Radio frequency head tracker
US10390581B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 29, 2019 |
| Grant date | Aug 27, 2019 |
| Priority date | — |
| Expiry date | Jan 29, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q21/29
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A head-tracking system utilizing radio frequency (RF) transmitters and receivers. RF fiducials are disposed on a helmet and a constellation of receivers receives one or more RF carriers with defined pulse frequencies. Measured time delays are used to produce a head pose. Alternatively, phase shifting is measured to determine the location of each RF fiducial within a single wavelength. In some embodiments, multiple frequency ranges may be used to define a coarse location via phase shifting within a long wavelength RF carrier and a fine location via phase shifting within a short wavelength RF carrier. In a further aspect, polarization and amplitude measurements in conjunction with a known peak RF transmitter amplitude may be used to determine a receiver's relative position with respect to the RF transmitter. GPS location methodologies, spread spectrum frequency hopping, and encryption may also be utilized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.