Low-cost tracking system
US9316731B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 2012 |
| Grant date | Apr 19, 2016 |
| Priority date | — |
| Expiry date | Aug 3, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S7/52004
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of tracking a second electronic device with respect to a first electronic device is disclosed. The method includes transmitting a first waveform of a first frequency along a first fixed path associated with the first device. A second waveform having a frequency based on the first frequency is wirelessly transmitted from the first device to the second device along a first wireless path. The second waveform is wirelessly transmitted from the second device to the first device along a second wireless path. The first and second waveforms are received at the phase comparator circuit. A first phase relationship of the received first waveform is then compared to a second phase relationship of the received re-transmitted waveform. A coordinate of the second device is determined with respect to a reference coordinate based on the comparing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.