{
  "$type": "site.standard.document",
  "description": "The drone has a telemetric sensor (154) that is ready to consider a distance relative to separation of the drone from a surface from echoes returning from ultrasonic impulses emitted by the drone. An altitude determination unit (134) includes a barometric sensor (156), and an estimator (152). An…",
  "path": "/patents/983869",
  "publishedAt": "2013-10-02T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "A63H27/12",
    "PARROT [FR]"
  ],
  "textContent": "The drone has a telemetric sensor (154) that is ready to consider a distance relative to separation of the drone from a surface from echoes returning from ultrasonic impulses emitted by the drone. An altitude determination unit (134) includes a barometric sensor (156), and an estimator (152). An obstacle detecting unit analyzes the echoes to deduce presence of configuration of an obstacle and applies a corrective action to compensate the effect of the obstacle at the relative distance estimated by the telemetric sensor.",
  "title": "Altitude estimator for rotary-wing drone with multiple rotors"
}