Low frequency modulated chirp minimum distance measurement
US10976423B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 11, 2018 |
| Grant date | Apr 13, 2021 |
| Priority date | — |
| Expiry date | Jan 17, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S15/931
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In one form, an acoustic distance measuring circuit includes a transmitter amplifier, an acoustic transducer, and a sensing circuit. The sensing circuit includes an input adapted to be coupled to the acoustic transducer, a first correlation output for providing a chirp tail correlation signal, and a second output for providing a full chirp correlation signal. The sensing circuit provides the chirp tail correlation signal in response to correlating a chirp tail signal pattern with a received signal, and provides a full chirp correlation signal in response to correlating a full chirp signal pattern with the received signal. Further, the acoustic distance measuring circuit includes a controller adapted to be coupled to the sensing circuit that has a first input for receiving the chirp tail correlation signal and the full chirp correlation signal for determining a short range time of flight signal and a long range time of flight signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.