Determining a time of arrival of a sent signal
US6784827B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 2002 |
| Grant date | Aug 31, 2004 |
| Priority date | — |
| Expiry date | Dec 20, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides an apparatus, method, and system for determining a time of arrival (TOA) and time differences of arrival (TDOA) of a transmitted signal {S} receivable at different locations of known spatial coordinates. The system comprises a first transmitter 10 with a respective antenna feed point positioned at an a priori unknown location P and emitting a first signal {S}. The system includes furthermore a set of transceivers or transponder units 20, 30 comprising first receivers 22, 32 for receiving first signals {S} by means of respective antennas with feed points located at known locations Ln. Such system also comprises second transmitters 26, 36 emitting respective derived second signals {{tilde over (S)}n} after known and scheduled respective time intervals &dgr;n as measurable between the feed points of said respective first receiving antennas located at known locations Ln and respective second transmitting antenna located at locations L′n. A set of second receivers 42, 52 receives respective second signals {{tilde over (S)}n} after known respective time intervals &tgr;n measured between the feed points of the second transmitting antennas and feed poin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.