Navigation using range measurements to OFDM transmitters
US9261576B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2013 |
| Grant date | Feb 16, 2016 |
| Priority date | — |
| Expiry date | May 16, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S19/46
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A signal receiver receives a time-domain signal that includes a plurality of pilot tones at a plurality of corresponding frequencies. The time-domain signal is transmitted from a transmit location. The signal receiver extracts from the received time-domain signal pilot phase values corresponding to the pilot tones. The signal receiver computes a signal propagation time of the received time-domain signal by fitting an interpolation function to residual pilot phase values, corresponding to the extracted pilot phase values, and determines a slope of the interpolation function. The signal receiver computes a range between the transmit location and the signal receiver by multiplying the computed signal propagation time with the speed of light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.