Ultrasonic beacon tracking
US11543486B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2021 |
| Grant date | Jan 3, 2023 |
| Priority date | — |
| Expiry date | Jul 5, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/878
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Time of flight between two or more ultrasonic transceivers is measured using known delays. First and second transceivers are duty cycled, each having a respective receive period that is less than a measurement period during which the transceivers are configured to receive transmissions. An ultrasonic trigger pulse is transmitted by the first transceiver. The second transceiver, upon receiving the trigger pulse, transmits an ultrasonic response pulse after a first predefined delay time that is known to the first transceiver and greater than the receive period of the second transceiver. Subsequently, the first transceiver receives the ultrasonic response pulse and determines a receive time. The first transceiver determines the distance between the first transceiver and the second transceiver from a speed of sound, an elapsed time between the time of transmission of the trigger pulse and the receive time, and the first predetermine delay time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.