{
  "$type": "site.standard.document",
  "description": "An access system for a vehicle is provided and includes antennas and an access module. The antennas are configured to each receive a signal transmitted from a portable access device to the vehicle. One of the antennas is a circular polarized antenna. The access module is configured to: downconvert…",
  "path": "/patents/1266904",
  "publishedAt": "2020-07-09T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G07C9/00309",
    "DENSO International America, Inc."
  ],
  "textContent": "An access system for a vehicle is provided and includes antennas and an access module. The antennas are configured to each receive a signal transmitted from a portable access device to the vehicle. One of the antennas is a circular polarized antenna. The access module is configured to: downconvert the received signal to generate an in-phase signal and a quadrature phase signal; execute a music algorithm to determine angles of arrival of the received signal as received at the antennas; determine a distance between the portable access device and the vehicle based on the angles of arrival; and permit access to the vehicle based on the distance.",
  "title": "PASSIVE ENTRY/PASSIVE START SYSTEMS IMPLEMENTING MUSIC ALGORITHM BASED ANGLE OF ARRIVAL DETERMINATIONS FOR SIGNALS RECEIVED VIA CIRCULAR POLARIZED ANTENNAS"
}