-vehicle device including an in-vehicle device controller, an in-vehicle device transmitter that transmits an in-vehicle device signal, and an in-vehicle device receiver that receives a portable device signal, and a portable device including a portable device controller, an acceleration sensor, a portable device receiver, and a portable device transmitter, wherein the portable device controller calculates a distance from the in-vehicle device to the portable device based on the in-vehicle device signal, calculates a first travel distance based on acceleration, and causes the portable device transmitter to transmit the portable device signal including at least the distance, the in-vehicle device controller receives the portable device signal multiple times and calculates a second travel distance based on distances included in received portable device signals, and whether a relay attack is performed is determined based on the first travel distance and the second travel distance.",
  "title": "REMOTE KEYLESS ENTRY SYSTEM"
}