Nonlinear intermodulation distance determination system
US10712443B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 2019 |
| Grant date | Jul 14, 2020 |
| Priority date | — |
| Expiry date | Oct 24, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D1/101
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A distance determination system is disclosed. In various embodiments, the system includes a transmitter configured to transmit a first pulse at a first frequency and a second pulse at a second frequency; a receiver configured to receive audio signals; and a processor coupled to the receiver and configured to detect whether an intermodulation product of the first pulse and the second pulse is present and above a threshold amplitude in an audio signal received by the receiver; and determine, based at least in part on whether the intermodulation product of the first pulse and the second pulse is detected to be present and above a threshold amplitude, whether a distance to a surface is greater than a distance corresponding to the first pulse and the second pulse.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.