Emitter locating using time-difference-of-arrival (TDOA) techniques
US7561105B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2005 |
| Grant date | Jul 14, 2009 |
| Priority date | — |
| Expiry date | Jun 7, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S5/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides a method of selecting receiving pairs from a set of at least three receivers that may be used to localize an emitter. This involves identifying the set of at least three receivers to be used to localize the emitter. An isochron may be developed for each receiver pair wherein each isochron has a finite width. The intersection of two isochrons creates an uncertainty parallelogram. When the intersection of two isochrones is substantially orthogonal or subtends a relatively large angle, uncertainty based on the intersection angle is minimized and uncertainty becomes primarily a function of isochron width. To determine acceptable or best receiver pairs to be used, the intersections of each isochron pair may be analyzed. The uncertainty parallelograms and intersection angles are compared for each pair of intersecting isochrons. Then, receiver pairs that produced the isochrons that result in a reduced or compact uncertainty parallelogram may be selected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.