Method and apparatus for high-accuracy position location using search mode ranging techniques
US6876326B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 23, 2001 |
| Grant date | Apr 5, 2005 |
| Priority date | — |
| Expiry date | Dec 27, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S2205/002
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A high accuracy search and tracking system that uses a round-trip messaging scheme in which the time of arrive (TOA) of ranging signals is accurately determined to yield the range estimates between a target communications device and one or more search communications devices. Successive ranging estimates are used by a search device to home in upon the target device. The physical location pinpoint communications system can be used alone, or in combination with other location estimation systems that can be used initially, or throughout the search and tracking process to pinpoint the physical location of the target device. The search radio(s) transmits ranging signals to the target radio which responds by transmitting reply ranging signals. Upon reception of the reply ranging signal, the search radio determines the range to the reference radio from the signal propagation time. Errors in TOA estimates can be minimized using advanced processing techniques, if required.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.